Publications
| Title | Abstract | Year(sorted ascending) Filter | PMID Filter |
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| simultaneous preconcentration of copper and cadmium by dispersive liquid-liquid microextraction using n,n'-bis (2-hydroxy-5-bromo-benzyl)1,2 diaminopropane and their determination by flame atomic absorption spectrometry. | in the present study, the simultaneous preconcentration of copper and cadmium based on dispersive liquid-liquid microextraction as a prior step to their determination using flame atomic absorption spectrometry was developed. carbon tetrachloride and n,n'-bis(2-hydroxy-5-bromo-benzyl)1,2 diaminopropane were used as the extraction solvent and chelating ligand, respectively. some parameters that influence the extraction efficiency-e.g., sample ph, volume of extraction solvent (carbon tetrachloride) ... | 2016 | 27458174 |
| ion imprinted polymer for preconcentration and determination of ultra-trace cadmium, employing flow injection analysis with thermo spray flame furnace atomic absorption spectrometry. | this work proposes a preconcentration method using an ion imprinted polymer (iip) for determination of cadmium, in several samples, employing a mini-column filled with the polymer coupled into a flow injection analysis system with detection by thermospray flame furnace atomic absorption spectrometry (fia-ts-ff-aas). the polymer was synthesized via bulk using methacrylic acid and vinylimidazole as a functional monomer. for the fia system initial assessment, the variables: ph, eluent concentration ... | 2016 | 27449370 |
| therapeutic potential of green tea on risk factors for type 2 diabetes in obese adults - a review. | green tea has been associated with positive effects in the treatment of obesity and other associated comorbidities such as type 2 diabetes. these benefits are thought to be related to the anti-inflammatory and antioxidant effects of green tea and to the reduction in body fat percentage exhibited by its bioactive compounds. the predominant active compounds in green tea are flavonoid monomers known as catechins, in particular epigallocatechin-3-gallate, which is the most abundant and most effectiv ... | 2016 | 27443447 |
| simple isocratic method for simultaneous determination of caffeine and catechins in tea products by hplc. | tea is a popular beverage almost all over the world. many studies show that tea consumption is closely associated with positive health impact. most of the hplc methods used for the determination of tea constituents include gradient elution systems which involve expensive instrumentation. the objective of this study was to develop a simple, rapid precise and low cost hplc method for the separation and quantification of catechins and caffeine in tea (camellia sinensis). the method utilizes a pheny ... | 2016 | 27429880 |
| a tandem mass spectrometry method based on selected ions detects low-abundance phenolics in black tea - theatridimensins as products of the oxidative cascade. | mixtures of phenolics are widespread in plant-derived food products, for instance black tea. detailed compositional analysis of phenolics present is important for quality control. characterization of low-abundance compounds often requires extensive purification; hence, the need for rapid screening methods to annotate compounds in complex mixtures without extensive sample preparation. opportunities of ultra-high performance liquid chromatography/tandem mass spectrometry (uhplc/ms) as tool in a ra ... | 2016 | 27426456 |
| food habits, lifestyle factors, and risk of prostate cancer in central argentina: a case control study involving self-motivated health behavior modifications after diagnosis. | cancer is the second most important non-communicable disease worldwide and disproportionately impacts low- to middle-income countries. diet in combination with other lifestyle habits seems to modify the risk for some cancers but little is known about south americans. food habits of argentinean men pre- and post-diagnosis of prostate cancer (n = 326) were assessed along with other lifestyle factors. we studied whether any of the behaviors and risk factors for prostate cancer were found in men wit ... | 2016 | 27409631 |
| tomato-based randomized controlled trial in prostate cancer patients: effect on psa. | the effect of lycopene-containing foods in prostate cancer development remains undetermined. we tested whether a lycopene-rich tomato intervention could reduce the levels of prostate specific antigen (psa) in prostate cancer patients. | 2016 | 27406859 |
| interfering effect of black tea consumption on diagnosis of pancreatic cancer by ca 19-9. | the study aims to determine the possible effects of black tea consumption on the level of ca 19-9 antigen in the human body. | 2016 | 27402465 |
| [fast detection of camellia sinensis growth process and tea quality informations with spectral technology: a review]. | the research achievements and trends of spectral technology in fast detection of camellia sinensis growth process information and tea quality information were being reviewed. spectral technology is a kind of fast, nondestructive, efficient detection technology, which mainly contains infrared spectroscopy, fluorescence spectroscopy, raman spectroscopy and mass spectroscopy. the rapid detection of camellia sinensis growth process information and tea quality is helpful to realize the informatizatio ... | 2016 | 27400523 |
| an efficient identification strategy of clonal tea cultivars using long-core motif ssr markers. | microsatellites, or simple sequence repeats (ssrs), especially those with long-core motifs (tri-, tetra-, penta-, and hexa-nucleotide) represent an excellent tool for dna fingerprinting. ssrs with long-core motifs are preferred since neighbor alleles are more easily separated and identified from each other, which render the interpretation of electropherograms and the true alleles more reliable. in the present work, with the purpose of characterizing a set of core ssr markers with long-core motif ... | 2016 | 27504250 |
| factors affecting tea consumption pattern in an urban society in isfahan, iran. | to determine the tea consumption pattern in an urban society in isfahan. | 2016 | 27500166 |
| catechins profile, caffeine content and antioxidant activity of camellia sinensis teas commercialized in romania. | catechins profile, caffeine content and antioxidant activity of different green tea and white tea samples commercialized on the romanian market were investigated. | 2016 | 27483735 |
| suppressive effects of tea catechins on breast cancer. | tea leaf (camellia sinensis) is rich in catechins, which endow tea with various health benefits. there are more than ten catechin compounds in tea, among which epigallocatechingallate (egcg) is the most abundant. epidemiological studies on the association between tea consumption and the risk of breast cancer were summarized, and the inhibitory effects of tea catechins on breast cancer, with egcg as a representative compound, were reviewed in the present paper. the controversial results regarding ... | 2016 | 27483305 |
| theaflavins suppress tumor growth and metastasis via the blockage of the stat3 pathway in hepatocellular carcinoma. | theaflavins, the major black tea polyphenols, have been reported to exhibit promising antitumor activities in several human cancers. however, the role of theaflavins in hepatocellular carcinoma (hcc) is still unknown. in this study, we found that theaflavins could significantly inhibit proliferation, migration, and invasion, and induce apoptosis in hcc cells in vitro. furthermore, we found that theaflavins inhibited the growth and metastasis of hcc in an orthotopic model and a lung metastasis mo ... | 2016 | 27478384 |
