Publications
| Title | Abstract | Year Filter | PMID(sorted descending) Filter |
|---|
| genotoxicity testing of different types of beverages in the drosophila wing somatic mutation and recombination test. | five wines and one brandy of spanish origin as well as three herbal teas and ordinary black tea were tested for genotoxicity in the wing somatic mutation and recombination test (smart) which makes use of the two recessive wing cell markers multiple wing hairs (mwh) and flare (flr3) on the left arm of chromosome 3 of drosophila melanogaster. 3-day-old larvae trans-heterozygous for these two markers were fed the beverages at different concentrations and for different feeding periods using drosophi ... | 1994 | 8206441 |
| antioxidative effects of black tea theaflavins and thearubigin on lipid peroxidation of rat liver homogenates induced by tert-butyl hydroperoxide. | the antioxidative activity of theaflavins (tfs) and thearubigin (tr) purified from the infusion of black tea leaves was examined using the tert-butyl hydroperoxide-induced lipid peroxidation of rat liver homogenates. the concentrations which produced 50% inhibition of lipid peroxidation (ic50) by theaflavin (tf), theaflavin monogallate-a (tfm-a), and tr were 4.88 x 10(-4), 4.09 x 10(-4), and 4.95 x 10(-4%) (w/v), respectively. the anti-oxidative activity of these compounds was higher than that o ... | 1994 | 8148805 |
| effects of seed saponins of thea sinensis l. (ryokucha saponin) on alcohol absorption and metabolism. | we evaluated the effects of the seed saponins of thea sinensis l. on alcohol absorption and metabolism in rats and mice. an ethanolic extract from the seeds of t. sinensis was orally administered to the rats 1 hr before or 0.5 hr after administration of ethanol (2 g/kg), and the blood ethanol assayed 0.5, 1, 2, 3, and 4 hr after ethanol administration. the ethanol level decreased after both pre- and post-administration of the extract. the extract was further purified to obtain a saponin fraction ... | 1993 | 8147976 |
| the influence of dietary factors on the risk of urinary stone formation. | the action of various beverages and foods on the composition of the urine in the circadian rhythm and in the 24-hour urine has been investigated under standardized conditions. orange juice leads to a significant increase of urinary ph and citric acid excretion. black tea leads to a raised excretion of oxalic acid by only 7.9%. in the short term, beer increases diuresis, but afterwards leads to a compensatory antidiuresis with increased risk of stone formation. depending on their composition, min ... | 1993 | 8146611 |
| [the results of comprehensive caries prophylaxis in children under endemic goiter conditions]. | caries prevention was carried out in 800 children aged under 7 living in regions endemic for goiter. the complex of preventive measures included natrium fluoratum tablets (polfa, poland), a combination of fluoride lacquer with 3% remodent, azerbaijan black tea tincture with f, 10 mg/l, all of these combined with antistrumin, an iodine-containing drug. clinical data, enamel acid solubility values, data of microbiologic examinations of dental deposit, status of natural antibacterial defense of tis ... | 2013 | 8108830 |
| [inhibition of the infectivity of influenza virus by black tea extract]. | we determined whether black tea extract inhibits the infectivity of influenza virus to mice. when mice were inoculated intranasally with 10(5.3) pfu influenza viruses (10(1.3) ld50), their body weight decreased and all died within 10 days. whereas, when mice were inoculated i.n. with the mixture of influenza viruses and 2% (w/w) black tea extract, 5 min after mixing, all mice showed normal body-weight increase and survived. neutralizing antibody to influenza virus was not detected in nine of 10 ... | 1994 | 8089547 |
| effects of green tea and black tea on 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone bioactivation, dna methylation, and lung tumorigenesis in a/j mice. | previous studies in our laboratory showed that decaffeinated green tea and black tea extracts inhibited 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (nnk)-induced tumorigenicity in a/j female mice. in order to understand the mechanism of the inhibitory action, we examined the effects of decaffeinated green tea, black tea, and tea components on the metabolic activation of nnk in vitro and in vivo in this animal model. when added to incubation mixtures containing mouse lung microsomes, decaffein ... | 1994 | 8062257 |
| prevention of heterocyclic amine formation by tea and tea polyphenols. | heterocyclic amines (hcas), formed during the cooking of meats and fish, are thought to be the genotoxic carcinogens associated with important types of human cancer in meat-eating populations, such as cancer of the breast, colon or pancreas. we studied the effect of black or green tea, and of the tea polyphenols theaflavine gallate (tfg, black tea) and epigallocatechin gallate (egcg, green tea) on the formation of typical hcas, 2-amino-3,8-dimethylimidazo[4,5-f]quinoxaline (meiqx), and 2-amino-1 ... | 1994 | 8062207 |
| effects of green and black tea on hepatic xenobiotic metabolizing systems in the male f344 rat. | 1. the induction of phase i and ii enzymes in the liver of the male f344 rat drinking 2% (w/v) solutions of green or black tea for 6 weeks was investigated. also studied were glutathione (gsh) and cyst(e)ine in blood, liver and kidney, as well as serum cholesterol, hdl cholesterol, triglycerides, and total and free testosterone. 2. the total carbon monoxide-discernible liver p450, b5 and nadph-cytochrome c(p450) reductase activities were similar in all groups. 3. there were significant increases ... | 1994 | 8017087 |
| inhibitory effects of black tea, green tea, decaffeinated black tea, and decaffeinated green tea on ultraviolet b light-induced skin carcinogenesis in 7,12-dimethylbenz[a]anthracene-initiated skh-1 mice. | in a previous study (z. y. wang et al., cancer res., 52: 1162-1170, 1992), we found that administration of a water extract of green tea leaves as the sole source of drinking fluid inhibited ultraviolet b light (uvb)-induced carcinogenesis in skh-1 mice previously initiated with 7,12-dimethylbenz[a]anthracene (dmba). in the present study, we compared the effects of black tea, green tea, decaffeinated black tea, and decaffeinated green tea on uvb-induced skin carcinogenesis in dmba-initiated skh-1 ... | 1994 | 8012962 |
| effect of the hot-water extract of black tea (camellia sinensis) on the rat diaphragm. | 1994 | 7997479 | |
