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Mass spectrometry of 1,3‐ and 1,5‐dicaffeoylquinic acids
Author(s) -
Schram Karl,
Miketova Petra,
Slanina Jiri,
Humpa Otakar,
Taborska Eva
Publication year - 2004
Publication title -
journal of mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 1076-5174
DOI - 10.1002/jms.600
Subject(s) - chemistry , mass spectrometry , electrospray ionization , mass spectrum , tandem mass spectrometry , caffeic acid , ion , chromatography , analytical chemistry (journal) , organic chemistry , antioxidant
Samples of 1,3‐ ( 1 ) and 1,5‐dicaffeoylquinic acid ( 2 ) and their hexaacetate derivatives were examined using positive and negative electrospray ionization mass spectrometry and tandem mass spectrometry. Differences in the various spectra allow the discrimination of each of the isomers. Specific losses in the spectra of 2 also permit the identification of the site of substitution of one of the caffeic acid moieties as being at the 5‐position. The spectra of 3,5‐ ( 3 ) and 4,5‐dicaffeoylquinic ( 4 ) acids and their hexaacetate derivatives were compared with those of 1 and 2 and their derivatives, and differences in ion abundances or the presence/absence of specific ions can be used to identify uniquely each of the compounds. Copyright © 2004 John Wiley & Sons, Ltd.