| green tea (camellia sinensis): chemistry and oral health. | green tea is a widely consumed beverage worldwide. numerous studies have suggested about the beneficial effects of green tea on oral conditions such as dental caries, periodontal diseases and halitosis. however, to date there have not been many review articles published that focus on beneficial effects of green tea on oral disease. the aim of this publication is to summarize the research conducted on the effects of green tea on oral cavity. green tea might help reduce the bacterial activity in t ... | 2016 | 27386001 |
| annotation of different dehydrocatechin oligomers by ms/ms and their occurrence in black tea. | dehydrocatechins (dhc's), oligomeric oxidation products of (epi)catechins, were formed in model incubations of epicatechin with mushroom tyrosinase. dhc oligomers up to tetramers were detected by reversed-phase ultrahigh-performance liquid chromatography mass spectrometry (rp-uhplc-ms) analysis. measurements with matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (maldi-tof-ms) showed formation of oligomers up to at least 15 catechin subunits. isomeric dhc's were obtain ... | 2016 | 27380714 |
| developmental changes in carbon and nitrogen metabolism affect tea quality in different leaf position. | leaf position represents a specific developmental stage that influences both photosynthesis and respiration. however, the precise relationships between photosynthesis and respiration in different leaf position that affect tea quality are largely unknown. here, we show that the effective quantum yield of photosystem ii [φpsⅱ] as well as total chlorophyll concentration (tchl) of tea leaves increased gradually with leaf maturity. moreover, respiration rate (rr) together with total nitrogen concentr ... | 2016 | 27380366 |
| new biofunctional effects of the flower buds of camellia sinensis and its bioactive acylated oleanane-type triterpene oligoglycosides. | we review the biofunctional effects of the flower buds of camellia sinensis and c. sinensis var. assamica, such as antihyperlipidemic, antihyperglycemic, antiobesity, and gastroprotective effects in vivo, and antiallergic, pancreatic lipase inhibitory, and amyloid β (aβ) aggregation inhibitory activities in vitro. although the biofunctional effects of tea leaves have been extensively studied, less attention has been given to those of the flowers and seeds of the tea plant. our studies focused on ... | 2016 | 27380283 |
| variations of rhizosphere bacterial communities in tea (camellia sinensis l.) continuous cropping soil by high-throughput pyrosequencing approach. | the goal was to investigate the dynamics of soil bacterial community in the chronosequence tea orchards. | 2016 | 27377624 |
| the occurrence and distribution of tuckerella japonica (acari: tuckerellidae) on tea bushes, camellia sinensis and c. assamica, in alabama, georgia and south carolina, usa. | adults, immatures and eggs of tuckerella japonica (ehara) were collected from unknown clones or varieties of camellia sinensis (l.) o. kuntze tea bushes in the clemson university farm, coastal research and education center, charleston, south carolina; from assam hybrids in the caw caw nature preserve in ravenel, sc; from c. sinensis and c. assamica (masters) in the charleston tea plantation on wadmalaw island, sc; c. sinensis in the fairhope tea plantation in fairhope, alabama; and from c. sinen ... | 2016 | 27294360 |
| antioxidative potential, nutritional value and sensory profiles of confectionery fortified with green and yellow tea leaves (camellia sinensis). | this paper presents a study on development of functional food products containing green and yellow tea leaves. the results indicated that green and yellow tea are significant tools in the creation of the nutritional value, antioxidative potential and stability of the lipid fraction of cookies. tea-fortified cookies showed considerably higher contents of dietary fiber, especially hemicellulose and insoluble fractions, and were characterized by significantly higher antioxidant potential associated ... | 2016 | 27283654 |
| small rna and degradome profiling reveals important roles for micrornas and their targets in tea plant response to drought stress. | tea (camellia sinensis) is a popular beverage worldwide. drought stress (ds) is a major constraint on the growth, yield and quality of tea plants. micrornas (mirnas) play important roles in plant responses to ds. we constructed eight small rna libraries from the drought-tolerant 'ningzhou 2' (nz2) and drought-susceptible 'zhuyeqi' (zyq) cultivars during four stages [control (ck), the fourth day of ds, the eighth day of ds and after recovery (rc)]. a total of 268 conserved and 62 novel mirnas wer ... | 2016 | 27282332 |
| oolong tea made from tea plants from different locations in yunnan and fujian, china showed similar aroma but different taste characteristics. | consistent aroma characteristics are important for tea products. however, understanding the formation of tea aroma flavor and correspondingly proposing applicable protocols to control tea quality and consistency remain major challenges. oolong tea is one of the most popular teas with a distinct flavor. generally, oolong tea is processed with the leaves of tea trees belonging to different subspecies and grown in significantly different regions. in this study, yunnan and fujian oolong teas, green ... | 2016 | 27247873 |
| selection and verification of candidate reference genes for mature microrna expression by quantitative rt-pcr in the tea plant (camellia sinensis). | quantitative reverse transcription-polymerase chain reaction (qrt-pcr) is a rapid and sensitive method for analyzing microrna (mirna) expression. however, accurate qrt-pcr results depend on the selection of reliable reference genes as internal positive controls. to date, few studies have identified reliable reference genes for differential expression analysis of mirnas among tissues, and among experimental conditions in plants. in this study, three mirnas and four non-coding small rnas (ncrna) w ... | 2016 | 27240406 |
| association between dietary intake and bone mineral density in japanese postmenopausal women: the yokogoshi cohort study. | diet and food intake play an important role in the development of osteoporosis. however, apart from calcium and vitamin d, how nutrients affect bone status is not fully understood. the purpose of this study was to determine cross-sectional and longitudinal associations between dietary intake and bone mineral density (bmd) in japanese postmenopausal women. this 5-year cohort study included 600 community-dwelling women aged 55-74 years at baseline in 2005. information on demographics, nutrition, a ... | 2016 | 27238552 |
| theaflavin synthesized in a selective, domino-type, one-pot enzymatic biotransformation method with camellia sinensis cell culture inhibits weight gain and fat accumulation to high-fat diet-induced obese mice. | the polyphenolic compound theaflavin, which is the main red pigment present in black tea, is reported to elicit various physiological effects. because of the extremely low concentration of theaflavin present in black tea, its extraction from black tea leaves in quantities sufficient for use in medical studies has been difficult. we have developed a simple, inexpensive, selective, domino-type, one-pot enzymatic biotransformation method for the synthesis of theaflavin that is suitable for use in m ... | 2016 | 27237789 |
