Publications
| Title | Abstract | Year Filter | PMID(sorted descending) Filter |
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| structural identification of theaflavin trigallate and tetragallate from black tea using liquid chromatography/electrospray ionization tandem mass spectrometry. | black tea contains two major pigments, theaflavins and thearubigins. these polyphenols have been associated with certain health benefits including prevention of heart disease and cancer. elucidating and characterizing the structural aspects of thearubigins, the most abundant pigment in black tea, has been a challenge for many years. therefore further studies of black tea polyphenols must be conducted in effort to solve this thearubigin dispute. in the present study, black tea extract was found t ... | 2012 | 23066878 |
| suppressive subtractive hybridization approach revealed differential expression of hypersensitive response and reactive oxygen species production genes in tea (camellia sinensis (l.) o. kuntze) leaves during pestalotiopsis thea infection. | tea (camellia sinensis (l.) o. kuntze) is an economically important plant cultivated for its leaves. infection of pestalotiopsis theae in leaves causes gray blight disease and enormous loss to the tea industry. we used suppressive subtractive hybridization (ssh) technique to unravel the differential gene expression pattern during gray blight disease development in tea. complementary dna from p. theae-infected and uninfected leaves of disease tolerant cultivar upasi-10 was used as tester and driv ... | 2012 | 23065401 |
| aflatoxin-induced biochemical changes in liver of mice and its mitigation by black tea extract. | aflatoxin belongs to the class of naturally occurring mycotoxins, food contaminants having potent carcinogenicity. we have evaluated the ameliorative role of black tea extract on aflatoxin-induced biochemical changes in the liver of albino male mice. adult male mice were orally administered with 750 and 1500 pg of aflatoxin in 0.2 ml olive oil/kg b.w./day for 30 days. oral administration of aflatoxin caused, as compared with controls, significant, dose-dependent reduction in dna, rna, protein an ... | 2012 | 23061280 |
| mechanism of hydrolysis of native and cooked starches from different botanical sources in the presence of tea extracts. | a series of experiments were conducted to highlight the mechanism of inhibition of hydrolysis and differences in hydrolysis among starches from different sources in the presence of green or black tea extract. the first experiment showed that black tea extract was more effective at reducing final viscosity for all starches. the second experiment showed that black tea was more effective at inhibiting starch hydrolysis compared to green tea when starch, tea extract, and pancreatin were added at the ... | 2012 | 23057852 |
| structural and docking studies of a nucleoside diphosphate kinase 1 (csndpk1) from tea [camellia sinensis (l.) o. kuntze]. | nucleoside diphosphate kinase (ndpk, ec 2.7.4.6) is a housekeeping gene, which functions in the general homeostasis of cellular nucleoside triphosphate (ntp) pools. among the various ndpk isoforms, cytosolic ndpk1 has been shown to be the main ndpk isoform in plants, accounting for more than 70 % of total ndpk activity in plants. for the first time, a full-length cdna (697 bp), designated as csndpk1 was cloned from tea leaves and consisted of a 448-bp open reading frame (orf) encoding a 147-amin ... | 2012 | 23054822 |
| short-term effects of polyphenol-rich black tea on blood pressure in men and women. | there is increasing evidence that black tea polyphenols contribute to vascular health. we have recently shown that regular ingestion of polyphenol-rich black tea over 6 months results in lower systolic and diastolic blood pressure. however, the time course of these effects remains unclear. therefore, our objective was to determine if short-term effects of tea on blood pressure could contribute to longer-term benefits of regular tea consumption on blood pressure. men and women (n = 111) were recr ... | 2013 | 23038021 |
| black tea: chemical analysis and stability. | tea is the most popular flavored and functional drink worldwide. the nutritional value of tea is mostly from the tea polyphenols that are reported to possess a broad spectrum of biological activities, including anti-oxidant properties, reduction of various cancers, inhibition of inflammation, and protective effects against diabetes, hyperlipidemia and obesity. tea polyphenols include catechins and gallic acid in green and white teas, and theaflavins and thearubigins as well as other catechin pol ... | 2013 | 23037977 |
| impedance study of tea with added taste compounds using conducting polymer and metal electrodes. | in this study the sensing capabilities of a combination of metals and conducting polymer sensing/working electrodes for tea liquor prepared by addition of different compounds using an impedance mode in frequency range 1 hz-100 khz at 0.1 v potential has been carried out. classification of six different tea liquor samples made by dissolving various compounds (black tea liquor + raw milk from milkman), (black tea liquor + sweetened clove syrup), (black tea liquor + sweetened ginger syrup), (black ... | 2012 | 23035436 |
| influence of exogenous pigmentation on the optical properties of orthodontic elastic ligatures. | the aim of this study was to assess the optical properties of orthodontic elastic ligatures under the influence of exogenous pigments contained in the daily diet. | 2015 | 23032209 |
| antimicrobial activities of tocklai vegetative tea clones. | thirty-one tocklai vegetative (tv) tea clones contained caffeine and total catechin 44.39 and 227.55 mg/g dry weight of leaves, respectively. the (-)-epigallocatechin gallate (egcg) was the most abundant (109.60 mg/g) followed by -(-)-epigallocatechin (egc, 44.54 mg/g), (-)-epicatechin gallate (ecg, 41.74 mg/g), (-)-epicatechin (ec, 27.42 mg/g) and +catechin (4.25 mg/g). total catechins were highest in tv 20 (509.7 mg/g) and lowest in tv 6 (71.7 mg/g). the tea clones that contain high level of t ... | 2011 | 23024406 |
| effects of the medicinal plants curcuma zedoaria and camellia sinensis on halitosis control. | volatile sulphur compounds (vsc) are the gases mainly responsible for halitosis (bad breath). the aim of this research was to evaluate the effects of medicinal plants on halitosis control. two commonly used plants were tested: curcuma zedoaria and camellia sinensis (green tea). these plants were prepared as an aqueous solution and used as mouthwashes, compared with a standard mouthwash of 0.12% chlorhexidine gluconate and a placebo (water). the experiment was conducted with 30 volunteers from th ... | 2013 | 23019084 |
| color stability of siloranes versus methacrylate-based composites after immersion in staining solutions. | the purpose of this study was to determine, by using a spectrophotometer device, the color stability of silorane in comparison with four methacrylate-based composites after being immersed in different staining solutions such as coffee, black tea, red wine, orange juice, and coke, and distilled water as control group. | 2013 | 22993112 |