| studies of cuticle drugs from natural sources. ii. inhibitory effects of prunus plants on melanin biosynthesis. | the inhibitory effects of 50% ethanolic extracts from dried leaves of 38 plants collected in the herbal garden of kinki university were investigated in vitro on melanin biosynthesis which is closely related to hyperpigmentation. of the 38 extracts, prunus yedoensis, p. zippeliana, p. amygdalus, p. persica, p. armeniaca, thea sinensis and chaenomeles sinensis showed a potent inhibition of tyrosinase, the enzyme which converts 3-(3,4-dihydroxyphenyl)alanine (dopa) to dopachrome in the biosynthetic ... | 1994 | 7874069 |
| effect of flavan-3-ol tannins purified from camellia sinensis on lipid peroxidation of rat heart mitochondria. | we induced lipid peroxidation in rat heart mitochondria with feso4 and compared the inhibitory effect of various flavan-3-ol tannins on it. these tannins were purified from chinese tea (camellia sinensis). oxygen consumption and malondialdehyde formation were used to quantitate the amount of lipid peroxidation. the free radical scavenger activity of tannins was then measured with a diphenyl-p-picrylhydrazyl method. these tannins significantly inhibited lipid peroxidation at micromolar concentrat ... | 1994 | 7872240 |
| antibacterial activity of tea (camellia sinensis) and coffee (coffee arabica) with special reference to salmonella typhimurium. | extracts of black tea, japanese green tea, china tea or coffee inhibited the growth of various bacteria causing diarrhoeal diseases. tea or coffee also showed bactericidal activity against vibrio cholerae, salmonella typhimurium and salmonella typhi. | 1994 | 7868837 |
| green and black tea consumption by humans: impact on polyphenol concentrations in feces, blood and urine. | the objective of the study was to determine the effects of green tea, black tea and decaffeinated black tea consumption on urinary and fecal excretions and whole blood and blood serum concentrations of polyphenols. the 56 day study was divided into four randomly arranged experimental periods of 14 days each during which the 10 healthy adult subjects consumed a laboratory controlled, constant, measured diet based on ordinary foods. during separate periods, subjects received no tea, green tea, reg ... | 1994 | 7855093 |
| effect of tea on iron absorption from the typical tunisian meal 'couscous' fed to healthy rats. | black and green tea decoctions are popular beverages in tunisia, especially after eating. our study was performed to examine the effect of graded amounts of black and green tea decoction prepared under realistic tunisian conditions on nonheme iron absorption from a typical tunisian meal, 'couscous', by extrinsic radioiron labeling in rats. concentrations of 300, 200 and 100 micrograms/ml of black tea decreased dramatically nonheme iron bioavailability from couscous, but 50 micrograms/ml did not ... | 1994 | 7832583 |
| chalcone synthase from camellia sinensis: isolation of the cdnas and the organ-specific and sugar-responsive expression of the genes. | three full-length cdnas (chs1, chs2 and chs3) encoding chalcone synthase (chs; ec 2.3.1.74) were isolated from young leaves of camellia sinensis. each cdna encoded 389 amino acid residues, which showed 93-96% identity to one another. oligonucleotides were synthesized on the basis of the 5'-untranslated sequences of the cdnas and their corresponding transcripts could be distinguished. the chs1, chs2 and chs3 transcripts were abundant in the leaves and stems. after an initial treatment with water ... | 1994 | 7820373 |
| antioxidant properties of fractions and polyphenol constituents from green, oolong and black teas. | green, oolong and black teas were extracted with water, and then the water extracts were extracted separately with three types of solvent, chloroform, ethyl acetate and butanol, to obtain eight fractions. major flavanol was extracted by etoac, while most of the alkaloid was in the chloroform fraction. thearubigin was greatest in the butanol fraction, and most of the amino acid remained in the water fraction. all fractions were systematically analyzed by uv spectrophotometer and reverse phase hpl ... | 1993 | 7809277 |
| [effect of natural complexes of biologically active substances on liver regeneration in alcohol poisoning]. | hepatoprotective effect of natural substances obtained from extracts of grape combs, leaves of green and black tea were studied in liver tissue of ethanol-consuming rats by means of evaluation of the neutral lipid fractions and phospholipids as well as by measurement of glucose and nicotinamide coenzymes nad+ and nadp in blood. in all the animal groups treated with these vegetable extracts content of total phospholipids, decreased after the ethanol treatment, was increased, while fraction compos ... | 1995 | 7793089 |
| detection of genetic diversity in tea (camellia sinensis) using rapd markers. | camellia sinensis is a beverage tree crop native to southeast asia and introductions have been made into several nonindigenous countries. no systematic assessment of genetic variability in tea has been done anywhere. in this study, random amplified polymorphic dna (rapd) analysis was used to estimate genetic diversity and taxonomic relationships in 38 clones belonging to the three tea varieties, assamica, sinensis, and assamica ssp. lasiocalyx. extensive genetic variability was detected between ... | 1995 | 7774794 |
| a new glucuronide saponin from tea leaves (camellia sinensis var. sinensis. | a new glucuronide saponin (1) was isolated as its methyl ester (2) from the leaves of camellia sinensis var. sinensis. on the basis of its spectral data and the results of chemical degradation, the structure was elucidated to be 3-o-[beta-d-galactopyranosyl(1-->2)-[beta-d- xylopyranosyl(1-->2)-alpha-l-arabinopyranosyl(1-->3)]- beta-d-glucuronopyranosyl]-21-o-cinnamoyl-16,22-di-o-acetylbarr ingtogenol c. | 1994 | 7765596 |
| trans- and cis-linalool 3,6-oxide 6-o-beta-d-xylopyranosyl-beta-d-glucopyranosides isolated as aroma precursors from leaves for oolong tea. | new glycosidic aroma precursors (1 and 2) of the main volatile constituents, trans- and cis-linalool 3,6-oxides (linalool oxides i and ii), were isolated from oolong tea leaves (camellia sinensis var. sinensis cv. maoxie). the isolation was guided by an enzymatic hydrolysis with acetone powder prepared from fresh tea leaves (cv. yabukita) followed by gc or gc-ms analyses. chromatographic purification of hot water extracts of the tea leaves on active charcoal, amberlite xad-2, and sephadex lh-20 ... | 1994 | 7765491 |