| anti-cancer effects of green tea by either anti- or pro- oxidative mechanisms. | tea derived from the leaves and buds of camellia sinensis (theaceae) is consumed worldwide. green tea contains various components with specific health-promoting effects, and is believed to exert protective effects against diseases including cancer, diabetes and hepatitis, as well as obesity. of the various tea components, the polyphenol catechins have been the subject of extensive investigation and among the catechins, (-)-epigallocatechin gallate has the strongest bioactivity in most cases. our ... | 2016 | 27221834 |
| the effect of different beverages on the color and translucency of flowable composites. | this study examined the changes in color and translucency of flowable composites after immersion in different beverages. thirty composite samples were prepared from four flowable composites (g-aenial universal flo, filtek ultimate, esthelite flow quick, and clearfil majesty es flow) and a microhybrid composite (filtek z-250) and stored in distilled water at 37°c for 24 h. the samples were randomly divided into seven groups and then immersed in different beverages (red bull, coffee, black tea, pe ... | 2016 | 27220904 |
| indications for three independent domestication events for the tea plant (camellia sinensis (l.) o. kuntze) and new insights into the origin of tea germplasm in china and india revealed by nuclear microsatellites. | tea is the world's most popular non-alcoholic beverage. china and india are known to be the largest tea producing countries and recognized as the centers for the domestication of the tea plant (camellia sinensis (l.) o. kuntze). however, molecular studies on the origin, domestication and relationships of the main teas, china type, assam type and cambod type are lacking. | 2016 | 27218820 |
| traditional therapies used to manage diabetes and related complications in mauritius: a comparative ethnoreligious study. | religious communities from mauritius still rely on traditional therapies (tt) for primary healthcare. nonetheless, there is still a dearth of scientific information on tt used by the different religious groups to manage diabetes and related complications (drc). this study aimed to gather ethnomedicinal knowledge on tt used by the different religious groups against drc. diabetic patients (n = 95) and traditional healers (n = 5) were interviewed. fifty-two plant species belonging to 33 families an ... | 2016 | 27200100 |
| nutrition transition in rural tanzania and kenya. | all three types of malnutrition - underweight, overweight and micronutrient deficiency - are experienced in countries undergoing a nutrition transition, and they can occur in parallel in one community or even one household. to combat this triple burden of malnutrition, a combination of different strategies will be necessary, including a focus on food-based strategies that promote the consumption of a wide range of foods across nutritionally distinct food groups. in addition to a literature revie ... | 2016 | 27198465 |
| evaluation and quantitative analysis of different growth periods of herb-arbor intercropping systems using hplc and uv-vis methods coupled with chemometrics. | as a result of the pressure from population explosion, agricultural land resources require further protecting and rationally utilizing. intercropping technique has been widely applied for agricultural production to save cultivated area, improve crop quality, and promote agriculture economy. in this study, we employed high-performance liquid chromatography (hplc) and ultraviolet-visible spectroscopy (uv-vis) combined with chemometrics for determination and qualitative evaluation of several kinds ... | 2016 | 27193013 |
| effect of catechins on fattening performance, meat quality, some antioxidant and blood parameters and fattening costs in japanese quail (coturnix coturnix japonica). | the aim of this study was to investigate the effect of dietary supplementation of green tea (camellia sinensis) catechins in quail (coturnix coturnix japonica). quail were fed with a basal diet, and the treatment groups were fed on the basal diet with 1.25 or 2.50 g/kg catechin supplementation for 30 d. fattening performance and meat quality of the quail were estimated. serum total antioxidant status (tas), plasma and liver malondialdehyde (mda) and some serum biochemical parameters were measure ... | 2016 | 27186659 |
| transcriptome analysis reveals self-incompatibility in the tea plant (camellia sinensis) might be under gametophytic control. | self-incompatibility (si) is under genetic control and prevents inbreeding depression in angiosperms. si mechanisms are quite complicated and still poorly understood in many plants. tea (camellia sinensis l.) belonging to the family of theaceae, exhibits high levels of si and high heterozygosity. uncovering the molecular basis of si of the tea plant may enhance breeding and simplify genomics research for the whole family. | 2016 | 27183979 |
| impact of flavonoid-rich black tea and beetroot juice on postprandial peripheral vascular resistance and glucose homeostasis in obese, insulin-resistant men: a randomized controlled trial. | insulin-stimulated muscle blood flow facilitates plasma glucose disposal after a meal, a mechanism that is impaired in obese, insulin-resistant volunteers. nitrate- or flavonoid-rich products, through their proposed effects on nitric oxide, may improve postprandial blood flow and, subsequently, glucose disposal. to investigate whether a single dose of nitrate-rich beetroot juice or flavonoid-rich black tea lowers postprandial muscle vascular resistance in obese volunteers and alters postprandial ... | 2016 | 27182277 |
| magnetic effervescent tablet-assisted ionic liquid dispersive liquid-liquid microextraction of selenium for speciation in foods and beverages. | a novel, simple and rapid method based on magnetic effervescent tablet-assisted ionic liquid dispersive liquid-liquid microextraction (mea-il-dllme) followed by graphite furnace atomic absorption spectrometry (gfaas) determination was established for the speciation of selenium in various food and beverage samples. in the procedure, a special magnetic effervescent tablet containing co2 sources (sodium carbonate and sodium dihydrogenphosphate), ionic liquids and fe3o4 magnetic nanoparticles (mnps) ... | 2016 | 27181611 |
| critical factors determining fluoride concentration in tea leaves produced from anhui province, china. | this study investigated the fluoride present in tea plants (camellia sinensis (l.) o. kuntze) and its relationship to soils, varieties, seasons and tea leaf maturity. the study also explored how different manufacturing processes affect the leaching of fluoride into tea beverages. the fluoride concentration in the tea leaves was significantly correlate to the concentration of water-soluble fluoride in the soil. different tea varieties accumulated different levels of fluoride, with varieties, anji ... | 2016 | 27162130 |
