Flame Atmospheric Pressure Chemical Ionization Coupled with Negative Electrospray Ionization Mass Spectrometry for Ion Molecule Reactions
Journal Article
·
· Journal of the American Society for Mass Spectrometry
- National Sun Yat-Sen University, Department of Chemistry (China)
Flame atmospheric pressure chemical ionization (FAPCI) combined with negative electrospray ionization (ESI) mass spectrometry was developed to detect the ion/molecule reactions (IMRs) products between nitric acid (HNO{sub 3}) and negatively charged amino acid, angiotensin I (AI) and angiotensin II (AII), and insulin ions. Nitrate and HNO{sub 3}-nitrate ions were detected in the oxyacetylene flame, suggesting that a large quantity of nitric acid (HNO{sub 3}) was produced in the flame. The HNO{sub 3} and negatively charged analyte ions produced by a negative ESI source were delivered into each arm of a Y-shaped stainless steel tube where they merged and reacted. The products were subsequently characterized with an ion trap mass analyzer attached to the exit of the Y-tube. HNO{sub 3} showed the strongest affinity to histidine and formed (M{sub histidine}-H+HNO{sub 3}){sup –} complex ions, whereas some amino acids did not react with HNO{sub 3} at all. Reactions between HNO{sub 3} and histidine residues in AI and AII resulted in the formation of dominant [M{sub AI}-H+(HNO{sub 3})]{sup -} and [M{sub AII}-H+(HNO{sub 3})]{sup –} ions. Results from analyses of AAs and insulin indicated that HNO{sub 3} could not only react with basic amino acid residues, but also with disulfide bonds to form [M-3H+(HNO{sub 3}){sub n}]{sup 3-} complex ions. This approach is useful for obtaining information about the number of basic amino acid residues and disulfide bonds in peptides and proteins. .
- OSTI ID:
- 22776913
- Journal Information:
- Journal of the American Society for Mass Spectrometry, Journal Name: Journal of the American Society for Mass Spectrometry Journal Issue: 7 Vol. 28; ISSN 1044-0305; ISSN JAMSEF
- Country of Publication:
- United States
- Language:
- English
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