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. 2014 Jun 12;19(6):7990–8010. doi: 10.3390/molecules19067990

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© 2014 by the authors.

licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Standard curve (A) of the reaction of catechin with vanillin in glacial acetic acid and sample curves (B) of the reaction of CT fractions with vanillin in glacial acetic acid. The standard deviations (SD) for catechin (A) and samples (B) in the vanillin assay were below 0.02.