Publications
| Title | Abstract | Year Filter | PMID(sorted descending) Filter |
|---|
| acute hepatitis after treatment for hair loss with oral green tea extracts (camellia sinensis). | nutritional additives based on green tea have been claiming various beneficial health effects. however, several case reports on hepatotoxicity after the intake of green tea derivatives containing camellia sinensis have been published. we report a patient with an acute hepatitis after intake of an oral green tea derivative claiming protection against hair loss, showing a histological image compatible with drug induced hepatitis. other important causes of hepatitis were excluded. after cessation o ... | 2016 | 19637786 |
| dietary phenolics: chemistry, bioavailability and effects on health. | there is much epidemiological evidence that diets rich in fruit and vegetables can reduce the incidence of non-communicable diseases such as cardiovascular diseases, diabetes, cancer and stroke. these protective effects are attributed, in part, to phenolic secondary metabolites. this review summarizes the chemistry, biosynthesis and occurrence of the compounds involved, namely the c6-c3-c6 flavonoids-anthocyanins, dihydrochalcones, flavan-3-ols, flavanones, flavones, flavonols and isoflavones. i ... | 2009 | 19636448 |
| speciation and separation of cr(vi) and cr(iii) using coprecipitation with ni2+/2-nitroso-1-naphthol-4-sulfonic acid and determination by faas in water and food samples. | a speciation procedure for chromium(iii) and chromium(vi) in the water and food samples has been established in the presented work. the procedure presented based on quantitative recoveries of cr(iii)>95% using coprecipitation of ni(2+)/2-nitroso-1-naphthol-4-sulfonic acid. the total chromium was measured after reduction of cr(vi) by concentrated h(2)so(4) and ethanol. the cr(vi) was calculated as the difference between the total cr content and the cr(iii) contents. the analytical variables, ph, ... | 2009 | 19632291 |
| catechin and catechin fractions as biochemical markers to study the diversity of indian tea (camellia sinensis (l.) o. kuntze) germplasm. | the heterogeneous indian tea germplasm includes 'china', 'assam', 'cambod', and their hybrids which were evaluated using biochemical markers viz., total catechin and their fractions, for varietal identification and characterization. principal component analysis (pca) of biochemical characters showed that the total catechin and trihydroxylated catechin has higher eigenvalues. the first two principal components (pcs) could differentiate more than 90% of the clones studied. this grouping based on f ... | 2009 | 19623550 |
| toxic and essential mineral elements content of black tea leaves and their tea infusions consumed in iran. | the metal contents of eleven black tea samples, four cultivated in iran and seven imported, and their tea infusions were determined. twelve elements consisting toxic metals (al, as, pb, cr, cd, and ni) and essential mineral elements (fe, zn, cu, mn, ca, and mg) were analyzed using inductively coupled plasma atomic emission spectroscopy (icp-aes). al, ca, mg, and mn ranged in black tea leaves at mg g(-1) levels, while cr, fe, ni, cu, zn were at microg g(-1) levels. analysis of variance showed no ... | 2010 | 19609493 |
| oxidation of the dihydrochalcone aspalathin leads to dimerization. | aspalathin and nothofagin are typical ingredients of unfermented rooibos (krafczyk, n.; glomb, m. a. j. agric. food chem. 2008, 56, 3368). during oxidation these dihydrochalcones were degraded to higher molecular weight browning products under aerated and nonenzymatic conditions. in the early stages of browning reactions aspalathin formed two dimers. these two compounds were unequivocally established as atropisomers stemming from oxidative a to b ring coupling. multilayer countercurrent chromato ... | 2009 | 19601579 |
| coffee and black tea consumption and risk of breast cancer by estrogen and progesterone receptor status in a swedish cohort. | coffee and tea consumption has been inconsistently associated with the risk of breast cancer. we examined the associations of caffeinated coffee and black tea consumption with the incidence of breast cancer, overall and by estrogen receptor (er) and progesterone receptor (pr) status of the tumor, in the swedish mammography cohort. | 2009 | 19597749 |
| role of oxidation-triggered activation of jnk and p38 mapk in black tea polyphenols induced apoptotic death of a375 cells. | theaflavins (tf) and thearubigins (tr) are the major polyphenols of black tea. our previous study revealed that tf- and tr-induced apoptosis of human malignant melanoma cells (a375) is executed via a mitochondria-mediated pathway. in our present study we observed the role of the three most important mapk (erk, jnk, and p38) in tf- and tr-induced apoptosis. tf and tr treatment of a375 cells led to sustained activation of jnk and p38 mapk but not erk, suggesting that jnk and p38 are the effector m ... | 2009 | 19594545 |
| green tea (camellia sinensis) for the prevention of cancer. | tea is one of the most commonly consumed beverages worldwide. teas from the plant camellia sinensis can be grouped into green, black and oolong tea. cross-culturally tea drinking habits vary. camellia sinensis contains the active ingredient polyphenol, which has a subgroup known as catechins. catechins are powerful antioxidants. it has been suggested that green tea polyphenol may inhibit cell proliferation and observational studies have suggested that green tea may have cancer-preventative effec ... | 2009 | 19588362 |
| how would you like your tea, vicar? | scald injuries are the commonest cause of paediatric burns leading to hospital admission both in the united kingdom (national burn care review committee report; 2001) and around the world. the cost and significant morbidity resulting from scald injuries reiterates the need for effective prevention campaigns for primary caregivers. the majority of scalds in children occur in the kitchen (49%) at home. three children a day under the age of 5 (1100/year) are involved in scalds resulting from pullin ... | 2010 | 19586723 |
| inhibitory effect of tea polyphenols on local tissue damage induced by snake venoms. | the methanolic extract of fresh tea leaves of camellia sinensis l. (theaceae) (cs) was assayed for its potential to inhibit enzymes with hydrolytic activity in naja naja kaouthia lesson (elapidae) and calloselasma rhodostoma kuhl (viperidae) venoms. these snake venom enzymes are responsible for the early effects of envenomation, such as local tissue damage and inflammation. the cs extract inhibited phospholipase a(2), proteases, hyaluronidase and l-amino acid oxidase in both venoms by in vitro n ... | 2010 | 19585481 |
| quantitation of chafurosides a and b in tea leaves and isolation of prechafurosides a and b from oolong tea leaves. | a procedure was developed for the quantitative determination of chafuroside a, a flavone c-glycoside with potent anti-inflammatory activity, and its regioisomer chafuroside b, as well as isovitexin and vitexin, by selected reaction monitoring liquid chromatography-tandem mass spectrometry (srm lc-ms/ms) analysis. this method was successfully applied to commercial leaves of green tea, houji tea, oolong tea, and black tea. high levels of chafurosides a and b were found in oolong tea leaves that ha ... | 2009 | 19572651 |
