Publications
| Title | Abstract | Year Filter | PMID(sorted ascending) Filter |
|---|
| [relationship between plant community succession and fertility variation of mountain yellow soil in east chongqing]. | based on the analyses of soil physical and chemical properties, this paper studied the relationship between plant community succession and fertility variation of mountain yellow soil in east chongqing. the results showed that the values of integrated soil fertility index of pinus massoniana, cunninghamia lanceolata, deciduous oak, camellia sinensis and evergreen broad-leaved forest soils were 0.1256, 0.2085, 0.3514, 0.2479 and 0.9329, respectively, implying that soil development had a close rela ... | 2005 | 15852912 |
| effects of structure on radical-scavenging abilities and antioxidative activities of tea polyphenols: nmr analytical approach using 1,1-diphenyl-2-picrylhydrazyl radicals. | tea (camellia sinensis) leaves contain various antioxidants such as ascorbic acid (1) and polyphenols. this study tries to clarify the molecular mechanisms underlying the antioxidative and radical-scavenging activities of these antioxidants, and the reactivities of each antioxidant have been compared against that of the stable free radical 1,1-diphenyl-2-picrylhydrazyl (dpph, 2) using nuclear magnetic resonance (nmr) analysis. catechol (3) and (+)-taxifolin (4) were oxidized to o-quinone by 2. h ... | 2005 | 15853407 |
| black and green teas equally inhibit diabetic cataracts in a streptozotocin-induced rat model of diabetes. | green and black teas were given at 1.25% in the drinking water to streptozotocin-induced diabetic rats for 3 months. normal and diabetic control groups were also studied. as expected, diabetic animals had significantly increased glucose in lens and plasma. lens and red blood cell sorbitol were significantly increased as a result of the aldose reductase pathway activation. plasma and lens lipid thiobarbituric acid-reactive substances and protein glycation were also significantly elevated. both te ... | 2005 | 15853424 |
| [thermostabilities of plant phenol oxidase and peroxidase, determining the technology of their use in food industry]. | stabilities of phenol oxidase and peroxidase from tea plant (camellia sinensis l.) clone kolkhida leaves, apple (malus domestica l.) cultivar kekhura fruits, walnut (juglans regia l.) green pericarp, and horseradish (armoracia lapathifolia gilib) roots were studied using different storage temperature modes and storage duration. it was demonstrated that both enzymes retained residual activities (approximately 10%) upon 20-min incubation at 80 degrees c. phenol oxidases from tea, walnut, and, espe ... | 2006 | 15859458 |
| meal-based intake assessment tool: relative validity when determining dietary intake of fe and zn and selected absorption modifiers in uk men. | a computer-based dietary assessment tool, the meal-based intake assessment tool (mbiat), is described. in the current study, dietary intakes of fe and zn fractions (total fe, non-haem fe, haem fe, meat fe, total zn) and dietary components that influence fe and zn absorption (vitamin c, phytate, ca, grams of meat/fish/poultry, black tea equivalents, phytate:zn molar ratio) were assessed. the relative validity of the mbiat was determined in forty-eight uk men aged 40 years and over by comparing it ... | 2005 | 15877881 |
| ilex paraguariensis extracts are potent inhibitors of nitrosative stress: a comparative study with green tea and wines using a protein nitration model and mammalian cell cytotoxicity. | due to the increasing importance of nitrosative stress in pathology and the efficacy displayed by flavonoids in cancelling the effects of peroxynitrite, we decided to conduct a comparative study of three commonly used beverages with the highest polyphenol contents and proven antioxidant properties: mate (ilex paraguariensis); green tea (camelia sinensis) extracts and white and red wines of the main varietals. we directly evaluated and compared the extracts and wines as protein nitration inhibito ... | 2005 | 15878361 |
| p38 mitogen-activated protein kinase activates enos in endothelial cells by an estrogen receptor alpha-dependent pathway in response to black tea polyphenols. | black tea has been shown to improve endothelial function in patients with coronary artery disease and recent data indicate the polyphenol fraction of black tea enhances endothelial nitric oxide synthase (enos) activity through p38 map kinase (p38 mapk) activation. because the mechanisms for this phenomenon are not yet clear, we sought to elucidate the signaling events in response to black tea polyphenols. bovine aortic endothelial cells (baecs) exposed to black tea polyphenols demonstrated enos ... | 2005 | 15879307 |
| black tea induces tumor cell apoptosis by bax translocation, loss in mitochondrial transmembrane potential, cytochrome c release and caspase activation. | recently the anti-cancer role of black tea has gained immense importance. nevertheless, the signaling pathways underlying black tea-induced tumor cell death are still unknown. previously we reported that black tea induces ehrlich's ascites carcinoma (eac) cell apoptosis by changing the balance between pro-and anti-apoptotic proteins. it is now well accepted that many cell death pathways converge at the mitochondria to decrease mitochondrial transmembrane potential (mtp) thereby releasing apoptog ... | 2005 | 15880367 |
| pesticide-induced alteration in mice hepato-oxidative status and protective effects of black tea extract. | this study investigates the role of black tea extract in protection against oxidative damage induced in mice by a subacute oral dose of a combination of pesticides. | 2005 | 15885683 |
| differential display-mediated identification of three drought-responsive expressed sequence tags in tea [camellia sinensis (l.) o. kuntze]. | there is no information on drought-modulated gene(s) in tea [camellia sinensis (l.) o. kuntze], a woody and perennial plant of commercial importance. using differential display of mrna, three drought-modulated expressed sequence tags (ests) were identified. northern and blast analysis revealed that clone dr1 (drought-responsive), induced only by drought but not by aba, showed significant scores with pr-5 (pathogenesis related) family of pr-protein gene. another clone dr2, repressed by drought bu ... | 2005 | 15886459 |
| heteroactivation of cytochrome p450 1a1 by teas and tea polyphenols. | we studied 7-ethoxyresorufin deethylase as an index of cytochrome p4501a1 (cyp1a1) activity in liver microsomes from rats pretreated with 3-methylcholanthrene. the enzyme had complex kinetics compatible with a multisite model. at 1 microm substrate, brewed black, green and white teas had complex effects on enzyme activity consisting of activation at low concentrations and inhibition at higher concentrations. data fit well to a two-site model that allowed us to determine maximal activation (% inc ... | 2005 | 15895106 |
| occurrence of vitamin b12 in green, blue, red, and black tea leaves. | vitamin b12 contents of green (0.046-0.263 and 0.125-0.535 microg/100 g dry weight), blue (0.068-0.081 and 0.525-0.528 microg/l00 g dry weight), red (0.061 and 0.663 microg/100 g dry weight), and black (0.104-0.859 and 0.305-1.20 microg/100 dry weight) tea leaves were obtained by intrinsic factor-chemiluminescence and microbiological methods, respectively. although vitamin b12 was found in all tea leaves tested by both assay methods, the higher values by the microbiological method were not due t ... | 2004 | 15895521 |