| improvement of tea leaves fermentation through pectinases. | the pectinase enzymes isolated from aspergillus niger, byssochlamys fulva and mucor circinelloides were used for fermentation of tea leaves from camellia sinensis plant. the use of partially purified enzymes from aspergillus niger and mucor circinelloides resulted in significant (p < 0.001) increase in the phenolic compounds, hence, improvement in tea quality. maximum increase in phenolic compounds was found in tea leaves treated with partially purified polygalacturonase (pgase) from mucor circi ... | 2012 | 22982636 |
| planar solid phase extraction clean-up for pesticide residue analysis in tea by liquid chromatography-mass spectrometry. | efficient clean-up is indispensable for preventing matrix effects in multi-residue analysis of pesticides in food by liquid and gas chromatography (lc and gc) coupled to mass spectrometry (ms). high-throughput planar solid phase extraction (htpspe) was recently introduced as a new clean-up concept in residue analysis of pesticides in fruit and vegetables (c. oellig, w. schwack, 2011 [45]). thin-layer chromatography (tlc) was used to completely separate pesticides from matrix compounds and to foc ... | 2012 | 22981507 |
| characterisation of volatile and non-volatile metabolites in etiolated leaves of tea (camellia sinensis) plants in the dark. | aroma is an essential factor affecting the quality of tea (camellia sinensis) products. while changes of volatile compounds during tea manufacturing have been intensively studied, the effect of environmental factors on volatile contents of fresh tea leaves has received less attention. we found that c. sinensis var. yabukita kept in darkness by shading treatment for 3 weeks developed etiolated leaves with significantly increased levels of volatiles, especially volatile phenylpropanoids/benzenoids ... | 2012 | 22980801 |
| incompatibility between propericiazine oral solution and tea-based drink. | here, we studied the incompatibility between an oral solution of propericiazine (pcz), an antipsychotic drug, and various commercially available bottled tea-based drinks. when 0.5 ml of the pcz oral solution (10 mg/ml) was mixed with 16.5 ml of a tea-based drink (such as green tea, oolong tea, and black tea), the residual pcz content declined to approximately 50% in some mixed solutions. after mixing with other tea-based drinks, the residual pcz content declined to approximately 30%, while in ot ... | 2012 | 22976331 |
| new phenolic compounds from camellia sinensis l. fermented leaves. | two new phenolic compounds (1 and 2, named as teasperol and teasperin, respectively) were isolated from fermented tea (camellia sinensis l.) products, together with known phenolic compounds. teasperol (1) was isolated from chinese traditional post-fermented tea leaves (liu-pao tea) and teasperin (2) was from a japanese tea product which was selectively fermented with aspergillus sp. the chemical structures of 1 and 2 were elucidated based on the analyses of their spectroscopic data. | 2013 | 22972630 |
| coffee and tea consumption and risk of lung cancer: a dose-response analysis of observational studies. | results from the recent meta-analysis suggested a favorable effect of green tea consumption and risk of lung cancer, while no significant association was found between black tea consumption and risk of lung cancer. besides, a significantly positive association was found between coffee consumption and risk of lung cancer. however, the relationship of green tea and coffee consumption is unclear. thus the dose-response relationship was assessed by restricted cubic spline model and multivariate rand ... | 2012 | 22964413 |
| effects of addition of egg ovotransferrin-derived peptides on the oxygen radical absorbance capacity of different teas. | ovotransferrin-derived peptides showed synergistic effects with vitamin c, epigallocatechin gallate (egcg), and caffeic acid, but not quercetin in our previous report. in this study, we further investigated the interactions between ovotransferrin-derived peptides and teas, based on the oxygen radical absorbance capacity (orac) assay. our results showed that there was no significant difference in orac values among green, oolong, and black teas. for all the samples, 80% methanol extracts possessed ... | 2012 | 22953899 |
| antioxidant capacity of teas and herbal infusions: polarographic assessment. | hydrogen peroxide scavenging (hps) activity of unfermented (green, yellow, and white), partially fermented (oolong), and completely fermented (black) tea ( camellia sinensis ), maté ( ilex paraguariensis ), and various herbal infusions, as well as individual compounds (flavan-3-ols, flavonols, cinnamic and benzoic acids, and methylxanthines), was assessed by recently developed direct current (dc) polarographic assay. correlations of tea and herbal infusion hps activity with total phenolic conten ... | 2012 | 22950743 |
| growth inhibition of walker carcinosarcoma 256 with alcoholic extract of green tea leaves (camellia sinensis). | to evaluate the antitumor activity of alcoholic extracts of green tea (camella sinensis). | 2012 | 22936089 |
| l-theanine attenuates abstinence signs in morphine-dependent rhesus monkeys and elicits anxiolytic-like activity in mice. | l-theanine, 2-amino-4-(ethylcarbamoyl) butyric acid, an amino acid found in green tea (camellia sinensis), is sold in the united states as a dietary supplement to reduce stress and improve cognition and mood. the observations that l-theanine has been shown to inhibit caffeine's stimulatory effects and that caffeine produces precipitated withdrawal signs in opioid-addicted monkeys and some opioid withdrawal signs in some normal monkeys, suggest that l-theanine may suppress opioid withdrawal signs ... | 2012 | 22935630 |
| [assessment of stimulant use especially caffeine intake in selected group of the breastfeeding women]. | taking into account the negative impact of stimulants, including alcohol, nicotine and excessive consumption of caffeine on the baby and his mother, a very important is to stop or to restrict their use, especially during pregnancy and lactation. | 2012 | 22928364 |
| determination of cd (ii), cu (ii), and pb (ii) in some foods by faas after preconcentration on modified silica gels with thiourea. | this study describes preconcentration method for determination of cd (ii), cu (ii), and pb (ii) in some food samples. silica gel was modified with thiourea and characterized by ir and c, h, n, s elemental analysis. modified silica gel was used as a solid phase extraction for determination of cd (ii), cu (ii) and pb (ii) in tuna fish, biscuit, black tea, rice, kaşar cheese, honey, tomato paste, and margarine samples. the analytical conditions including eluent type, ph of sample solutions, flow ra ... | 2012 | 22924612 |
