Graduate School of Nanobioscience, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama, Kanagawa, 236-0027, Japan.
J Am Soc Mass Spectrom. 2012 Jun;23(6):1109-19. doi: 10.1007/s13361-012-0363-5. Epub 2012 Apr 17.
The interaction between negative atmospheric ions and various types of organic compounds were investigated using atmospheric pressure corona discharge ionization (APCDI) mass spectrometry. Atmospheric negative ions such as O(2)(-), HCO(3)(-), COO(-)(COOH), NO(2)(-), NO(3)(-), and NO(3)(-)(HNO(3)) having different proton affinities served as the reactant ions for analyte ionization in APCDI in negative-ion mode. The individual atmospheric ions specifically ionized aliphatic and aromatic compounds with various functional groups as atmospheric ion adducts and deprotonated analytes. The formation of the atmospheric ion adducts under certain discharge conditions is most likely attributable to the affinity between the analyte and atmospheric ion and the concentration of the atmospheric ion produced under these conditions. The deprotonated analytes, in contrast, were generated from the adducts of the atmospheric ions with higher proton affinity attributable to efficient proton abstraction from the analyte by the atmospheric ion.
采用大气压电晕放电离子化（APCDI）质谱法研究了大气负离子与各种类型有机化合物的相互作用。具有不同质子亲和力的大气负离子（如 O(2)(-), HCO(3)(-), COO(-)(COOH), NO(2)(-), NO(3)(-), 和 NO(3)(-)(HNO(3))) 作为反应离子，在 APCDI 负模式下用于分析物的离子化。在特定的放电条件下，个别大气离子特异性地将具有各种官能团的脂肪族和芳香族化合物离子化为大气离子加合物和去质子化的分析物。在某些放电条件下形成大气离子加合物的原因很可能是分析物与大气离子之间的亲和力以及在这些条件下产生的大气离子的浓度。相比之下，去质子化的分析物是由大气离子与具有更高质子亲和力的加合物生成的，这归因于大气离子从分析物中有效抽取质子。