| variations of main quality components of tea genetic resources [camellia sinensis (l.) o. kuntze] preserved in the china national germplasm tea repository. | the variations of the main quality components of tea, tea polyphenols, catechins, amino acids, caffeine, and water extract of 596 accessions chinese tea genetic resources, preserved in the china national germplasm tea repository (cngtr), were analyzed. tea polyphenols content on a dry weight basis varied from 13.6 to 47.8%, averaging 28.4%. the tea polyphenols content increases gradually from northern and eastern provinces to southern provinces, the highest is in yunnan tea resources. the conten ... | 2005 | 15898357 |
| water deficit induced oxidative damage in tea (camellia sinensis) plants. | when the tea (camellia sinensis) leaf water potential was -1.1 mpa (moderate water deficit), there was 58% inhibition of photosynthesis accompanied by increased zeaxanthin, malondialdehyde, oxidized proteins and superoxide dismutase activity. when the leaf water potential was -2mpa (severe water deficit), there was nearly complete inhibition of photosynthesis apart from a decrease in chlorophylls, beta-carotene, neoxanthin and lutein. water deficit at this level caused further conversion of viol ... | 2005 | 15900883 |
| novel chemiluminescence-inducing cocktails, part ii: measurement of the anti-oxidant capacity of vitamins, thiols, body fluids, alcoholic beverages and edible oils. | using two luminescence-inducing cocktails, two distinct patterns of inhibition of light by different anti-oxidants have been identified, comprising group a, in which a complete inhibition of light emission which is then followed by re-emergence of light, forming apparent s-shaped curves or similar shapes. this light pattern is induced by the "classical" anti-oxidants, ascorbate, vitamin e, uric acid, thiols, deferoxamine, as well as by anti-oxidant agents present in plasma, saliva, urine and in ... | 2004 | 15901412 |
| black tea polyphenols suppress cell proliferation and induce apoptosis during benzo(a)pyrene-induced lung carcinogenesis. | one of the most promising strategies for cancer prevention is chemoprevention by daily used food and beverages. black tea, the most widely consumed beverage, is a source of compounds with antioxidative, antimicrobial, antimutagenic and anticarcinogenic properties. lung cancer is the most common cause of cancer deaths in both men and women worldwide. over one million people around the world are likely to be killed by lung cancer due to increased tobacco smoking and environmental pollutants, espec ... | 2005 | 15901989 |
| tea (camellia sinensis (l.) o. kuntze) clone with lower period of winter dormancy exhibits lesser cellular damage in response to low temperature. | there is no literature available on the response of tea plant to low temperature. we studied the effect of low temperature on two clones of tea with contrasting periods of winter dormancy, a phenomenon in which the growth of apical shoots of tea is diminished during winter months. clone 'teenali 17/154' (tnl) showed shorter periods of winter dormancy than clone 'kangra jat' (knj). low temperature (5 degrees c) resulted in increase of metabolic superoxide (o2*-) content and cellular damage (as me ... | 2005 | 15907690 |
| oxidation of tea extracts and tea catechins by molecular oxygen. | tea polyphenols (pp) are known as potent antioxidants. at the same time, pp have been repeatedly reported to oxidize by molecular oxygen with the formation of active forms of oxygen. in this work, the clark electrode technique was applied to study the kinetics of the autoxidation of tea extracts and individual tea pp as well as model pp, catechol, gallic acid, and pyrogallol. aqueous extracts of both green and black teas were found to undergo extensive autoxidation under physiological conditions ... | 2005 | 15913321 |
| inhibition of tumour promotion in mouse skin by extracts of rooibos (aspalathus linearis) and honeybush (cyclopia intermedia), unique south african herbal teas. | the modulating effect of ethanol/acetone (e/a) soluble fractions, prepared from methanolic extracts of processed and unprocessed rooibos (aspalathus linearis) and honeybush (cyclopia intermedia) as well as green (camellia sinensis) teas was established in a two-stage mouse skin carcinogenesis assay. topical application of the tea fractions prior to the tumour promoter, 12-o-tetradecanoylphorbol-13-acetate (tpa), on icr mouse skin initiated with 7,12-dimethylbenz[a]anthracene (dmba) suppressed sk ... | 2004 | 15914270 |
| black tea theaflavins suppress dioxin-induced transformation of the aryl hydrocarbon receptor. | dioxins cause various adverse effects through transformation of aryl hydrocarbon receptor (ahr). in this study, we investigated whether black tea extract and its components, theaflavins, suppress ahr transformation in vitro. first, we confirmed that black tea extract strongly suppressed ahr transformation compared to green and oolong tea, although the catechin contents did not change significantly among the extracts. then we isolated four theaflavins as active compounds from black tea leaves. th ... | 2005 | 15914905 |
| inhibition of sars-cov 3c-like protease activity by theaflavin-3,3'-digallate (tf3). | sars-cov is the causative agent of severe acute respiratory syndrome (sars). the virally encoded 3c-like protease (3cl(pro)) has been presumed critical for the viral replication of sars-cov in infected host cells. in this study, we screened a natural product library consisting of 720 compounds for inhibitory activity against 3cl(pro). two compounds in the library were found to be inhibitive: tannic acid (ic(50) = 3 microm) and 3-isotheaflavin-3-gallate (tf2b) (ic(50) = 7 microm). these two compo ... | 2005 | 15937562 |
| novel inhibitors of fatty-acid synthase from green tea (camellia sinensis xihu longjing) with high activity and a new reacting site. | recent studies have shown that fas (fatty acid synthase) is a potential therapeutic target of obesity. in the present paper we report that extract of green tea (camellia sinensis xihu longjing) inhibits fas effectively with an ic50 value of 12.2 microg dry weight/ml. the ability of gte (green tea extract) to inhibit fas is more potent than that of two known inhibitors in green tea leaves, egcg (epigallocatechin gallate) and ecg (epicatechin gallate). we find that (-)-cg (catechin gallate) is a v ... | 2006 | 15943584 |
| purification and partial characterization of beta-glucosidase from fresh leaves of tea plants (camellia sinensis (l.) o. kuntze). | beta-glucosidases are important in the formation of floral tea aroma and the development of resistance to pathogens and herbivores in tea plants. a novel beta-glucosidase was purified 117-fold to homogeneity, with a yield of 1.26%, from tea leaves by chilled acetone and ammonium sulfate precipitation, ion exchange chromatography (cm-sephadex c-50) and fast protein liquid chromatography (fplc; superdex 75, resource s). the enzyme was a monomeric protein with specific activity of 2.57 u/mg. the mo ... | 2005 | 15944750 |
| determination of some organochlorine compounds in herbal colouring agent henna (lawsonia inermis) and in tea (thea sinensis). | henna (lawsonia inermis) has been used for centuries as a herbal hair and skin dye, but very little is known about its additives and contaminants that could adversely affect human health. an analytical method was developed to determine organochlorine compounds in henna, as they are still widely used in the areas where henna is grown. samples were sonicated with n-hexane, extracts cleansed on florisil sorbent and analysed using gas chromatography with electron capture detection. the overall recov ... | 2005 | 15969202 |