| geranyl 6-o-beta-d-xylopyranosyl-beta-d-glucopyranoside isolated as an aroma precursor from tea leaves for oolong tea. | a new geranyl glycoside, geranyl 5-o-beta-d-xylopyranosyl-beta-d-glucopyranoside was isolated as an aroma precursor from tea leaves (camellia sinensis var. sinensis cv shuixian) for oolong tea. the isolation was guided by a two-phase acid hydrolysis and/or an enzymatic hydrolysis followed by gc and gc-ms analyses. | 1993 | 7763947 |
| chemopreventive effect of green tea (camellia sinensis) among cigarette smokers. | chemopreventive effects of green tea and coffee among cigarette smokers were examined in 52 clinically healthy male subjects between 20 and 52 years of age. blood specimens were obtained from nonsmokers (group i), smokers (group ii), smokers consuming green tea (group iii), and smokers drinking coffee (group iv). the mean number of cigarette smoking years (> 10 cigarettes/day) in groups ii-iv ranged from 13.4 to 14.7 years. daily intake of green tea and coffee was 2-3 cups/day for 6 months (grou ... | 1995 | 7655335 |
| anti-hyperglycemic effect of black tea (camellia sinensis) in rat. | investigations were carried out to evaluate the effect of the hot water extract of black tea (camellia sinensis (l.) o. kuntze (theaceae) on streptozotocin (stz)-induced diabetes in rats. the extract significantly reduced the blood glucose level and was found to possess both preventive and curative effects on experimentally produced diabetes in rats. the study reveals that, like green tea, black tea also possesses antidiabetic activity. | 1995 | 7623488 |
| effect of tea (camellia sinensis l.) on lipid peroxidation in rat liver and kidney: a comparison of green and black tea feeding. | the antioxidant effects in the liver and kidney obtained from rat fed diets containing 3% green or black tea leaf powder, which were prepared from the same lot tea leaves, were studied using the tissue slice-antioxidant evaluation method with two lipid peroxidation inducers. after 50 d on the diets, liver slices prepared from green and black tea-supplemented rats showed significant inhibitory effects against tert-butyl hydroperoxide-induced lipid peroxidation. these effects, however, were not pr ... | 1995 | 7581239 |
| anti-ulcer effect of the hot water extract of black tea (camellia sinensis). | the effect of the hot water extract of black tea (camellia sinensis (l.) o. kuntze, theaceae) on ulceration induced by various ulcerogens and by cold restraint stress (crs) was investigated in albino rats. while prior administration of tea extract for 7 days significantly reduced the incidence of ulcer, ulcer number and ulcer index produced by aspirin, indomethacin, ethanol, reserpine and crs, it failed to inhibit the ulcers induced by serotonin and histamine. tea extract also favourably altered ... | 1995 | 7564415 |
| [molluscicidal activity of seed of camellia sinensis]. | this paper is a preliminary report on the molluscicidal activity of seed of camellia sinensis (l) o. kuntze (scs). its ld50 and ld90 were 10 and 16 micrograms/ml, respectively. we found also scs inhibited oxygen consumption 65% and glycogen content of oncomelania snail by 80%. the activity of hatching eggs to juvenile snails was inhibited by this seed at 8-16 micrograms/ml. juvenile snails may also be killed by this molluscicide. | 1995 | 7554158 |
| inhibition of n-nitrosomethylbenzylamine-induced esophageal tumorigenesis in rats by green and black tea. | in this study, we investigated the effects of green tea and black tea, when given either during or after carcinogen treatment, on esophageal tumorigenesis in male sprague-dawley rats. rats were treated with n-nitrosomethylbenzylamine (nmbza) (2.5 mg/kg, s.c., twice weekly) for 5 weeks; 39 weeks after the initial dose of nmbza, 65% of the rats had esophageal tumors with an average of 1.4 +/- 0.3 tumors per rat. in the groups of rats receiving 0.6% of decaffeinated green tea (dgt) or decaffeinated ... | 1995 | 7554067 |
| a study on tea aroma formation mechanism: alcoholic aroma precursor amounts and glycosidase activity in parts of the tea plant. | we have shown in molecular basis that alcoholic tea aroma is mainly formed by endogenous enzymatic hydrolysis of glycosidic aroma precursors during manufacturing. amounts of alcoholic aroma precursor and glycosidase activity in each part of the tea shoot (camellia sinensis var. sinensis cv yabukita and a hybrid of var. assamica & var. sinensis cv izumi) were indirectly measured by means of a crude enzyme assay. the aroma precursors were abundant in young leaves and decreased as the leaf aged. gl ... | 2016 | 7546039 |
| (s)-linalyl, 2-phenylethyl, and benzyl disaccharide glycosides isolated as aroma precursors from oolong tea leaves. | three glycosides, 6-o-beta-d-xylopyranosyl-beta-d-glucopyranosides (beta-primeverosides) of the aroma constituents, linalool, 2-phenylethanol, and benzyl alcohol, were isolated as aroma precursors from the tea leaves (camellia sinensis var. sinensis cv. shuixian and maoxie, cultivars for oolong tea). the isolation was guided by acid or enzymatic hydrolysis, and subsequent gc and gc-ms analyses. the linalyl glycoside is the first example of naturally occurring (s)-linalyl beta-primeveroside. | 1994 | 7522061 |
| antioxidative and antimutagenic effects of theaflavins from black tea. | theaflavins, polyphenolic ingredients of black tea, were observed to inhibit in vitro lipid peroxidation in the erythrocyte membrane ghost and microsomal systems. theaflavins also showed inhibition of dna single-strand cleavage and mutagenicity, both induced by hydrogen peroxide. these results suggest that theaflavins scavenge radicals to produce antioxidative and antimutagenic effects. it was also found that the gallic acid moiety of theaflavins is essential for their potent antioxidative activ ... | 1994 | 7508563 |
| unexplained severe illness possibly associated with consumption of kombucha tea--iowa, 1995. | kombucha tea is a popular health beverage made by incubating the kombucha mushroom in sweet black tea. although advocates of kombucha tea have attributed many therapeutic effects to the drink (1-3), its beneficial and/or adverse effects have not been determined scientifically. during april 1995, cases of unexplained severe illness (including one death) occurred in two persons in a rural town in northwestern iowa who had been drinking kombucha tea daily for approximately 2 months. based on the fi ... | 1995 | 7476846 |
