Publications
| Title | Abstract | Year Filter | PMID(sorted descending) Filter |
|---|
| [pancreatic cancer and lifestyle factors]. | pancreatic cancer is a serious cancer with unfavorable prognosis. due to differences in the incidence of pancreatic cancer in different regions, it is clear that factors associated with lifestyle play an important role in the etiology. the aim of this study was to evaluate the impact of selected lifestyle factors in relation to pancreatic cancer. | 2013 | 23961856 |
| xerophilic aflatoxigenic black tea fungi and their inhibition by elettaria cardamomum and syzygium aromaticum extracts. | black tea is consumed worldwide and is believed to play a role in cancer prevention. xerophilic aflatoxigenic fungi are highly hazardous contaminants of tea since they are associated with tea quality impairment and human health risk. the present study reports isolation of such xerophilic and aflatoxigenic fungi associated with marketed tea. twenty different tea samples collected from the local markets of tamilnadu, india were investigated for fungal contamination. the results indicated contamina ... | 2011 | 23961151 |
| green tea (camellia sinesis) ameliorates female schistosoma mansoni-induced changes in the liver of balb/c mice. | this study was designed to assess the effect of green tea, an aqueous extract of camellia sinensis, on the oxidative stress, antioxidant defense system and liver pathology of schistosoma mansoni-infected mice. green tea at concentration of 3% (w/v) was given orally to treated mice as sole source of drinking water from the end of the 4th week to the end of 10th week post-infection; untreated mice were allowed to drink normal water. the data of the studied s. mansoni-infected mice exhibited a supp ... | 2011 | 23961148 |
| influences of crude extract of tea leaves, camellia sinensis, on streptozotocin diabetic male albino mice. | natural remedies from medicinal plants are considered to be effective and safe alternative treatment for diabetes mellitus. the aim of the present study was to investigate the hypoglycemic activity of the crude tea leaves extract on streptozotocin (stz)-induced diabetic mice. the average body weight of animals with diabetes and their percentage changes of body weight gain after 15 and 30 days were significantly lower than that of the normal control mice. in diabetic mice, supplementation with te ... | 2010 | 23961092 |
| does adding milk to tea delay gastric emptying? | many preoperative fasting guidelines suggest that hot tea or coffee with milk added should be considered similar to solid food, allowing an interval of 6 h before commencing anaesthesia. there is little evidence to support these instructions, with recent guidelines undecided on the issue. this study aimed to establish whether there was a clinically significant delay in gastric emptying associated with adding a modest amount of milk to tea. | 2014 | 23959782 |
| bacterial and fungal communities in pu'er tea samples of different ages. | pu'er is a major kind of postfermented tea and is made with a "large leaf" variety of camellia sinensis (c. sinensis assamica), whose distribution is limited to the mountains of southern yunnan, china. the quality of pu'er tea is believed to increase with storage (aging, maturing) because of postfermentation by microbes. the effect of storage period (from < 1 to 192 mo) on the bacteria and fungi in pu'er tea was investigated by a culture-dependent and a pcr-dgge method. the individual numbers of ... | 2013 | 23957415 |
| [chemical constituents of camellia sinensis var. assamica]. | to study the chemical constituents of camellia sinensis var. assamica. the compounds were isolated by nka macroporous resin silica gel, sephadex lh-20, rp-c18 column chromatographies and semi-preparative hplc,and their structures were elucidated by physicochemical properties and spectral analysis. thirteen compounds were isolated and identified as caffeine (1), theobromine (2), gallic acid (3), (+)-catechin (4), ampelopsin (5), (-)-epicatechin (6), (-)-epiafzelechin (7), (-)-epicatechin-3-o-gall ... | 2013 | 23944074 |
| black tea high-molecular-weight polyphenol stimulates exercise training-induced improvement of endurance capacity in mouse via the link between ampk and glut4. | aerobic exercise can promote "fast-to-slow transition" in skeletal muscles, i.e. an increase in oxidative fibers, mitochondria, and myoglobin and improvement in glucose and lipid metabolism. here, we found that mice administered mitochondria activation factor (maf) combined with exercise training could run longer distances and for a longer time compared with the exercise only group; maf is a high-molecular-weight polyphenol purified from black tea. furthermore, maf intake combined with exercise ... | 2013 | 23922719 |
| estimated dietary intakes and sources of flavanols in the german population (german national nutrition survey ii). | data from intervention studies suggest a beneficial effect of flavanols on vascular health. however, insufficient data on their intake have delayed the assessment of their health benefits. the aim of this study was to estimate intake of flavanols and their main sources among people living in germany. | 2014 | 23917449 |
| medicinal plant extracts variously modulate susceptibility of escherichia coli to different antibiotics. | antioxidant activity of green and black tea and extracts of medicinal plants and their ability to modulate antibiotic susceptibility in escherichia coli were studied. among a number of extracts tested the maximal capacity to scavenge dpph radicals and chelate iron in chemical tests was found in green and black tea, arctostaphylos uva-ursi and vaccinium vitis-idaea. these extracts contained high level of polyphenols and in aerobic conditions exhibited prooxidant features, producing h2o2 and induc ... | 2014 | 23916388 |
| dynamic changes in catechin levels and catechin biosynthesis-related gene expression in albino tea plants (camellia sinensis l.). | tea (camellia sinensis (l.) o. kuntze) leaves are a major source of flavonoids that mainly belong to the flavan-3-ols or catechins and are implicated in a wide range of health benefits. although the catechins in tea leaves were identified long ago, the regulatory mechanisms governing catechin biosynthesis remain unclear. in the present work, the dynamic changes of catechin levels and the expression profiles of catechin-related genes in albino tea plants were intensively examined. the amounts of ... | 2013 | 23911731 |
| amelioration of iron toxicity: a mechanism for aluminum-induced growth stimulation in tea plants. | tea plants (camellia sinensis) are well adapted to acid soils with high al availability. these plants not only accumulate high leaf al concentrations, but also respond to al with growth stimulation. decreased oxidative stress has been associated with this effect. why tea plants not exposed to al suffer from oxidative stress has not been clarified. in this study, hydroponically grown tea plants treated with 0 to 300 μm al were analyzed for growth, al and fe accumulation, and al distribution by me ... | 2013 | 23910825 |