| induction of apoptosis by tea polyphenols mediated through mitochondrial cell death pathway in mouse skin tumors. | many naturally occurring phytochemicals have shown cancer chemopreventive potential in a variety of bioassay systems. one such naturally occurring biologically active compound is tea camellia sinensis, which is the most consumed beverage in the world after water. the most abundant and active constituents of tea are polyphenols (epigallocatechin gallate and theaflavins). in the present study, cancer chemopreventive properties of both black tea polyphenols (btp) and green tea polyphenols (gtp) on ... | 2009 | 19556852 |
| acylated oleanane-type triterpene saponins with acceleration of gastrointestinal transit and inhibitory effect on pancreatic lipase from flower buds of chinese tea plant (camellia sinensis). | the meoh extract and its buoh-soluble fraction (crude saponin fraction) from the flower buds of chinese tea plant (camellia sinensis (l.) o. kuntze; fujian province) were found to exhibit accelerating effects on gastrointestinal transit in mice and inhibitory effects against pancreatic lipase. from the buoh-soluble fraction, three new acylated oleanane-type triterpene oligoglycosides, chakasaponins i, ii, and iii (1-3, resp.), were isolated together with 13 known compounds. the chemical structur ... | 2009 | 19551732 |
| black tea polyphenols target matrix metalloproteinases, reck, proangiogenic molecules and histone deacetylase in a rat hepatocarcinogenesis model. | the aim of this study was to evaluate the chemopreventive effects of black tea polyphenols (polyphenon-b) on markers of invasion and angiogenesis during dimethylaminoazobenzene (dab)-induced hepatocarcinogenesis. | 2009 | 19528495 |
| tea polyphenols inhibit cyclooxygenase-2 expression and block activation of nuclear factor-kappa b and akt in diethylnitrosoamine induced lung tumors in swiss mice. | due to lack of validated screening methods and hence poor prognosis, treatment of lung cancer has not still improved up to the expectations. therefore, risk of lung cancer needs to be minimized by efficient preventive measures. tea (camellia sinensis) and its bioactive polyphenols have been associated with prevention of human cancer for several organs. thus, intake of tea polyphenols seems to be a viable mean to control lung cancer burden. in the present study, we studied the chemopreventive eff ... | 2010 | 19517063 |
| black tea consumption dose-dependently improves flow-mediated dilation in healthy males. | flavonoids may protect against cardiovascular disease. tea is a major source of dietary flavonoids. studies indicate black tea improves endothelial function but data on arterial haemodynamics, blood pressure (bp) and insulin resistance are equivocal. inconsistency may be due to flaws in study design or flavonoid doses tested. further, no study has evaluated the dose-response curve. our study aimed to test the effects of various doses of black tea on vascular function, bp and insulin resistance. | 2009 | 19516176 |
| dietary pattern, the metabolic syndrome, and left ventricular mass and systolic function: the multi-ethnic study of atherosclerosis. | little is known about the relations between dietary patterns, metabolic dysfunction, and left ventricular (lv) function. | 2009 | 19515735 |
| online gas chromatography combustion/pyrolysis-isotope ratio mass spectrometry (hrgc-c/p-irms) of (+/-)-dihydroactinidiolide from tea ( camellia sinensis ) and rooibos tea ( aspalathus linearis ). | online capillary gas chromatography-isotope ratio mass spectrometry in both the combustion and the pyrolysis modes (hrgc-c/p-irms) was employed to perform authentication studies of the flavoring agent (+/-)-dihydroactinidiolide. thus, the delta(13)c(v-pdb) and delta(2)h(v-smow) values of synthetic (ex synthetic beta-ionone and natural beta-carotene) as well as enzymatically (ex synthetic and natural beta-carotene) produced references were studied in comparison with those of the natural substance ... | 2009 | 19514730 |
| increase of theaflavin gallates and thearubigins by acceleration of catechin oxidation in a new fermented tea product obtained by the tea-rolling processing of loquat ( eriobotrya japonica ) and green tea leaves. | in a project to produce a new fermented tea product from non-used tea leaves harvested in the summer, we found that kneading tea leaves ( camellia sinensis ) with fresh loquat leaves ( eriobotrya japonica ) accelerated the enzymatic oxidation of tea catechins. the fermented tea obtained by tea-rolling processing of tea and loquat leaves had a strong, distinctive flavor and a plain aftertaste, which differed from usual black, green, and oolong teas. the phenolic constituents were similar to those ... | 2009 | 19507893 |
| stimulated parametric emission microscopy. | we propose a novel microscopy technique based on the four-wave mixing (fwm) process that is enhanced by two-photon electronic resonance induced by a pump pulse along with stimulated emission induced by a dump pulse. a ti:sapphire laser and an optical parametric oscillator are used as light sources for the pump and dump pulses, respectively. we demonstrate that our proposed fwm technique can be used to obtain a one-dimensional image of ethanol-thinned coumarin 120 solution sandwiched between a ho ... | 2006 | 19503398 |
| effects of theaflavins on melanin biosynthesis in mouse b16 melanoma cells. | in this study, we examined the effects of theaflavins, polyphenols in black tea, on alpha melanocyte-stimulating hormone (alphamsh)-induced melanogenesis in mouse b16 melanoma cells. among theaflavins, theaflavin-3,3'-digallate (tf-3) exhibited a potent inhibitory effect on melanogenesis. our results indicate that the inhibitory effect of tf-3 on melanogenesis is due to suppression of tyrosinase protein and mrna levels. | 2009 | 19502752 |
| caffeine biosynthesis and degradation in tea [camellia sinensis (l.) o. kuntze] is under developmental and seasonal regulation. | to study caffeine biosynthesis and degradation, here we monitored caffeine synthase gene expression and caffeine and allantoin content in various tissues of four camellia sinensis (l.) o. kuntze cultivars during non-dormant (nd) and dormant (d) growth phases. caffeine synthase expression as well as caffeine content was found to be higher in commercially utilized tissues like apical bud, 1st leaf, 2nd leaf, young stem, and was lower in old leaf during nd compared to d growth phase. among fruit pa ... | 2009 | 19479388 |
| a case of kombucha tea toxicity. | kombucha "mushroom'' tea is touted to have medicinal properties. here, we present a case of hyperthermia, lactic acidosis, and acute renal failure within 15 hours of kombucha tea ingestion. | 2009 | 19460826 |
