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. 2020 Jan 15;21(2):564. doi: 10.3390/ijms21020564

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© 2020 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 (http://creativecommons.org/licenses/by/4.0/).

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TIC diagrams of nine flavonoid standards in the positive and negative ion mode. (A) the positive ion mode; A1 represents the chromatograms of narcissin (retention time = 3.51 min); A2 is the ones of isorhamnetin-3-O-beta-d-glucoside (retention time = 3.53 min); A3 is the ones of nobiletin (retention time = 4.56 min); A4 is the ones of tangeretin (retention time = 4.67 min); (B) the negative ion mode; B1 represents the chromatograms of quercetin-7-O-glucoside (retention time = 3.43 min); B2 is the ones of rutin (retention time = 3.44 min); B3 is the ones of kaempferol-3-O-glucoside (retention time = 3.50 min); B4 is the ones of quercetin (retention time = 3.69 min); B5 is the ones of isorhamnetin (retention time = 3.84 min).