Publications

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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 ...19827169306
tea and cancer prevention: an evaluation of the epidemiologic literature.animal and in vitro studies provide evidence of an anticarcinogenic potential of active ingredients in teas. this review encompasses epidemiologic studies of stomach, colon, and lung cancer as well as the evidence of a relationship between tea drinking and cancer at large in humans. cohort studies do not suggest a protective role for tea drinking in the total risk of cancer. site-specific studies reveal a more complex picture. the epidemiologic studies on tea drinking and stomach cancer do not j ...19978970175
novel antiallergic catechin derivatives isolated from oolong tea.two catechin derivatives (c-1 and c-2) with potent antiallergic activity were isolated from taiwanese oolong tea by hplc techniques. from nmr and fab-ms analyses, the structures of c-1 and c-2 were elucidated as (-)-epigallocatechin 3-o-(3-o-methyl)gallate and (-)-epigallocatechin 3-o-(4-o-methyl)gallate, respectively. the oolong tea leaves contained 0.34% (dry weight) c-1 and 0.20% c-2. traces of c-2 were detected in only 1 of 15 varieties of green tea tested. c-1 was detected in 13 of 15 green ...199910552469
hplc analysis of naturally occurring methylated catechins, 3' '- and 4' '-methyl-epigallocatechin gallate, in various fresh tea leaves and commercial teas and their potent inhibitory effects on inducible nitric oxide synthase in macrophages.(-)-epigallocatechin-3-gallate (egcg), a major polyphenol of green tea, undergoes substantial biotransformation to species that includes the methylated compounds. recent studies have demonstrated that the methylated egcg has many biological activities. in this study, we have investigated the composition of the three o-methylated egcg derivatives, (-)-epigallocatechin-3-o-(3-o-methyl)gallate (3' '-me-egcg), (-)-epigallocatechin-3-o-(4-o-methyl)gallate (4' '-me-egcg) and (-)-4'-methyl epigallocate ...200516131108
chemical profiling and gene expression profiling during the manufacturing process of taiwan oolong tea "oriental beauty".oriental beauty, which is made from tea leaves infested by the tea green leafhopper (jacobiasca formosana) in taiwan, has a unique aroma like ripe fruits and honey. to determine what occurs in the tea leaves during the oolong tea manufacturing process, the gene expression profiles and the chemical profiles were investigated. tea samples were prepared from camellia sinensis var. sinensis cv. chin-shin dah-pang while the tea leaves were attacked by the insect. the main volatile compounds, such as ...200717587678
potential exposure and risk of fluoride intakes from tea drinks produced in taiwan.tea is the second most commonly consumed drink in the world. excess fluoride intakes from tea drinks may cause health effects. this work assesses infusible fluoride levels in popular tea sold in taiwan and evaluates potential exposure factors. lungjing, pouchong, tienguanyin, oolong, pureh, and black tea specimens were purchased from different counties in taiwan. fluoride levels were evaluated in one complete cycle of tea making as well as at different calcium carbonate contents in water, with g ...200817410113
a population-based, case-control study of green tea consumption and leukemia risk in southwestern taiwan.this study investigated the association between green tea consumption and leukemia.200918752033
antioxidant activity of some plant extracts towards xanthine oxidase, lipoxygenase and tyrosinase.natural products have the potential to be developed into new drugs for the treatment of various diseases. the aim of the present study was to screen the antioxidant activities of some common edible fruits, garden plants and medicinal plants indigenous to taiwan. this was performed by assessing the activities of lipoxygenase, xanthine oxidase and tyrosinase following incubation with extracts from these plants. a further aim was to use hplc-dad and tyrosinase to chromatographically identify the an ...200919701137
screen and genetic assessment of tea germplasms with elevated methylated catechin, (-)-epigallocatechin-3-o-(3-o-methyl)gallate.the aim of this research was to identify tea varieties containing high levels of catechin methyl ester that could be used as important sources for genetic breeding and in the production of high quality tea. we examined 113 species that have been preserved in the taitung branch of the tea research and extension station of taiwan (ttes). the average level of (-)-epigallocatechin-3-o-(3-o-methyl) gallate (egcg3''me) was 0.45% for all varieties screened. among them, 16 varieties with higher egcg3''m ...200919761185
quantitative analysis of acylated oleanane-type triterpene saponins, chakasaponins i-iii and floratheasaponins a-f, in the flower buds of camellia sinensis from different regional origins.a quantitative analytical method was developed for the determination of acylated oleanane-type triterpene saponins, chakasaponins i-iii (1-3) and floratheasaponins a-f (4-9), found in camellia sinensis (theaceae). the practical conditions for separation and detection of these saponins were established on an ods column with methanol containing 5 mm trifluoroacetic acid as a mobile phase, and the detection and quantitation limits of the method were estimated to be 1.1-3.8 and 3.5-12.5 ng, respecti ...201222307219
quantitative analysis of catechin, flavonoid, and saponin constituents in "tea flower", the flower buds of camellia sinensis, from different regions in taiwan.using the recently developed two analytical protocols, distributions were analyzed of five catechins (1-5), ten flavonoids (6-15), caffeine (16), and nine saponins (17-25) in 12 samples of flower buds of camellia sinensis (l.) o. kuntze, collected at different points in taiwan. characteristic tendencies with respect to the distribution of these constituents were observed according to the region of collection. among the catechins, (-)-epigallocatechin 3-o-gallate (5) was the major constituent in ...201324427940
cross-sectional and longitudinal associations of lifestyle factors with depressive symptoms in ≥ 53-year old taiwanese - results of an 8-year cohort study.the objective of this study is to determine the concurrent and longitudinal associations of lifestyle factors including smoking, alcohol drinking, betel quid chewing, tea (camellia sinensis) drinking and physical activity with depressive symptoms in older taiwanese.201323651861
dna barcode and identification of the varieties and provenances of taiwan's domestic and imported made teas using ribosomal internal transcribed spacer 2 sequences.the major aim of made tea identification is to identify the variety and provenance of the tea plant. the present experiment used 113 tea plants [camellia sinensis (l.) o. kuntze] housed at the tea research and extension substation, from which 113 internal transcribed spacer 2 (its2) fragments, 104 trnl intron, and 98 trnl-trnf intergenic sequence region dna sequences were successfully sequenced. the similarity of the its2 nucleotide sequences between tea plants housed at the tea research and ext ...201728911667
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