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- W2077251520 abstract "Abstract A method for separating and estimating the flavanols of tea by temperature-programmed gas—liquid chromatography of their trimethylsilyl derivatives is described. Columns of 3% OV-1 in 100–120 mesh Diatomite CQ give optimum separation, and used with a quercetin internal standard, give results reproducible to within ± 5%. Both black and green tea contain a species (thought to be 3-galloylquinic acid) interfering with the estimation of epigallocatechin: this difficulty is avoided by selective extraction of the flavanols into ethyl acetate. Conditions necessary for complete derivatisation are discussed, and a method is described for preparation of samples from unfired leaf." @default.
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- W2077251520 date "1971-01-01" @default.
- W2077251520 modified "2023-09-27" @default.
- W2077251520 title "The estimation of flavanols in tea by hare Gas chromatography of their trimethylsilyl derivatives" @default.
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- W2077251520 doi "https://doi.org/10.1016/0021-9673(71)80004-3" @default.
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