| ft-ir methodology for quality control of arabinogalactan protein (agp) extracted from green tea (camellia sinensis ). | a rapid methodology of quality control was developed for arabinogalactan proteins (agp) extracted and purified from green tea. using the vectorial angle method and ir spectrum analysis, the 1200-800 cm(-1) region in second-derivative ir spectra was determined as the key fingerprinting region of green tea agp, with the 1090-900 cm(-1) region reflecting their conservative and common characteristics. in fact, the key monosaccharides, galactose (gal) and arabinose (ara), were shown to have intense p ... | 2009 | 19456132 |
| a csgs is regulated at transcriptional level during developmental stages and nitrogen utilization in camellia sinensis (l.) o. kuntze. | glutamine synthetase is a very important enzyme of ammonium assimilation in plants. here, we report on the regulation of a cytosolic glutamine synthetase (csgs) from camellia sinensis (l.) o. kuntze during developmental stages and light/dark conditions on the utilization of nitrate and ammonia. the csgs expression levels decreased during dormancy compared to non-dormancy phase of growth. different leaf positions present different ages of the leaf and csgs expression level was highest in apical b ... | 2010 | 19449127 |
| phenolic contribution of south african herbal teas to a healthy diet. | south african herbal teas, rooibos and honeybush, are increasingly enjoyed as healthy alternatives to camellia sinensis teas. they contribute to the diet with bioactive phytochemicals not commonly found in foods. major compounds of rooibos are the unique dihydrochalcone, aspalathin, and its flavone isomers, orientin and isoorientin. honeybush contributes the xanthones, mangiferin and isomangiferin and the flavanones, eriocitrin, narirutin and hesperidin. all these compounds are either c-glucosid ... | 2009 | 19445319 |
| aspergillus acidus from puerh tea and black tea does not produce ochratoxin a and fumonisin b2. | puerh tea is a unique chinese fermented tea. unlike other teas it is stored for a long period of time. aspergillus niger is claimed to be the dominant microorganism in the puerh tea manufacturing process and also to be common on tea in general. a. niger sensu stricto is known to produce the mycotoxins ochratoxin a, fumonisins b(2) and b(4). with this in mind, we performed a preliminary study to determine if production of these mycotoxins by black aspergilli isolated from puerh and black tea can ... | 2009 | 19439385 |
| coffee, black tea and risk of gastric cancer. | to provide information about the association of coffee, black tea with gastric cancer risk. | 2009 | 19430969 |
| green tea catechins, alleviate hepatic lipidemic-oxidative injury in wistar rats fed an atherogenic diet. | in the present study, the efficacy of green tea catechins (gtc from the plant camellia sinensis), with epigallocatechin gallate (egcg), as the major component, was studied in relation to hepatic oxidative abnormalities in atherosclerotic rats. when male albino wistar rats were fed an atherogenic diet for 30 days and then treated with saline for 7 or 15 days, there was a significant decline in hepatic mean activities of antioxidant enzymes (catalase, superoxide dismutase, glutathione peroxidase a ... | 2009 | 19428341 |
| identification, characterization and utilization of unigene derived microsatellite markers in tea (camellia sinensis l.). | despite great advances in genomic technology observed in several crop species, the availability of molecular tools such as microsatellite markers has been limited in tea (camellia sinensis l.). the development of microsatellite markers will have a major impact on genetic analysis, gene mapping and marker assisted breeding. unigene derived microsatellite (ugms) markers identified from publicly available sequence database have the advantage of assaying variation in the expressed component of the g ... | 2009 | 19426565 |
| effect of black tea on histological and immunohistochemical changes in pancreatic tissues of normal and streptozotocin-induced diabetic mice (mus musculus). | the aim of the present study is to evaluate the effect of hot water extract of black tea in regenerating beta cells in streptozotocin-induced diabetic mice. light microscopic examination of pancreatic sections of streptozotocin-induced diabetic mice showed the acinar cells to be small, shrunken, and with deteriorated beta cells. the dose of streptozotocin not only altered the function of beta cells but also damaged the acinar region. the changes in acinar cells were coarsening of endoplasmic ret ... | 2009 | 19425072 |
| effects of sri lankan black tea (camellia sinensis l.) on pregnancy of rats. | the aim of this study was to demonstrate the potential effects of black tea brew of camellia sinensis using sri lankan high grown dust grade no. 1 tea on pregnancy outcome of rats when exposed during early (days 1-7), mid (days 8-14) and late (days 15-21) pregnancy of rats. different doses of black tea brew (mg/ml/day) was orally administered daily during this period to separate groups of rats (n = 6/group): 84 (equivalent to 1.5 cups), 167 (3 cups), 501 (9 cups), and 1336 (24 cups). the results ... | 2009 | 19422356 |
| hepatoprotective and curative properties of kombucha tea against carbon tetrachloride-induced toxicity. | kombucha tea (kt) is sugared black tea fermented with a symbiotic culture of acetic acid bacteria and yeasts, which is said to be tea fungus. kt is claimed to have various beneficial effects on human health, but there is very little scientific evidence available in the literature. in the present study, kt along with black tea (bt) and black tea manufactured with tea fungus enzymes (enzyme-processed tea, et) was evaluated for hepatoprotective and curative properties against ccl4-induced toxicity, ... | 2009 | 19420997 |
| antifungal activity of black tea polyphenols (catechins and theaflavins) against candida species. | the polyphenols catechins and theaflavins in black tea have been shown to possess many medicinal properties, including anticancer activity and some antifungal characteristics, but there have been few studies of their anti-candida activity. in this paper we report the results of our study of the anti-candida activity of tea polyphenols. | 2009 | 19420933 |
| paenibacillus pueri sp. nov., isolated from pu'er tea. | pu'er tea is a fermented drink made from the leaves of the tea plant, camellia sinensis. two novel bacteria, designated strains b09i-3(t) and b13i-1, were isolated during the process of fermentation of this tea. these isolates were gram-positive, endospore-forming, motile rods that grew at 25-42 degrees c and ph 5.5-10.4. the dna g+c content was 56.6-58.4 mol%, the predominant isoprenoid quinone was mk-7 and the predominant cellular fatty acid was anteiso-c(15 : 0) (49.0-50 % of the total). phyl ... | 2009 | 19406782 |
| a thought on the biological activities of black tea. | tea is the most widely used ancient beverage in the world and black tea possesses many biological effects on the organisms. it acts as an effective antioxidant because of its free radical-scavenging and metal-chelating ability. due to this, it is active against inflammation, clastogenesis, and several types of cancer. tea reduces dna damage and mutagenesis due to oxidative stress or the presence of pro-mutagens through antioxidant function, blocking activation pathways of mutagens, suppressing t ... | 2009 | 19399668 |
