Separation of tea polyphenols on paper chromatograms

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Abstract
With water as the mobile solvent in the paper chromatography a separation of the optical antipodes of catechin, epicatechin, gallocatechin and epigallocatechin appears to be achieved. It is provisionally concluded that (+)-catechin and (+)-gallocatechin occur naturally in the tea leaf, and that isolation of the corresponding ([plus or minus]) compounds is due to partial epimerizations of (-)-epicatechin and (-)-epigallocatechin during extraction. Gallocatechin-a gallate is provisionally identified as (-)-gallocatechin gallate, originating from (-)-epigallocatechin gallate by epimerization. Chlorogenic acid occurs in tea leaf. Aglycones of flavonols have zero RF in water, and may thus be distinguished from their glycosides.

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