| black tea polyphenols and polysaccharides improve body composition, increase fecal fatty acid, and regulate fat metabolism in high-fat diet-induced obese rats. | with the current changes in diet and living habits, obesity has become a global health problem. thus, the weight-reducing function of tea has attracted considerable attention. this study investigated the anti-obesity effect and the mechanism of black tea (bt) polyphenols and polysaccharides in male sprague-dawley rats. the bt polyphenols and polysaccharides reduced the body weight, lee's index, visceral fat weight, and fat cell size but improved the biochemical profile and increased the fecal fa ... | 2016 | 27161951 |
| switching to instant black coffee modulates sodium selenite-induced cataract in rats. | the influence of daily consumption of some common beverages on the development of cataract in rats was investigated. total phenol content was determined in the beverages and an oral standardized dose of total phenols from each beverage was given to the treated rats. weaned male albino rats were used and divided into five groups (n=7). rats were fed ain 93g and administered the standardized dose of instant coffee, black tea and hibiscus beverages for 30 days. on day 14 all rats were injected with ... | 2016 | 27158251 |
| risk assessment of mineral and heavy metal content of selected tea products from the ghanaian market. | food consumption is the most likely route of human exposure to metals. tea (camellia sinensis l.) is among the most widely consumed non-alcoholic beverages. concentrations of heavy metals and minerals in tea from 15 different brands in kumasi, ghana were measured to assess the health risk associated with their consumption. the mineral and metal contents (fe, cu, zn, pb, as, cd) were analyzed using atomic absorption spectrophotometer (z-8100 polarized zeeman). the results revealed that the mean c ... | 2016 | 27154053 |
| combined cytological and transcriptomic analysis reveals a nitric oxide signaling pathway involved in cold-inhibited camellia sinensis pollen tube growth. | nitric oxide (no) as a signaling molecule plays crucial roles in many abiotic stresses in plant development processes, including pollen tube growth. here, the signaling networks dominated by no during cold stress that inhibited camellia sinensis pollen tube growth are investigated in vitro. cytological analysis show that cold-induced no is involved in the inhibition of pollen tube growth along with disruption of the cytoplasmic ca(2+) gradient, increase in ros content, acidification of cytoplasm ... | 2016 | 27148289 |
| the impact of theaflavins on systemic-and microcirculation alterations: the murine and randomized feasibility trials. | theaflavins are polyphenols found in black tea; their physiological activities were not well investigated. the present study in rats evaluated the influence of theaflavins on circulation. in addition, an intervention pilot study examined the influence of a theaflavin drink on postprandial hemodynamic change. in an animal study, a single oral dose of theaflavin rich fraction (tf, 10mg/kg) caused transient increase in mean blood pressure (mbp) and heart rate (hr). tf also elevated cremastric blood ... | 2016 | 27142743 |
| swapdt: a method for short-time withering assessment of probability for drought tolerance in camellia sinensis validated by targeted metabolomics. | climate change is causing droughts affecting crop production on a global scale. classical breeding and selection strategies for drought-tolerant cultivars will help prevent crop losses. plant breeders, for all crops, need a simple and reliable method to identify drought-tolerant cultivars, but such a method is missing. plant metabolism is often disrupted by abiotic stress conditions. to survive drought, plants reconfigure their metabolic pathways. studies have documented the importance of metabo ... | 2016 | 27137993 |
| anticariogenic activity of black tea - an invivo study. | teas is known for its anticariogenic properties and various mechanisms have been invoked to explain this effect. one such proposed mechanism is inhibition of salivary alpha amylase activity by endogenous tannins present in tea. | 2016 | 27135007 |
| green tea flavour determinants and their changes over manufacturing processes. | flavour determinants in tea infusions and their changes during manufacturing processes were studied using camellia sinensis cultivars 'bai-sang cha' ('bas') possessing significant floral scents and 'fuding-dabai cha' ('fud') with common green tea odour. metabolite profiling based on odour activity threshold revealed that 'bas' contained higher levels of the active odorants β-ionone, linalool and its two oxides, geraniol, epoxylinalool, decanal and taste determinant catechins than 'fud' (p<0.05). ... | 2016 | 27374591 |
| mineral and metabolic profiles in tea leaves and flowers during flower development. | tea [camellia sinensis (l.) o. kuntze] is one of the most popular non-alcoholic beverage crops in the world, and the physiological processes and gene regulations involved in development in tea plants have been well characterized. however, relatively little is known about the metabolic changes combined with mineral distributions that occur during flower development. here we detected the contents of 11 elements in tea leaves and flowers and found that, some of them, especially phosphorus, sulfur a ... | 2016 | 27372442 |
| gene expression analysis of bud and leaf color in tea. | purple shoot tea attributing to the high anthocyanin accumulation is of great interest for its wide health benefits. to better understand potential mechanisms involved in purple buds and leaves formation in tea plants, we performed transcriptome analysis of six green or purple shoot tea individuals from a f1 population using the illumina sequencing method. totally 292 million rna-seq reads were obtained and assembled into 112,233 unigenes, with an average length of 759 bp and an n50 of 1081 bp. ... | 2016 | 27362295 |
| tea flavonoids for bone health: from animals to humans. | osteoporosis is a skeletal disease characterized by a deterioration of bone mass and bone quality that predisposes an individual to a higher risk of fragility fractures. emerging evidence has shown that the risk for low bone mass and osteoporosis-related fractures can be reduced by nutritional approaches aiming to improve bone microstructure, bone mineral density, and strength. tea and its flavonoids, especially those of black tea and green tea, have been suggested to protect against bone loss a ... | 2016 | 27356546 |
| anti-plaque effect of a synergistic combination of green tea and salvadora persica l. against primary colonizers of dental plaque. | green tea (gt), leafs of camellia sinensis var. assamica, is widely consumed as healthy beverage since thousands of years in asian countries. chewing sticks (miswak) of salvadora persica l. (sp) are traditionally used as natural brush to ensure oral health in developing countries. both gt and sp extracts were reported to have anti-bacterial activity against many dental plaque bacteria. however, their combination has never been tested to have anti-bacterial and anti-adherence effect against prima ... | 2016 | 27343694 |
| the microbiome and metabolites in fermented pu-erh tea as revealed by high-throughput sequencing and quantitative multiplex metabolite analysis. | pu-erh is a tea produced in yunnan, china by microbial fermentation of fresh camellia sinensis leaves by two processes, the traditional raw fermentation and the faster, ripened fermentation. we characterized fungal and bacterial communities in leaves and both pu-erhs by high-throughput, rdna-amplicon sequencing and we characterized the profile of bioactive extrolite mycotoxins in pu-erh teas by quantitative liquid chromatography-tandem mass spectrometry. we identified 390 fungal and 629 bacteria ... | 2016 | 27337135 |