| [the green tea, a good choice for cardiovascular disease prevention?]. | tea (camellia sinensis) has been used for centuries as a medical drink. around two-thirds of the world's population drink tea. it is originated from southern china and entensive cultivated in asia and in central african countries. tea can be grouped into three main types, black, oolong, and green tea. green tea is not fermented and is a major beverage consumed in asian countries. green tea is produced from freshly harvest leaves of the tea plant and they contain water, proteins, carbohydrates, m ... | 2004 | 15969262 |
| molecular definition of black tea taste by means of quantitative studies, taste reconstitution, and omission experiments. | recently, bioresponse-guided fractionation of black tea infusions indicated that neither the high molecular weight thearubigens nor the theaflavins, but a series of 14 flavon-3-ol glycopyranosides besides some catechins, might be important contributors to black tea taste. to further bridge the gap between pure structural chemistry and human taste perception, in the present investigation 51 putative taste compounds have been quantified in a black tea infusion, and their dose-over-threshold (dot) ... | 2005 | 15969522 |
| about the cover illustration: thea sinensis - the common tea plant. | 2005 | 15976762 | |
| all teas are not created equal: the chinese green tea and cardiovascular health. | tea is one of the most widely consumed beverages in the world, next only to water. it can be categorized into three types, depending on the level of fermentation, i.e., green (unfermented), oolong (partially fermented) and black (fermented) tea. in general, green tea has been found to be superior to black tea in terms of antioxidant activity owing to the higher content of (-)-epigallocatechin gallate. the processes used in the manufacture of black tea are known to decrease levels of the monometr ... | 2006 | 15978686 |
| protective effect of black tea extract on the levels of lipid peroxidation and antioxidant enzymes in liver of mice with pesticide-induced liver injury. | sub-acute hepatotoxicity was induced in mice by exposure to pesticides. the effect of pretreatment with aqueous black tea extract on lipid peroxidation and antioxidants in the liver was investigated. administering a combination dose of chlorpyriphos and cypermethrin (20 mg kg(-1) each) on alternate days over a 15-day period to male mice resulted in induction of sub-acute toxicity as reflected by elevated levels of liver damage marker enzymes alkaline phosphatase(alp), aspartate transaminase(ast) ... | 2006 | 15991261 |
| medicinal benefits of green tea: part i. review of noncancer health benefits. | tea, in the form of green or black tea, is one of the most widely consumed beverages in the world. extracts of tea leaves also are sold as dietary supplements. however, with the increasing interest in the health properties of tea and a significant rise in scientific investigation, this review covers recent findings on the medicinal properties and noncancer health benefits of both green and black tea. in part ii, a review of anticancer properties of green tea extracts is presented. green tea cont ... | 2005 | 15992239 |
| phytoestrogenic effects of black tea extract (camellia sinensis) in an oophorectomized rat (rattus norvegicus) model of osteoporosis. | the adverse side effects of currently available anti-osteoporotic agents warrant the search for compounds with less toxic effects. in this study, we assessed the phytoestrogenic potentiality of whole aqueous extract of black tea (bte) in a bilaterally oophorectomized rat model (2.5%, 1 ml/100 g body weight/day for 28 days). although the supplementation was given for 28 days but, sign of revival of copulation period (estrous stage) from non-receptive diestrous stage was first noticed after 21 day ... | 2005 | 15996685 |
| epigallocatechin gallate (egcg) (teavigo) does not impair nonhaem-iron absorption in man. | a number of studies have shown that tea catechins can inhibit intestinal iron absorption, mostly iron in the nonhaem form. this randomized, double-blind, placebo-controlled, 3-periods cross-over study examined the degree of inhibition of nonhaem iron absorption by pure crystalline epigallocatechin gallate (egcg). the study was designed to show the maximum inhibitory action of egcg by selecting 30 healthy women with low iron stores. treatments were 150 mg, 300 mg egcg and placebo each for 8 conse ... | 2005 | 16008116 |
| addition of milk does not alter the antioxidant activity of black tea. | tea is a polyphenol-rich beverage like wine and catechins are its chief polyphenols. catechins have cardio-protective effects as they can scavenge free radicals and inhibit lipid peroxidation. epidemiological studies indicate an inverse relation between tea consumption and the risk of cardiovascular and other chronic diseases. addition of milk to black tea has been reported to adversely affect its beneficial effects, but the data are not unequivocal. therefore, we assessed the effect of the addi ... | 2005 | 16020939 |
| stability of black tea polyphenol, theaflavin, and identification of theanaphthoquinone as its major radical reaction product. | in the current study, we have focused on isolation and detection of major radical oxidation products from theaflavin in order to better understand antioxidation mechanisms of this compound. theanaphthoquinone was identified as a major oxidation product of theaflavin from two different oxidant model systems: dpph and peroxidase/hydrogen peroxide. this result indicated that the benzotropolone moiety in theaflavin may play an important role in its antioxidant properties. the stability of theaflavin ... | 2005 | 16029009 |
| cosmeceuticals containing herbs: fact, fiction, and future. | modern medicine is rooted in ethnobotanical traditions using indigenous flora to treat symptoms of human diseases or to improve specific aspects of the body condition. herbal medicine is now used by over half of the american population. yet the american medical community generally lacks knowledge of the function, metabolism, interaction, adverse reactions, and preparation of herbal products. | 2005 | 16029681 |
| [tea and coffee consumption among russian population]. | aim of present study was the getting data on black and green tea and coffee consumption among russian population in 1995-2003. the consumption of beverages tea and coffee was estimated by 24-hour recall of dietary intake in course of russian longitudinal monitoring surveys of economics and health. about 82% of population have consumed the black tea and only 2.2%--the green tea. mean daily black and green tea intake among all population were 446 ml and 10 ml, correspondingly. the prevalence of bl ... | 2005 | 16044841 |
| use of black tea in modulating clastogenic effects of arsenic in mice in vivo. | the concentration of arsenic in drinking water has far exceeded the permissible limit of 0.001 mg/l and has reached epidemic proportions, with a maximum of 3.7 mg/l in several districts of west bengal and in the adjoining bangladesh. because inorganic arsenic is a documented human carcinogen, arsenic in drinking water may cause 200,000-270,000 deaths per year from cancer in india alone. tea has a protective effect against the clastogenicity of arsenic. we investigated whether tea extracts could ... | 2005 | 16050804 |
