کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1196303 | 964555 | 2010 | 8 صفحه PDF | دانلود رایگان |
In-source decay (ISD) and post-source decay (PSD) of a peptide ion ([Y6 + H]+) and a preformed ion (benzyltriphenylphosphonium, BTPP) generated by matrix-assisted laser desorption ionization (MALDI) were investigated with time-of-flight mass spectrometry. α-Cyano-4-hydroxycinammic acid (CHCA) and 2,5-dihydroxybenzoic acid (DHB) were used as matrices. For both ions, ISD yield was unaffected by delay time, indicating rapid termination of ISD. This was taken as evidence for rapid expansion cooling of hot “early” plume formed in MALDI. CHCA was hotter than DHB for [Y6 + H]+ while the matrix effect was insignificant for BTPP. The “early” plume temperature estimated utilizing previous kinetic results was 800–900 K, versus 400–500 K for “late” plume. The results support our previous finding that the temperature of peptide ions interrogated by tandem mass spectrometry was lower than most rough estimates of MALDI temperature.
Graphical AbstractISD of peptide ions in MALDI occurs in hot (800–900 K) early plume. Ions cooled to 400–500 K in supersonic expansion contribute to PSD.Figure optionsDownload high-quality image (93 K)Download as PowerPoint slide
Journal: Journal of the American Society for Mass Spectrometry - Volume 21, Issue 11, November 2010, Pages 1876–1883