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. 2020 Sep 26;10(10):383. doi: 10.3390/metabo10100383

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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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Superimposed chromatograms at 320 nm (solid line) and 280 nm (dotted line) of mature Coffea arabica leaves. Separation was carried out on a Agilent Eclipse XDB C18 column with methanol and 2% acetic acid in water as eluents. 1: theobromine; 2, 3-CQA; 3, (+)-catechin; 4, 5-CQA; 5, 4-CQA; 6, caffeine; 7, (-)-epicatechin; 8, mangiferin; 9, FQA; 10, flavone-di-C-hexose (F-dihex); 11, quercetin-dihexose-deoxyhexose (Q-dihex-dhex); 12, quercetin-diglucoside (Q-diglu); 13, kaempferol-dihexose-deoxyhexose (K-dihex-dhex); 14, kaempferol-hexose-deoxyhexose; 15, 3,4-diCQA; 16, 3,5-diCQA; 17, quercetin-rutinoside (rutin); 18, 4,5-diCQA.