| black tea extract can modulate protein expression of h-ras, c-myc, p53, and bcl-2 genes during pulmonary hyperplasia, dysplasia, and carcinoma in situ. | lung cancer has emerged as one of the leading causes of cancer death in most developed and many developing countries of the world. in the absence of effective screening and early detection methods of lung cancer and overall poor prognosis, the 5-year survival following treatment has not improved significantly over the last two decades. it is hoped that the risk of the disease can be minimized by preventive measures. one aspect of lung cancer prevention emphasizes the cessation of tobacco smoking ... | 2005 | 16050805 |
| supplementation of waste tea fungal biomass as a dietary ingredient for broiler chicks. | the waste tea fungal biomass produced during black tea fermentation was investigated as a dietary ingredient in poultry feeds. a small portion of fungal mat was used as starter culture for the next cycle while the major portion is discarded as waste. hence a trial study was carried out to utilize the waste fungal biomass as a supplementary diet for broiler chicks. the fungal biomass contained 179.38 g of crude protein, 120 g crude fibre, 4.82 g phosphorus, 6.56 g of calcium and 8.92 mj metaboliz ... | 2005 | 16051080 |
| seasonal variations of phenolic compounds in australia-grown tea (camellia sinensis). | seasonal variations of phenolic compounds in fresh tea shoots grown in australia were studied using an hplc method. three principal tea flavanols [epigallocatechin gallate (egcg), epicatechin gallate (ecg), and epigallocatechin (egc)] and four grouped phenolics [total catechins (cs), total catechin gallates (cgs), total flavanols (fla), and total polyphenols (pps)] in fresh tea shoots were analyzed and compared during the commercial harvest seasons from april 2000 to may 2001. the levels of egcg ... | 2005 | 16076137 |
| xanthine oxidase activity in vitro: effects of food extracts and components. | there is significant interest in the direct antioxidant activities of dietary polyphenols, due to associations between consumption of polyphenol-rich foods, such as fruits and vegetables, and decreased incidence of oxidative-stress related disease. however, indirect antioxidant action, such as the inhibition of ros-producing enzymes, may be equally relevant to health benefits through a general reduction in oxidative stress in vivo. to this end, the effects of food extracts and individual compoun ... | 2005 | 16076142 |
| inhibitory effects of various beverages on ritodrine sulfation by recombinant human sulfotransferase isoforms sult1a1 and sult1a3. | ritodrine is known to undergo extensive presystemic sulfation in the intestinal mucosa, and its bioavailability is as low as 30%. accordingly, inhibition of intestinal sulfation may lead to an increase in the bioavailability of ritodrine. in this study, we aimed to investigate the activities of ritodrine sulfation by sult1a1, which is expressed predominantly in the liver, and sult1a3, which is expressed predominantly in the intestine, as well as the inhibitory effects of beverages on their activ ... | 2005 | 16078151 |
| separation of catechin constituents from five tea cultivars using high-speed counter-current chromatography. | catechins were extracted from five different tea (camellia sinensis l.) cultivars. high-speed counter-current chromatography was found to be an efficient method for the separation of seven catechins from the catechin extracts. high-performance liquid chromatography was used to assess the purity of the catechins isolated. epigallocatechin gallate (egcg), epicatechin gallate (ecg) and epigallocatechin (egc) of high purity (91-99%) were isolated in high yield after a single high-speed counter-curre ... | 2005 | 16078712 |
| associations between black tea and coffee consumption and risk of lung cancer among current and former smokers. | although cigarette smoking is a clear risk factor for lung cancer, the other determinants of lung cancer risk among smokers are less clear. tea and coffee contain catechins and flavonoids, which have been shown to exhibit anticarcinogenic properties. conversely, caffeine may elevate cancer risk through a variety of mechanisms. the current study investigated the effects of regular consumption of black tea and coffee on lung cancer risk among 993 current and former smokers with primary incident lu ... | 2005 | 16090999 |
| comparative evaluation of the chemopreventive efficacy of green and black tea polyphenols in the hamster buccal pouch carcinogenesis model. | to evaluate the comparative chemopreventive efficacy of green tea polyphenols (polyphenon-e) and black tea polyphenols (polyphenon-b) on 7,12-dimethylbenz[a]anthracene (dmba)-induced hamster buccal pouch (hbp) carcinogenesis. | 2005 | 16098960 |
| synergistic antimicrobial activity of tea & antibiotics. | tea leaves are known for its antibacterial activity against many microorganisms. in this study we attempted to describe the synergistic antimicrobial activity of tea and antibiotics against enteropathogens. antimicrobial activity of boiled water tea extract and organic solvent extract were studied against salmonella typhimurium 1402/84, s. typhi, s. typhi ty2a, shigella dysenteriae, yersinia enterocolitica c770, and escherichia coli (epec p2 1265) determining minimum inhibitory concentration (mi ... | 2005 | 16106094 |
| protective effects of black tea extract on testosterone induced oxidative damage in prostate. | since ancient times, antipyretic, anti-inflammatory, antimicrobial and antioxidative properties of tea have been recognized. black tea (camellia sinensis) contains a variety of polyphenolic ingredients including the theaflavins (tf), thearubigins (tg) and catechins. components from black tea have been accounted to play an important role in scavenging free radicals generated by mutagens and carcinogens. androgens are the key factors in either the initiation or progression of prostate cancer (pca) ... | 2005 | 16112415 |
| influence of tea drinking on manganese intake, manganese status and leucocyte expression of mnsod and cytosolic aminopeptidase p. | since black tea contains high levels of manganese (mn), we investigated the relationship between dietary mn intake, circulating mn levels and leucocyte expression of two mn-dependent enzymes in tea drinkers and non-tea drinkers. | 2006 | 16118651 |
| risk factors for kidney cancer in a japanese population: findings from the jacc study. | the incidence of kidney cancer is high in western and northern europe and north america, and low in asia. although the incidence of kidney cancer in japan is lower than the rates in the other industrialized countries, there is no doubt that it is increasing. | 2005 | 16127235 |
| hplc analysis of naturally occurring methylated catechins, 3' '- and 4' '-methyl-epigallocatechin gallate, in various fresh tea leaves and commercial teas and their potent inhibitory effects on inducible nitric oxide synthase in macrophages. | (-)-epigallocatechin-3-gallate (egcg), a major polyphenol of green tea, undergoes substantial biotransformation to species that includes the methylated compounds. recent studies have demonstrated that the methylated egcg has many biological activities. in this study, we have investigated the composition of the three o-methylated egcg derivatives, (-)-epigallocatechin-3-o-(3-o-methyl)gallate (3' '-me-egcg), (-)-epigallocatechin-3-o-(4-o-methyl)gallate (4' '-me-egcg) and (-)-4'-methyl epigallocate ... | 2005 | 16131108 |