| effect of kombucha, a fermented black tea in attenuating oxidative stress mediated tissue damage in alloxan induced diabetic rats. | diabetic complications associated with increased oxidative stress can be suppressed by antioxidants. in the present study we investigated the antidiabetic and antioxidant effects of kombucha (kt), a fermented black tea, in comparison to that of unfermented black tea (bt), in alx-induced diabetic rats. alx exposure lowered the body weight and plasma insulin by about 28.12% and 61.34% respectively and elevated blood glucose level and glycated hb by about 3.79 and 3.73 folds respectively. the oxida ... | 2013 | 23907022 |
| advanced phytochemical analysis of herbal tea in china. | herbal tea is a commonly consumed beverage brewed from the leaves, flowers, seeds, fruits, stems and roots of plants species rather than camellia sinensis l., which has been widely used for health care and diseases prevention for centuries. with the increasing consumption of herbal tea, a number of public health issues e.g., efficacy, safety and quality assurance have attracted concern. however, to date, there is no a review focus on herbal tea. phytochemical analysis, as a key step to investiga ... | 2013 | 23906802 |
| comparison of the dissipation behaviour of three neonicotinoid insecticides in tea. | the dissipation behaviour of three neonicotinoids - thiamethoxam, imidacloprid and acetamiprid - was compared in tea shoots, in chinese green and black tea, and after tea infusion in hot water. the simple and rapid analytical procedures for the quantification of these three residues in these matrices were developed using hplc with ultraviolet (uv) detection. degradation rates in tea shoots of neonicotinoids applied in either recommended or double dosages followed first-order kinetics, with half- ... | 2013 | 23906092 |
| antimicrobial activity of green tea extract against isolates of methicillin-resistant staphylococcus aureus and multi-drug resistant pseudomonas aeruginosa. | to evaluate antibacterial activity of the indonesian water soluble green tea extract, camellia sinensis, against clinical isolates of methicillin-resistant staphylococcus aureus (s. aureus) (mrsa) and multi-drug resistant pseudomonas aeruginosa (mdr-p. aeruginosa). | 2013 | 23905026 |
| effect of repeated wuniu early tea administration on the cyp450 activity using a cocktail method. | wuniu early tea (camellia sinensis) is an important beverage consumed in china. up to date, a lot of methods for identifying and chemical analysing have been done. however, there is no report on the effects of wuniu early tea on cytochrome p450 isozymes. therefore, the present objective of our study was to evaluate the potential effects of wuniu early tea on cytochrome p450 isozymes p2c9, p1a2, p2c19 and p2b6 in rats with a cocktail approach including, matching probe drugs of tolbutamide, phenac ... | 2013 | 23901167 |
| effects of lifestyle and genetic polymorphisms on consumption of coffee or black tea and urinary caffeine levels. | to find the cause of individual differences in caffeine intake and its metabolism, we investigated the effects of lifestyle and genetic polymorphisms of caffeine metabolic enzymes on coffee or black tea and urinary caffeine levels among 259 male japanese. it was seen that cigarette smokers drank more coffee or black tea than non-smokers (p < 0.001). there was an inverse correlation between the amount of coffee or black tea consumed and age or the frequency of alcohol drinking (p < 0.05). genetic ... | 1998 | 23899363 |
| [application of black tea as a negative oral contrast in magnetic resonance cholangiopancreatography (mrcp)]. | to investigate the feasibility of using black tea as a gastrointestinal oral negative contrast agent to null the signal from fluid in bowel during mr cholangiopancreatography (mrcp). | 2013 | 23898539 |
| treatment of oral mucositis in hematologic patients undergoing autologous or allogeneic transplantation of peripheral blood stem cells: a prospective, randomized study with a mouthwash containing camelia sinensis leaf extract. | oral mucositis is an important side effect of hematopoietic stem cell transplantation (hcst), mainly due to toxicity of conditioning regimens. it produces significant pain and morbidity. the present study reports a prospective, randomized, non-blinded study testing the efficacy of a new mouthwash, called baxidil onco(®) (sanitas farmaceutici srl, tortona, italy) in 60 hematologic patients undergoing hcst (28 autologous, 32 allogeneic). baxidil onco(®), used three times a day from day -1 to day + ... | 2013 | 23888242 |
| chromatographic analysis of methylglyoxal and other α-dicarbonyls using gas-diffusion microextraction. | many α-dicarbonyl compounds such as methylglyoxal, diacetyl and pentane-2,3-dione are important quality markers of processed foods. they are produced by enzymatic and chemical processes, the maillard reaction is the most known chemical route for α-dicarbonyl formation. in the case of methylglyoxal, there are obstacles to be overcome when analysing this compound due to its high reactivity, low volatility and low concentration. the use of extraction techniques based on the volatilization of methyl ... | 2013 | 23883921 |
| neurobiological effects of the green tea constituent theanine and its potential role in the treatment of psychiatric and neurodegenerative disorders. | theanine (n-ethylglutamic acid), a non-proteinaceous amino acid component of green and black teas, has received growing attention in recent years due to its reported effects on the central nervous system. it readily crosses the blood-brain barrier where it exerts a variety of neurophysiological and pharmacological effects. its most well-documented effect has been its apparent anxiolytic and calming effect due to its up-regulation of inhibitory neurotransmitters and possible modulation of seroton ... | 2014 | 23883567 |
| in vitro hypoglycaemic and hypolipidemic potential of white tea polyphenols. | the leaves at different processing stages of a single tea cultivar in order to obtain white (wt), green (gt) and black tea (bt) samples, were analysed. the capacities of tea polyphenolics to influence the glucose and lipid metabolism in hepg2 cell lines were evaluated. wt appeared the most active in reducing the glucose and cholesterol uptake (+17.7% and +32.4% in the glucose and cholesterol cell medium concentration, respectively). incubation with wt enhanced ldl receptor binding activity by 40 ... | 2013 | 23870971 |
| monitoring tea fermentation/manufacturing by direct analysis in real time (dart) mass spectrometry. | factors such as fermentation methods, geographical origin and season can affect the biochemical composition of tea leaves (camellia sinensis l.). in this study, the biochemical composition of oolong tea during the manufacturing and fermentation process was studied using a non-targeted method utilising ambient ionisation with a direct analysis in real time (dart) ion source and mass spectrometry (ms). caffeine dominated the positive ionisation spectra throughout the manufacturing process, while t ... | 2013 | 23870928 |