| dermal delivery by niosomes of black tea extract as a sunscreen agent. | the primary objective of this study was to investigate the feasibility of using niosomes as a delivery vehicle for the dermal administration in vitro of black tea extract (bte) as a sunscreen. | 2013 | 22913389 |
| synthesis of silver nanoparticles by using tea leaf extract from camellia sinensis. | the development of the biological synthesis of nanoparticles using microorganisms or plant extracts plays an important role in the field of nanotechnology as it is environmentally friendly and does not involve any harmful chemicals. in this study, the synthesis of silver nanoparticles using the leaves extract of chinese tea from camellia sinensis is reported. the synthesized nanoparticles were characterized using uv-vis spectroscopy, x-ray diffraction (xrd), transmission electron microscopy (tem ... | 2012 | 22904632 |
| anti-inflammatory effects of a polyphenols-rich extract from tea (camellia sinensis) flowers in acute and chronic mice models. | while beneficial health properties of tea leaves have been extensively studied, less attention is paid to the flowers of tea. in this study, the anti-inflammatory effects of hot water extract of tea (camellia sinensis) flowers were investigated. pharmacological studies found that administration of tea flowers extract (tfe) could effectively inhibit croton oil-induced ear edema and carrageenin-induced paw edema. furthermore, administration of tfe also protected against propionibacterium acnes (p. ... | 2012 | 22900128 |
| evidence that the ceratobasidium-like white-thread blight and black rot fungal pathogens from persimmon and tea crops in the brazilian atlantic forest agroecosystem are two distinct phylospecies. | the white-thread blight and black rot (wtbr) caused by basidiomycetous fungi of the genus ceratobasidium is emerging as an important plant disease in brazil, particularly for crop species in the ericales such as persimmon (diospyros kaki) and tea (camellia sinensis). however, the species identity of the fungal pathogen associated with either of these hosts is still unclear. in this work, we used sequence variation in the internal transcribed spacer regions, including the 5.8s coding region of rd ... | 2012 | 22888299 |
| antioxidant activities of extracts from teas prepared from medicinal plants, morus alba l., camellia sinensis l., and cudrania tricuspidata , and their volatile components. | the antioxidant activity of essences of teas prepared from mulberry ( morus alba l.), camellia sinensis l., and cudrania tricuspidata (carr.) burea plant was examined using two antioxidant assays. selected volatile chemicals identified in these plants were also tested for antioxidant activity. all extracts exhibited antioxidant activity with a clear dose response in the aldehyde/carboxylic acid and the malonaldehyde/gas chromatography (ma/gc) assays. antioxidant activity of extracts at the level ... | 2012 | 22871255 |
| investigating the effect of black tea consumption during pregnancy on the oxidant/antioxidant status of breastmilk. | black tea is associated with antioxidant properties. the objective of this study was to investigate the effect of the amount of black tea consumption during pregnancy on the oxidant/antioxidant status of breastmilk. | 2013 | 22871122 |
| green tea extract: possible mechanism and antibacterial activity on skin pathogens. | camellia sinensis (tea) is known for its therapeutic properties (anti-inflammatory, anti-microbial, anti-tumour, anti-oxidative and anti-ageing). although, anti-microbial properties of green tea have been studied, its role against bacterial strains related to skin infections and mechanism of action is not well understood. we focussed on exploring anti-microbial activity and the basic mechanism of aqueous green tea leaf extract on selected bacterial strains. staphylococcus epidermidis, micrococcu ... | 2012 | 22868144 |
| rapid and selective quantification of l-theanine in ready-to-drink teas from chinese market using spe and uplc-uv. | an ultra performance liquid chromatography (uplc) method combined with solid phase extraction (spe) sample pre-treatment was developed and validated for the rapid quantification of l-theanine in ready-to-drink (rtd) teas. uplc analysis of twenty-seven rtd teas from the chinese market revealed that the l-theanine levels in various types of rtd teas were significantly different. rtd green teas were found to contain highest mean l-theanine level (37.85±20.54 mg/l), followed by jasmine teas (36.60±1 ... | 2012 | 22868106 |
| green and black tea intake in relation to prostate cancer risk among singapore chinese. | tea is one of the most commonly consumed beverages worldwide. to date, observational data from prospective cohort studies investigating the relationship between green and black tea intake and prostate cancer risk are sparse and equivocal. in a population-based, prospective cohort study of chinese men in singapore, we investigated the relationship between green and black tea intake and prostate cancer risk. | 2012 | 22864870 |
| potentiating effects of honey on antioxidant properties of lemon-flavoured black tea. | health benefits including antioxidant potential of black tea (camellia sinensis), lemon (citrus limon) and honey bees (apis mellifera) have been extensively reported. nevertheless, nothing is reported about the effects of their concomitant use. herein, those effects were evaluated in infusions of lemon-flavoured black tea with three different kinds of honey (light amber, amber and dark amber) from lavandula stoechas, erica sp. pl. and other indigenous floral species from north-east portugal, a r ... | 2013 | 22856394 |
| changes of growth, photosynthesis and alteration of leaf antioxidative defence system of tea [camellia sinensis (l.) o. kuntze] seedlings under aluminum stress. | tea [camellia sinensis (l.) o. kuntze] is an aluminum (al) hyperaccumulator plant and is commercially important due to its high content of antioxidants. although al induced growth is well-known for the plants growing in acid soil, yet the cause underlying the stimulatory effect of al has not been fully understood. to investigate the possible role of al in growth induction, we studied morphological, physiological as well as biochemical changes of tea plant under different al concentrations (0-4,0 ... | 2012 | 22850809 |
| green tea polyphenols for the protection against renal damage caused by oxidative stress. | green tea, prepared from the leaves of camellia sinensis l., is a beverage that is popular worldwide. polyphenols in green tea have been receiving much attention as potential compounds for the maintenance of human health due to their varied biological activity and low toxicity. in particular, the contribution of antioxidant activity to the prevention of diseases caused by oxidative stress has been focused upon. therefore, in this study, we investigated the effects of (-)-epigallocatechin 3-o-gal ... | 2012 | 22844338 |
| effect of different types of tea on streptococcus mutans: an in vitro study. | if tea can be shown to have an inhibitory effect on the growth of streptococcus mutans there can be a basis for using it as an agent for reducing caries. | 2013 | 22842248 |