| anti-cariogenic effects of polyphenols from plant stimulant beverages (cocoa, coffee, tea). | polyphenols occurring in cocoa, coffee and tea can have a role in the prevention of cariogenic processes, due to their antibacterial action. cocoa polyphenol pentamers significantly reduce biofilm formation and acid production by streptococcus mutans and s. sanguinis. in the same way, trigonelline, caffeine and chlorogenic acid occurring in green and roasted coffee interfere with s. mutans adsorption to saliva-coated hydroxyapatite beads. studies carried out on green, oolong and black tea indica ... | 2009 | 19397954 |
| polyphenolic beverages reduce initial bacterial adherence to enamel in situ. | polyphenols are antibacterial and anti-oxidative natural agents. the present in situ study aimed to investigate the effect of different polyphenolic beverages on initial bacterial adherence to enamel in the oral cavity. | 2009 | 19394124 |
| differential display mediated cloning of anthocyanidin reductase gene from tea (camellia sinensis) and its relationship with the concentration of epicatechins. | tea [camellia sinensis (l.) o. kuntze] leaves are a major source of epicatechin (ec) and its gallolyl derivatives epicatechin gallate, epigallocatechin and epigallocatechin gallate, collectively known as epicatechins (ecs). epicatechins are important factors determining tea quality, and they also possess many medicinal properties. to gain further information about the regulation of the biosynthesis of ecs, we cloned the gene encoding anthocyanidin reductase from tea (csanr) by first quantifying ... | 2009 | 19380395 |
| co2 assimilation, ribulose-1,5-bisphosphate carboxylase/oxygenase, carbohydrates and photosynthetic electron transport probed by the jip-test, of tea leaves in response to phosphorus supply. | although the effects of p deficiency on tea (camellia sinensis (l.) o. kuntze) growth, p uptake and utilization as well as leaf gas exchange and chl a fluorescence have been investigated, very little is known about the effects of p deficiency on photosynthetic electron transport, photosynthetic enzymes and carbohydrates of tea leaves. in this study, own-rooted 10-month-old tea trees were supplied three times weekly for 17 weeks with 500 ml of nutrient solution at a p concentration of 0, 40, 80, ... | 2009 | 19379526 |
| [toxic hepatitis due to camellia sinensis: an emerging problem]. | 2009 | 19375821 | |
| phenotyping tea consumers by nutrikinetic analysis of polyphenolic end-metabolites. | an integration of metabolomics and pharmacokinetics (or nutrikinetics) is introduced as a concept to describe a human study population with different metabolic phenotypes following a nutritional intervention. the approach facilitates an unbiased analysis of the time-response of body fluid metabolites from crossover designed intervention trials without prior knowledge of the underlying metabolic pathways. the method is explained for the case of a human intervention study in which the nutrikinetic ... | 2009 | 19374449 |
| effect of aqueous extracts of black and green teas in arsenic-induced toxicity in rabbits. | arsenic causes oxidative stress in the body. its administration (3 mg/kg/day) for 14 days in rabbits resulted in a significant reduction of whole blood glutathione (gsh), and elevation of thiobarbituric acid reactive substances (tbars) and the index of nitrite/nitrate (nox) levels. these are the markers of oxidative stress. both black tea (bt) and green tea (gt) (camellia sinensis), when administered to the arsenic-treated rabbits for 14 days, caused a significant elevation of the depleted gsh l ... | 2009 | 19370537 |
| fluoride levels in various black tea, herbal and fruit infusions consumed in turkey. | the fluoride contents were determined by ion-selective electrode in 26 black tea samples originally produced in turkey, sri lanka, india and kenya, and in 14 herbal and seven fruit infusions originated from turkey. fluoride content in black tea infusions ranged from 0.57 to 3.72 mg/l after 5 min of brewing. higher fluoride levels were found in black teas originated from turkey when compared with teas originated from sri lanka. moreover higher fluoride levels were determined in black tea bags com ... | 2009 | 19345715 |
| tea drinking habits and oesophageal cancer in a high risk area in northern iran: population based case-control study. | to investigate the association between tea drinking habits in golestan province, northern iran, and risk of oesophageal squamous cell carcinoma. | 2009 | 19325180 |
| characterization of pu-erh tea using chemical and metabolic profiling approaches. | in this study, the chemical constituents of pu-erh tea, black tea, and green tea, as well as those of pu-erh tea products of different ages, were analyzed and compared using a chemical profiling approach. differences in tea processing resulted in differences in the chemical constituents and the color of tea infusions. human biological responses to pu-erh tea ingestion were also studied by using ultraperformance liquid chromatography-quadrupole time-of-flight mass spectrometry (uplc-qtofms) in co ... | 2009 | 19320437 |
| jaundice as a misadventure of a green tea (camellia sinensis) lover : a case report. | the case of a 76-year-old retired surgeon and lover of green tea (camellia sinensis) infusions who developed a clinical, sero-biochemical and histological picture of severe subacute hepatitis is reported. the clinical presentation was that of jaundice with asthenia and weight loss. abnormal liver function tests were associated with hyper-gammaglobulinemia, and the transient presence of anti-smooth-muscle antibodies and anca. liver histology showed mixed features of lobular hepatitis with central ... | 2016 | 19317284 |
| comparison of peroxyl radical scavenging capacity of commonly consumed beverages. | the antioxidant potential of commercial beverages against peroxyl radical was determined using the total oxyradical scavenging capacity (tosc) assay. peroxyl radicals generated from thermal homolysis of 2,2'-azobis-amidinopropane oxidize alpha-keto-gamma-methiolbutyric acid to ethylene, which is monitored by gas chromatography. the tosc of each beverage is quantified from its ability to inhibit ethylene generation relative to a control reaction. nine different beverages (green tea, jasmine tea, ... | 2009 | 19280160 |
| protective action of aqueous black tea (camellia sinensis) extract (bte) against ovariectomy-induced oxidative stress of mononuclear cells and its associated progression of bone loss. | the protective action of aqueous black tea extract (bte) against ovariectomy-induced oxidative stress of mononuclear cells and its associated progression of bone loss was demonstrated in this study. eighteen female adult 6-month-old wistar albino rats were divided into three groups: sham-control (a), bilaterally ovariectomized (b) and bilaterally ovariectomized + bte supplemented (c). studies included the measurement of oxidative (nitric oxide, lipid peroxidation) and antioxidative (superoxide d ... | 2009 | 19277962 |
