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. 2019 May 8;24(9):1787. doi: 10.3390/molecules24091787

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© 2019 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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(A) Representative extraction ion chromatograms of the samples with IS and chromatograms of samples with IS determined at different wavelengths of (B) 254, (C) 327, and (D) 340 nm. The mixed reference standards of (1) 3,4-dihydroxybenzoic acid, (2) 5-O-caffeoylquinic acid, (3) 3-O-caffeoylquinic acid, (4) caffeic acid, (5) 4-O-caffeoylquinic acid, (6) IS (chloramphenicol), (7) 3,5-O-di-caffeoylquinic acid, (8) luteoloside, (10) rutin, (9) 3,4-O-di-caffeoylquinic acid, and (11) 4,5-O-di-caffeoylquinic acid.