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
analysis of trace metals and perfluorinated compounds in 43 representative tea products from south china.six trace metals (cd, pb, cr, cu, zn, and mn) and 2 perfluorinated compounds (pfcs), perfluorooctane sulfonate (pfos) and perfluorooctanoic acid (pfoa), were analyzed in 43 representative tea products (including 18 green, 12 oolong, and 13 black teas) from 7 main tea production provinces in china, using the atomic absorption spectrophotometer for trace metals analysis and hplc-ms/ms for pfos and pfoa analysis. the average contents of the 3 essential metals mn, cu, and zn ions in the tea samples ...201424806350
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