| evaluation of free radical-scavenging and antihemolytic activities of quince (cydonia oblonga) leaf: a comparative study with green tea (camellia sinensis). | this study aimed to determine the phenolic profile and to investigate the antioxidant potential of quince (cydonia oblonga) leaf, comparing it with green tea (camellia sinensis). for these purposes, methanolic extracts were prepared and phenolics content of quince leaf was determined by hplc/uv. the antioxidant properties were assessed by folin-ciocalteu reducing capacity assay and by the ability to quench the stable free radical 2,2'-diphenyl-1-picrylhydrazyl (dpph) and to inhibit the 2,2'-azob ... | 2009 | 19271320 |
| regulation of cell growth through cell cycle arrest and apoptosis in hpv 16 positive human cervical cancer cells by tea polyphenols. | cervical cancer is the second most common malignant neoplasm in women, in terms of both incidence and mortality rates worldwide. the polyphenolic constituents of tea (camellia sinensis) have gained considerable attention because of its anti-cancer properties against a variety of cancers. here we studied the effects of green and black tea polyphenols (gtp and btp), on cellular proliferation and cell death in the siha cells (human cervical cancer) expressing the human papilloma virus (hpv)-16. the ... | 2010 | 19271153 |
| separation of catechins and methylxanthines in tea samples by capillary electrochromatography. | in this paper, the simultaneous separation of several polyphenols such as (+)-catechin, (-)-epicatechin, (-)-epigallocatechin, theophylline, caffeine in green and black teas by capillary electrochromatography (cec) was developed. several experimental parameters such as stationary phase type, mobile phase composition, buffer and ph, inner diameter of the columns, sample injection, were evaluated to obtain the complete separation of the analysed compounds. baseline resolution of the studied polyph ... | 2009 | 19266552 |
| long-term tea intake is associated with reduced prevalence of (type 2) diabetes mellitus among elderly people from mediterranean islands: medis epidemiological study. | we sought to evaluate the link between long-term tea intake and prevalence of type 2 diabetes mellitus, in a sample of elderly adults. | 2009 | 19259345 |
| biogenic synthesis of au and ag nanoparticles using aqueous solutions of black tea leaf extracts. | we explored the application of three different aqueous solutions derived from black tea leaf extracts in the synthesis of au and ag nanoparticles. the plain tea leaf broth, as well as that containing the ethyl acetate extract of tea leaves, were found to be extremely efficient, leading to rapid formation of stable nanoparticles of various shapes: spheres, trapezoids, prisms and rods. for a given metal ion precursor, the kinetics of particle synthesis were remarkably similar in these two solution ... | 2009 | 19250808 |
| centrifugal precipitation chromatography, a powerful technique for the isolation of active enzymes from tea leaves (camellia sinensis). | centrifugal precipitation chromatography was developed approximately 10 years ago. in contrast to other counter-current chromatographic techniques, the centrifugal precipitation chromatography system is operated with two mutually miscible solutions separated by a cut-off membrane. centrifugal precipitation chromatography was firstly introduced for the separation of proteins using an ammonium sulfate gradient. in this study we describe a novel approach using solvent-based protein precipitation fo ... | 2009 | 19233373 |
| a comparison of aluminum levels in tea products from hong kong markets and in varieties of tea plants from hong kong and india. | this study project aimed to investigate the concentrations of aluminum (al) in tea products available in hong kong markets. tea samples consisting of 47 different tea bags and 28 samples of tea leaves were analysed for concentrations of al. all tea samples released al (0.70-5.93 mg l(-1)) during a standard infusion period. in comparison to the joint fao/who provisional tolerable weekly intake guideline of 7 mg al kg(-1) body weight, it was concluded that tea made with these tea leaves will not i ... | 2009 | 19230955 |
| green and black tea consumption and risk of stroke: a meta-analysis. | experimental models of stroke provide consistent evidence of smaller stroke volumes in animals ingesting tea components or tea extracts. to assess whether a similar association of black or green tea consumption with reduced risk is evident in human populations, we sought to identify and summarize all human clinical and observational data on tea and stroke. | 2009 | 19228856 |
| [consumption of tea among population on the far north of russia]. | aim of present study was the getting data on tea and coffee consumption among population on the far north by 24-hour recall of dietary intake. about 84% of population have consumed the black tea. mean daily black and green tea intake among all population were 335 ml and 49 ml, correspondingly. | 2008 | 19227859 |
| [historical consideration of tea trees and tea flowers, especially regarding the use of tea flowers as food]. | not only tea leaves, but also many kinds of plants have been used as tea, even those plants not belonging to camellia sinensis, and they should be called "tea out of tea" in the lucidophyllous forest zone. generally, the tea leaf is drank after being decocted (almost boiled). the growth distribution of tea ranges in a belt-like zone of 30-40 degrees north latitude. therefore, tea might have grown wild as "yamacha (mountain tea)" from ancient times in japan as well as china. the first recored of ... | 2008 | 19227653 |
| the ameliorative effect of black tea extract and quercetin on bisphenol a-induced cytotoxicity. | the purpose of our study was, to explore the possible ameliorating effects of black tea extract and quercetin, against bisphenol a-induced cytotoxicity. for this, human red blood corpuscles (rbc) were taken as the model. blood samples collected in edta vials from healthy adults were used for preparation of rbc suspension. this suspension was treated with bisphenol a (0-150 microg/ml) with and without black tea extract or quercetin (0-200 microg/ml). the results showed that addition of bisphenol ... | 2009 | 19226967 |
| coffee and green tea as a large source of antioxidant polyphenols in the japanese population. | food and beverages rich in polyphenols with antioxidant activity are highlighted as a potential factor for risk reduction of lifestyle related diseases. this study was conducted to elucidate total polyphenol consumption from beverages in japanese people. total polyphenol (tp) contents in beverages were measured using a modified folin-ciocalteu method removing the interference of reduced sugars by using reverse-phase column chromatography. a beverage consumption survey was conducted in the tokyo ... | 2009 | 19187022 |
| in vitro inhibition of helicobacter pylori urease with non and semi fermented camellia sinensis. | helicobacter pylori is the etiological agent in duodenal and peptic ulcers. the growing problem of antibiotic resistance by the organism demands the search for novel compounds, especially from natural sources. this study was conducted to evaluate the effect of camellia sinensis extracts on the urease enzyme that is a major colonization factor for h. pylori. | 2009 | 19172056 |