| effect of feeding coffee and its lipids on regenerating and intact liver. | liver regeneration was stimulated in partially hepatectomized rats fed diets supplemental with up to 7.0% by weight of ground green and roasted brazilian or hawaiian (kona) coffee in a basal powdered ration but was little influenced by decaffeinated or african robusta coffee diets over a period of 10 days. the causative agent occurred in the total lipids from the active ground coffee batches and could be concentrated in the unsaponifiable portion as was also noted with the product from robusta c ... | 1980 | 7403660 |
| inhibition of passive cutaneous anaphylaxis by compounds of camellia sinensis. | 1981 | 7255570 | |
| prophylactic effect of tea on pathogenic micro-organism infection to human and animals. (1). growth inhibitive and bacteriocidal effect of tea on food poisoning and other pathogenic enterobacterium in vitro. | 0.5% tea powder of oolong tea, green tea and black tea, respectively added to tryptic soy agar (tsa) plates prepared non aseptically could inhibit the growth of colonies of st. aureus and airborne bacteria, but only very few fungi colonies. 0.5% tea powder of oolong tea, green tea and black tea, respectively added to tryptic soy agar (tsa) plates prepared non aseptically could also inhibit the colonial growth of v. cholerae, v. parahaemorrhagiae, sal. dysenteriae, sal. typhi, sal. paratyphi a an ... | 1980 | 7251263 |
| [effect of triterpene glycosides and polyene antibiotics on cell membrane permeability for k+ ions and uv-absorbing substances]. | the effect of triterpene glycosides (cauloside c from caulophyllum robustum, theasaponine from thea sinensis, cucumarioside g from cucumaria fraudatrix stichoposide a from stichopus japonicus s., holothurines a and b from holothuria mexicana, holothurine c from bohadschia sp.) on the membrane permeability for k+ ions and uv-absorbing substances was compared with that of polyene antibiotics, viz., amphotericine b and nystatine. as a biological model fertilized eggs of sea urchin strongylocentrotu ... | 1981 | 7198783 |
| prophylactic effect of tea on pathogenic microorganism infections to humans and animals. (ii). protozoacidal effect on toxoplasma gondii in vitro and mice. | the trophozoites of toxoplasma gondii strain (rh) obtained from the peritoneal exudate of infected mice were treated with tea in various concentrations of 0.5, 1, 3 and 5% for 0.5, 1 and 3 hours, respectively. after treatment, they were intraperitoneally inoculated into the mice to observe the protozoacidal effect of tea. the results obtained are as follows: 1) oolong tea and green tea had stronger protozoacidal effect than black tea. 2) the lowest and effective concentration of tea tested to ki ... | 1982 | 7169306 |
| mutagenicity of various japanese foodstuffs treated with nitrite. | mutagenic activities of various japanese foodstuffs treated with nitrite at ph 4.2 for 10 min (37 degrees c) were tested using salmonella typhimurium ta 100, ta 1535 and also a streptomycin(sm)-dependent strain of salmonella typhimurium ta 100. among 46 common food samples tested, smoked ham, red wines, black teas, soybean pastes and instant coffee powder gave greatly increased numbers of his+ revertants or sm-independent colonies when treated with nitrite. vegetables, soybean-seasonings and a v ... | 1982 | 7141563 |
| mutagenicity of hydrolysates of tea infusions. | hydrolysates of infusions of green tea and black tea were mutagenic by the ames test. the tea infusions were prepared by a regular method and were hydrolysed with 1 m hcl, hesperidinase, naringinase and human intestinal bacteria. the hydrolysates were successively extracted with chloroform, diethyl ether and ethyl acetate. the mutagenicities of the extracts were assayed by the ames test, and the mutagens were analysed by gc-ms. the ether extracts of the hydrolysates of infusions of both green te ... | 1981 | 7019686 |
| folacin content of tea. | total folacin and free folacin activities of 22 commercial tea samples, involving 5 types and 14 brands, were determined by a microbiological assay, using lactobacillus casei (atcc 7469). substantially higher amounts of folacin were found in tea leaves than had been reported previously, due to an improved assay method with added ascorbic acid to protect the labile folate forms. tea brews made from green and black teas contained approximately three to four times more folacin than the brews made f ... | 1983 | 6853937 |
| [renal fluoride secretion following the drinking of black tea]. | 1984 | 6730563 | |
| the influence of dietary tea, coffee and cocoa on protein and energy utilization of soya-bean meal and barley in rats. | two series of balance experiments were performed with growing rats to test the effect of black tea, green tea, coffee and cocoa on protein and energy utilization. in expt 1 soya-bean meal was fed as a basal diet and supplemented with freeze-dried materials from 11 black tea, green tea or coffee/500 g dry matter. cocoa powder, corresponding to 11 of the beverage, was also added to the basal diet. in expt 2 the procedure was repeated with a barley-based diet. in both experiments both tea varieties ... | 1983 | 6684477 |
| [fluorides--black tea--health]. | 1984 | 6523919 | |
| diphenylamine, an antihyperglycemic agent from onion and tea. | diphenylamine has been isolated as one of the active antihyperglycemic agents of onion. it was identified by ir, uv, cmr, pmr, and mass spectra. it attained the highest percentage in mature onion bulbs; other onion organs contained diphenylamine in lower percentages. green and black teas were found to contain relatively high percentages of diphenylamine, being higher in the former. cooking was found to decrease the diphenylamine content. | 1984 | 6512531 |
| natural antioxidants. i. antioxidative components of tea leaf (thea sinensis l.). | 1984 | 6467480 | |
| occurrence of vitamin e in black tea. | 1966 | 5978237 | |
| changes undergone by free amino-acids during the manufacture of black tea. | 1966 | 5930536 | |
| peptidase activity in shoot tips of the tea plant (camellia sinensis l.). | 1964 | 5839447 | |
| studies on the polyphenol metabolism of tissue cultures derived from the tea pant (camellia sinensis l.). | 1. the growth characteristics on various media of solid and liquid suspension cultures derived from the stem of the tea plant are described; chlorophyll and anthocyanin synthesis occurred in the light. 2. only the simplest catechins and leucoanthocyanins were present in callus tissue, although oligomeric and polymeric leucoanthocyanin fractions were also represented. light caused an increase in all monomeric components analysed, but inhibited polymerization of the leucoanthocyanins. 3. the polyp ... | 1969 | 5821008 |