| the effect of camellia sinensis on wound healing potential in an animal model. | camellia sinensis (tea) is reported to have health benefits, including the building of healthy skin. this study evaluated the effects of topical application of camellia sinensis extract on the rate of wound closure and the histology of wound area. a uniform area of 2.00 cm in diameter was excised from the neck of adult male sprague dawley rats. the animals were topically treated with 0.2 ml of vehicle (cmc), intrasite gel (positive control), or 200 and 400 mg/ml of extract. wounds dressed with t ... | 2013 | 23864889 |
| screening of tea (camellia sinensis) for trait-associated molecular markers. | this study was done to identify random amplified polymorphic dna (rapd) markers that may associate with seven important traits in tea. sixty rapd primers were first screened using 18 cultivars under each of the 7 traits, followed by confirmatory screening of 20 promising primers with 32 tea cultivars. six rapd primers generated a total of nine specific bands that associated with six desired traits: black tea quality and tolerance to drought, high temperature, low temperature, phomopsis theae, an ... | 2013 | 23852798 |
| genoprotection and genotoxicity of green tea (camellia sinensis): are they two sides of the same redox coin? | regular intake of green tea associates with lower dna damage and increased resistance of dna to oxidant challenge. however, in vitro pro-oxidant effects of green tea have been reported. both effects could be mediated by hydrogen peroxide (h2o2) which is generated by autoxidation of tea catechins. in large amounts, h2o2 is genotoxic, but low concentrations could activate the redox-sensitive antioxidant response element (are) via the keap-1/nrf2 redox switch, inducing genoprotective adaptations. o ... | 2013 | 23849339 |
| green tea catechins: defensive role in cardiovascular disorders. | green tea, camellia sinensis (theaceae), a major source of flavonoids such as catechins, has recently shown multiple cardiovascular health benefits through various experimental and clinical studies. these studies suggest that green tea catechins prevent the incidence of detrimental cardiovascular events, and also lower the cardiovascular mortality rate. catechins present in green tea have the ability to prevent atherosclerosis, hypertension, endothelial dysfunction, ischemic heart diseases, card ... | 2013 | 23845542 |
| a comparative study of volatile components in green, oolong and black teas by using comprehensive two-dimensional gas chromatography-time-of-flight mass spectrometry and multivariate data analysis. | the difference of volatile components in green, oolong and black teas was studied by using comprehensive two-dimensional gas chromatography-time-of-flight mass spectrometry (gc×gc-tofms). simultaneous distillation extraction was proved to be a suitable technique to extract the analytes with interest. a total of 450 compounds were tentatively identified with comparison to the standard mass spectra in available databases, retention index on the first dimension and structured chromatogram. 33 tea s ... | 2013 | 23838302 |
| fuzhuanins a and b: the b-ring fission lactones of flavan-3-ols from fuzhuan brick-tea. | fuzhuan brick-tea is a special dark tea prepared from the leaves of camellia sinensis var. sinensis. its production involves a fungal fermentation stage, which forms the unique flavors and functions by a series of biochemical reactions. our phytochemical research of the material led to the isolation of two new b-ring fission lactones of flavan-3-ols, fuzhuanins a (1) and b (2). in addition, three other flavan-3-ol derivatives (3-5), three flavone c-glycosides (6-8), eight flavonoid o-glycosides ... | 2013 | 23837839 |
| compositional, nutritional, and functional characteristics of instant teas produced from low- and high-quality black teas. | two types of instant teas produced from low- and high-quality black teas were examined for their proximate composition, dietary fiber, minerals, water-soluble vitamins, total phenolic content, various antioxidant assays, phenolics (flavanols, condensed phenolics, and phenolic acids), alkaloids, and carotenoids as well as taste-active compounds (sugars, organic acids, and free amino acids). some variations, albeit to different extents, were observed (p < 0.05) among these parameters between insta ... | 2013 | 23837397 |
| a hair growth-promoting effect of chinese black tea extract in mice. | chinese black tea extract (cbte) fermented with aspergillus sp. significantly promoted hair growth after 2 weeks of topical application in shaved 6 week-old male c3h/he mice. the hair growth-promoting effect of cbte was potentiated synergistically by capsaicin, which has no effect on hair growth by itself. cbte displayed an affinity for estrogen receptor (er)α, with an ic50 value of 74.8 µg/ml. this effect of cbte might be mediated by the ers, since a similar effect induced by orally administere ... | 2013 | 23832356 |
| adsorption of methylene blue onto activated carbon produced from tea (camellia sinensis l.) seed shells: kinetics, equilibrium, and thermodynamics studies. | tea (camellia sinensis l.) seed shells, the main byproduct of the manufacture of tea seed oil, were used as precursors for the preparation of tea activated carbon (tac) in the present study. a high yield (44.1%) of tac was obtained from tea seed shells via a one-step chemical method using zncl2 as an agent. the brunauer-emmett-teller (bet) surface area and the total pore volumes of the obtained tac were found to be 1530.67 mg(2)/g and 0.7826 cm(3)/g, respectively. the equilibrium adsorption resu ... | 2013 | 23825151 |
| transgenic tobacco overexpressing tea cdna encoding dihydroflavonol 4-reductase and anthocyanidin reductase induces early flowering and provides biotic stress tolerance. | flavan-3-ols contribute significantly to flavonoid content of tea (camellia sinensis l.). dihydroflavonol 4-reductase (dfr) and anthocyanidin reductase (anr) are known to be key regulatory enzymes of flavan-3-ols biosynthesis. in this study, we have generated the transgenic tobacco overexpressing individually tea cdna csdfr and csanr encoding for dfr and anr to evaluate their influence on developmental and protective abilities of plant against biotic stress. the transgenic lines of csdfr and csa ... | 2013 | 23823500 |
| effect of increasing levels of zinc fortificant on the iron absorption of bread co-fortified with iron and zinc consumed with a black tea. | iron (fe) and zinc's (zn) interaction at the absorptive level can have an effect on the success of co-fortification of wheat flour with both minerals on iron deficiency prevention. the aim of the study was to determine the effect of increasing levels of zinc fortificant on the iron absorption of bread co-fortified with iron and zinc consumed with a black tea. twelve women aged 33-42 years participated in the study. they received on four different days 200 ml of black tea and 100 g of bread made ... | 2013 | 23821315 |