| heavy metal content in tea soils and their distribution in different parts of tea plants, camellia sinensis (l). o. kuntze. | soils contaminated with heavy metals may pose a threat to environment and human health if metals enter the food chain over and above threshold levels. in general, there is a lack of information on the presence of heavy metals in tea [camellia sinensis (l). o. kuntze] plants and the soils in which they are grown. therefore, an attempt was made to establish a database on the important heavy metals: cadmium (cd), chromium (cr), nickel (ni), and lead (pb). for an initial survey on heavy metals, soil ... | 2016 | 27334344 |
| fortification of alcoholic beverages (12% v/v) with tea (camellia sinensis) reduces harmful effects of alcohol ingestion and metabolism in mouse model. | an animal model was used to study the health benefits inherent in tea fortified alcoholic beverages fed to laboratory mice. | 2016 | 27110378 |
| tea consumption is inversely associated with depressive symptoms in the elderly: a cross-sectional study in eastern china. | epidemiological studies suggest that higher tea consumption was associated with lower risk of depressive symptoms, but this has not been found consistently. moreover, the effect of different types of tea on depressive symptoms needs to be further explored. this study aimed to examine the association between tea consumption and depressive symptoms in chinese elderly. | 2016 | 27107254 |
| differential transcriptome analysis of leaves of tea plant (camellia sinensis) provides comprehensive insights into the defense responses to ectropis oblique attack using rna-seq. | tea is a very popular and healthy nonalcoholic beverage worldwide. as an evergreen woody plant, the cultivation of tea plants (camellia sinensis) is challenged by biotic stresses, and one of which is feeding of ectropis oblique. in china, e. oblique infestation causes serious damages in many tea cultivation areas. tea plants have evolved sophisticated strategies to cope with attack by e. oblique. to elucidate the molecular mechanisms of the response to e. oblique in tea plants, the differential ... | 2016 | 27098524 |
| hypocholestrolic effect of spent black tea leaves replaced with wheat bran in broiler ration. | black tea leaves (camellia sinensis) have been known for many years in lowering cholesterol level. the purpose of the present study was to find the effects of spent black tea leaves as a substitute of wheat bran on cholesterol reduction in broiler chicks. for this purpose a total of hundred & fifty (150), day old broiler poultry chicks were purchased from the local market. the spent black tea leaves were collected from tea stalls. chicks were randomly distributed into 5 main groups according to ... | 2016 | 27087091 |
| theaflavin-3, 3'-digallate induces apoptosis and g2 cell cycle arrest through the akt/mdm2/p53 pathway in cisplatin-resistant ovarian cancer a2780/cp70 cells. | ovarian cancer is the most lethal gynecological cancer among women worldwide. adverse side effects and acquired resistance to conventional platinum based chemotherapy are major impediments in ovarian cancer treatment, and drive the development of more selective anticancer drugs that target cancer-specific defects. in this study, theaflavin-3, 3'-digallate (tf3), the major theaflavin monomer in black tea, exhibited a potent growth inhibitory effect on the cisplatin-resistant ovarian cancer a2780/ ... | 2016 | 27082635 |
| green tea (-)-epigallotocatechin-3-gallate induces pgc-1α gene expression in hepg2 cells and 3t3-l1 adipocytes. | green tea (camellia sinensis) is one of the most popular beverages in the world and has been acknowledged for centuries as having significant health benefits. (-)-epigallocatechin-3-gallate (egcg) is the most abundant catechin in green tea, and it has been reported to have health benefit effects. peroxisome proliferator-activated receptor γ coactivator (pgc)-1α is a crucial regulator of mitochondrial biogenesis and hepatic gluconeogenesis. the objective of this study was to investigate whether e ... | 2016 | 27069908 |
| determination of some selected secondary metabolites and their invitro antioxidant activity in commercially available ethiopian tea (camellia sinensis). | eight brands of tea (camellia sinensis),which are cultivated and commercially available in ethiopian market, were analyzed for estimation of their total secondary metabolites (polyphenols, flavonoids and tannins) content and free radical scavenging activity which is expressed on dry weight basis. in this present study, the total polyphenols, tannin and flavonoid contents were studied spectrophotometrically using folin-dennis, folin-dennis/protein precipitation and aluminium chloride methods resp ... | 2016 | 27069832 |
| transcriptomic analysis reveals the molecular mechanisms of drought-stress-induced decreases in camellia sinensis leaf quality. | the tea plant [camellia sinensis (l.) o. kuntze] is an important commercial crop rich in bioactive ingredients, especially catechins, caffeine, theanine and other free amino acids, which the quality of tea leaves depends on. drought is the most important environmental stress affecting the yield and quality of this plant. in this study, the effects of drought stress on the phenotype, physiological characteristics and major bioactive ingredients accumulation of c. sinensis leaves were examined, an ... | 2016 | 27066035 |
| de novo sequencing of the leaf transcriptome reveals complex light-responsive regulatory networks in camellia sinensis cv. baijiguan. | tea plants (camellia sinensis l.) possess high genetic diversity that is important for breeding. one cultivar, baijiguan, exhibits a yellow leaf phenotype, reduced chlorophyll (chl) content, and aberrant chloroplast structures under high light intensity. in contrast, under low light intensity, the flush shoot from baijiguan becomes green, the chl content increases significantly, and the chloroplasts exhibit normal structures. to understand the underlying molecular mechanisms for these observatio ... | 2016 | 27047513 |
| (-)-epigallocatechin gallate inhibits asymmetric dimethylarginine-induced injury in human brain microvascular endothelial cells. | (-)-epigallocatechin gallate (egcg) is the main polyphenol component of green tea (leaves of the camellia sinensis plant). egcg has been reported to protect human brain microvascular endothelial cells (hbmecs) against injury in several models. however, the exact mechanism is still unclear. in the current study we found that egcg protected against asymmetric dimethylarginine (adma)-induced hbmec injury, and inhibited adma-induced reactive oxygen species production and malondialdehyde expression. ... | 2016 | 27038929 |
| three new oxidation products produced from epigallocatechin-3- o-gallate and epicatechin-3-o-gallate. | during chemical studies on uncharacterized black tea polyphenols, the enzymatic oxidation of a mixture of epigallocatechin-3-o-gallate (1) and epicatechin-3-o-gallate (2) was examined, and three new dimeric products together with six known catechin dimers were isolated. two of the new compounds have tricyclo[5.2.2.0²,⁶]undecane and tricyclo[5.2.1.0²,⁶]decane carboxyl structures generated by oxidative coupling between two pyrogallol-b-rings of 1. another new product was a dimer connected by a c-c ... | 2016 | 27032198 |