| the separation and distribution of simple and condensed leucoanthocyanins of the tea plant (camellia sinensis l.). | 1. leucoanthocyanin monomers of high mobilities in aqueous solvents on thinlayer chromatograms, assumed to be structurally simple, were characteristic of mature bulky tissues, whereas members of lower mobility were confined to young vegetative and floral tissues. 2. flavylogens were separated by gel filtration on sephadex columns into monomeric, oligomeric and polymeric fractions. 3. the polymeric fraction from young brown stems was heterogeneous, one-half having a molecular weight of about 3400 ... | 1969 | 5821007 |
| the distribution of polyphenols in the tea plant (camellia sinensis l.). | 1. methods for the separation and determination of the polyphenolic components of the tea plant by thin-layer chromatography and colorimetric reactions have been devised. 2. high concentrations of catechins, flavonols and depsides were found to be restricted to the young vegetative and floral shoots, whereas leucoanthocyanins or flavylogens were characteristic of the more bulky axial tissues of the plant. 3. in the young shoots cell growth was correlated with an increasing degree of flavonoid b- ... | 1969 | 5821006 |
| [triterpenes. xxv. on the structure of "theasaponin", a mixture of saponins from thea sinensis l. exhibiting strong antiexudative properties]. | 1969 | 5800718 | |
| [on the pharmacology of tea-seed-saponins of a saponin mixture from thea sinensis l]. | 1968 | 5755916 | |
| metabolism of methylamine in the tea plant (thea sinensis l.). | 1. the metabolism of methylamine in excised shoot tips of tea was studied with micromolar amounts of [(14)c]methylamine. of the [(14)c]methylamine supplied 57% was utilized by tea shoots during the 10h experimental period. 2. the main products of [(14)c]methylamine metabolism in tea shoots were serine, gamma-glutamylmethylamide, theobromine, caffeine and co(2). there was also incorporation of the label into glutamate, aspartate, rna purine nucleotides and s-adenosylmethionine. 3. the formation o ... | 1973 | 4721610 |
| gas chromatographic-mass spectrometric analyses of "flavory" and "non-flavory" ceylon black tea aroma concentrates prepared by two different methods. | 1973 | 4708861 | |
| 5-dehydroshikimate reductase in the tea plant (camellia sinensis l.). properties and distribution. | 1. a method for the extraction of 5-dehydroshikimate reductase (ec 1.1.1.25) from tea plant tissues in an active soluble state has been developed. it is dependent on the use, in the extraction medium, of an insoluble polyphenol adsorbent (polyclar at), which prevents the polyphenols present from precipitating all the proteins. 2. the enzyme has the following properties: ph optima at ph10.1 in glycine-sodium hydroxide buffer and at ph7.7 in tris-hydrochloric acid buffer; k(m) (nadp) 32mum and k(m ... | 1966 | 4380104 |
| polar lipid composition of the leaves and seeds from the tea plant (camellia sinensis l). | 1974 | 4368006 | |
| an evaluation of preparatory procedures for leaf-tip chromosomes spreads of the tea plant (camellia sinensis). | 1968 | 4176665 | |
| detection and chemical identification of natural bio-antimutagens. a case of the green tea factor. | a bio-antimutagen, isolated from japanese green tea (leaves of camellia sinensis), reduced high spontaneous mutations due to altered dna-polymerase iii in a mutator strain of bacillus subtilis. chemical studies showed that the factor was epigallo-catechin-gallate (egcg). | 1985 | 3923334 |
| case-control study of urinary bladder cancer in metropolitan nagoya. | we conducted a population-based case-control study of patients with bladder cancer and of controls drawn randomly from the general population of metropolitan nagoya and interviewed both groups. the incidence rates of bladder cancer were 2.42 and 7.05/100,000 for females and males, respectively. the analysis, based on 293 patients and 589 controls who were frequency matched for age, sex, and residence, provided the following major findings. age-adjusted relative risks of 1.89 (1.15-3.10) and 3.53 ... | 1985 | 3834338 |
| black tea consumption and cancer risk: a prospective study. | in a prospective cohort study, men of japanese ancestry were clinically examined from 1965 to 1968. for 7,833 of these men, data on black tea consumption habits were recorded. since 1965, newly diagnosed cancer incidence cases have been identified: 152 colon, 151 lung, 149 prostate, 136 stomach, 76 rectum, 57 bladder, 30 pancreas, 25 liver, 12 kidney and 163 at other (miscellaneous) sites. compared to almost-never drinkers, men habitually drinking black tea more than once/day had an increased re ... | 1986 | 3778808 |
| mutagens in coffee and other beverages. | a cup of coffee contains mutagens which produce about 5 x 10(4)-10(5) revertants of salmonella typhimurium ta 100 without s9 mix. one of the mutagens was identified to be methylglyoxal. methylglyoxal was present in various beverages such as black tea, whisky, and brandy. methylglyoxal itself induced tumors in rats when administered by subcutaneous injection. however, the mutagenic properties of coffee were different from those of methylglyoxal. the mutagenicity of coffee was suppressed by catala ... | 1986 | 3757962 |
| pesticide residues in black tea. | an investigation of residues of organochlorine and organophosphorous pesticides, as well as of a number of fungicides and of inorganic bromide in 99 samples of black tea taken on the danish market is reported. the type of pesticide residues involved appear to be very uniform within each country of origin, whereas there are distinct differences between individual countries. tea from sri lanka seems to contain less and fewer residues than tea from the other big tea producing countries. a great man ... | 1986 | 3751325 |
| protein conversion efficiencies of four test diets based on milk, two milk and tea treatments, and casein. | milk consumption in 80 households in western kenya averaged .25 to 1.00 l per family per day. most of this milk was processed into a milk and tea beverage. polyphenols, the major determinants of tea flavor and character, form soluble complexes with casein when black tea infusions are mixed with milk. test diets were prepared from the following treatments: a) casein reference diet; b) milk, no tea leaves; c) milk added after heat treatment; and d) traditional kenyan-style tea (i.e., milk and tea ... | 1986 | 3722539 |
| [the structures of two new flavonoid glycosides from bai-shui-cha, a kind of camellia sinensis l]. | 1987 | 3661207 | |