| medicinal benefits of green tea: part ii. review of anticancer properties. | currently there is wide interest in the medicinal benefits of green tea (camellia sinensis). tea is one of the most widely consumed beverages in the world, and extracts of tea leaves are also sold as dietary supplements. green tea extracts contain a unique set of catechins that possess biologic activity in antioxidant, antiangiogenesis, and antiproliferative assays that are potentially relevant to the prevention and treatment of various forms of cancer. with the increasing interest in the health ... | 2005 | 16131288 |
| [acute hepatitis induced by camellia sinensis (green tea)]. | 2005 | 16145729 | |
| fulminant hepatitis during self-medication with hydroalcoholic extract of green tea. | despite an ancient reputation for potential phytotherapeutic effects and innocuity, traditional herbal medicine has previously been implicated in severe adverse events. exolise is an 80% ethanolic dry extract of green tea (camellia sinensis) standardized at 25% catechins expressed as epigallocatechin gallate, containing 5-10% caffeine. it has been available in france, belgium, spain and the united kingdom since 1999, as an adjuvant therapy for use in weight loss programmes. in various studies, g ... | 2005 | 16148563 |
| inhibitory effects of epigallocatechin gallate on compound 48/80-induced mast cell activation and passive cutaneous anaphylaxis. | epigallocatechin gallate (egcg) is a principle phenolic antioxidant found in a variety of plants, including green and black tea. the anti-allergic effect of egcg is unknown. the purpose of this study is to investigate the effects of egcg on compound 48/80-induced mast cell activation and passive cutaneous anaphylaxis. for this, the influences of egcg on the compound 48/80-induced cutaneous reaction were measured in vivo and the effects of egcg on the compound 48/80-induced mast cell activations ... | 2005 | 16155406 |
| a novel black tea pigment and two new oxidation products of epigallocatechin-3-o-gallate. | during tea fermentation, oxidation-reduction dismutation of a number of quinone metabolites of tea catechins yields numerous minor products, which make it difficult to separate and purify black tea polyphenols. in this study, epigallocatechin-3-o-gallate was enzymatically oxidized and then the unstable quinone metabolites in the oxidation mixture were hydrogenated with 2-mercaptoethanol to reduce production of inseparable minor dismutation products. as a result, three new oxidation products incl ... | 2005 | 16159188 |
| novel treatments for obesity and osteoporosis: targeting apoptotic pathways in adipocytes. | obesity and osteoporosis have grave consequences for human health, quality of life, and even the efficiency of the labor force and economy. however, these pathologies share a common cell progenitor, revealing a surprising target for drug research and development. recent findings show that high adipocyte count in bone marrow is directly related to bone loss, as fat cells replace osteoblasts (or bone-forming cells). the objective of this review is to examine the importance of adipocyte apoptosis i ... | 2005 | 16178781 |
| effect of herbal polyphenols on atherogenic transcriptome. | the ancient indian system of medicine supports the antiatherogenic properties of some herbs. the crosstalk amongst the genes coding for ldlr, lxralpha, ppars (alpha,gamma), cd-36 and c-myc may be important in atherogenesis because these genes control lipid metabolism, cytokine production and cellular activity within the arterial wall. hence, we attempted for the first time to explore whether or not the polyphenols extracted from medicinal herbs had any effect on the transcription of these genes. ... | 2005 | 16180103 |
| floratheasaponins a-c, acylated oleanane-type triterpene oligoglycosides with anti-hyperlipidemic activities from flowers of the tea plant (camellia sinensis). | the methanolic extract and its n-butanol-soluble fraction from the flowers of the tea plant (camellia sinensis) were found to suppress serum triglyceride elevation in olive oil-treated mice. from the n-butanol-soluble fraction, three new acylated oleanane-type triterpene oligoglycosides, floratheasaponins a-c (1-3), were isolated together with several flavonol glycosides and catechins. the structures of 1-3 were elucidated on the basis of chemical and physicochemical evidence as 21-o-angeloyl-22 ... | 2005 | 16180814 |
| [chemical and sensory characterization of tea (thea sinensis) consumed in chile]. | by means of descriptive analysis four varieties of tea (thea sinensis) were assesed: argentinean op (orange pekoe) tea (black), brazilian op tea (black), ceylan op tea (black) and darjeeling op tea (green). the appearance of dry tea leaves were qualitatively characterized comparing with dry leaves standard. the attributes: colour, form, regularity of the leaves, fibre and stem cutting were evaluated the differences obtained were related to the differences produced by the effect of the fermentati ... | 2005 | 16187684 |
| creaming in black tea. | tea cream is the precipitate formed as tea cools. its formation has been studied by x-ray scattering, and it is shown that a higher tea concentration leads to earlier onset of creaming and larger particles and that addition of theaflavin and calcium promotes creaming. association constants between the major components of black tea have been obtained using nmr and show that calcium and glucose enhance the self-association of caffeine, polyphenols, and theaflavin but have little effect on hetero-a ... | 2005 | 16190662 |
| oxidative deamination of benzylamine and lysine residue in bovine serum albumin by green tea, black tea, and coffee. | oxidative deamination by various polyphenolic compounds is presumed to be due to the oxidative conversion of polyphenols to the corresponding quinones through autoxidation. here we examined the oxidative deamination by the polyphenol-rich beverages green tea, black tea, and coffee at a physiological ph and temperature. green tea, black tea, and coffee extracts oxidatively deaminated benzylamine and the lysine residues of bovine serum albumin to benzaldehyde and alpha-aminoadipic delta-semialdehy ... | 2005 | 16190665 |
| modulation of mpp+ uptake by tea and some of its components in caco-2 cells. | the entry of most xeno/endobiotics into the organism is limited by their intestinal absorption. the interference of certain foods with the therapeutic efficacy of drugs or with chemical toxicity is becoming evident and growing attention is being given to these subjects. the aim of this work was to study the effect of green tea (gt) and black tea (bt), as well as some of their components, on the transport of organic cation molecules. for this purpose, 3h-mpp+ (radiolabeled 1-methyl-4-phenylpyridi ... | 2005 | 16193318 |
| cytotoxic and apoptogenic effect of tea (camellia sinensis var. assamica) root extract (tre) and two of its steroidal saponins ts1 and ts2 on human leukemic cell lines k562 and u937 and on cells of cml and all patients. | the anticancer activity of di- and tri-terpenes and other polyphenolic compounds present in tea is already reported. we evaluated the cytotoxic and apoptogenic effect of tea root extract (tre) and two of its steroidal saponins named as ts1 and ts2, on human cell lines and on cells from leukemic patients. it was found that tre, ts1 and ts2 significantly decreased cell count and that tre caused apoptosis, as confirmed morphologically by confocal microscopy and by flow-cytometric analysis using ann ... | 2006 | 16197994 |
