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- W2068303670 abstract "HPLC–UV–MS analysis of the methanol extract of Jamesbrittenia fodina (Wild) O. M. Hilliard (Scrophulariaceae) revealed the presence of different iridoid cinnamic esters; however, isolation of these constituents was prevented by instability problems. HPLC–UV–MS and HPLC–NMR analysis of the mixtures obtained after a tentative isolation indicated that, in the first instance, instability was due to a light-induced cis/trans isomerisation of the cinnamic moieties. Further investigation of related compounds showed an additional instability problem linked to other chemical transformations. A detailed HPLC–NMR–MS study of these fractions demonstrated that the modifications occurred on the rhamnose moiety of these iridoids. It could be concluded that the second type of instability was attributable to transesterification of the cinnamic moiety on the rhamnose unit. The recording of stop-flow HPLC–NMR spectra for specific HPLC peaks permitted the direct monitoring of these transformations. Based on these on-line data, six new unstable aucubin derivatives were efficiently characterised. Copyright © 2005 John Wiley & Sons, Ltd." @default.
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- W2068303670 date "2005-01-01" @default.
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- W2068303670 title "On-line identification of unstable iridoids fromJamesbrittenia fodina by HPLC-MS and HPLC-NMR" @default.
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- W2068303670 doi "https://doi.org/10.1002/pca.866" @default.
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