Rapid and Easy Identification of Isomers of Coumaroyl- and Caffeoyl-D-quinic Acid by Gas Chromatography/Mass Spectrometry
作者:Claus Fuchs、Gerhard Spiteller
DOI:10.1002/(sici)1096-9888(199606)31:6<602::aid-jms338>3.0.co;2-9
日期:1996.6
The 3-O-, 4-O- and 5-O-isomers of caffeoyl-D-quinic acid and the corresponding ethyl esters were separated by high-performance liquid chromatography and the structures were verified by NMR spectrometry. Trimethylsilylation of the compounds allowed a rapid and easy identification of isomers from the proportions of the characteristic keg ions at m/z 345 and 307, Coamaroyl-D-quinic acids show analogous fragmentation for ions at mit 345 and 219, Stereochemical considerations explain the fragmentation of the isomers.