| hepatoprotective effect of green tea (camellia sinensis) extract against tamoxifen-induced liver injury in rats. | tamoxifen citrate (tam), is widely used for treatment of breast cancer. it showed a degree of hepatic carcinogenesis. the purpose of this study was to elucidate the antioxidant capacity of green tea (camellia sinensis) extract (gte) against tam-induced liver injury. a model of liver injury in female rats was done by intraperitoneal injection of tam in a dose of 45mg kg(-1) day(-1), i.p. for 7 successive days. gte in the concentration of 1.5 %, was orally administered 4 days prior and 14 days aft ... | 2005 | 16202236 |
| green tea leaf extract improves lipid and glucose homeostasis in a fructose-fed insulin-resistant hamster model. | the present study evaluated the effect of green tea (camellia sinensis l.) leaf extract on triglyceride and glucose homeostasis in a fructose-fed hypertriglyceridemic, insulin-resistant hamster model. there was a significant decrease in plasma triglyceride levels following supplementation of the green tea epigallocatechin gallate-enriched extract (42% at 150 mg/(kg day) to 62% at 300 mg/(kg day) for 4 weeks). compared to baseline, the fructose control group at the end of the study showed elevate ... | 2006 | 16202550 |
| dose-dependent levels of epigallocatechin-3-gallate in human colon cancer cells and mouse plasma and tissues. | epigallocatechin-3-gallate (egcg; molecular formula: c22h18011)is the most abundant catechin in green tea (camellia sinensis theaceae). both egcg and green tea have been shown to have cancer-preventive activity in a number of animal models, and numerous mechanisms have been proposed based on studies with human cell lines. egcg has been shown to undergo extensive biotransformation to yield methylated and glucuronidated metabolites in mice, rats, and humans. in the present study, we determined the ... | 2006 | 16204466 |
| keemun black tea extract contains potent fatty acid synthase inhibitors and reduces food intake and body weight of rats via oral administration. | the inhibitory effects of a black tea extract on fatty acid synthase were measured through inhibition kinetics. the keemun black tea extract showed more potent inhibitory activity on fatty acid synthase than green tea extract. additionally, the inhibitory ability of the black tea extract depended on the extracting solvent and the conditions used. only 10-23% of the inhibitory activity from the black tea was extracted by the general method of boiling with water. the results suggested that the mai ... | 2005 | 16206829 |
| arsenic removal from groundwater by pretreated waste tea fungal biomass. | arsenic contamination in ground water poses a serious threat on human health. the tea fungus, a waste produced during black tea fermentation has been examined for its capacity to sequester the metal ions from ground water samples. autoclaved tea fungal mat and autoclaving followed by fecl3 pretreated tea fungal mat were exploited for removal of as(iii), as(v) and fe(ii) from ground water sample collected from kolkata, west bengal, india. the biosorption rate tends to increase with the increase i ... | 2006 | 16216732 |
| antifungal activity of plant extracts against arthrinium sacchari and chaetomium funicola. | various plant extracts were examined for antifungal activity with the objective of improving the commercial sterility of aseptically filled tea beverage products in pet bottles. when the hot water extract and the methanol extract of 29 samples were measured for their antifungal activity against arthrinium sacchari m001 and chaetomium funicola m002 strains, five samples, acer nikoense, glycyrrhiza glabra, lagerstroemia speciosa, psidium guajava and thea sinensis, showed high activity. of these, t ... | 2000 | 16232887 |
| camellia sinensis: historical perspectives and future prospects. | as the source of brewed tea preparations, camellia sinensis has operated for centuries at the interface of agriculture, politics, and biology. the purpose of this review is to present an inter-disciplinary survey of issues surrounding cultivation, processing, and consumption of the tea plant. particular attention is given to the biologic effects of tea: first, assessing at the level of human physiology its value as a chemopreventive and chemotherapeutic agent; second, examining effects of produc ... | 2005 | 16236672 |
| analytical separation of tea catechins and food-related polyphenols by high-speed counter-current chromatography. | high-speed counter-current chromatography (hsccc) using the type-j coil planet centrifuge was applied to compositional analysis of tea catechins and separation of other food-related polyphenols. the hsccc separation of nine different standard compounds and those from extracts of commercial tea leaves was performed with a two-phase solvent system composed of tert-butyl methyl ether-acetonitrile-0.1% aqueous trifluoroacetic acid (tfa) (2:2:3, v/v/v) by eluting the upper organic phase at a flow rat ... | 2006 | 16239007 |
| puerins a and b, two new 8-c substituted flavan-3-ols from pu-er tea. | pu-er tea is a special treated fermented tea produced from crude green tea, which is prepared from the leaves of camellia sinensis var. assamica. it is a traditional beverage having been used in china, particularly the southern areas, for a long time. chemical investigation led to the identification of two new 8-c substituted flavan-3-ols, puerins a (1) and b (2), and two known cinchonain-type phenols, epicatechin-[7,8-bc]-4alpha-(4-hydroxyphenyl)-dihydro-2(3h)-pyranone (3) and cinchonain ib (4) ... | 2005 | 16248561 |
| flavor characteristics of lapsang souchong and smoked lapsang souchong, a special chinese black tea with pine smoking process. | the major volatile constituents of lapsang souchong, smoked lapsang souchong, and smoked souchong, a group of special black teas in china, were analyzed with gc and gc-ms analyses. forty-nine constituents were identified. longifolene and alpha-terpineol were the most abundant compounds in the aroma. due to its special production process, the compounds longifolene, longicyclene, guaiacol, 4-methylguaiacol, 4-ethylguaiacol, etc., were identified only in this kind of black tea. the aroma constituen ... | 2005 | 16248572 |
| induction of apoptosis in human leukemia cells by black tea and its polyphenol theaflavin. | treatment of human leukemic cell lines hl-60 and k-562 with extracts of green and black tea and their polyphenols epigallocatechin gallate and theaflavins, respectively, showed a dose dependent inhibition of growth as a result of cytotoxicity and suppression of cell proliferation. based on the ic50 values obtained from cytotoxicity data it was clearly evident that black tea was as efficient as green tea. analysis of polyphenol contents of tea extracts revealed that not only epigallocatechin gall ... | 2005 | 16253767 |
