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Use of gallic acid (GA) as a standard in the Folin-Ciocalteu assay leads to an underestimation of phenol content in persimmon extracts so does the widely used catechin (C) in vanillin assay for determining condensed tannins in persimmon extracts. To develop suitable standards for addressing the issue of accuracy, we prepared highly purified persimmon tannin (PT) and its three fractions (PT20, PT40...
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