| polymeric black tea polyphenols modulate the localization and activity of 12-o-tetradecanoylphorbol-13-acetate-mediated kinases in mouse skin: mechanisms of their anti-tumor-promoting action. | polymeric black tea polyphenols (pbps) have been shown to possess anti-tumor-promoting effects in two-stage skin carcinogenesis. however, their mechanisms of action are not fully elucidated. in this study, mechanisms of pbp-mediated antipromoting effects were investigated in a mouse model employing the tumor promoter 12-o-tetradecanoylphorbol-13-acetate (tpa). compared to controls, a single topical application of tpa to mouse skin increased the translocation of protein kinase c (pkc) from cytoso ... | 2012 | 22841871 |
| inhibition of listeria monocytogenes atcc 19115 on ham steak by tea bioactive compounds incorporated into chitosan-coated plastic films. | the consumer demands for better quality and safety of food products have given rise to the development and implementation of edible films. the use of antimicrobial films can be a promising tool for controlling l. monocytogenes on ready to eat products. the aim of this study was to develop effective antimicrobial films incorporating bioactive compounds from green and black teas into chitosan, for controlling l. monocytogenes atcc 19115 on vacuum-packaged ham steak. the effectiveness of these anti ... | 2012 | 22839307 |
| evaluation of anti-inflammatory effects of green tea and black tea: a comparative in vitro study. | the present study was conducted to evaluate and compare the anti-inflammatory effects of aqueous extracts of green tea and black tea leaves (camellia sinensis) against the denaturation of protein in vitro. the test extracts at different concentrations were incubated with egg albumin under controlled experimental conditions and subjected to determination of absorbance to assess the anti-inflammatory property. diclofenac sodium was used as the reference drug. the present results exhibited a concen ... | 2012 | 22837963 |
| green tea and its major polyphenol egcg increase the activity of oral peroxidases. | oral peroxidases (opo) consist mainly of salivary peroxidase and myeloperoxidase and are involved in oral defense mechanisms. salivary peroxidase is synthesized and secreted by salivary glands, whereas myeloperoxidase is found in polymorphonuclear leukocytes, which migrate into the oral cavity at gingival crevices. green tea is the world's second most popular drink after water. polyphenols are the most biologically active group of tea components. the purpose of our study was to elucidate the int ... | 2013 | 22836624 |
| coffee and black tea consumption and breast cancer mortality in a cohort of swedish women. | coffee and black tea contain a mixture of compounds that have the potential to influence breast cancer risk and survival. however, epidemiologic data on the relation between coffee and black tea consumption and breast cancer survival are sparse. | 2012 | 22836509 |
| black tea polyphenols reverse epithelial-to-mesenchymal transition and suppress cancer invasion and proteases in human oral cancer cells. | epithelial-to-mesenchymal transition (emt) in cancer cells is considered to be a prerequisite for acquiring invasive/migratory phenotype and subsequent metastasis. this study provides molecular evidence associated with the antimetastatic effect of black tea polyphenol extracts (bte), which contain polyphenols including gallic acid, gallocatechin, catechin, epigallocatechin-3-gallate, epicatechin-3-gallate, and theaflavin 3,3'-digallate, in an an oral squamous cell culture system by showing a nea ... | 2012 | 22827697 |
| natural products: a safest approach for obesity. | obesity is recognized as a social problem, associated with serious health risks and increased mortality. numerous trials have been conducted to find and develop new anti-obesity drugs through herbal sources to minimize adverse reactions associated with the present anti-obesity drugs. the use of natural products as medicine has been documented for hundreds of years in various traditional systems of medicines throughout the world. this review focuses on the medicinal plants such as achyranthus asp ... | 2012 | 22821661 |
| l-theanine promotes nitric oxide production in endothelial cells through enos phosphorylation. | consumption of tea (camellia sinensis) improves vascular function and is linked to lowering the risk of cardiovascular disease. endothelial nitric oxide is the key regulator of vascular functions in endothelium. in this study, we establish that l-theanine, a non-protein amino-acid found in tea, promotes nitric oxide (no) production in endothelial cells. l-theanine potentiated no production in endothelial cells was evaluated using griess reaction, no sensitive electrode and a no specific fluoresc ... | 2013 | 22819553 |
| a six-month crossover chemoprevention clinical trial of tea in smokers and non-smokers: methodological issues in a feasibility study. | chemoprevention crossover trials of tea can be more efficient than parallel designs but the attrition and compliance rates with such trials are unknown. | 2012 | 22800470 |
| nutritional and functional characteristics of seven grades of black tea produced in turkey. | seven grades of black tea [high-quality black tea (grades 1-3) and low-quality black tea (grades 4-7)], processed by çaykur tea processing plant (rize, turkey), were examined for their proximate composition, dietary fiber, minerals, and water-soluble vitamins as well as total phenolic content, various antioxidant assays, phenolics (flavanols, alkoloids, condensed phenolics, and phenolic acids), chlorophylls, and carotenoids. some variations, albeit to different extents, were observed (p < 0.05) ... | 2012 | 22800200 |
| tea consumption is inversely associated with weight status and other markers for metabolic syndrome in us adults. | tea (camellia sinensis) is a widely consumed beverage, and laboratory and some intervention studies have indicated the potential health benefits of hot tea. the present study examines the association between tea consumption (evaluating hot and iced tea independently) and markers for metabolic syndrome adults in a sample of 6,472 who participated in the 2003-2006 national health and nutrition examination surveys. | 2013 | 22777108 |
| evaluation of black tea polyphenol extract against the retrogradation of starches from various plant sources. | the effects of black tea polyphenol extract (btpe) on the retrogradation of starches from different plant sources were studied using differential scanning calorimetry (dsc) and x-ray diffraction (xrd). dsc analysis shows that the gelatinization temperature of maize starch and starches from different rice varieties increased with increasing btpe level. after storage at 4 °c, btpe at a concentration of 15% markedly retarded the retrogradation of maize starch and starches from different rice variet ... | 2012 | 22772810 |