| [rapd analysis on genetic diversity of the preconcentrated core germplasms of camellia sinensis in china]. | the study was to evaluate the genetic diversity of 69 tea cultivars of the preconcentrated core germplasms of camellia sinensis in china by the random amplified polymorphic dna (rapd). among 50 arbitrary primers, 32 primers could generate enough amplified bands for all the strains in this study. among a total of 348 bands observed, 328 (94.3%)bands were polymorphic in the 69 cultivars tested except additional 20 cultivars. genetic distances between the cultivars varied from 0.223 to 0.723. the s ... | 2005 | 16257906 |
| black tea may be as good as green. | 2005 | 16259081 | |
| oral administration of a decaffeinated green tea (camellia sinensis) extract did not alter urinary 8-epi-prostaglandin f(2 alpha), a biomarker for in-vivo lipid peroxidation. | oxidative stress is involved in the pathogenesis of numerous chronic human diseases. the objective of this study was to determine whether administration of a decaffeinated green tea extract providing 844 mg flavonoids daily reduced the urinary excretion of 8-epi-prostaglandin f(2 alpha) (8-epi-pgf(2 alpha)), a product of lipid peroxidation in cellular membranes and of low-density lipoprotein (ldl). nine healthy male and female subjects were studied at baseline and after 14 days of green tea supp ... | 2005 | 16259767 |
| more tea for septic patients?--green tea may reduce endotoxin-induced release of high mobility group box 1 and other pro-inflammatory cytokines. | despite recent advances in antibiotic therapy and intensive care, sepsis remains widespread problems in critically ill patients. the high mortality of sepsis is in part mediated by bacterial endotoxin, which stimulates macrophages/monocytes to sequentially release early (e.g., tnf, il-1, and ifn-gamma) and late (e.g., hmgb1) pro-inflammatory cytokines. in light of our recent discovery of hmgb1 as a late mediator of lethal systemic inflammation, and the observation that green tea (camellia sinens ... | 2006 | 16266789 |
| in vitro and in vivo antimicrobial action of tea: the commonest beverage of asia. | the methanolic extract of leaves of camellia sinensis (l) o. kuntze was screened for antimicrobial property against 111 bacteria comprising 2 genera of gram positive and 7 genera of gram negative bacteria. most of these strains were inhibited by the compound at 10-50 microg/ml level and few strains were sensitive even at lower concentrations (5 microg/ml). the bacteria could be arranged in the decreasing order of sensitivity towards the compound in the following manner: staphylococcus aureus, vi ... | 2005 | 16272702 |
| aqueous extract of black tea (camellia sinensis) prevents ethanol+cholecystokinin-induced pancreatitis in a rat model. | black tea extract (bte), a phytocompound has been attributed with a plethora of health-promoting actions. we have previously demonstrated that bte inhibits chronic hepatitis in a rat model induced with high-fat and ethanol (etoh). this study reports that bte prevents altered pancreatic acinar cell functions, oxidative stress, inflammatory changes and dna damage in the etoh+cholecystokinin (cck)-induced model of pancreatitis. the etoh+cck model rats were administered with bte, and were examined t ... | 2006 | 16289561 |
| antioxidant activity of various teas against free radicals and ldl oxidation. | tea is a widely consumed beverage throughout the world. we assessed the antioxidant activity of six teas, including the aqueous extracts of green tea and oolong tea (camellia sinensis), tochu (eucommia ulmoides), gymnema sylvestre, japanese mugwort (artemisia princeps), and barley (hordeum vulgare), against 1,1-diphenyl-2-picrylhydrazyl (dpph) radicals and ldl oxidation, and examined the association of ldl oxidizability with the plasma catechin levels in 10 healthy volunteers with a single dose ... | 2005 | 16296404 |
| in vitro cytotoxicity of a theaflavin mixture from black tea to malignant, immortalized, and normal cells from the human oral cavity. | the growth inhibitory effects of a theaflavin mixture from black tea were more pronounced to malignant (cal27; hsc-2; hsg1) and immortalized (s-g; gt1) cells than to normal (hgf-2) cells from the human oral cavity. studies with malignant carcinoma cal27 cells and immortalized gt1 fibroblasts showed that cytotoxicity of the theaflavin mixture was enhanced as the exposure time was increased, with the tumor cal27 cells more sensitive than the gt1 cells. hydrogen peroxide (h(2)o(2)) was detected in ... | 2006 | 16297594 |
| copper(ii)-selective fluorimetric bulk optode membrane based on a 1-hydroxy-9,10-anthraquinone derivative having two propenyl arms as a neutral fluorogenic ionophore. | a new optical chemical sensor has been developed for the selective determination of copper(ii) ions in aqueous solutions. the reversible sensing system was prepared by incorporating 1-hydrpxy-2-(prop-2'-enyl)-4-(prop-2'-enyloxy)-9,10-anthraquinone (aq) as a neutral cu2+-selective fluoroionophore in the plasticized pvc membrane with potassium tetrakis(p-chlorophenyl borate) as an anionic additive. the response of the sensor is based on the fluorescence quenching of aq by cu2+ ions. at a ph 5.5, t ... | 2006 | 16307904 |
| green tea, black tea and breast cancer risk: a meta-analysis of epidemiological studies. | experimental studies have shown that tea and tea polyphenols have anti-carcinogenic properties against breast cancer. a number of epidemiologic studies, both case-control and cohort in design, have examined the possible association between tea intake and breast cancer development in humans. this meta-analysis included 13 papers which examined populations in eight countries and provided data on consumption of either green tea or black tea, or both in relation to breast cancer risk. summary odds r ... | 2006 | 16311246 |
| anticlastogenic effects of black tea polyphenols theaflavins and thearubigins in human lymphocytes in vitro. | black tea accounts for nearly 80% of total world tea production. it contains dimeric flavanols and polymeric polyphenols known as theaflavins (tf) and thearubigins (tr). tr is exclusively present in black tea. on the basis of our previous potent antimutagenic and anticlastogenic effects of tf and tr in vitro in bacterial system and in vivo in mouse bone marrow cells, we have decided to extend our study in human cells in vitro. this study investigated the anticlastogenic effects of black tea poly ... | 2006 | 16314069 |
| effect of polymeric black tea polyphenols on benzo(a)pyrene [b(a)p]-induced cytochrome p4501a1 and 1a2 in mice. | the chemopreventive activity of green tea polyphenols (gtps) is, in part, due to modulation of cytochrome p450s (cyps). to investigate the enzyme modulatory properties of major black tea polyphenols, the effect of decaffeinated black tea extract (dbte) or polymeric black tea polyphenol (pbp) mix was studied on cyp1a1 and cyp1a2 in mouse tissues. animals receiving 2.5% dbte or 1% pbp mix or drinking water (15 days) were challenged with single oral benzo(a)pyrene (b(a)p) (1 mg/mouse) treatment on ... | 2005 | 16316927 |
| a clinical study: melaleuca, manuka, calendula and green tea mouth rinse. | a novel mouthrinse (ind 61,164) containing essential oils and extracts from four plant species (melaleuca alternifolia, leptospermum scoparium, calendula officinalis and camellia sinensis) were tested. this study aimed to evaluate the safety, palatability and preliminary efficacy of the rinse. fifteen subjects completed the phase i safety study. seventeen subjects completed the phase ii randomized placebo-controlled study. plaque was collected, gingival and plaque indices were recorded (baseline ... | 2005 | 16317652 |