| iron, copper and zinc metabolism of rats fed various levels and types of tea. | the effects of tea and components in tea on mineral metabolism were investigated in a series of studies. in studies a and b weanling rats were fed diets containing various levels (0, 0.35, 1.17 or 3.50%) of a commercially prepared instant tea and diets containing 0 or 1.17% catechin. in study c anemic rats were fed diets containing 0 or 2.31% desiccated green or black tea infusions for 23 d. in study d rats were fed a diet containing 2.31% desiccated black tea infusions for 16 d, were fed the te ... | 1988 | 3335939 |
| factors related to late menopause and early menarche as risk factors for breast cancer. | to investigate underlying factors of late menopause and early menarche which are regarded as risk factors for breast cancer, we analyzed the relationships between ages at menarche and menopause, and other environmental and physical factors using the data of a population-based survey conducted in aichi prefecture, japan. the analysis on menopause was based on 3,148 women aged 55 or more and the analysis on menarche was based on 16,392 women aged 40 or more. these subjects were grouped into three ... | 1988 | 3130350 |
| folklore therapeutic indigenous plants in periodontal disorders in india (review, experimental and clinical approach). | though a number of plants and their parts are used for dental ailments among population in rural and urban areas of developing countries, in india however, the most common house-hold, road-side plants are mango (mangifera indica), neem (azadirachta indica; melia azadirachta), ocimum (ocimum basilicum), tea-dust (camellia sinensis) and uncommonly murayya, i.e., currey leaf (murayya koenigi) [chopra et al. 1958, kirtikar and basu 1935, nadakarni 1954, satyavati 1984]. the leaves of these plants ar ... | 1988 | 3042642 |
| chromosome aberrations induced by aflatoxin b1 in rat bone marrow cells in vivo and their suppression by green tea. | aflatoxin b1 (afb1)-induced chromosome aberrations (ca) in rat bone marrow cells consisted mainly of gaps and breaks. cells with exchanges and multiple ca were observed infrequently. the incidence of aberrant cells and the number of aberrations per cell were at their maximum levels 18 h after the afb1 injection. they were dependent on the administered dose of afb1. rats given the hot water extract from green tea (gte) 24 h before they were injected with afb1 displayed considerably suppressed afb ... | 1989 | 2922009 |
| effect of consumption of green and black tea on the level of various enzymes in rats. | drinking of both green and black tea as the only liquid ingested resulted in significant decreases in the activity of transketolase in whole blood of rats both before and after the in vitro addition of thiamin diphosphate. liver transketolase activity was decreased only by green tea. mucosal transketolase activity was not affected by either type of tea. the activity of lactate dehydrogenase (ldh) was not affected by either type of tea, while whole blood ldh was decreased by both green and black ... | 1989 | 2912766 |
| characteristics of past smokers. | we studied characteristics of past smokers according to the duration of cessation of smoking based on data from a population-based survey. lifestyle, prevalences of various symptoms and diseases and other factors were compared among current smokers (8507 males and 2012 females), past smokers (4423 males and 684 females) and non-smokers (2431 males and 12,859 females) aged 40 years and over. compared to current smokers, past smokers consumed more bread, milk, vegetables, fruit and black tea, and ... | 1989 | 2788628 |
| crude tea extracts decrease the mutagenic activity of n-methyl-n'-nitro-n-nitrosoguanidine in vitro and in intragastric tract of rats. | the effects of tea extracts and their ingredients, catechins and l-ascorbic acid (asa), on the mutagenicity of n-methyl-n'-nitro-n-nitrosoguanidine (mnng) were examined in vitro and in the stomachs of rats using e. coli wp2 and s. typhimurium ta100. the extracts of green tea and black tea leaves decreased the mutagenic activity of mnng to e. coli wp2 in vitro in a desmutagenic manner. catechins such as (-)-epigallocatechin from green tea leaves and the low-molecular-weight tannin fraction isolat ... | 1989 | 2642597 |
| differential inhibition of hiv-reverse transcriptase and various dna and rna polymerases by some catechin derivatives. | the two components of camellia sinensis (green tea) (i.e., (-)-epigallocatechin gallate and (-)-epicatechin gallate were found to differentially inhibit the activities of reverse transcriptase and cellular dna and rna polymerases. the strongest inhibition by these compounds was observed with reverse transcriptase. dna polymerases alpha and beta were also strongly inhibited. the mode of the inhibition of reverse transcriptase and other dna polymerases was competitive with respect to the template. ... | 1989 | 2481838 |
| [effect of six edible plants on the development of afb1-induced gamma-glutamyltranspeptidase-positive hepatocyte foci in rats]. | six edible plants, green tea (gt), black tea (bt), lentinus edodes (berk) sing (le), hericium erinaceus (bull. ex fr.) pers. (he), mixture of ganoderma lucidum (ley ss ex fr.) karst et ganoderma japanium (fr.) lloyd (mglj) and mung bean (mb), were tested for the effect on the development of afb1-induced gamma-glutamyltranspeptidase positive hepatocyte foci (gamma-gt foci) using an in vivo short-term test model in rats. the rats received intraperitoneally 12 doses of initiator afb1, 400 microgram ... | 1987 | 2443327 |
| counter-current chromatography of black tea infusions. | counter-current chromatography using a multilayer coil planet centrifuge, with solvent system ethyl acetate-butanol-water, permits the separation of black tea infusions into fractions which include pure sii and a mixture of si and sia thearubigins. good resolution of several components of the infusion may be achieved in elution times of 1 to 2 h. the appearance of chromatograms is altered on decaffeinating the infusion. the effect of stationary phase composition is considered. resolution of the ... | 1990 | 2355066 |
| [the effect of a black tea extract on the tumor-like growth of the fungus fusarium bulbigenum var. blasticola]. | the antiblastogenic activity of black tea is predicted with a 98% credibility basing on the observation of its inhibitory or preventive effect on spontaneous or carcinogen-induced tumor development in the culture of mycelial fungus fusarium bulbigenum var. blasticola. | 1990 | 2316201 |