| in vitro comparison of visual and computer-aided pre- and post-tooth shade determination using various home bleaching procedures. | due to inter- and intraexaminer differences, subjective evaluation of tooth color is deemed problematic. | 2009 | 19167533 |
| [liver injury induced by "natural remedies": an analysis of cases submitted to the spanish liver toxicity registry]. | toxic liver damage associated with the use of natural remedies is a growing health problem. | 2008 | 19159172 |
| study on discrimination of roast green tea (camellia sinensis l.) according to geographical origin by ft-nir spectroscopy and supervised pattern recognition. | rapid discrimination of roast green tea according to geographical origin is crucial to quality control. fourier transform near-infrared (ft-nir) spectroscopy and supervised pattern recognition was attempted to discriminate chinese green tea according to geographical origins (i.e. anhui province, henan province, jiangsu province, and zhejiang province) in this work. four supervised pattern recognitions methods were used to construct the discrimination models based on principal component analysis ... | 2009 | 19155188 |
| trapping effects of green and black tea extracts on peroxidation-derived carbonyl substances of seal blubber oil. | green and black tea extracts were employed to stabilize seal blubber oil at 60 degrees c for 140 h. on the basis of the headspace spme-gc-ms analysis, with the addition of green/black tea extracts, the contents of acetaldehyde, acrolein, malondialdehyde, and propanal, four major lipid peroxidation products, were reduced. the inhibition rates of acrolein formation by green tea and black tea extracts were 98.40 and 96.41% respectively, and were 99.17 and 98.16% for malondialdehyde, respectively, m ... | 2009 | 19154106 |
| separation of proanthocyanidins isolated from tea leaves using high-speed counter-current chromatography. | the proanthocyanidin extract from tea (camellia sinensis) leaves was purified for the further study of the biological role of proanthocyanidins in blister blight leaf disease of tea, which is caused by the fungus exobasidium vexans. an aqueous acetone extract of proanthocyanidins prepared from healthy tea leaves was partially purified using sephadex lh-20 chromatography. the crude proanthocyanidin extract obtained was fractionated with high-speed counter-current chromatography (hsccc) using the ... | 2009 | 19136115 |
| green tea, black tea consumption and risk of lung cancer: a meta-analysis. | studies investigating the association of green tea and black tea consumption with lung cancer risk have reported inconsistent findings. to provide a quantitative assessment of this association, we conducted a meta-analysis on the topic. studies were identified by a literature search in pubmed from 1966 to november 2008 and by searching the reference lists of relevant studies. summary relative risk (rr) estimates and their corresponding 95% confidence intervals (cis) were calculated based on rand ... | 2009 | 19128856 |
| modulation of aromatase activity by diet polyphenolic compounds. | estrogens are involved in physiological actions related to reproduction, body fat distribution, and maintenance of bone mass and are also related to the pathogenesis of estrogen-dependent cancers. the aim of this work was to study the effect of polyphenols on estrogen synthesis. the effect of polyphenols and polyphenolic-rich beverages on aromatase activity was tested in jar cells (a choriocarcinoma cell line) through the tritiated water release assay. some of the tested polyphenols inhibited es ... | 2006 | 19127721 |
| interaction between warfarin and black tea. | 2009 | 19126824 | |
| residues of lambda-cyhalothrin in tea. | field experiments were conducted at two places in tamil nadu (india) during dry season of 2006 to determine the residues of lambda-cyhalothrin in fresh green tea leaves and black tea. residues were quantified at different harvest intervals of '0' (3h), 1st, 3rd, 5th, 7th, 10th and 14th day after insecticide application. persistence, dissipation pattern, half-life value and safe harvest interval of the insecticide in tea were calculated. residues of lambda-cyhalothrin dissipated exponentially aft ... | 2009 | 19116161 |
| delayed effects of coffee, tea and sucrose on postprandial glycemia in lean, young, healthy adults. | in observational studies, habitual coffee consumption has been linked to a lower risk of type 2 diabetes. we hy-pothesized that the mechanism may be related to delayed effects on postprandial glycemia. the aim of this study is to investigate the glycemic and insulinemic effects of consumption of caffeinated and decaffeinated coffee, sweetened and unsweetened, tea and sucrose, 1 h prior to a high carbohydrate meal. on separate occasions in random order, lean young healthy subjects (n = 8) consume ... | 2008 | 19114405 |
| effects of green and black tea biocomposites on endogenous synthesis, metabolism and genotoxic effect of carcinogenic n-nitrosodimethylamine. | to study the modifying effect of green and black tea biocomposites on endogenous synthesis and genotoxic action of the carcinogenic n-nitrosodimethylamine. | 2008 | 19112429 |
| higher regular coffee and tea consumption is associated with reduced endometrial cancer risk. | several studies have investigated the associations between diet and endometrial cancer, but few have focused specifically on coffee and tea. in a hospital-based case-control study, we examined the associations between endometrial cancer risk and usual consumption of coffee, decaffeinated coffee, and black tea among 541 women with endometrial cancer and 541 women with an intact uterus but without a cancer diagnosis seen at roswell park cancer institute (buffalo, new york) between 1982 and 1998. d ... | 2009 | 19107932 |
| in vitro anti-adhesive activity of green tea extract against pathogen adhesion. | camellia sinensis polysaccharide has been reported to possess anti-adhesive activity against pathogens. the present study was designed to investigate whether hot water extracts obtained from green tea leaves might inhibit pathogen adhesion to human or mouse cell lines. green tea extract-4 (csi-4) with the maximum yield of 4% (w/v) is composed of a major proportion of carbohydrates containing 40% uronic acids, but lack of catechins. it showed strong inhibitory activities against hemagglutination ... | 2009 | 19107860 |
| green and black tea are equally potent stimuli of no production and vasodilation: new insights into tea ingredients involved. | epidemiological studies suggest that consumption of tea is associated with beneficial cardiovascular effects. since different types of tea are consumed throughout the world, a question of much interest is whether green tea is superior to black tea in terms of cardiovascular protection. we therefore compared the effects of green and black tea on nitric oxide (no) production and vasodilation and elucidated the tea compounds involved. we chose a highly fermented black tea and determined concentrati ... | 2009 | 19101751 |