| green tea, black tea consumption and risk of endometrial cancer: a systematic review and meta-analysis. | several studies have assessed the association between green and black tea consumption and the risk of endometrial cancer (ec) and have yielded inconsistent results. | 2016 | 26138307 |
| coffee prevents proximal colorectal adenomas in japanese men: a prospective cohort study. | this prospective cohort study aimed to show that coffee prevents the recurrence of colorectal tumors (adenomas, precursors of colorectal cancer, and early-stage colorectal cancers) as well as colorectal cancer. the present study included 307 patients who participated in a clinical study that required endoscopy to remove a colorectal tumor. the amount of coffee consumed by the patients at study inclusion and the frequency of colorectal tumors, as detected by colonoscopy over the subsequent 4 year ... | 2016 | 26291025 |
| complementary transcriptomic and proteomic analyses of a chlorophyll-deficient tea plant cultivar reveal multiple metabolic pathway changes. | to uncover the mechanisms that underlie the chlorina phenotype of the tea plant, this study employs morphological, biochemical, transcriptomic, and itraq-based proteomic analyses to compare the green tea cultivar lj43 and the yellow-leaf tea cultivar zh1. zh1 exhibited the chlorina phenotype, with significantly decreased chlorophyll content and abnormal chloroplast development compared with lj43. zh1 also displayed higher theanine and free amino acid content and lower carotenoid and catechin con ... | 2016 | 26344129 |
| investigation of adverse effects of interactions between herbal drugs and natural blood clotting mechanism. | throughout the world, herbal medicines are consumed by most of the patients without considering their adverse effects. many herbal medicines/plant extracts have been reported to interact with the natural blood clotting system. in continuation to this effort, thirty medicinal plant extracts were allowed to interact with citrated human blood and the clotting time was measured after re-calcification in vitro using lee and white method. the aq. leaf ext. of syzygium cumini and camellia sinensis sign ... | 2016 | 26340850 |
| transcriptome-wide identification of camellia sinensis wrky transcription factors in response to temperature stress. | tea plant [camellia sinensis (l.) o. kuntze] is a leaf-type healthy non-alcoholic beverage crop, which has been widely introduced worldwide. tea is rich in various secondary metabolites, which are important for human health. however, varied climate and complex geography have posed challenges for tea plant survival. the wrky gene family in plants is a large transcription factor family that is involved in biological processes related to stress defenses, development, and metabolite synthesis. there ... | 2016 | 26308611 |
| effects of brewing conditions on the antioxidant capacity of twenty-four commercial green tea varieties. | a novel paper-based nanoceria reducing antioxidant capacity (nanocerac) assay for antioxidant detection (sharpe, frasco, andreescu, & andreescu, 2012), has been adapted for the first time as a high-throughput method, in order to measure the effect of brewing conditions and re-infusion on the antioxidant capacity of twenty-four commercial green teas. the oxygen radical absorbance capacity (orac) assay, frequently applied to complex foods and beverages, was used as a comparator measure of antioxid ... | 2016 | 26304363 |
| using uv-vis spectroscopy for simultaneous geographical and varietal classification of tea infusions simulating a home-made tea cup. | in this work we proposed a method to verify the differentiating characteristics of simple tea infusions prepared in boiling water alone (simulating a home-made tea cup), which represents the final product as ingested by the consumers. for this purpose we used uv-vis spectroscopy and variable selection through the successive projections algorithm associated with linear discriminant analysis (spa-lda) for simultaneous classification of the teas according to their variety and geographic origin. for ... | 2016 | 26304362 |
| comparative evaluation of five plant extracts and juices for nanoiron synthesis and application for hexavalent chromium reduction. | the effectiveness of five plant extracts and juices, i.e. extracts of camellia sinensis (green tea, gt), syzygium aromaticum (clove, cl), mentha spicata (spearmint, sm), punica granatum juice (pomegranate, pg) and red wine (rw), for the production of nanoiron suspensions and their application for cr(vi) reduction was investigated. polyphenols contained in extracts act as reducing agents for iron ions in aqueous solutions, forming thus iron nanoparticles, and stabilize the nanoparticles produced ... | 2016 | 26356183 |
| long-term intake of white tea prevents oxidative damage caused by adriamycin in kidney of rats. | white tea infusion (camelia sinensis) has antioxidants properties. the infusion contains polyphenols that have been proposed to induce antioxidant response element (are) response via nuclear factor e2-related factor 2 (nrf2). adriamycin (adr) has antitumour properties and oxidative effects. oxidative stress is related to a variety of kidney diseases. prevention of the oxidative stress through long-term intake of white tea and the study of the molecular mechanisms involved in protection could be ... | 2016 | 26441376 |
| effects of flavonol-rich green tea cultivar (camellia sinensis l.) on plasma oxidized ldl levels in hypercholesterolemic mice. | to examine the possible benefits of tea flavonols, we compared anti-atherogenic effects between common and flavonol-rich tea cultivars. the tea infusion made from a flavonol-rich cultivar, but not a common cultivar, significantly decreased the plasma oxidized low-density lipoprotein level in mice fed a high-cholesterol diet. the result suggests that tea flavonols have the potential to protect against cardiovascular diseases. | 2016 | 26364623 |
| camellia sinensis mediated enhancement of humoral immunity to particulate and non-particulate antigens. | the most common drinking beverage in large portion of the world is camellia sinensis (green tea). in the present study, we evaluated the adjuvant effect of green tea and tea polyphenols to particulate and non-particulate antigens. balb/c mice were immunized with particulate and non-particulate antigens. modulation of immunoglobulin-secreting splenocytes, igg-mediated and igm-mediated immunity, was evaluated by hemolytic plaque assay and enzyme-linked immunosorbent assay, respectively. dose-depen ... | 2016 | 26478000 |
| effect of black tea on antioxidant, textural, and sensory properties of chinese steamed bread. | black tea is rich in phenolic antioxidants and has various health benefits. chinese steamed bread (csb) is a traditional food produced through steaming of fermented dough. black tea extracts were incorporated into northern style csb formulation at varying concentrations up to 175mg gallic acid equivalent/gram of wheat flour. gelatinization properties of wheat flour were not affected by the black tea addition. rheological analysis of wheat flour showed that black tea increased pasting viscosity, ... | 2016 | 26471674 |
