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On-line identification of unstable catalpol derivatives from Jamesbrittenia fodina by LC-MS and LC-NMR

Cogne, A.-L.
Queiroz, Emerson Ferreira
Marston, Andrew
Mavi, S.
Published in Phytochemical Analysis. 2003, vol. 14, no. 2, p. 67 - 73
Abstract LC-UV-MS analysis of the methanol extract of Jamesbrittenia fodina O. M. Hilliard (Scrophulariaceae) revealed the presence of cinnamic ester derivatives. Two isomeric pairs of these constituents were detected, but could not be isolated. In order to identify these unstable compounds, LC-H-1-NMR spectra were obtained for each individual isomer and standard NMR measurements were performed in-mixture. The spectra clearly demonstrated that the fractions consisted of mixtures of cis and trans cinnamoyl catalpol glycoside esters.
Keywords lc-nmrlc-mscatalpol derivativecis/trans cinnamoyl isomersjamesbrittenia fodinascrophulariaceaepremna-japonica leaves
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