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Mass spectrometry of 1,3- and 1,5-dicaffeoylquinic acids

✍ Scribed by Karl Schram; Petra Miketova; Jiri Slanina; Otakar Humpa; Eva Taborska

Publisher
John Wiley and Sons
Year
2004
Tongue
English
Weight
214 KB
Volume
39
Category
Article
ISSN
1076-5174

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✦ Synopsis

Abstract

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 Β© 2004 John Wiley & Sons, Ltd.

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