| epigallocatechin gallate from green tea (camellia sinensis) increases lifespan and stress resistance in caenorhabditis elegans. | epigallocatechin gallate (egcg) is a major green tea polyphenol with pronounced antioxidative activity. the effects of egcg on lifespan and stress resistance in wild-type n2 and transgenic strains of caenorhabditis elegans [ hsp-16.2/gfp, mev-1(kn1), fem-1(hc17)] were investigated. the expression of hsp-16.2 (induced by the pro-oxidant juglone) and the intracellular levels of h (2)o (2) were inhibited by egcg treatment. daily administration of 220 mum egcg increased the mean lifespan by 10.14 % ... | 2009 | 19085685 |
| antihypercholesterolemic effect of chinese black tea extract in human subjects with borderline hypercholesterolemia. | a water-soluble extract of a traditional chinese black tea (pu-ehr) has been shown to precipitate mixed bile salt micelles in foods. in addition, long-term ingestion of this black tea extract (bte) significantly reduces blood cholesterol levels in rats. we investigated the effects of bte tablets (a formula designed to enhance compliance) as a dietary supplement in a 3-month double-blind randomized group comparison study in borderline hypercholesterolemic human subjects (n = 47). all subjects ing ... | 2008 | 19083445 |
| accumulation of catechins in tea in relation to accumulation of mrna from genes involved in catechin biosynthesis. | catechins are a group of polyphenols found in tea (camellia sinensis var. sinensis) at high levels. they are beneficial for health. from the study on accumulation of catechins in shoots and mature leaves of a tea cultivar, oolong no. 17, using high-performance liquid chromatography (hplc), it was found that the amounts of most catechins in the shoots were higher than those in the mature leaves, with an exception of catechins gallate (cg) that was found in trace amounts in both the shoots and mat ... | 2009 | 19081728 |
| caging a beast in the inflammation arena: use of chinese medicinal herbs to inhibit a late mediator of lethal sepsis, hmgb1. | sepsis refers to a systemic inflammatory response syndrome resulting from a microbial infection, which kills > 225,000 people annually in the u.s. alone. the high mortality of sepsis is partly mediated by bacterial endotoxin, which stimulates macrophages/monocytes to sequentially release early (e.g., tnf) and late (e.g., hmgb1) pro-inflammatory cytokines. although early proinflammatory cytokines may be protective against infection, excessive accumulation of late-acting proinflammatory mediators ... | 2008 | 19079688 |
| determination of 8-oxo-2'-deoxyguanosine and creatinine in murine and human urine by liquid chromatography/tandem mass spectrometry: application to chemoprevention studies. | urinary 8-oxo-7,8-dihydro-2'-deoxyguanosine (8-oxodg) represents a non-invasive biomarker for oxidative stress and may be useful for monitoring chemotherapeutic and chemopreventive interventions associated with cancer-related alterations in oxidative stress. we describe the development and validation of two separate liquid chromatography/tandem mass spectrometry (lc/ms/ms) selected reaction monitoring (srm) methods for the determination of 8-oxodg and creatinine in both murine and human urine us ... | 2009 | 19072863 |
| the study of antioxidant and anticarcinogenic green tea and black tea. | tea is one of the most popular beverages consumed worldwide. the relationship between tea consumption and human cancer incidence is an important concern. the effect of tea extract and ingredients, polyphenol and caffeine on the mutagenicity of sodium azide was examined in vitro by using salmonella typhimurium ta100, ta98 and ta1535 in the presence of induced rat liver s9 fractions. experimental studies have demonstrated the significant antimutagenic and anticarcinogenic effects of both green and ... | 2007 | 19069905 |
| insect pests of tea and their management. | globally, 1031 species of arthropods are associated with the intensively managed tea camellia sinensis (l.) o. kuntze monoculture. all parts of the plant, leaf, stem, root, flower, and seed, are fed upon by at least one pest species, resulting in an 11%-55% loss in yield if left unchecked. there has been heavy use of organosynthetic pesticides since the 1950s to defend the plant against these pests, leading to rapid conversion of innocuous species into pests, development of resistance, and undes ... | 2009 | 19067632 |
| green tea, soy, and mammographic density in singapore chinese women. | there is increasing evidence from observational studies that breast cancer risk is inversely associated with soy and green tea consumption. we investigated the effects of these two dietary agents on mammographic density, a well-established biomarker for breast cancer risk, in a cross-sectional analysis of mammograms and validated food frequency questionnaires from 3,315 chinese women in singapore. percent mammographic density (pmd) was assessed using a reproducible computer-assisted method. we u ... | 2008 | 19064551 |
| inhibition of mammalian thioredoxin reductase by black tea and its constituents: implications for anticancer actions. | black tea is recently reported to have anti-carcinogenic effects through pro-oxidant property, but the underlying mechanisms remain unclear. mammalian cytosolic thioredoxin reductase (trxr1) is well -known for its anti-oxidation activity. in this study, we found that black tea extract (bte) and theaflavins (tfs), the major black tea polyphenols, inhibited the purified trxr1 with ic(50) 44 microg/ml and 21+/-1 microg/ml, respectively. kinetics of tfs exhibited a mixed type of competitive and non- ... | 2009 | 19059456 |
| inhibitory effect of tea polyphenols on hepatic preneoplastic foci in wistar rats. | tea (camellia sinensis) is one of the most widely used beverages worldwide and tea consumption has been shown to have an inverse correlation to the incidence of human cancers in epidemiological and experimental studies. in the present study, the protective effects of green tea polyphenols (gtp) and black tea polyphenols (btp) in wistar rats were assessed by medium-term bioassay, using altered hepatic foci (ahf) as end point. animals were exposed to a single dose of diethylnitrosamine (den; 200 m ... | 2008 | 19057850 |
| green tea (camellia sinensis) attenuates nephropathy by downregulating nox4 nadph oxidase in diabetic spontaneously hypertensive rats. | green tea (gt), through its antioxidant properties, may be useful to treat or prevent human diseases. because several lines of evidence suggest that oxidative stress contributes to the pathogenesis of diabetic nephropathy, we tested the hypothesis that gt prevents diabetes and hypertension-related renal oxidative stress, attenuating renal injury. spontaneously hypertensive rats (shr) with streptozotocin-induced diabetes and nondiabetic shr were treated daily with tap water or freshly prepared gt ... | 2009 | 19056645 |
| a study on toxicity of gasoline and gm-10 on liver of mice and it's amelioration by black tea extract. | the aim of present study is to investigate the ameliorative effect of black tea extract on gasoline and gm-10 induced toxicity in liver of mice. eighty healthy male mice weighing 38-40 g approximately were divided into eight groups which included untreated control and various treated groups. mice were treated with gasoline 462 mg/kg/day and gm-10 low dose (206 mg/kg/day) and high dose (412 mg/kg/day) subcutaneously for 30 days. black tea extract was given as 2 g/100 ml drinking water (2% w/v) in ... | 2008 | 19051608 |
