科研之友
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摘要
This experiment was carried out to study the influence of sample processing on the quantitative changes of the main coumarin derivative in the leaves of Matricaria chamomilla - herniarin and its glucosidic precursors [(Z)- and (E)-2-beta-D-glucopyranosyloxy-4-methoxycinnamic acids (GMCAs)]. Fresh and air-dried, as well as heat-dried samples (80, 100 and 120 degrees C), from four week-old plants were analysed. The content of Z-GMCA was the lowest in fresh samples while the content of herniarin was the highest in fresh samples. E-GMCA was not affected by sample processing. The E/Z-GMCA ratio decreased from fresh to heat-dried samples. The ratio of herniarin/Z-GMCA displayed the same trend. Probable mechanisms of these changes are also considered. The sum of GMCAs and herniarin, calculated as mu mol g(-1) DW, did not change significantly among all tested variants, to support our assumption that herniarin is not a volatile coumarin derivative.
- 出版日期2008-12-1