| mitochondrial membrane permeabilisation by amyloid aggregates and protection by polyphenols. | alzheimer's disease and parkinson's disease are neurodegenerative disorders characterised by the misfolding of proteins into soluble prefibrillar aggregates. these aggregate complexes disrupt mitochondrial function, initiating a pathophysiological cascade leading to synaptic and neuronal degeneration. in order to explore the interaction of amyloid aggregates with mitochondrial membranes, we made use of two in vitro model systems, namely: (i) lipid vesicles with defined membrane compositions that ... | 2013 | 23817009 |
| hplc-dad determination of seven antioxidants and caffeine in different phytopharmaceuticals. | a high-performance liquid chromatography method employing diode array detection was developed to determine levels of the major catechins, proanthocyanidin (procyanidin b2), caffeine, thymoquinone and carvacrol and its isomer, thymol, which are present in different natural complex matrices found in commercial products of camellia sinensis l. and/or nigella sativa l. reversed-phase separation was performed on a c18 column by using gradient elution by varying the proportions of solvent a (distilled ... | 2014 | 23811048 |
| classification of tea category using a portable electronic nose based on an odor imaging sensor array. | a developed portable electronic nose (e-nose) based on an odor imaging sensor array was successfully used for classification of three different fermentation degrees of tea (i.e., green tea, black tea, and oolong tea). the odor imaging sensor array was fabricated by printing nine dyes, including porphyrin and metalloporphyrins, on the hydrophobic porous membrane. a color change profile for each sample was obtained by differentiating the image of sensor array before and after exposure to tea's vol ... | 2013 | 23810847 |
| inducing apoptosis of cancer cells using small-molecule plant compounds that bind to grp78. | glucose regulated protein 78 (grp78) functions as a sensor of endoplasmic reticulum (er) stress. the aim of this study was to test the hypothesis that molecules that bind to grp78 induce the unfolded protein response (upr) and enhance cell death in combination with er stress inducers. | 2013 | 23807168 |
| should we drink black tea without milk? | 2013 | 23802249 | |
| inclusivity, exclusivity and limit of detection of commercially available real-time pcr assays for the detection of salmonella. | the traditional cultural detection of salmonella spp. is both time- and labour-intensive. salmonella is often a release criterion for the food industry and time to result is therefore an important factor. storage of finished products and raw materials can be costly and may adversely impact available shelf-life. the application of real-time pcr for the detection of salmonella spp. in food samples enables a potential time-saving of up to four days. the advancement of real-time pcr coupled with the ... | 2013 | 23800733 |
| global transcriptome profiles of camellia sinensis during cold acclimation. | tea is the most popular non-alcoholic health beverage in the world. the tea plant (camellia sinensis (l.) o. kuntze) needs to undergo a cold acclimation process to enhance its freezing tolerance in winter. changes that occur at the molecular level in response to low temperatures are poorly understood in tea plants. to elucidate the molecular mechanisms of cold acclimation, we employed rna-seq and digital gene expression (dge) technologies to the study of genome-wide expression profiles during co ... | 2013 | 23799877 |
| synergistic effect of black tea and curcumin in improving the hepatotoxicity induced by aflatoxin b1 in rats. | aflatoxin b1 (afb1) is a toxic compound commonly found as a contaminant in human food. it is carcinogenic due its potential in inducing the oxidative stress and distortion of the most antioxidant enzymes. since black tea possesses strong antioxidant activity, it protects cells and tissues against oxidative stress. curcumin (cmn), a naturally occurring agent, has a combination of biological and pharmacological properties that include antioxidant activity. therefore, the present study was carried ... | 2015 | 23796760 |
| green tea as an effective antimicrobial for urinary tract infections caused by escherichia coli. | urinary tract infections (utis) are a very most common type of infection worldwide, and result in billions of dollars in medical care costs. escherichia coli is the infective agent for 80-90% of all utis. green tea, derived from leaves of the camellia sinensis plant has been shown to have various potential health benefits (e.g., cardiovascular disease and cancer). the major beneficial components of green tea have been characterized, and are now known to be polyphenolic catechins. the main catech ... | 2013 | 23785367 |
| green and black tea for the primary prevention of cardiovascular disease. | there is increasing evidence that both green and black tea are beneficial for cardiovascular disease (cvd) prevention. | 2013 | 23780706 |
| a systematic review of anti-obesity medicinal plants - an update. | obesity is the most prevalent health problem affecting all age groups, and leads to many complications in the form of chronic heart disease, diabetes mellitus type 2 and stroke. a systematic review about safety and efficacy of herbal medicines in the management of obesity in human was carried out by searching bibliographic data bases such as, pubmed, scopus, google scholar, web of science, and iranmedex, for studies reported between 30th december 2008 to 23rd april 2012 on human or animals, inve ... | 2013 | 23777875 |
| effect of black tea extract on herpes simplex virus-1 infection of cultured cells. | the purpose of this investigation was to determine if black tea extract (bte), consisting primarily of flavanol compounds called theaflavins, could inhibit herpes simplex virus type-1 (hsv-1) infection in cultured a549 (human epithelial) and vero cells. | 2013 | 23777309 |
| analysis of codon use features of stearoyl-acyl carrier protein desaturase gene in camellia sinensis. | the stearoyl-acyl carrier protein desaturase (sad) gene widely exists in all kinds of plants. in this paper, the camellia sinensis sad gene (cssad) sequence was firstly analyzed by codon w, chips, and cusp programs online, and then compared with genomes of the tea plant, other species and sad genes from 11 plant species. the results show that the cssad gene and the selected 73 of c. sinensis genes have similar codon usage bias. the cssad gene has a bias toward the synonymous codons with a and t ... | 2013 | 23774066 |
| discrimination of oolong tea (camellia sinensis) varieties based on feature extraction and selection from aromatic profiles analysed by hs-spme/gc-ms. | this study aimed to develop an objective and accurate analytical method to discriminate oolong tea varieties that easily causing adulteration by potential volatile compounds. a total of 75 oolong tea samples of five similar varieties (tieguanyin, benshan, maoxie, huangjingui and jinguanyin) were analysed by headspace solid phase microextraction (hs-spme) coupled with gas chromatography-mass spectrometry (gc-ms). the relative content of 26 major volatile compounds varied significantly according t ... | 2013 | 23768356 |
