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Photoionization and Dissociative Photoionization Study of Cholesterol by IR Laser Desorption/Tunable Synchrotron VUV Photoionization Mass Spectrometr
Yang Pan,Li-dong Zhang,Hui-jun Guo,Hao Yin,Fei Qi *
Author NameAffiliationE-mail
Yang Pan National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China  
Li-dong Zhang National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China  
Hui-jun Guo National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China  
Hao Yin Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics,Hefei 230026, China  
Fei Qi * National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China fqi@ustc.edu.cn 
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,张李东,郭会军,尹浩,齐飞 *
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: