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第42卷 第4期 onst-atedthefolowingt-end'PSIVESIVnanoESI, in whichPSI
gavethesoftestionizationpe-fo-mance-elativetoothe-twoionizationsou--
ally, when commercially available 92 $ and 95 $ (Research Octane Number, RON)
gasoineswereusedforana%ysis , PSI was favorab%e to give moreintensivepeaksfor
国家自然科学基金(21777128)#陕西省自然科学基础研究计划项目( 2019JC33)陕西高校青年创新团队项目( Z19257)
本文通信作者张智平第4期 许泽汝等：纸喷雾软电离质谱分析性能研究 391
stronger polar compounds, whereas more abundant peaks for weaker polar compounds
were observed in mass spectra by ESI and nanoESI. When proteins such as myoglobin
and cytochrome c were ionized, the charge state distribution (CSD) for PSI moved to
higher mass-to-charge ratios relative to ESI and nanoESI, and the average charge states
(ZaQ from PSI were lower than those from ESI and nanoESI. As an example for myo­
globin, the Zave value was 18. 07 + 0. 01 for PSI, whereas the corresponding values were
19. 47 + 0. 01 (ESI) and 19. 67 + 0. 01 (nanoESI) in comparable experimental conditions
(. = 3), respectively. When cytochrome c was used for analysis , the Zave values were
14. 14 + 0. 17 (PSI) , 14. 44 + 0. 13 (ESI) and 14. 67 + 0. 01 (nanoESI) , respectively. As
GAPsamplewasanalyzedusingPSI itwasmorefavorabletomaintainthestructuresof
intact GAP , and both the number-average molecular weight (Mn) and weight-average
molecular weight (Mw) had higher values. For both ESI and nanoESI , lower values of
Mnand Mw wereobtained&Theseresultsprovidedconfidentevidencesthattheperform-
anceofPSIwasmuchsofterinionizingdiferenttypesofcompoundsthanthoseofESI
and nanoESI&The investigation on the performance of various ionization sources can
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