| color stability of different composite resin materials. | data are needed to better predict the color stability of current composite resin materials. | 2013 | 23763782 |
| optimisation of supercritical carbon dioxide extraction of essential oil of flowers of tea (camellia sinensis l.) plants and its antioxidative activity. | to extract natural volatile compounds from tea (camellia sinensis) flowers without thermal degradation and residue of organic solvents, supercritical fluid extraction (sfe) using carbon dioxide was employed to prepare essential oil of tea flowers in the present study. four important parameters--pressure, temperature, static extraction time, and dynamic extraction time--were selected as independent variables in the sfe. | 2014 | 23754602 |
| black tea and blood pressure: did the blood pressure fall or rise?-reply. | 2012 | 23752673 | |
| black tea, green tea and risk of breast cancer: an update. | previous meta-analysis indicated conflicting results in case-control versus cohort studies on the association of green tea with breast cancer risk, and conflicting results were also found in case-control versus cohort studies in another meta-analysis on the association of black tea with breast cancer risk. many studies were published after the previous meta-analysis. besides, the dose-response relationship of tea consumption with breast cancer risk is unclear. thus the association of tea consump ... | 2013 | 23750333 |
| what is under the hump? mass spectrometry based analysis of complex mixtures in processed food--lessons from the characterisation of black tea thearubigins, coffee melanoidines and caramel. | in this contribution we review our work on the characterisation of processed food. we review novel methods and analysis strategies developed to account for the composition of extraordinarily complex materials such as black tea thearubigins, coffee melanoidines and thermally treated carbohydrates. our methods are mainly based on modern mass spectrometry and are introduced and critically discussed. a series of novel previously unpublished data interpretation strategies are presented as well. final ... | 2013 | 23748630 |
| the use of green tea extract in cosmetic formulations: not only an antioxidant active ingredient. | green tea (gt) extracts contain polyphenols, known to be effective free radical scavengers, and other ingredients that could also provide benefits to the skin. this is a report on clinical studies using objective, noninvasive methods to evaluate the effects of cosmetic formulations containing gt. experimental formulations were supplemented or not (vehicle) with 6% camellia sinensis glycolic leaf extracts (gt). these formulations were applied to the forearm skin of 24 volunteers, and their effect ... | 2013 | 23742288 |
| phenolics metabolism in boron-deficient tea [camellia sinensis (l.) o. kuntze] plants. | modification in the metabolism of phenolic compounds under boron (b) deficiency conditions was studied in tea plants. plants were grown from seed, treated with low b in hydroponic medium under environmentally controlled conditions for six weeks. dry matter production and b content of plants were significantly declined under b deficiency conditions. boron starvation resulted in rising phenylalanine ammonia lyase activity in the young leaves and declining polyphenol oxidase activity in the roots. ... | 2013 | 23739888 |
| application of green zero-valent iron nanoparticles to the remediation of soils contaminated with ibuprofen. | zero-valent iron nanoparticles (nzvis) are often used in environmental remediation. their high surface area that is associated with their high reactivity makes them an excellent agent capable of transforming/degrading contaminants in soils and waters. due to the recent development of green methods for the production of nzvis, the use of this material became even more attractive. however, the knowledge of its capacity to degrade distinct types of contaminants is still scarce. the present work des ... | 2013 | 23738986 |
| copper induced oxidative stress in tea (camellia sinensis) leaves. | tea [camellia sinensis l. (o.) kuntze] is an economically important plantation crop of india but is prone to attack by several fungal pathogens. copper based fungicides are being used for decades to control fungal diseases in tea which may lead to accumulation of copper in the soil. the biochemical responses to increasing concentrations of copper (50 to 700 microm) were investigated in the leaves of two cultivars of tea commonly grown in the darjeeling hills. exposure to excess cu resulted in in ... | 2012 | 23734451 |
| tea consumption and the risk of oral cancer incidence: a case-control study from china. | to evaluate the relation of tea consumption with the risk of oral cancer incidence. | 2013 | 23731795 |
| comparative studies on the physicochemical and antioxidant properties of different tea extracts. | tea is one of the most popular drinks next to water. tea polyphenol is one of the main bioactive constituents of tea with health functions. in order to find the most bioactive tea polyphynols, polyphenol extracts from green tea, black tea and chemical oxidation products of green tea extracts were comparatively studied on the physicochemical and antioxidant properties. results showed physicochemical and antioxidant properties of polyphenol extracts changed greatly after the chemical oxidation. hy ... | 2011 | 23729856 |
| dietary flavonoid intake, black tea consumption, and risk of overall and advanced stage prostate cancer. | flavonoids are natural antioxidants found in various foods, and a major source is black tea. some experimental evidence indicates that flavonoids could prevent prostate cancer. we investigated the associations between flavonoid intake, black tea consumption, and prostate cancer risk in the netherlands cohort study, which includes 58,279 men who provided detailed baseline information on several cancer risk factors. from 1986 to 2003, 3,362 prostate cancers were identified, including 1,164 advance ... | 2013 | 23722011 |
| active extracts of black tea (camellia sinensis) induce apoptosis of pc-3 prostate cancer cells via mitochondrial dysfunction. | cancer of the prostate gland is the most common invasive malignancy and the second leading cause of cancer-related death in human males. many studies have shown that black tea reduces the risk of several types of cancer. we studied the effects of active extracts of black tea and the black tea polyphenols theaflavins (tfs), on the cellular proliferation and mitochondria of the human prostate cancer cell line pc-3. our studies revealed that yinghong black tea extracts (ybt), assam black tea extrac ... | 2013 | 23715786 |