| the use of teetaimed in estonia, 1880s-1990s. | this research contributes to a better understanding of the criteria used for the selection of plants for making beverages. worldwide, not only the leaves of camellia sinensis, but also various other plants are used for making tea. we argue that the selection of plants for making tea (in estonian teetaimed) depends on specific features possessed by or attributed to the plants. 54 plant taxa and one lichen were identified as being used for making tea, based on the analysis of estonian historical h ... | 2012 | 22772044 |
| [comparison of the mechanism of cardiotonic action of the fraction 3 of mai-bao and digoxin on rat isolated heart]. | mai-bao (mb) is a beverage obtained by fermentation of sweet camellia sinensis tea by the tea-mushroom treasure. the action of the chromatographic fraction 3 of mai-bao (mb-f3) is cardiotonic. | 2011 | 22765949 |
| construction of cdna library and preliminary analysis of expressed sequence tags from tea plant [camellia sinensis (l) o. kuntze]. | tea is the most popular non-alcoholic and healthy beverage across the world. the understanding of the genetic organization and molecular biology of tea plant, which is very poorly understood at present, is required for quantum increase in productivity and efficient use of germplasm for either cultivation or breeding program. single-pass sequencing of randomly selected cdna clones is the most widely accepted technique for gene identification and cloning. in the present study, a good quality cdna ... | 2012 | 22759521 |
| effect of mangrove tea extract from ceriops decandra (griff.) ding hou. on salivary bacterial flora of dmba induced hamster buccal pouch carcinoma. | the objective of this study was to investigate the effects of mangrove tea on salivary bacterial flora in dmba induced hamster buccal pouch carcinoma. tea from mangrove plant ceriops decandra was administered against dmba induced buccal pouch carcinoma in hamster rats. the chemical constitutions and quality of mangrove tea is similar with the commercial tea camellia sinensis. the hamster rats were painted thrice a week with dmba in their right buccal pouch, and also administrated orally with 1.2 ... | 2011 | 22754013 |
| inhibition of uvb-induced nonmelanoma skin cancer: a path from tea to caffeine to exercise to decreased tissue fat. | oral administration of green tea, black tea, or caffeine (but not the decaffeinated teas) inhibited ultraviolet b radiation (uvb)-induced skin carcinogenesis in skh-1 mice. studies with caffeine indicated that its inhibitory effect on the atr/chk1 pathway is an important mechanism for caffeine's inhibition of uvb-induced carcinogenesis. the regular teas or caffeine increased locomotor activity and decreased tissue fat. in these studies, decreased dermal fat thickness was associated with a decrea ... | 2013 | 22752580 |
| inhibition of eph receptor-ephrin ligand interaction by tea polyphenols. | tea contains a variety of bioactive chemicals, such as catechins and other polyphenols. these compounds are thought to be responsible for the health benefits of tea consumption by affecting the function of many cellular targets, not all of which have been identified. in a high-throughput screen for small molecule antagonists of the epha4 receptor tyrosine kinase, we identified five tea polyphenols that substantially inhibit epha4 binding to a synthetic peptide ligand. further characterization of ... | 2012 | 22750215 |
| black tea polyphenols induce human leukemic cell cycle arrest by inhibiting akt signaling: possible involvement of hsp90, wnt/β-catenin signaling and foxo1. | tea polyphenols have potent biological activities against human cancer cells. a major causative factor in malignancies is disregulation of cell-cycle kinetics. in this study, we observed that black tea polyphenols, theaflavins (tf) and thearubigins (tr) induced cell-cycle arrest at the g(0) /g(1) phase in human leukemic u937 and k562 cells. our objective was to understand the underlying molecular mechanism of cell-cycle inhibition by tf and tr. during elucidation, we observed that both tf and tr ... | 2012 | 22715906 |
| evaluation of oral subchronic toxicity of pu-erh green tea (camellia sinensis var. assamica) extract in sprague dawley rats. | pu-erh green tea, originally produced in the yunnan province of p.r. china for about 1700 years, is believed to be beneficial to health in asian countries. the potential toxicity of pu-erh green tea when administered at high doses via concentrated extract, however, has not been completely investigated. | 2012 | 22710291 |
| regular black tea habit could reduce tobacco associated ros generation and dna damage in oral mucosa of normal population. | tobacco and tea habit are very common in world wide. in the present study, an attempt was made to evaluate the effect of regular drinking of black tea on reactive oxygen species (ros) generation and dna damage in buccal cells of normal subjects with or without tobacco habit. expression of ros associated proteins iκb, nf-κb as well as dna repair associated proteins p53, mlh1 were also analyzed. exfoliated buccal cells were collected from 308 healthy individuals and classified according to age, to ... | 2012 | 22705326 |
| hepatoprotective and antioxidant activity of standardized herbal extracts. | phyllanthus emblica, camellia sinensis, mangifera indica, punica granatum, and acacia catechu have been shown to possess widespread pharmacological application against multitude of diseases namely cancer, diabetes, liver disorders, and oxidative stress. | 2012 | 22701284 |
| a minireview of analytical methods for the geographical origin analysis of teas (camellia sinensis). | chemical compositions in tea leaves are influenced by their growing surrounding, and the content of these components are related to the quality of teas. the determination of the concentration of chemical composition in teas will predict the ranking of teas and indicate the geographical origins. this overview concerns an investigation of analytical methods that are being used for the determination of the geographical origin of tea. the analytical approaches have been subdivided into three groups: ... | 2012 | 22698268 |
| tea consumption and the risk of overall and grade specific prostate cancer: a large prospective cohort study of scottish men. | tea may be a potentially modifiable and highly prevalent risk factor for the most common cancer in men, prostate cancer. however, associations between black tea consumption and prostate cancer in epidemiological studies have been inconsistent, limited to a small number of studies with small numbers of cases and short follow-up periods and without grade-specific information. we conducted a prospective cohort study of 6,016 men who were enrolled in the collaborative cohort study between 1970 and 1 ... | 2012 | 22697604 |
