目的研究草乌花煎煮过程中脂类生物碱的变化。方法利用电喷雾离子阱质谱分析,比较草乌花乙醇提取液、草乌花单煎液和草乌花煎煮后残渣中的生物碱。结果在草乌花单煎液中易溶于水的别那宁质量分数显著提高,未检测到脂肪酸酯型生物碱,三酯型脂类生物碱成为煎煮过草乌花中的主要生物碱。结论在草乌花煎煮过程中,双酯型和三酯型乌头生物碱除发生水解反应外,还发生酯交换反应生成双酯型和三酯型脂类生物碱。三酯型乌头生物碱的C8位乙酰基被各种长链脂肪酰基取代的酯交换反应为首次报道。

Objective To study how and why the lipo-alkaloids changed in decocting the flowers of Aconitum kusnezoffii (FAK). [WT5HZ]Methods The alkaloids in ethanol extract of FAK, FAK decoction, and the residues of decocted FAK were analyzed and compared by electrospray ionization tandem mass spectrometry (ESI-MSn). Results No lipo-alkaloids were detected in FAK decoction, however, triester-lipo-alkaloids become the dominant components in the residues of FAK decoction. Conclusion Besides hydrolysis reactions, ester-exchange reactions happen for diester-aconitines and triester-aconitines in the decocting of FAK. It is the first time to report that C₈-acetyl is displaced by long chain fatty acyl for triester-aconitines in the ester-exchange reactions.

深圳市科技计划资助项目(200528)