Study on fragmentation behavior of taxoids by tandem mass spectrometry |
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Authors: | Abliz Zeper Qicheng Fang Xiaoting Liang Mitsuo Takayama |
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Affiliation: | (1) Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, 100050 Beijing, China;(2) Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Chiba 274 Funabashi, Japan |
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Abstract: | We have studied the fragmentation behavior of positive and negative ions of taxol and 6/8/6 type taxoids, the influence of different substituents on fragmentation, and the correlativity between fragmentation patterns and structure by MS/MS technique with different ionization methods such as FAB-MS, ESI-MS, etc. We have also investigated in detail the fragmentation of various molecular-related ions, such as [M+H]+, [M+Na]+ and [M-H]− ions, and the formation pathways of characteristic fragment ions. It has been found that there exists some competing reaction between the loss of C-13 side chain and decomposition by loss of acetic acid. In addition, by comparing CID spectra obtained with low- and high-energy collision, it is seen that CID-MS/MS with low-energy collision is more suitable for the study of the structural analysis of small molecules and drug metabolites. The experimental results demonstrate that MS/MS spectra can reflect more effectively the slight difference of structure between the related compounds and their structural characteristic features than MS spectra, and can also provide a beneficial analysis basis for these kinds of compounds. |
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Keywords: | taxol taxoids tandem mass spectrometry fragmentation behavior |
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