| volatile compounds and sensory characteristics of various instant teas produced from black tea. | various instant teas produced differently from black tea [freeze-dried instant tea (fdit), spray-dried instant tea (sdit), and decaffeinated instant tea (dcit)], were compared for their differences in volatile compounds as well as descriptive sensory analysis (dsa). a total of 63 volatile compounds in all tea samples (eight aldehydes, ten alcohols, nine ketones, five esters, eight acids, ten terpenes/terpenoids, ten furans/furanones, two pyrroles, and one miscellaneous compound) were tentatively ... | 2016 | 26471629 |
| simultaneous determination of free amino acids in pu-erh tea and their changes during fermentation. | pu-erh ripened tea is produced through a unique microbial fermentation process from the sun-dried leaves of large-leaf tea species (camellia sinensis (linn.) var. assamica (masters) kitamura) in yunnan province of china. in this study, the changes of amino acid profiles during fermentation of pu-erh tea were investigated, based on the improved hplc-uv method with pitc pre-column derivatization for the simultaneous determination of twenty free amino acids. results showed that aspartic acid, gluta ... | 2016 | 26471603 |
| reidentification of sex pheromones of tea geometrid ectropis obliqua prout (lepidoptera: geometridae). | tea geometrid ectropis obliqua prout (lepidoptera: geometridae) is an important defoliator of the tree crop camellia sinensis l. in china. the sex pheromones of e. obliqua have not been identified, but have potential importance relative to the biological control of this predator. in this study, the female sex pheromones of e. obliqua were identified and evaluated for use in the monitoring and mass trapping of this pest. the sex pheromone extracts were subjected to gas chromatography-electroanten ... | 2016 | 26491188 |
| biotechnological advances in tea (camellia sinensis [l.] o. kuntze): a review. | this article presents a comprehensive review on the success and limitations of biotechnological approaches aimed at genetic improvement of tea with a purpose to explore possibilities to address challenging areas. tea is a woody perennial tree with a life span of more than 100 years. conventional breeding of tea is slow and limited primarily to selection which leads to narrowing down of its genetic base. harnessing the benefits of wild relatives has been negligible due to low cross-compatibility, ... | 2016 | 26563347 |
| mechanisms of body weight reduction and metabolic syndrome alleviation by tea. | tea, a popular beverage made from leaves of the plant camellia sinensis, has been shown to reduce body weight, alleviate metabolic syndrome, and prevent diabetes and cardiovascular diseases in animal models and humans. such beneficial effects have generally been observed in most human studies when the level of tea consumption was three to four cups (600-900 mg tea catechins) or more per day. green tea is more effective than black tea. in spite of numerous studies, the fundamental mechanisms for ... | 2016 | 26577614 |
| epigallocatechin gallate and mitochondria-a story of life and death. | epigallocatechin gallate (egcg) is a flavonoid belonging to the chemical class of falvan-3-ols (catechins) esterified with gallic acid. it is the main catechin found in green tea (camellia sinensis l.) accounting for about 50% of its total polyphenols. extensive research performed in recent years has revealed that green tea demonstrates a wide range of positive biological activities against serious chronic diseases such as cardiovascular and neurodegenerative pathologies, cancer, metabolic syndr ... | 2016 | 26731017 |
| protective effects of black tea extract against oxidative dna damage in human lymphocytes. | the aim of the present study was to examine the genoprotective and radioprotective effects of black tea extract (bte) against the induction of single strand dna breaks in human lymphocytes subjected to hydrogen peroxide (h2o2) or gamma-rays (2 gy dose). lymphocytes were incubated with or without different concentrations of bte (0.005-500 µg/ml) for 30 min, followed by treatment with or without h2o2 (0.088 µmol/l) for 5 min. to examine the radioprotective effect of bte, the lymphocytes were incub ... | 2016 | 26718244 |
| differential expression of genes in purple-shoot tea tender leaves and mature leaves during leaf growth. | tea (camellia sinensis l.), contains high levels of secondary metabolic products with both commercial and medicinal value. at present, most cultivated tea plant have green leaves; although tea plants with purple leaves exist, their supply is inadequate. during leaf growth and maturation, the content of secondary metabolic compounds decreases, resulting in higher content in tender purple leaves (tpl), and lower content in mature green leaves (mgl). the aim of this study was to analyze the differe ... | 2016 | 26084622 |
| chronic black tea extract consumption improves endothelial function in ovariectomized rats. | menopause escalates the risk of cardiovascular diseases in women. there is an unmet need for better treatment strategy for estrogen-deficiency-related cardiovascular complications. here we investigated the impact of chronic black tea extract (bt) consumption on cardiovascular function and lipid metabolism using a rat model of estrogen deficiency. | 2016 | 26276555 |
| green tea catechin inhibits the activity and neutrophil release of matrix metalloproteinase-9. | green tea (camellia sinensis; lǜ chá) extracts have been shown to possess anti-oxidant and anti-inflammatory effects in various cell types. green tea extract (gtx) has been shown to significantly inhibit the activity of collagenase-3 (matrix metalloproteinase-13 (mmp-13)) in vitro. mmps, such as mmp-9, are known to be involved in many inflammatory diseases including periodontal disease. gtx and a major catechin, epigallocatechin-gallate (egcg), were examined for their ability to inhibit purified ... | 2016 | 27774417 |
| effects of green and black tea consumption on brain wave activities in healthy volunteers as measured by a simplified electroencephalogram (eeg): a feasibility study. | tea has been associated with many mental benefits, such as attention enhancement, clarity of mind, and relaxation. these psychosomatic states can be measured in terms of brain activity using an electroencephalogram (eeg). brain activity can be assessed either during a state of passive activity or when performing attention tasks and it can provide useful information about the brain's state. this study investigated the effects of green and black consumption on brain activity as measured by a simpl ... | 2016 | 25714035 |
| evaluation of the in vitro α-glucosidase inhibitory activity of green tea polyphenols and different tea types. | the objective of this study was to determine whether green tea, black tea and oolong tea have inhibitory potential against α-glucosidase which may be used to control postprandial hyperglycemia in type 2 diabetes mellitus. | 2016 | 25707691 |
| acute hepatitis after treatment for hair loss with oral green tea extracts (camellia sinensis). | nutritional additives based on green tea have been claiming various beneficial health effects. however, several case reports on hepatotoxicity after the intake of green tea derivatives containing camellia sinensis have been published. we report a patient with an acute hepatitis after intake of an oral green tea derivative claiming protection against hair loss, showing a histological image compatible with drug induced hepatitis. other important causes of hepatitis were excluded. after cessation o ... | 2016 | 19637786 |
