N-Hydroxylated polyamine derivatives were found to decompose during the ionization process of liquid chromatography-atmospheric pressure chemical ionization-mass spectrometry (LC-APCI-MS) experiments. The phenomenon was studied with a model compound, a synthetic N-hydroxylated tetraamine derivative. It was found that reduction, oxidation and water elimination occurred during APCI to generate the corresponding amine, N-oxide, and imine. The investigation further revealed that decomposition of hydroxylamines during APCI depends upon the concentration of the analyte and on the acidity of the solution introduced into the ionization source. The pH-dependence of decomposition was utilized for the development of an MS method that allows for the unambiguous identification of NOH functionalities. This method was applied for the study of natural products including polyamine toxins from the venom of the spider Agelenopsis aperta and mayfoline, a cyclic polyamine derivative of the shrub Maytenus buxifolia. Copyright © 2009 John Wiley & Sons, Ltd.
在
液相色谱-常压
化学电离-质谱(LC-APCI-MS)实验的电离过程中,发现N-羟基
多胺衍
生物会分解。研究人员使用一种模型化合物(一种人工合成的N-羟基四胺衍
生物)对这一现象进行了研究。结果发现,在APCI过程中会发生还原、氧化和
水消除反应,生成相应的胺、N-氧化物和
亚胺。研究进一步表明,APCI过程中
羟胺的分解取决于分析物的浓度和引入电离源的溶液的酸度。研究人员利用分解对pH值的依赖性开发了一种质谱方法,能够明确识别NOH的功能。该方法被用于研究
天然产物,包括蜘蛛Agelenopsis aperta毒液中的
多胺毒素和灌木Maytenus buxifolia的环状
多胺衍
生物mayfoline。版权所有 © 2009 John Wiley & Sons, Ltd.