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. 2021 Mar 10;8:647354. doi: 10.3389/fnut.2021.647354

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Copyright © 2021 Peng, Lu, Liu, Jiang and Chen.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The liquid chromatogram of mixed standard sample (A) and the relative percentage of free phenolic acids (B) and bound phenolic acids (C). Peaks identification: (1) gallic acid; (2) p-hydroxybenzoic acid; (3) caffeic acid; (4) epicatechin; (5) p-coumarinic acid; (6) ferulic acid; (7) rutint. Raw, raw pumpkin seed.