| jaundice as a misadventure of a green tea (camellia sinensis) lover : a case report. | the case of a 76-year-old retired surgeon and lover of green tea (camellia sinensis) infusions who developed a clinical, sero-biochemical and histological picture of severe subacute hepatitis is reported. the clinical presentation was that of jaundice with asthenia and weight loss. abnormal liver function tests were associated with hyper-gammaglobulinemia, and the transient presence of anti-smooth-muscle antibodies and anca. liver histology showed mixed features of lobular hepatitis with central ... | 2016 | 19317284 |
| [toxic hepatitis due to camellia sinensis]. | 2016 | 18570823 | |
| copper (ii) ion selective liquid membrane electrode based on new schiff base carrier. | cu2+ selective pvc membrane electrode based on new schiff base 2, 2'-[1,9 nonanediyl bis (nitriloethylidyne)]-bis-(1-naphthol) as a selective carrier was constructed. the electrode exhibited a linear potential response within the activity range of 1.0 x 10(-6) - 5.0 x 10(-3) moll(-1) with a nernstian slope of 29 +/- 1 mv decade(-1) of cu2+ activity and a limit of detection 8.0 x 10(-7) mol l(-1). the response time of the electrode was fast, 10 s, and stable potentials were obtained within the ph ... | 2016 | 16734023 |
| tea consumption and ovarian cancer risk in a population-based cohort. | substantial evidence from laboratory studies indicates that green and black tea preparations may protect against various cancers. few epidemiologic studies, however, have examined the relationship specifically between tea consumption and risk of ovarian cancer. | 2016 | 16344429 |
| octadecyl silica membrane disks modified with a new schiff's base for the preconcentration of lead and copper before their determination in water samples. | a simple and fast method for the extraction and determination of ppt level of pb2+ and cu2+ ions using octadecyl-bonded silica membrane disks modified by a new tetradentates schiffs base [bis(2,4-dimethoxy benzaldehyde) ethylen diimine](tdsb) and inductively coupled plasma atomic emission spectrometry is described. extraction efficiency, and influence of flow rate, ph, type and the least amount of acid for stripping of cu2+ and pb2+ from the modified disks and break through volume were evaluated ... | 2016 | 15279104 |
| transcriptome analysis reveals candidate genes involved in blister blight defense in tea (camellia sinensis (l) kuntze). | to unravel the molecular mechanism of defense against blister blight (bb) disease caused by an obligate biotrophic fungus, exobasidium vexans, transcriptome of bb interaction with resistance and susceptible tea genotypes was analysed through rna-seq using illumina gaiix at four different stages during ~20-day disease cycle. approximately 69 million high quality reads were assembled de novo, yielding 37,790 unique transcripts with more than 55% being functionally annotated. differentially express ... | 2016 | 27465480 |
| effect of medium supplements on agrobacterium rhizogenes mediated hairy root induction from the callus tissues of camellia sinensis var. sinensis. | tea (camellia sinensis l.) is recalcitrant to agrobacterium-mediated genetic transformation largely due to the bactericidal effects of tea polyphenols and phenolics oxidation induced by necrosis of explant tissue over the process of transformation. in this study, different antioxidants/adsorbents were added as supplements to the co-cultivation and post co-cultivation media to overcome these problems for the transformation improvement. tea-cotyledon-derived calli were used as explants and agrobac ... | 2016 | 27428960 |
| global analysis of type three secretion system and quorum sensing inhibition of pseudomonas savastanoi by polyphenols extracts from vegetable residues. | protection of plants against bacterial diseases still mainly relies on the use of chemical pesticides, which in europe correspond essentially to copper-based compounds. however, recently plant diseases control is oriented towards a rational use of molecules and extracts, generally with natural origin, with lower intrinsic toxicity and a reduced negative environmental impact. in this work, polyphenolic extracts from vegetable no food/feed residues of typical mediterranean crops, as olea europaea, ... | 2016 | 27668874 |
| potential of camellia sinensis proanthocyanidins-rich fraction for controlling malaria mosquito populations through disruption of larval development. | anopheles arabiensis and a. gambiae (sensu stricto) are the most prolific afrotropical malaria vectors. population control efforts of these two vectors have been hampered by extremely diverse larval breeding sites and widespread resistance to currently available insecticides. control of mosquito larval stages using bioactive compounds of plant origin has the potential to suppress vector populations leading to concomitant reduction in disease transmission rates. in this study, we evaluated the ef ... | 2016 | 27660043 |
| dual mechanisms regulating glutamate decarboxylases and accumulation of gamma-aminobutyric acid in tea (camellia sinensis) leaves exposed to multiple stresses. | γ-aminobutyric acid (gaba) is one of the major inhibitory neurotransmitters in the central nervous system. it has multiple positive effects on mammalian physiology and is an important bioactive component of tea (camellia sinensis). gaba generally occurs at a very low level in plants but gaba content increases substantially after exposure to a range of stresses, especially oxygen-deficiency. during processing of tea leaves, a combination of anoxic stress and mechanical damage are essential for th ... | 2016 | 27021285 |
| identification, classification, and expression profiles of heat shock transcription factors in tea plant (camellia sinensis) under temperature stress. | in vascular plants, heat shock transcription factors (hsfs) regulate heat stress response by regulating the expression of heat shock proteins. this study systematically and comprehensively analyzed the hsf family in tea plant [camellia sinensis (l.) o. kuntze]. a total of 16 cshsfs were identified from the transcriptome database of tea plant and analyzed for their phylogenetic relationships, motifs, and physicochemical characteristics. on the basis of the phylogenetic comparison of tea plant wit ... | 2016 | 26431998 |
| peroxidase can perform the hydroxylation step in the 'oxidative cascade' during oxidation of tea catechins. | formation of black tea thearubigins involves at least two of the following oxidation steps: (i) oligomerization, (ii) rearrangement, (iii) hydroxylation. the first two are mainly catalysed by polyphenol oxidase(ppo), whereas the enzyme responsible for hydroxylation has not yet been identified. two main oxidative activities, peroxidase(pod) and ppo, occur in tea leaves. pod was hypothesized to be responsible for hydroxylation. model systems with horseradish pod and mushroom tyrosinase were used i ... | 2016 | 27723327 |
| metabolic changes of caffeine in tea plant (camellia sinensis (l.) o. kuntze) as defense response to colletotrichum fructicola. | tea plant (camellia sinensis) is one of the most economically valuable crops in the world. anthracnose can affect the growth of leaves and cause serious yield losses of tea. tea plants are rich in secondary metabolites; however, their roles in resistance to anthracnose are unclear. herein we compared the contents of total phenolics, catechins, and caffeine in two cultivars with different resistances to anthracnose during colletotrichum fructicola infection. (-)-epigallocatechin-3-gallate (egcg), ... | 2016 | 27541180 |