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

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Authors

SCHRAM Karl MIKETOVA Petra SLANINA Jiří HUMPA Otakar TÁBORSKÁ Eva

Year of publication 2004
Type Article in Periodical
Magazine / Source Journal of Mass Spectrometry
MU Faculty or unit

Faculty of Medicine

Citation
Web http://www3.interscience.wiley.com/cgi-bin/fulltext/107632630/PDFSTART
Field Organic chemistry
Keywords tandem mass spectrometry; natural products; dicaffeoylquinic acids; electrospray ionization
Description 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.
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