| [a case control study of cancer of the pancreas]. | we report the findings of a case-control study of cancer of the pancreas, which was conducted in hokkaido prefecture. seventy-one patients with pancreatic cancer were matched on sex and age (+/- 3 years) to 142 community-based controls. the latter had telephone interviews. we questioned all subjects about demographic factors, diet, beverage consumption, and medical and surgical history. significantly decreased risks were associated with consumption of raw vegetables and green tea. the risk incre ... | 1990 | 2313889 |
| [fluoride content of deciduous teeth after regular intake of black tea]. | continuous intake of black tea rich in fluorides leads to distinct increase of fluoride content of temporary teeth. this is to consider analogous a caries prophylaxis. | 1990 | 2268641 |
| effect of tea polyphenols on glucan synthesis by glucosyltransferase from streptococcus mutans. | in the course of our studies on the development of anti-plaque agents for prevention of dental caries, we investigated effects of some of tea preparations and their individual components on the glucan synthesis catalyzed by glucosyltransferase (gtf) from streptococcus mutans. extracts of green tea and black tea, and polyphenol mixtures showed appreciable inhibition in the synthesis of insoluble glucan. among the components isolated from tea infusions, theaflavin and its mono- and digallates had ... | 1990 | 2140716 |
| [anti-caries effects of polyphenol compound from camellia sinensis]. | polyphenol compound (designated sunphenon) from leaf of camellia sinensis have been partially purified by extraction of the boiling water with ethyl acetate. the effect of sunphenon on cariogenic streptococcus mutans groups (serotype c and g) was studied in both in vitro and in vivo. the summary of results were described as follows; 1) addition of sunphenon to s. mutans jc-2 (c) caused a decrease in cell viability. the activity of sunphenon showed that multiple application are required for killi ... | 1990 | 2135607 |
| the protective activity of tea against infection by vibrio cholerae o1. | extracts of black tea exhibited bactericidal activity against vibrio cholerae o1. the tea extract inhibited the haemolysin activity of v. cholerae o1, el tor and the morphological changes of chinese hamster ovary cells induced by cholera toxin. tea extract also reduced fluid accumulation induced by cholera toxin in sealed adult mice and by v. cholerae o1 in ligated intestinal loops of rabbits. these findings suggest that tea has protective activity against v. cholerae o1. | 1991 | 2019547 |
| inhibition of platelet activation and endothelial cell injury by flavan-3-ol and saikosaponin compounds. | the effects of flavan-3-ol and saikosaponin compounds on platelet aggregation, platelet thromboxane biosynthesis and h2o2-induced endothelial cell injury were studied. seven flavan-3-ol compounds isolated from camellia sinensis l. var sinensis o. kuntze (theaceae) and three saikosaponin compounds isolated from bupleurum falcatum l. (umbelliferae) were used. among the 10 compounds tested, only epigallocatechin and saikosaponin a significantly inhibited human platelet aggregation induced by adp, a ... | 1991 | 1946562 |
| mutagenicity and carcinogenicity of tea, camellia sinensis. | aqueous, caffeine free and tannin fractions of commercial tea and tannic acid were tested for mutagenicity in ames test. tea fractions of tannic acid were non mutagenic in strains ta 100, ta 98, ta 1535 and ta 1538 of salmonella typhimurium with or without metabolic activation (rat-s9 mix) at different doses tested. in strain ta 98 the above tea fractions and tannic acid inhibited the s9 mix mediated mutagenicity of tobacco in a dose dependent manner. the different tea fractions at 60 degrees c, ... | 1991 | 1916936 |
| tea tannin components modify the induction of sister-chromatid exchanges and chromosome aberrations in mutagen-treated cultured mammalian cells and mice. | the modifying effects of tannin components extracted from green tea and black tea on mutagen-induced sces and chromosome aberrations were studied. these tannin components did not affect spontaneous sces and chromosome aberrations in cultured chinese hamster cells. the frequency of sces and chromosome aberrations induced by mitomycin c (mmc) or uv was enhanced by the posttreatment with tea tannin components. when cells were post-treated with tea tannin components in the presence of metabolic enzy ... | 1991 | 1899132 |
| inhibitory effect of chinese tea on n-nitrosation in vitro and in vivo. | the inhibitory effect of 145 samples of chinese tea on the formation of n-nitrosomorpholine was studied in vitro. the rates of inhibition by green tea, crush, tear, curl (ctc) black tea, brick tea, jasmine tea, oolong tea, sun-dried tea and black tea were positively correlated with their polyphenol contents. an inhibitory effect of green and black tea on endogenous n-nitrosation was also confirmed in humans. drinking tea after a meal had a greater effect than drinking it before a meal. | 1991 | 1855915 |
| [quantitative analysis of (-)-epigallocatechin gallate in tea leaves by high-performance liquid chromatography]. | the quantitative analysis of (-)-epigallocatechin gallate (egcg) in tea (camellia sinensis l.) was performed by high-performance liquid chromatography (hplc) with a c-18 reversed-phase column. egcg was then eluted within 20 min by using methanol-water-acetic acid (20:75:5 (v/v/v)) as an eluent. as an internal standard, tryptophan was used. the content of egcg in five kinds of green tea (sencha, gyokuro, bancha, matsucha and oolong tea) and in a cup of those was determined by both the extraction ... | 1991 | 1806661 |
| niacin, thiamin, iron and protein status of humans as affected by the consumption of tea (camellia sinensis) infusions. | the objective of the project was to determine the effects of tea (camellia sinensis) leaf beverage consumption on the apparent utilization of niacin, thiamin, and protein in human subjects. during two randomly arranged experimental periods of 14 days each, 10 adult female human subjects were fed a constant (same foods each day), measured, laboratory-controlled diet. tea was fed during one period while no tea was allowed during the other period. a dehydrated black tea infusion product (instant te ... | 1991 | 1796091 |
| dietary nicotine: a source of urinary cotinine. | foods, principally from plants in the family solanaceae, and a number of teas were examined for the presence of nicotine. dietary nicotine would give rise to cotinine in urine and compromise estimates of exposure to tobacco smoke that depend on urinary cotinine. all foods were homogenized, extracted and analysed for nicotine and cotinine by gas chromatography with nitrogen-sensitive detection (gc) and/or gc/ms (mass spectrometry). weak acid and aqueous extracts of the teas were analysed in a sim ... | 1991 | 1765327 |
