Fluorescence, Absorption, Chromatography and Structural Transformation of Chelerythrine and Ethoxychelerythrine in Protic Solvents: A Comparative Study
作者:Jinjin Cao、Yanhui Zheng、Ting Liu、Jiamiao Liu、Jinze Liu、Jing Wang、Qirui Sun、Wenhong Li、Yongju Wei
DOI:10.3390/molecules27154693
日期:——
reference substances for quality control of Chinese herbal medicines, and ECH is the dihydrogen derivative of CH. In this study, their fluorescence and absorption spectra, as well as their structural changes in different protic solvents were compared. It was observed that their emission fluorescence spectra in methanol were almost the same (both emitted at 400 nm), which may be attributed to the nucleophilic
白屈菜红碱(CH)和乙氧基白屈菜红碱(ECH)是中草药质量控制的化学对照品,ECH是CH的二氢衍生物。在这项研究中,比较了它们的荧光和吸收光谱,以及它们在不同质子溶剂中的结构变化。观察到它们在甲醇中的发射荧光光谱几乎相同(均在 400 nm 处发射),这可能是由于 CH 和 ECH 与甲醇分子发生亲核和交换反应,共同生成 6-甲氧基-5, 6-二氢白屈菜红碱 (MCH)。加水稀释后,MCH转化为CH,主要以带正电荷的CH +形式存在在酸性和近中性条件下,荧光发射波长为 550 nm。随着水溶液pH值的升高,CH +转化为6-羟基-5,6-二氢白屈菜红碱(CHOH),在410 nm处发出荧光。MCH和CHOH的荧光量子产率分别为0.13和0.15,两者的荧光强度都远强于CH +。得出CH和ECH在同一质子溶剂中可以相互替代的结论,并通过高效液相色谱进一步验证。本研究将有助于对苯并菲啶类生物碱