Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1112, Issue 1-2, Pages 263-268Publisher
ELSEVIER
DOI: 10.1016/j.chroma.2006.01.060
Keywords
LC-APPI-MS; LC-ESI-MS; stilbene; viniferin; downy mildew; grapevine; Vitis vinifera
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Resveratrol, trans-epsilon-viniferin and trans-delta-viniferin are the major stilbenes induced in downy mildew infected grapevine leaves. In addition, nine minor polyphenolic compounds, described as stilbenes derivatives, have been separated and detected among known stilbenes after a methanolic microextraction of small pieces (1-2 mg) from infected grapevine leaves with a rapid, qualitative and optimized HPLC method coupled to mass spectrometry using atmospheric pressure photoionisation (APPI-MS). The characterization of unknown stilbenic derivatives as six resveratrol dimers, two dimethylated resveratrol dimers and a resveratrol trimer are reported. Therefore, structures have been proposed for the dimethylated resveratrol dimers. Use of an easy sample treatment and the LC-APPI-MS method results in spectral data of these minor naturally occurring viniferin analogues. (c) 2006 Elsevier B.V. All rights reserved.
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