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
heterozygosities and genetic relationship of tea cultivars revealed by simple sequence repeat markers and implications for breeding and genetic mapping programs.genetic maps are essential tools for quantitative trait locus analysis and marker-assisted selection breeding. in order to select parents that are highly heterozygous for genetic mapping, the heterozygosity (hs) of 24 tea cultivars (camellia sinensis) was analyzed with 72 simple sequence repeat markers. in total, 359 alleles were obtained with an average of 4.99 per marker. the hs varied greatly from 37.5 to 71.0% with an average of 51.3%. on average, tea cultivars from fujian province showed a ...201525867299
variations of main quality components of tea genetic resources [camellia sinensis (l.) o. kuntze] preserved in the china national germplasm tea repository.the variations of the main quality components of tea, tea polyphenols, catechins, amino acids, caffeine, and water extract of 596 accessions chinese tea genetic resources, preserved in the china national germplasm tea repository (cngtr), were analyzed. tea polyphenols content on a dry weight basis varied from 13.6 to 47.8%, averaging 28.4%. the tea polyphenols content increases gradually from northern and eastern provinces to southern provinces, the highest is in yunnan tea resources. the conten ...200515898357
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
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