| simultaneous determination of procymidone, pyridaben and beta-cypermethrin residues in tea solution by gc-ecd. | a sensitive and effective method for the simultaneous quantitative determination of procymidone, pyridaben and beta-cypermethrin residues in tea solutions was developed and validated using a gas chromatograph (gc) equipped with an electron capture detector (ecd). the analysis of the three pesticides in tea solutions involved extraction with petroleum ether-ethyl acetate (3:1, v/v), cleanup using a florisil solid-phase extraction cartridge and subsequent determination by gc-ecd. recovery studies ... | 2016 | 22689906 |
| medicinal flowers. xxxiii. anti-hyperlipidemic and anti-hyperglycemic effects of chakasaponins i-iii and structure of chakasaponin iv from flower buds of chinese tea plant (camellia sinensis). | effects of principal saponins, chakasaponins i-iii, from the flower buds of camellia sinensis cultivated in fujian province, china on plasma triglyceride (tg) and glucose levels in olive oil or sucrose-loaded mice were examined. chakasaponins i-iii at 50 and 100 mg/kg significantly inhibited increases in plasma tg and glucose levels. furthermore, they prevented gastric emptying, suggesting that the former inhibitory effect is partly dependent on the inhibition of gastric emptying. in addition, t ... | 2012 | 22689407 |
| triterpene saponins with hyaluronidase inhibitory activity from the seeds of camellia sinensis. | the meoh extract of the seeds of camellia sinensis (l.) kuntze gave twelve new saponins (1-12) along with ten known saponins (13-22). these saponins (1-22) showed stronger hyaluronidase inhibitory activity than the positive control, rosmarinic acid. | 2012 | 22689399 |
| black tea and blood pressure: did the blood pressure fall or rise? | 2012 | 22688998 | |
| determination of theanine and gamma-aminobutyric acid in tea by high performance- liquid chromatography with precolumn derivatization. | a method of precolumn derivatization-high performance liquid chromatography (hplc) for the determination of theanine and gamma-aminobutyric acid (gaba) in tea was established. o-phthalaldehyde (opa) and n-acetyl-l-cysteine (nac) were chosen as the derivatization reagents. the effects of teapolyphenol (tp), proline (pro) and vitamin c (vc) on derivatization yields were investigated. the results indicated that vc not only stabilized the stock solution of opa, but also enhanced the yield of gaba de ... | 2012 | 22679834 |
| risk factors for multiple myeloma: a hospital-based case-control study in northwest china. | the distinctive racial/ethnic and geographic distribution of multiple myeloma (mm) suggests that both family history and environmental factors may contribute to its development. | 2012 | 22673750 |
| discoloration of manually fabricated resins and industrially fabricated cad/cam blocks versus glass-ceramic: effect of storage media, duration, and subsequent polishing. | this study determined the discoloration of five cad/cam resins, four manually polymerized resins, and glass-ceramic as control group. specimens were divided into three groups (n=300, n=30) to be stored in coffee, black tea and red wine (n=10). the discoloration was measured using a spectrophotometer after 1, 7, 29, 90, 180 days storage. all tested groups showed color change (δe) at all time points. the manually polymerized resin composites gd (gradia) and cm (cronmix k), and the cad/cam resin co ... | 2012 | 22673470 |
| herb-drug interactions: an overview of systematic reviews. | the aim of this overview of systematic reviews (srs) is to evaluate critically the evidence regarding interactions between herbal medicinal products (hmps) and synthetic drugs. | 2013 | 22670731 |
| green tea (camelia sinensis) mediated suppression of ige production by peripheral blood mononuclear cells of allergic asthmatic humans. | recent studies in our laboratory demonstrated the suppression of immunoglobulin e (ige) production by green tea extract (gte) in u266 cells. however, the effects of gte or one of its components (egcg) on ige production by human peripheral blood mononuclear cells (pbmc) are unknown. pbmc (1.5 × 10⁶) obtained from serum ige+, allergic asthmatic patients, were cultured ± gte (1-100 ng/ml) or purified egcg (0.5-50 ng/ml), and ige levels were determined on day 10 by enzyme-linked immunosorbent assay ... | 2012 | 22670643 |
| therapeutic attenuation of neuroinflammation and apoptosis by black tea theaflavin in chronic mptp/probenecid model of parkinson's disease. | neuroinflammation and apoptosis in the dopaminergic neurons of substantia nigra play an important role in the pathogenesis of experimental and clinical parkinson's disease (pd). this study focused on the possible anti-inflammatory and anti-apoptotic effects of theaflavin (tf), a black tea polyphenol against 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (mptp)-induced neurotoxicity in mice. c57bl/6 male mice were treated with 10 doses of mptp (25 mg/kg, s.c.) and probenecid (250 mg/kg, i.p.) for 3 ... | 2013 | 22669749 |
| tiadinil, a plant activator of systemic acquired resistance, boosts the production of herbivore-induced plant volatiles that attract the predatory mite neoseiulus womersleyi in the tea plant camellia sinensis. | plants respond with various defense mechanisms to pathogenic or herbivorous attack. some chemicals called plant activators that induce the plant defense response against pathogens have been commercially used to protect plants. here we studied the effects of tiadinil (tdl) on defense mechanisms against herbivores. tdl suppresses pathogenic fungi on tea leaves by inducing defense mechanisms. we used one of the major trophic systems in tea consisting of the herbivorous mite, tetranychus kanzawai, a ... | 2012 | 22669277 |
| effects of saponin extracts on air emissions from steers. | a series of experiments were conducted to quantify the effects of saponin extracts from quillaja saponaria molina (qs), yucca schidigera roezl ex ortgies (ys), and camellia sinensis (l.) kuntze (ts) on gaseous emissions from steers (bos taurus). during exp. 1, a control diet [c1, corn (zea mays l.) and corn silage basal diet] was compared with ys1 (c1 + 0.64% dietary dm of ys) and qs1 (c1 + 1.5% dietary dm of qs), with 4 replicates per treatment. during exp. 2, the control diet (c2, corn and cor ... | 2012 | 22665675 |
| evaluation of ultrasound and light sources as bleaching catalysts - an in vitro study. | to evaluate the efficacy of tooth bleaching with high concentration agents, varying the catalyst sources and exposure times. | 2012 | 22645732 |
| engineering the production of major catechins by escherichia coli carrying metabolite genes of camellia sinensis. | a mimicked biosynthetic pathway of catechin metabolite genes from c. sinensis, consisting of flavanone 3 hydroxylase (f3h), dihydroflavonol reductase (dfr), and leucoanthocyanidin reductase (lcr), was designed and arranged in two sets of constructs: (a) single promoter in front of f3h and ribosome-binding sequences both in front of dfr and lcr; (b) three different promoters with each in the front of the three genes and ribosome-binding sequences at appropriate positions. recombinant e. coli bl ( ... | 2012 | 22645428 |