| antimicrobial polyphenols from small tropical fruits, tea and spice oilseeds. | the polyphenolic fractions of fruits: terminalia catappa, carissa carandas, ziziphus nummularia; spice oilseeds: thymol, mustard, fenugreek and poppy seeds; and herb: green and black teas were analyzed for their total phenolics, flavonoids and antimicrobial potential. all fractions from fruits, except anthocyanin of c. carandas, displayed substantial antibacterial activity in accordance to their phenolic contents, the difference in activity being quite significant (p < 0.05), highest for t. cata ... | 2014 | 23703103 |
| effect of tea (camellia sinensis) and olive (olea europaea l.) leaves extracts on male mice exposed to diazinon. | the present study was aimed to evaluate the effects of tea and olive leaves extracts and their combination in male mice intoxicated with a sublethal concentration of diazinon. exposure of mice to 6.5 mg/kg body weight of diazinon for seven weeks resulted in statistical increases of serum alanine aminotransferase, aspartate aminotransferase, gamma glutamyl transferase, alkaline phosphatase, creatine kinase, creatinine, glucose, triglycerides, and cholesterol, while the value of serum total protei ... | 2013 | 23691503 |
| zinc modulates drought-induced biochemical damages in tea [camellia sinensis (l) o kuntze]. | zinc (zn) is an essential micronutrient that affects the growth and productivity of tea plant. drought stress causes various biochemical and physiological damages in plants. the present study aims at understanding the role of zn in modulating drought stress induced growth and biochemical damages in tea plant. the results of the present investigation demonstrated that drought-induced decrease in relative water content (rwc), dry mass of leaf, and antioxidants such as ascorbate and glutathione in ... | 2013 | 23682650 |
| ethosomes in hair dye products as carriers of the major compounds of black tea extracts. | this study describes a novel carrier, the ethosome-based system, which is composed of non-ionic surfactants, ethanol, and water. | 2013 | 23676188 |
| prevalence, awareness and risk factors of hypertension in a large cohort of iranian adult population. | there is considerable variation in hypertension prevalence and awareness, and their correlates, across different geographic locations and ethnic groups. we performed this cross-sectional analysis on data from the golestan cohort study (gcs). | 2013 | 23673348 |
| a review on botanical species and chemical compounds with appetite suppressing properties for body weight control. | as obesity has reached epidemic proportions, the management of this global disease is of clinical importance. the availability and popularity of natural dietary supplements for the treatment of obesity has risen dramatically in recent years. the purpose of this paper was to review the effect of commonly available over the counter plant-derived supplements used to suppress appetite for obesity control and management. the data were obtained from the electronic databases pubmed, springerlink, googl ... | 2013 | 23666454 |
| [a case-control study on tea consumption and the risk of lung cancer]. | to investigate the association between tea consumption and lung cancer. | 2013 | 23654095 |
| cross-sectional and longitudinal associations of lifestyle factors with depressive symptoms in ≥ 53-year old taiwanese - results of an 8-year cohort study. | the objective of this study is to determine the concurrent and longitudinal associations of lifestyle factors including smoking, alcohol drinking, betel quid chewing, tea (camellia sinensis) drinking and physical activity with depressive symptoms in older taiwanese. | 2013 | 23651861 |
| bioactive-rich sideritis scardica tea (mountain tea) is as potent as camellia sinensis tea at inducing cellular antioxidant defences and preventing oxidative stress. | in several countries, tea (hot-water infusions of dried camellia sinensis (cs) leaves) is a major source of antioxidant flavonoids, and its consumption has been associated with several favourable outcomes. other plants used for the preparation of herbal teas are sources of phenolic antioxidant compounds; among them sideritis scardica (ss) is used for the preparation of a popular drink throughout eastern and central europe. we have compared the effects of an ss extract to a cs extract in hepg2 ce ... | 2013 | 23649594 |
| tissue-specific, development-dependent phenolic compounds accumulation profile and gene expression pattern in tea plant [camellia sinensis]. | phenolic compounds in tea plant [camellia sinensis (l.)] play a crucial role in dominating tea flavor and possess a number of key pharmacological benefits on human health. the present research aimed to study the profile of tissue-specific, development-dependent accumulation pattern of phenolic compounds in tea plant. a total of 50 phenolic compounds were identified qualitatively using liquid chromatography in tandem mass spectrometry technology. of which 29 phenolic compounds were quantified bas ... | 2013 | 23646127 |
| prevention of chronic diseases by tea: possible mechanisms and human relevance. | tea, made from leaves of the plant camellia sinensis, theaceae, has been used by humans for thousands of years, first as a medicinal herb and then as a beverage that is consumed widely. for the past 25 years, tea has been studied extensively for its beneficial health effects, including prevention of cancer, reduction of body weight, alleviation of metabolic syndrome, prevention of cardiovascular diseases, and protection against neurodegenerative diseases. whether these effects can be produced by ... | 2013 | 23642203 |
| possible adverse reactions to herbal products: a study with individuals who resort to popular medicine in the city of diadema, sp, brazil. | the present study aimed to investigate the occurrence of adverse reactions (adrs) related to herbal products (hps), which are purchased over-the-counter for self-treatment, reported by 100 users. samples of the hps related to those adrs were purchased for their pharmacobotanical identification. the adrs reported were evaluated based on specialized literature and were analyzed according to causality into probable (pr), possible (po), unrelated (ur) or unclassifiable (uc); according to expectance ... | 2014 | 23640707 |
| effect of emulsification on the skin permeation and uv protection of catechin. | an anti-aging effect may be obtained by skin application of tea catechins (camellia sinensis) since they have high ultraviolet (uv)-protection activity. in this study, the skin permeation of catechin (c), epicatechin (ec), epigallocatechin (egc), epicatechin gallate (ecg) and epigallocatechin gallate (egcg) was determined and compared, and the effect of emulsification on the skin permeation of c was measured. the uv-protective effect of c was also determined. the in vitro skin permeability of ea ... | 2014 | 23639253 |
| correlation between catechin content and nf-κb inhibition by infusions of green and black tea. | this study investigates whether infusions of green and black tea inhibit the nf-κb driven transcription in human epithelial gastric ags cells. water extracts were prepared from different brands of green and black tea available on the italian market. teas with or without caffeine were studied. an industrially prepared freeze-dried water extract of green tea was also tested. catechin and caffeine contents were measured by hplc analysis. the decrease in phenol and catechin content three months afte ... | 2013 | 23636906 |
