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利用FAB MS和ESI MS等不同离子化方法的质谱 质谱 (MS/MS)联用技术 ,详细研究了紫杉醇的正负离子和具有 6 / 8/ 6型骨架的紫杉烷类二萜化合物的裂解特征、取代基种类对质谱裂解的影响 ,以及裂解方式与结构之间的相关性等问题 .探讨了 [M +H]+,[M +Na]+和[M H]-不同 (准 )分子离子的裂解规律 ,并对有关特征离子产生的途径进行了比较详细的研究 .还发现这类化合物中 1 3位侧链的丢失与失去乙酸的裂解表现出一定的竞争性 .另外 ,通过对高低不同能量碰撞得到的CID谱的比较和分析 ,认为对小分子的结构解析或者进行药物代谢产物的结构确定时 ,采用低能量碰撞的CID MS/MS谱比较合适 .研究结果表明 ,MS/MS谱比一般的质谱能更有效地反映出相关化合物之间在结构上存在的微小差异和结构特征 ,并为这类化合物的结构解析提供有益的分析依据 .
The cleavage characteristics of taxane-type diterpene compounds with positive and negative ions of paclitaxel and taxanes with 6/8/6 type of skeleton were studied in detail by mass spectrometry (MS / MS) combined with different ionization methods such as FAB MS and ESI MS. , The influence of substituent types on mass spectrometry cleavage, the correlation between the cleavage mode and the structure, etc. The effects of [M + H] +, [M + Na] + and [MH] Cleavage law, and the pathways of the characteristic ions were studied in detail.It was also found that the loss of 1 3 side chain of these compounds showed a certain degree of competition with the loss of acetic acid.Furthermore, The comparison and analysis of the CID spectra obtained by collision show that the CID MS / MS spectra with low-energy collisions are suitable for the structural elucidation of small molecules or the structure determination of drug metabolites.The results show that the MS / Mass spectrometry can more effectively reflect the slight differences in the structures of the related compounds and the structural features of the compounds, and provide a useful analytical basis for the structural analysis of such compounds.