| bioactive saponins and glycosides. xxiii. triterpene saponins with gastroprotective effect from the seeds of camellia sinensis--theasaponins e3, e4, e5, e6, and e7. | the saponin fraction from the seeds of the tea plant [camellia sinensis (l.) o. kuntze (theaceae)] was found to exhibit potent protective effects on ethanol- and indomethacin-induced gastric mucosal lesions in rats. five new triterpene saponins, theasaponins e3 (1), e4 (2), e5 (3), e6 (4), and e7 (5), were isolated together with 11 known saponins from the saponin fraction. the chemical structures of 1-5 were elucidated on the basis of chemical and physicochemical evidence. among the isolated sap ... | 2005 | 16327189 |
| stereoselective oxidation at c-4 of flavans by the endophytic fungus diaporthe sp. isolated from a tea plant. | the microbial transformation of five flavans (1-5) by endophytic fungi isolated from the tea plant camellia sinensis was investigated. it was found that the endophytic filamentous fungus diaporthe sp. oxidized stereoselectively at c-4 position of (+)-catechin (1) and (-)-epicatechin (2) to give the correspondent 3,4-cis-dihydroxyflavan derivatives (6, 10), respectively. (-)-epicatechin 3-o-gallate (3) and (-)-epigallocatechin 3-o-gallate (4) were also oxidized by the fungus into 3,4-dihydroxyfla ... | 2005 | 16327190 |
| changing diversity of hymenopteran parasitoids from organically and conventionally managed tea-ecosystem of north bengal, india. | tea, camellia sinensis (l.) o. kuntze, is grown conventionally (application of chemical fertilizer and pesticides) as well as organically in darjeeling hills and adjoining plains. studies on parasitic hymenoptera gain relevance due to their effective role as biocontrol agents for maintenance of ecological balance and as biological indicators of health of tea agro-ecosystem. diversity of the hymenopterans was studied using shannon-weaver index (1963) both at morphospecies and family levels. the a ... | 2005 | 16334289 |
| copper(ii)-selective fluorimetric bulk optode membrane based on a 1-hydroxy-9,10-anthraquinone derivative having two propenyl arms as a neutral fluorogenic ionophore. | a new optical chemical sensor has been developed for the selective determination of copper(ii) ions in aqueous solutions. the reversible sensing system was prepared by incorporating 1-hydroxy-2-(prop-2'-enyl)-4-(prop-2'-enyloxy)-9,10-anthraquinone (aq) as a neutral cu2+-selective fluoroionophore in the plasticized pvc membrane with potassium tetrakis(p-chlorophenyl borate) as an anionic additive. the response of the sensor is based on the fluorescence quenching of aq by cu2+ ions. at a ph 5.5, t ... | 2006 | 16344241 |
| tea consumption and ovarian cancer risk in a population-based cohort. | substantial evidence from laboratory studies indicates that green and black tea preparations may protect against various cancers. few epidemiologic studies, however, have examined the relationship specifically between tea consumption and risk of ovarian cancer. | 2016 | 16344429 |
| theaflavin-3, 3'-digallate induces epidermal growth factor receptor downregulation. | black tea is one of the most popular beverages worldwide and especially in western nations. theaflavins, a mixture of theaflavin (tf-1), theaflavin-3-gallate (tf-2a), theaflavin-3'-gallate (tf-2b), and theaflavin-3,3'-digallate (tf-3) are the major components of black tea. among these black tea components, theaflavin is generally considered to be the more effective component for the inhibition of carcinogenesis. recently, tf-3 has been shown to have an antiproliferative effect on tumor cells, bu ... | 2006 | 16353237 |
| tealeaves may release or absorb fluoride, depending on the fluoride content of water. | as the tea plant (camellia sinensis) is known to accumulate fluoride from the soil, the tealeaves may contain high concentrations of fluoride, which is easily released during infusion. in this study, we have tested the possible effect of original fluoride concentration in the water on the fluoride release from tea. moreover, we wanted to test the possible capacity of tealeaves (commercially available tea) to absorb fluoride from high-fluoride water. in low-fluoride water, fluoride is easily rele ... | 2006 | 16356534 |
| genetic integrity of somaclonal variants in tea (camellia sinensis (l.) o kuntze) as revealed by inter simple sequence repeats. | adoption of inter simple sequence repeats (issr) technique to analyze the genetic variability of somatic embryo derived tea plants was evaluated. morphological characterisation of the field grown plants revealed no identical character aligning with the parent, upasi-10. out of 40 primers, 15 exhibited concurrent polymorphism were selected for the study. genetic variability of somaclones derived from single line cotyledonary culture ranged from 33.0 to 55.0%. a unique fragment of 1.2kb was visibl ... | 2006 | 16360228 |
| safety studies on epigallocatechin gallate (egcg) preparations. part 1: genotoxicity. | public interest in green tea has grown recently due to the potential health benefits from its consumption. epigallocatechin gallate (egcg), a principal polyphenolic component of green tea, is considered key to these healthful qualities. although numerous studies have evaluated the anti-cancer effects of green tea and egcg, few have examined the safety of egcg consumption. the genotoxic potential of a concentrated egcg preparation was tested in salmonella and l5178y tk+/- mouse lymphoma cell assa ... | 2006 | 16364532 |
| of the major phenolic acids formed during human microbial fermentation of tea, citrus, and soy flavonoid supplements, only 3,4-dihydroxyphenylacetic acid has antiproliferative activity. | dietary flavonoids are poorly absorbed from the gastrointestinal tract. colonic bacteria convert flavonoids into smaller phenolic acids (pa), which can be absorbed into the circulation and may contribute to the chemopreventive activity of the parent compounds. the purpose of our study was to determine whether flavonoids from green and black tea (gt, bt), citrus fruit with rutin (cf+r) and soy (s) supplements exposed to the same conditions in a dynamic in vitro model of the colon (tim-2) will for ... | 2006 | 16365058 |
| consumption of coffee, but not black tea, is associated with decreased risk of premenopausal breast cancer. | caffeine has been suggested as a possible risk factor for breast cancer, potentially through its effect of facilitating the development of benign breast disease. however, coffee and tea also contain polyphenols, which exhibit anticarcinogenic properties. a hospital-based, case-control study was conducted to evaluate the role of coffee, decaffeinated coffee, and black tea in breast cancer etiology. study participants included 1932 cases with primary, incident breast cancer and 1895 hospital contr ... | 2006 | 16365077 |
| the effect of an herbal supplement containing black tea and caffeine on metabolic parameters in humans. | the objective of this study was to test an herbal supplement containing black tea (the fully oxidized form of camellia sinensis) and caffeine for stimulation of thermogenesis. | 2005 | 16366740 |
| green tea consumption in everyday life and mental health. | green tea has been widely acknowledged in japan to induce a pleasurable mental feeling. recent laboratory studies have suggested positive psychological effects as a result of consuming green tea. the present study examined whether green tea consumption in everyday life in japan is associated with positive mental health. | 2005 | 16372926 |