| differential inhibitory effects of some catechin derivatives on the activities of human immunodeficiency virus reverse transcriptase and cellular deoxyribonucleic and ribonucleic acid polymerases. | the two components of camellia sinensis (tea plant) [i.e., (-)-epicatechin gallate and (-)-epigallocatechin gallate] were found to differentially inhibit the activities of reverse transcriptase and cellular dna and rna polymerases. under the assay conditions optimized for each enzyme species, the strongest inhibition by these compounds was observed with reverse transcriptase. the concentrations of (-)-epicatechin gallate and (-)-epigallocatechin gallate required for 50% inhibition of the activit ... | 1990 | 1693287 |
| inhibition of rotavirus and enterovirus infections by tea extracts. | epigallocatechin gallate from green tea and theaflavin digallate from black tea inhibited infections of cultured rhesus monkey kidney ma 104 cells with rotaviruses and enteroviruses. their antiviral effects were maximally induced when directly added to virus, and their pre- and post-treatment of the cells produced much weak antiviral activity. antiviral activity of the extracts therefore seems to be attributable to interference with virus adsorption. | 1991 | 1668240 |
| the inhibitory effect of plant extracts on the collagenolytic activity and cytotoxicity of human gingival fibroblasts by porphyromonas gingivalis crude enzyme. | it is well known that plant extracts inhibit some enzymatic activities. the present study examined the inhibitory effects of natural plant extracts against the collagenolytic activity of porphyromonas gingivalis. the enzyme was isolated from a culture supernatant of p. gingivalis 381. the aqueous and 50% ethanolic extracts of ginkgo biloba, mosla chinensis, salvia officinalis, cinnamomum cassia, and a catechin extract of camellia sinensis exhibited strong inhibitory effects on collagenolytic act ... | 1991 | 1668071 |
| anticaries effects of polyphenolic compounds from japanese green tea. | the dental caries inhibiting effect of the extract from japanese green tea, one of the most popular drinks in japan, was studied both in vitro and in vivo. the crude tea polyphenolic compounds (designated sunphenon) from the leaf of camellia sinensis were found to effectively inhibit the attachment of streptococcus mutans strain jc-2 (serotype c) to saliva-coated hydroxyapatide discs. sunphenon was also inhibitory to water-insoluble glucan formation from sucrose by crude glucosyltransferase of s ... | 1991 | 1667297 |
| the effects of chinese tea on the occurrence of esophageal tumors induced by n-nitrosomethylbenzylamine in rats. | based on previous studies on the blocking effect of chinese tea in the formation of n-nitroso compounds in rats and humans, experiments were carried out to study the effects of chinese tea on the occurrence of esophageal tumors induced by n-nitrosomethylbenzylamine (nmbza) in rats. | 1992 | 1615000 |
| tea components: antimutagenic and anticarcinogenic effects. | tea from the camellia sinensis species of the theaceae family is one of the most ancient and, next to water, the most widely consumed beverage in the world. since tea contains several polyphenols and since several other naturally occurring dietary polyphenols have shown antimutagenic effects in bacteria and anticarcinogenic effects in animal bioassay systems, we studied whether polyphenols extracted from chinese green tea (gtp) also possess antimutagenic and anticarcinogenic effects. | 1992 | 1614996 |
| green tea composition, consumption, and polyphenol chemistry. | tea is grown in about 30 countries but is consumed worldwide, although at greatly varying levels. it is the most widely consumed beverage aside from water with a per capita worldwide consumption of approximately 0.12 liter per year. tea is manufactured in three basic forms. green tea is prepared in such a way as to preclude the oxidation of green leaf polyphenols. during black tea production oxidation is promoted so that most of these substances are oxidized. oolong tea is a partially oxidized p ... | 1992 | 1614995 |
| inhibition of n-nitrosodiethylamine- and 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone-induced tumorigenesis in a/j mice by green tea and black tea. | the effect of p.o. administration of tea on nitrosamine-induced carcinogenesis was investigated. female a/j mice were given n-nitrosodiethylamine (ndea) (10 mg/kg) p.o. once a week for 8 weeks and were killed 16 weeks after the last dose. more than 90% of the mice had forestomach and lung tumors. the animals had an average of 8.3 forestomach and 2.5 lung tumors/mouse. with 0.63 or 1.25% green tea infusion (12.5 g green tea leaves brewed with 1 liter of boiling water) as the sole source of drinki ... | 1992 | 1551122 |
| [microbial contamination of twenty drugs of plant origin]. | twenty drugs of plant origin were analysed in order to determine the microbial contamination level. a light homogenizing method was used to avoid an increase in the antimicrobial capacity of certain drugs, which would falsify the analytical results. the total viable aerobic count (tvc) varied from 10(1) to 10(7) cfu/g and in 11 samples out of 21 was equal to or higher than 10(5) cfu/g. the number of fungi varied from one drug to another, but was generally lower than the aerobic tvc to the power ... | 1992 | 1438458 |
| a multi-institute case-control study on the risk factors of developing pancreatic cancer. | a multi-institute, hospital-based, case-control study on pancreatic cancer was carried out to examine its association with preceding diseases, cigarette smoking, alcohol drinking and dietary factors. analyses were based on 124 newly diagnosed exocrine pancreatic cancer cases and sex-, age- and institute-matched hospital controls in seven hospitals in japan. cigarette smoking showed a positive association with the risk of developing pancreatic cancer. especially among smokers, a risk enhancing ef ... | 1992 | 1434027 |
| antioxidative effect of polyphenol extract prepared from various chinese teas. | methods. twelve different types of chinese teas, including green, semifermented, and black tea, were studied for their antioxidant activities and active components. compositions of (-)-epicatechin, (-)-epigallocatechin, (-)-epicatechin gallate, (-)-epigallocatechin gallate, and gallic acid were identified by fast atom bombardment-mass spectrometry and high-performance liquid chromatography-mass spectrometry and quantified by high-performance liquid chromatography. antioxidant activities in lard ... | 1992 | 1409493 |