| antibacterial, antiadherence, antiprotease, and anti-inflammatory activities of various tea extracts: potential benefits for periodontal diseases. | porphyromonas gingivalis is a key etiologic agent of chronic periodontitis. this gram-negative anaerobic bacterium produces several virulence factors and can induce a host inflammatory response that contributes to periodontal disease. in the present study, we investigated green tea, white tea, oolong tea, and black tea extracts with a high polyphenol content for their effects on (i) the growth and adherence of p. gingivalis, (ii) the activity of host and bacterial proteases, and (iii) cytokine s ... | 2013 | 23631500 |
| neurochemical and behavioral effects of green tea (camellia sinensis): a model study. | being rich in polyphenolic compounds such as flavonoids, green tea is suggested to be a potential candidate for the treatment of obesity, stress, depression, parkinson's and other disorders. since serotonin has an important role in the pathophysiology of these disorders, present study was designed to monitor the effects of green tea in rats. green tea extract was provided to the male albino wistar rats for 5 weeks, and effects on behaviors were monitored. results show a decrease in food intake a ... | 2013 | 23625424 |
| protective effects of keemun black tea polysaccharides on acute carbon tetrachloride-caused oxidative hepatotoxicity in mice. | this study was designed to investigate chemical characterization of the water-soluble polysaccharides extracted from keemun black tea (kbtp), and their antioxidant and hepatoprotective effects against ccl4-induced oxidative damage in mice. hplc analysis revealed that kbtp is the typical acidic heteropolysaccharides and consisted of nine monosaccharides. furthermore, kbtp showed highly ferric-reducing antioxidant power and scavenging effects against dpph, oh and o2(-) in vitro. administration of ... | 2013 | 23623843 |
| chemical composition, plant secondary metabolites, and minerals of green and black teas and the effect of different tea-to-water ratios during their extraction on the composition of their spent leaves as potential additives for ruminants. | this study characterized the chemical composition of green and black teas as well as their spent tea leaves (stl) following boiling in water with different tea-to-water ratios. the green and black tea leaves had statistically similar (g/kg dry matter (dm), unless stated otherwise) dm (937 vs 942 g/kg sample), crude protein (240 vs 242), and ash (61.8 vs 61.4), but green tea had significantly higher (g/kg dm) total phenols (231 vs 151), total tannins (204 vs 133), condensed tannins (176 vs 101), ... | 2013 | 23621359 |
| two new oleanane-type triterpenes isolated from japanese post-fermented tea produced by anaerobic microbial fermentation. | four triterpenes were isolated from a traditional japanese tea product produced by anaerobic microbial fermentation of heated green tea leaves (camellia sinensis). two of the compounds were novel and characterized by spectroscopic investigation to be 13,26-epoxy-3β,11α-dihydroxyolean-12-one and 3β,11α,13β-trihydroxyolean-12-one. two known triterpenes were identified as taraxastane-3β,20β-diol and taraxastane-3β,20α-diol. these triterpenes were not detected in the original green tea leaves. | 2013 | 23615533 |
| impact of thearubigins on the estimation of total dietary flavonoids in the european prospective investigation into cancer and nutrition (epic) study. | thearubigins (tr) are polymeric flavanol-derived compounds formed during the fermentation of tea leaves. comprising ∼70% of total polyphenols in black tea, tr may contribute majorly to its beneficial effects on health. to date, there is no appropriate food composition data on tr, although several studies have used data from the us department of agriculture (usda) database to estimate tr intakes. we aimed to estimate dietary tr in the european prospective investigation into cancer and nutrition ( ... | 2013 | 23612513 |
| mycomon-monitoring project of toxigenic fungi in food in years 1999 - 2001. | an occurrence of the toxigenic fungi producing aflatoxins and ochratoxin a in food was investigated in the study ("mycomon") in years 1999-2001. twenty five commodities were purchased from retail in twelve collection places in the czech republic (300 food samples together). the presence of potentially toxigenic fungiaspergillus flavus was observed in 28% of the sampled food (black pepper, black tea, caraway seeds, fine flour, fruit tea, oat flakes) in the year 1999, in 17% of the sampled food (b ... | 2002 | 23606161 |
| occurrence of the toxigenic fungi (producers of aflatoxins and ochratoxin a) in foodstuffs in the czech republic 1999-2000. | the occurrence of toxigenic fungi producing aflatoxins and ochratoxin a in foodstuffs was studied in the czech republic. twenty five commodities were collected at twelve collection places in the czech republic (300 food samples). the presence of potentially toxigenicaspergillus flavus was observed in 28% of the sampled foods (black pepper, caraway seeds, fruit tea, black tea, oat flakes, fine flour, rolled oat flakes and semolina) in the year 1999, and in 25% of the sampled foods (black pepper, ... | 2001 | 23605869 |
| development of tea extracts and chitosan composite films for active packaging materials. | the effects of 0.5%, 1% and 2% green tea extracts (gte) and black tea extracts (bte) on the physical, structural and antioxidant properties of chitosan films were investigated. results showed that the addition of tea extracts significantly decreased water vapour permeability and increased the antioxidant ability of films. the dpph radical scavenging ability of gte films was stronger than that of bte films in all food simulants (0%, 20%, 75% and 95% ethanol). the equilibration time in different f ... | 2013 | 23603075 |
| evaluation of reproductive and developmental toxicities of pu-erh black tea (camellia sinensis var. assamica) extract in sprague dawley rats. | pu-erh black tea, which is obtained by first parching crude green tea leaves and followed by secondary fermentation with microorganisms, has been believed to be beneficial beverages for health in pr china. but its potential toxicity when administered at a high dose as concentrated extract has not been completely investigated. | 2013 | 23602733 |
| cross-sectional dietary deficiencies among a prison population in papua new guinea. | to investigate the dietary adequacy of prisoners of beon prison, madang, papua new guinea in response to a report of possible nutritional deficiency. | 2013 | 23601963 |
| effects of selected bioactive natural products on the vascular endothelium. | the endothelium, a highly active structure, regulates vascular homeostasis through the release of numerous vasoactive factors that control vascular tone and vascular smooth cell proliferation. a larger number of medicinal plants and their isolated chemical constituents have been shown to beneficially affect the endothelium. for example, flavonoids in black tea, green tea, and concord grape cause a vasodilation possibly through their antioxidant properties. allicin, a by-product of the enzyme all ... | 2013 | 23599064 |