| flavor characteristics of seven grades of black tea produced in turkey. | seven grades of black tea [high-quality black tea (grades 1-3) and low-quality black tea (grades 4-7)], processed by çaykur tea processing plant (rize, turkey), were compared for their differences in descriptive sensory analysis (dsa), aroma-active compounds (volatile compounds), and taste-active compounds (sugar, organic acid, and free amino acid compositions). ten flavor attributes such as 'after taste', 'astringency', 'bitter', 'caramel-like', 'floral/sweet', 'green/grassy', 'hay-like', 'malt ... | 2012 | 22642545 |
| evaluation of soluble oxalates content in infusions of different kinds of tea and coffee available on the polish market. | tea and coffee are the potentially rich source of oxalic acid, which can act as a antinutrient. | 2012 | 22642066 |
| theaflavin ameliorates behavioral deficits, biochemical indices and monoamine transporters expression against subacute 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (mptp)-induced mouse model of parkinson's disease. | evidence from clinical and experimental studies indicates that degeneration of nigrostriatal dopaminergic neurons is a pathological hallmark of parkinson's disease (pd). the present study was designed to investigate the neuroprotective potential of theaflavin (tf) on oxidative stress, monoamine transporters and behavioral abnormalities in 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (mptp)-induced neurodegeneration. tf, a black tea polyphenol, has been known to possess neuroprotective effects ag ... | 2012 | 22634505 |
| polyphenolic compounds are novel protective agents against lipid membrane damage by α-synuclein aggregates in vitro. | cumulative evidence now suggests that the abnormal aggregation of the protein α-synuclein (αs) is a critical factor in triggering neurodegeneration in parkinson's disease (pd). in particular, a fundamental pathogenetic mechanism appears to involve targeting of neuronal membranes by soluble oligomeric intermediates of αs, leading to their disruption or permeabilisation. therefore, a model assay was developed in which fluorophore-loaded unilamellar vesicles were permeabilised by soluble oligomers, ... | 2012 | 22634381 |
| effects of sodium fluoride on dna, rna and protein contents in liver of mice and its amelioration by camellia sinensis. | 2013 | 22594270 | |
| hypoglycemic and antilipidemic properties of kombucha tea in alloxan-induced diabetic rats. | diabetes has become a serious health problem and a major risk factor associated with troublesome health complications, such as metabolism disorders and liver-kidney dysfunctions. the inadequacies associated with conventional medicines have led to a determined search for alternative natural therapeutic agents. the present study aimed to investigate and compare the hypoglycemic and antilipidemic effects of kombucha and black tea, two natural drinks commonly consumed around the world, in surviving ... | 2012 | 22591682 |
| phenotyping studies to assess the effects of phytopharmaceuticals on in vivo activity of main human cytochrome p450 enzymes. | the extensive use of herbal drugs and their multiple components and modes of action suggests that they may also cause drug interactions by changing the activity of human cytochrome p450 enzymes. the purpose of the present review is to present the available data for the top 14 herbal drug sales in the u. s. studies describing the effects of herbal drugs on phenotyping substrates for individual cyps were identified by a comprehensive medline search. drugs included allium sativum (liliaceae), echin ... | 2012 | 22588833 |
| optimizing the orosensory properties of model functional beverages: the influence of novel sweeteners, odorants, bitter blockers, and their mixtures on (+)-catechin. | the use of flavor-modifying strategies are important to improving the sensory profile of some excessively bitter and astringent functional ingredients, such as (+)-catechin (cat). two bitter blockers (ß-cyclodextrin [cyclo], homoeriodictyol sodium salt [hed]), two sweeteners (sucrose [suc], rebaudioside a [reb]), and two odorants (vanillin [van], black tea aroma [tea]) were assessed for their efficacy at modifying the bitterness and astringency of cat in model aqueous solutions. the intensity of ... | 2012 | 22582876 |
| effect of salt treatment on theanine biosynthesis in camellia sinensis seedlings. | theanine synthetase (ts) is an enzyme involved in theanine biosynthesis in tea plants. recent studies have revealed that theanine biosynthesis, derived from nitrogen metabolism in tea (camellia sinensis l.) plants, could be influenced by salt treatment. we have characterized csts at the molecular and biochemical level. the expression pattern of csts protein was examined by western blot using a self-prepared polyclonal antibody with high specificity and sensitivity. the effect of salt treatment o ... | 2012 | 22579942 |
| slimquick™ - associated hepatotoxicity in a woman with alpha-1 antitrypsin heterozygosity. | green tea (camellia sinensis)-associated hepatotoxicity is reported. however, the presence of alpha-1 antitrypsin mz phenotype as a predisposing factor to green tea-associated drug-induced liver injury (dili) is unknown. a previously healthy woman with alpha-1 antitrypsin mz phenotype who took slimquick™, an herbal supplement containing green tea extract, developed severe hepatotoxicity requiring corticosteroid treatment. green tea-associated hepatotoxicity is reviewed and alpha-1 antitrypsin mz ... | 2012 | 22567188 |
| identification of drought tolerant progenies in tea by gene expression analysis. | understanding the genes that govern tea plant (camellia sinensis) architecture and response to drought stress is urgently needed to enhance breeding in tea with improved water use efficiency. field drought is a slow mechanism and the plants go through an adaptive process in contrast to the drastic changes of rapid dehydration in case of controlled experiments. we identified a set of drought responsive genes under controlled condition using ssh, and validated the identified genes and their patter ... | 2012 | 22562548 |
| [quality of sleep in students]. | sleep quality is an important factor involved in students' learning process. using different methods, actual studies suggest that complaints about sleep problems are common in young medical students. the aim of this study was to evaluate if is any relation between factors like medium and lifestyle among students of the university of medicine and pharmacy "grigore t popa" from iaşi. the study group included 30 students (2 of them were excluded) who performed a polisomnography, self reported epwor ... | 2015 | 22545485 |
| a shared response of thaumatin like protein, chitinase, and late embryogenesis abundant protein3 to environmental stresses in tea [camellia sinensis (l.) o. kuntze]. | drought poses a significant threat to tree plants including tea [camellia sinensis (l.) o. kuntze] that yields a popular beverage "tea." consequence of drought is heat and salt stress, for which data on molecular response in tree species are not available. the present work analyzed drought-responsive subtracted cdna libraries of tea to identify drought-responsive genes. temporal and spatial gene expression suggested the involvement of chaperones as one of the major mechanisms to protect the plan ... | 2012 | 22543414 |
