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fluoride and aluminium concentrations of tea plants and tea products from sichuan province, pr china.some tibetans in sichuan province in southwestern china have been suffering from fluorosis, due to drinking and eating tea with high fluoride (f) and aluminium (al) contents. tea plants, soils of tea plantations and tea products from yaan, gaoxian and yibin cities in sichuan province were investigated to evaluate the factors affecting f and al contents in tea products. the f and al concentrations of four commercial brands of brick teas were significantly higher than those of 11 brands of green t ...200312867178
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
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