| theaflavins from black tea, especially theaflavin-3-gallate, reduce the incorporation of cholesterol into mixed micelles. | tea is one of the most widely consumed beverages in the world and may be associated with reduced heart disease rates. theaflavins, which are formed in the production of black tea, have been suggested being responsible for the blood-cholesterol-lowering (bcl) effects of tea. we hypothesized that the effect of theaflavins on bcl could be through interference in the formation of dietary mixed micelles, which could result in reduced intestinal cholesterol absorption. micelles were produced by mixing ... | 2008 | 19049290 |
| chemoprotective properties of rooibos (aspalathus linearis), honeybush (cyclopia intermedia) herbal and green and black (camellia sinensis) teas against cancer promotion induced by fumonisin b1 in rat liver. | the chemoprotective properties of unfermented and fermented rooibos (aspalathus linearis) and honeybush (cyclopia intermedia) herbal teas, and green and black teas (camellia sinensis) were investigated against fumonisin b1 (fb1) promotion in rat liver utilizing diethylnitrosamine (den) as cancer initiator. the various teas differently affected the clinical chemical parameters associated with liver and kidney damage associated with fb1 suggesting specific fb1/iron/polyphenolic interactions. green ... | 2009 | 19041360 |
| soft drink intake is associated with diet quality even among young japanese women with low soft drink intake. | unsweetened traditional japanese tea has long been the main beverage consumed in japan, with soft drinks only recently forming a part of people's diets. evidence suggests an association between soft drink intake and poor diet quality among youth in the united states. the association is not yet fully examined in the population with relatively low intake level of soft drinks such as the current japanese population. | 2008 | 19027402 |
| an aqueous extract of green tea camellia sinensis increases expression of th1 cell-specific anti-asthmatic markers. | the present study provides evidence of the anti-asthmatic signaling activity of an aqueous fraction of green tea using specific in vitro and in vivo assays in an ovalbumin-induced asthmatic model. mice sensitized to ovalbumin were orally administered an aqueous extract of camellia sinensis. the lungs of these mice were then examined by hematoxylin and eosin staining and elisa analysis to measure cytokine expression. the aqueous extract of camellia sinensis exhibited potent anti-asthmatic activit ... | 2008 | 19020774 |
| long-term caffeine consumption reverses tumor-induced suppression of the innate immune response in adult mice. | caffeine (1,3,7-trimethylxanthine), the active principle alkaloid of coffee ( coffea arabica) and tea ( camellia sinensis) possesses a restraining effect on tumor-induced suppression of the specific immune response in adult mice. the present study deals with the effect of long-term consumption of caffeine in the development of ehrlich ascites carcinoma (eac) cells in adult swiss female mice, in relation to the innate immune response and tumor growth. although the consumption of caffeine alone fo ... | 2008 | 19016405 |
| caffeine content of brewed teas. | caffeine is the world's most popular drug and can be found in many beverages including tea. it is a psychostimulant that is widely used to enhance alertness and improve performance. this study was conducted to determine the concentration of caffeine in 20 assorted commercial tea products. the teas were brewed under a variety of conditions including different serving sizes and steep-times. caffeine was isolated from the teas with liquid-liquid extraction and quantitated by gas chromatography with ... | 2008 | 19007524 |
| inhibition of hepatoma cell invasion beneath mesothelial-cell monolayer by sera from tea- and related component-treated rats and their modes of action. | the bioavailability and action of teas on the invasion of a rat ascites hepatoma cell line, ah109a, were determined and their modes of action were by co-culturing the cancer cells with a rat mesentery-derived mesothelial-cell (m-cell) monolayer in the presence of sera from rats orally given teas and their component, (-)-epigallocatechin gallate (egcg). the rat sera obtained 2 and 5 hr after oral intubation of a low concentration of green, oolong, or black tea, or egcg significantly inhibited ah1 ... | 2001 | 19003330 |
| effects of green, oolong and black teas and related components on the proliferation and invasion of hepatoma cells in culture. | the effects of teas and related components on the proliferation and invasion of cancer cells were examined by employing both in vitro proliferation and invasion assay systems. powdered green, oolong and black tea extracts dose-dependently inhibited proliferation and invasion of a rat ascites hepatoma cell line of ah109a but did not affect the proliferation of the normal mesentery-derived mesothelial cells (m-cells) isolated from rats; higher concentrations of powdered oolong and black teas could ... | 1999 | 19003122 |
| in vitro and in vivo anti-allergic effects of 'benifuuki' green tea containing o-methylated catechin and ginger extract enhancement. | 'benifuuki', a tea (camellia sinensis l.) cultivar in japan, is rich in anti-allergic epigallocatechin-3-o-(3-o-methyl) gallate (egcg3''me). 'benifuuki' green tea and simultaneous addition of ginger extract remarkably suppressed cytokine (tnf-alpha and mip-1alpha) secretion from mouse bone marrow-derived mast cells after antigen stimulation and, as expected, suppressed delay-type allergy. after drinking 'benifuuki' green tea containing 43.5 mg of egcg and 8.5 mg of egcg3''me, the auc (area under ... | 2007 | 19003003 |
| antioxidative and anti-carcinogenic activities of tea polyphenols. | tea (camellia sinensis, theaceace), a popular beverage consumed world-wide, has been studied for its preventive effects against cancer as well as cardiovascular, neurodegenerative, and other diseases. most of the proposed beneficial effects have been attributed to the polyphenolic compounds in tea, but the nature of these activities and the molecular mechanisms of their actions remain unclear. tea polyphenols are known to be strong antioxidants. prevention of oxidative stress, modulation of carc ... | 2009 | 19002670 |
| microwave heating of tea residue yields polysaccharides, polyphenols, and plant biopolyester. | microwave heating was used to produce aqueous-soluble components from green, oolong, and black tea residues. heating at 200-230 degrees c for 2 min extracted 40-50% of polysaccharides and 60-70% of the polyphenols. solubilization of arabinose and galactose by autohydrolysis occurred with heating above 170 degrees c, whereas heating above 200 degrees c was necessary to solubilize xylose. catechins were soluble in water by heating at low temperature (110 degrees c); however, new polyphenols having ... | 2008 | 18998700 |