| selective speciation of inorganic antimony on tetraethylenepentamine bonded silica gel column and its determination by graphite furnace atomic absorption spectrometry. | a speciation system for antimony (iii) and antimony (v) ions that based on solid phase extraction on tetraethylenepentamine bonded silica gel has been established. antimony was determined by graphite furnace atomic absorption spectrometry (gf-aas). analytical conditions including ph, sample volume, etc., were studied for the quantitative recoveries of sb (iii) and sb (v). matrix effects on the recovery were also investigated. the recovery values and detection limit for antimony (iii) at optimal ... | 2013 | 23598207 |
| dose-response plasma appearance of green tea catechins in adults. | tea is an infusion of the camellia sinensis leaves. the most prevalent bioactive compounds in green tea are catechins (c), which are of great interest for their potential health-promoting effects. however, metabolism and bioavailability of c are not fully understood. | 2013 | 23589502 |
| inhibition of camellia sinensis (l.) o. kuntze on microcystis aeruginosa and isolation of the inhibition factors. | low concentration of tea (camellia sinensis (l.) o. kuntze) was shown to inhibit the growth of the toxic cyanobacterium microcystis aeruginosa. the inhibition efficiency was 40% at 0.1 g dry tea/l and 90% at 0.2 g/l after a 12-day culture. all varieties of tea used in the test could inhibit microcystis growth, in which the inhibitory effect of green tea was greater than that of black tea. antialgal allelochemicals were isolated from tea by solvent extraction, gel-chromatography and high performa ... | 2013 | 23584804 |
| flavonol glycosides with lipid accumulation inhibitory activity and simultaneous quantitative analysis of 15 polyphenols and caffeine in the flower buds of camellia sinensis from different regions by lcms. | a simultaneous quantitative analytical method for 15 major polyphenols, e.g. five catechins (1-5) and 10 flavonols (6-15), as functional constituents in the extracts of "tea flowers", the flower buds of camellia sinensis (theaceae), has been developed. the content of caffeine (16), which showed similar chromatographic behaviour under the analytical conditions, was also determined. to approve the validity of the newly developed protocol, thirteen extracts of the plant's flower buds collected from ... | 2013 | 23578653 |
| inhibitory effects of tea extract on aflatoxin production by aspergillus flavus. | aflatoxins, one of the most carcinogenic substances, have been implicated as a potential threat to the safety of tea beverages. in this study, we studied the inhibitory effects of the aqueous extracts from several chinese traditional teas, such as green tea, black tea, flower tea, raw puer tea (naturally fermented puer tea) and puer tea (inoculated puer tea), on the growth and aflatoxin production of aspergillus flavus. all the tested extracts inhibited the production of aflatoxin b1, whereas th ... | 2013 | 23573983 |
| clonal variation of tea [camellia sinensis (l.) o. kuntze] in countering water deficiency. | various clones of tea [camellia sinensis (l.) o. kuntze] such as ttl-1, ttl-2, ttl-4, ttl-5, ttl-6, upasi-2 and upasi-3 planted in the field were subjected to soil moisture stress conditions by withholding irrigation. a control set of the same clones were maintained by watering regularly. the soil water content of the irrigated and non irrigated plants was monitored through the soil moisture status. the extent of effect of drought on tea plants were monitored through various physiological parame ... | 2010 | 23572986 |
| comparative assessment of tea quality by various analytical and sensory methods with emphasis on tea polyphenols. | attempts were made to evolve an efficient technique for quality assessment of tea (camellia sinensis) using a tyrosinase based biosensor to detect polyphenols (pp). tyrosinase catalyzes the polymerization of pp to form theaflavins (tf) and thearubigins (tr) contributing to the colour and astringency of tea, which determine tea quality. variation in biosensor response of tea infusions gave an indication of differential amount of tf and tr. a comparative study of quality attributes of 8 varieties ... | 2011 | 23572768 |
| isolation and identification of salmonella from curry samples and its sensitivity to commercial antibiotics and aqueous extracts of camelia sinensis (l.) and trachyspermum ammi (l.). | to isolate salmonella from curry samples and to evaluate the drug sensitivity of the food-borne salmonella and its susceptibility to specific plant extracts. | 2011 | 23569772 |
| black tea lowers the rate of blood pressure variation: a randomized controlled trial. | measures of blood pressure variation have been associated with cardiovascular disease and related outcomes. the regular consumption of black tea can lower blood pressure, but its effects on blood pressure variation have yet to be investigated. | 2013 | 23553154 |
| effect of different brewing times on soluble oxalate content of loose-packed black teas and tea bags. | because of the postulated role of increased dietary oxalate intake in calcium oxalate stone formation, the effect of different brewing times on soluble oxalate contents of loose-packed black tea and tea bags was studied. the oxalate content of 25 different samples of loose-packed black teas after brewing at 5, 10, 15, 30, and 60 min and of ten brands of tea bags after infusion for 1, 2, 3, 4, and 5 min was measured by enzymatic assay. the oxalate concentration resulting from different brewing ti ... | 2012 | 23532418 |
| chemopreventive and therapeutic potential of tea polyphenols in hepatocellular cancer. | the prophylactic and therapeutic properties of tea have been attributed to green tea catechins and black tea theaflavins besides several other polyphenolic compounds. tea polyphenols possess potent antioxidant and antiinflammatory properties and modulate several signaling pathways. these biochemical facets of tea polyphenols are responsible for its anticancer properties. several lethal cancers, such as liver cancer, develop within a background of oxidative stress and inflammation. liver cancer, ... | 2013 | 23530632 |
| analysis of the inhibition of pai-1 by metal theaflavin complexes and their degradation products. | the inhibition of elements of the plasminogen activator system [urokinase (upa), tissue plasminogen activator (tpa) and plasminogen activator inhibitor-1 (pai-1)] plays an important role in human diseases. pai-1 is overexpressed in obesity and diabetes, and the inhibition of this protein has been postulated to alleviate the symptoms of both disorders. we found that two theaflavins (tfs) from black tea inhibit pai-1 and we suggest that the beneficial effects of drinking tea may be associated with ... | 2013 | 23525250 |