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Photoionization and Dissociative Photoionization Study of Cholesterol by IR Laser Desorption/Tunable Synchrotron VUV Photoionization Mass Spectrometr
Yang Pan1, Li-dong Zhang1, Hui-jun Guo1, Hao Yin2, Fei Qi *1
1.National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China;2.Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics,Hefei 230026, China
Abstract:
Elementary cholesterol was analyzed with IR laser desorption/tunable synchrotron vacuum ultraviolet photoionization mass spectrometry. An exclusive molecular ion of cholesterol is observed by near threshold single-photon ionization with high effciency. Fragments are yielded with the increase of photon energy. The structures of various fragments are determined with commercial electron ionization time-of-flight mass spectrometry. Dominant fragmentation pathways are discussed in detail with the aid of ab initio calculations.
Key words:  Cholesterol, Mass spectrometry, Laser desorption, Photoionization, Ab initio
FundProject:
Photoionization and Dissociative Photoionization Study of Cholesterol by IR Laser Desorption/Tunable Synchrotron VUV Photoionization Mass Spectrometr
潘洋1, 张李东1, 郭会军1, 尹浩2, 齐飞 *1
1.中国科学技术大学国家同步辐射实验室,合肥230029;2.中国科学技术大学合肥微尺度物质科学国家实验室,合肥230026
摘要:
介绍了一种将红外激光解吸/真空紫外光电离质谱技术应用于分析胆固醇的新方法. 由于近阈值单光子电离作用,可以在低能量下只产生纯净的胆固醇分子离子峰;增加光子能量则可以使碎片离子峰大量出现. 为了验证碎片离子的归属,利用商用高分辨电子轰击电离-飞行时间质谱仪分析并指认了胆固醇主要的碎片峰. 此外,采用量子化学从头算的方法研究了胆固醇母体离子和碎片构型,并讨论了部分主要的光解离机理
关键词:  胆固醇,质谱,激光解吸,光电离,从头计算
DOI:10.1088/1674-0068/22/02/129-133
分类号: