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. 2021 Jul 5;10(7):1375. doi: 10.3390/plants10071375

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© 2021 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 (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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HPLC chromatograms of phenolic acids showed in the red NAE (A), the white NAE (B), the red NEE (C), and the white NEE (D) from Column, Purospher^® Star PR-18; mobile phase, 0.1% formic acid in water and CAN; flow rate, 0.8 mL/min; detection wavelength, 250 nm. Flavonoids presented in the red NAE (E), the white NAE (F), the red NEE (G) and the white NEE (H); detection wavelength, 330 nm. Peak identification: peak 1, quercetin; peak 2, gallic acid; peak 3, catechin; peak 4, p-hydroxybenzoic acid.