化学
萃取电喷雾电离
电喷雾电离
质谱法
解吸电喷雾电离
环境电离
电离
质谱中的样品制备
化学电离
气体分析呼吸
直接电子电离液相色谱-质谱联用界面
离子
分析化学(期刊)
色谱法
离子源
电喷雾
有机化学
作者
Mufang Ke,Hua Zhang,Jianhua Ding,Xingchuang Xiong,Fenglei Li,Konstantin Chingin,Wei Kou,Àiyīng Liú,Tenggao Zhu,Xiang Fang,Huanwen Chen
标识
DOI:10.1021/acs.analchem.8b03114
摘要
Supercharged protein ions produced by electrospray ionization are extremely efficient proton donors for secondary ionization. Here, by electrospraying the protein solutions containing 5% 1,2-butylene carbonate, the supercharged protein ions with unusually high proton density were produced as the primary ions for the ionization of exhaled breath samples in the extractive electrospray ionization mass spectrometry (EESI-MS), which resulted in the enhanced ionization efficiency for the breath analytes even with relatively low gas phase basicity. Moreover, the total number of metabolites detected in breath increased by about 260% in the mass range of 200-500 Da, owing to the substantial signal enhancement for breath metabolites, providing complementary and additional information to conventional SESI.
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