| csnam-like protein encodes a nuclear localized protein and responds to varied cues in tea [camellia sinensis (l.) o. kuntze]. | abiotic stress possesses serious threat to plant distribution and production. in response to stress, plants induce the expression of many genes that function to protect the cellular machinery from stress-induced damages. these genes are largely regulated by specific transcription factors (tfs). nac family proteins are plant specific tfs implicated in diverse processes including development, and biotic and abiotic stress responses. the present work described (i) cloning of csnam-like protein gene ... | 2012 | 22543018 |
| pyridine metabolism in tea plants: salvage, conjugate formation and catabolism. | pyridine compounds, including nicotinic acid and nicotinamide, are key metabolites of both the salvage pathway for nad and the biosynthesis of related secondary compounds. we examined the in situ metabolic fate of [carbonyl-(14)c]nicotinamide, [2-(14)c]nicotinic acid and [carboxyl-(14)c]nicotinic acid riboside in tissue segments of tea (camellia sinensis) plants, and determined the activity of enzymes involved in pyridine metabolism in protein extracts from young tea leaves. exogenously supplied ... | 2012 | 22527843 |
| in vitro anti-influenza virus and anti-inflammatory activities of theaflavin derivatives. | the theaflavins fraction (tf80%, with a purity of 80%) and three theaflavin (tf) derivatives from black tea have been found to exhibit potent inhibitory effects against influenza virus in vitro. they were evaluated with a neuraminidase (na) activity assay, a hemagglutination (ha) inhibition assay, a real-time quantitative pcr (qpcr) assay for gene expression of hemagglutinin (ha) and a cytopathic effect (cpe) reduction assay. the experimental results showed that they all exerted significant inhi ... | 2012 | 22521753 |
| a review of phytotherapy of acne vulgaris: perspective of new pharmacological treatments. | this review focuses on plants currently used and those with a high potency for the future development of anti-acne products. | 2012 | 22521501 |
| exposure to specific herbal products during pregnancy and the risk of low birth weight. | despite the fact that herbal products (hp) are used frequently during gestation worldwide, studies indicate that they may not be free of danger for fetuses. evidence about the safety of hp use during pregnancy and their impact on pregnancy outcomes is currently lacking. | 2015 | 22516883 |
| the effects of green tea polyphenols on drug metabolism. | tea, made from the dried leaves of the plant camellia sinensis theaceae, is a very popular beverage consumed worldwide. recently, green tea extract-based dietary supplements have also been widely consumed for the acclaimed beneficial health effects, such as weight reduction. although tea consumption is considered to be innocuous, the potential interactions between tea polyphenols and drugs have been demonstrated in studies in vitro and in vivo. | 2012 | 22509899 |
| maldi-tof mass spectrometry: avoidance of artifacts and analysis of caffeine-precipitated sii thearubigins from 15 commercial black teas. | thearubigins are the quantitatively major phenolic compounds in black tea, accounting for some 60-70% of the solids in a typical black tea infusion. maldi-tof mass spectra for caffeine-precipitated sii thearubigins (sii ctrs) from 15 different commercial teas support previous conclusions that sii ctrs are polyhydroxylated oligomers (rather than polymers) of catechins and catechin gallates in redox equilibrium with their quinone counterparts. some 4500 peaks were revealed in a mass range from m/z ... | 2012 | 22509842 |
| antiobesity effects of chinese black tea (pu-erh tea) extract and gallic acid. | the antiobesity effects of chinese black tea (pu-erh tea) and of gallic acid (ga) were investigated using in vitro and in vivo assays. chinese black tea extract (bte) and ga inhibited pancreatic lipase activity in a dose-dependent manner in vitro; the ic(inhibitory concentration)(50) values were 101.6 and 9.2 µg/ml, respectively. black tea extract (50, 100 mg/kg body weight (b.w.)) and ga (15, 45 mg/kg b.w.) significantly suppressed the elevation of blood triglyceride after oral administration o ... | 2011 | 22508359 |
| mining for ssrs and fdms from expressed sequence tags of camellia sinensis. | simple sequence repeats (ssrs) developed from expressed sequence tags (ests), known as est-ssrs are most widely used and potentially valuable source of gene based markers for their high levels of crosstaxon portability, rapid and less expensive development. the est sequence information in the publicly available databases is increasing in a faster rate. the emerging computational approach provides a better alternative process of development of ssr markers from the ests than the conventional metho ... | 2012 | 22493533 |
| in vivo evaluation of black and green tea dermal products against uv radiation. | aqueous extracts of black and green tea (camellia sinensis) were obtained by freeze-drying for this study. the extracts were evaluated based on tea quality control tests, uv, ir scans, and in vitro antioxidant capacity tests. dermal products from the tea extracts were designed and manufactured. black and green tea gels were tested in vivo in the forearms of six subjects using an artifical uv (200-400 nm) source. the tested formulations were green tea gel, black tea gel, 0.3% caffeine gel, carbom ... | 2010 | 22491240 |
| structural annotation and elucidation of conjugated phenolic compounds in black, green, and white tea extracts. | advanced analytical approaches consisting of both lc-ltq-orbitrap fourier transformed (ft)-ms and lc-time-of-flight-(tof)-ms coupled to solid-phase extraction (spe) nmr were used to obtain more insight into the complex phenolic composition of tea. on the basis of the combined structural information from (i) accurate mass fragmentation spectra, derived by using lc-orbitrap ftms(n), and (ii) proton nmr spectra, derived after lc-tofms triggered spe trapping of selected compounds, 177 phenolic compo ... | 2012 | 22468624 |
| effects of ilex latifolia and camellia sinensis on cholesterol and circulating immune complexes in rats fed with a high-cholesterol diet. | hypercholesterolaemia is one of the risk factors for atherosclerosis and subsequent cardiovascular disease. here, we investigated the effects of dietary supplementation with ilex latifolia or green tea (camellia sinensis) on the levels of plasma total cholesterol, high-density lipoprotein cholesterol and circulating immune complexes in sprague dawley rats fed with a high-cholesterol diet. we demonstrated that daily administration by gavage of i. latifolia or c. sinensis at doses of 1.0 or 2.0 g/ ... | 2013 | 22451380 |