Identification of carbonylated peptides by tandem mass spectrometry using a precursor ion-like scan in negative ion mode

2011 ◽  
Vol 74 (11) ◽  
pp. 2351-2359 ◽  
Author(s):  
Ravi Ch. Bollineni ◽  
Maria Fedorova ◽  
Ralf Hoffmann
Keyword(s):  
Mass Spectrometry ◽  
Tandem Mass Spectrometry ◽  
Negative Ion ◽  
Tandem Mass ◽  
Negative Ion Mode

Fragmentation Studies of Monensin A and B in Negative Electrospray and Nanospray Tandem Mass Spectrometry

2007 ◽  
Vol 13 (3) ◽  
pp. 191-198 ◽  
Author(s):  
José N. Sousa-Junior ◽  
Paul J. Gates ◽  
Norberto P. Lopes
Keyword(s):  
Mass Spectrometry ◽  
Tandem Mass Spectrometry ◽  
Major Product ◽  
Negative Ion ◽  
Tandem Mass ◽  
Fragmentation Chemistry ◽  
Product Ions ◽  
Low Mass ◽  
Monensin A ◽  
Negative Ion Mode

This paper reports the first comparative study of the gas-phase fragmentation chemistry of monensin in negative ion mode electrospray and nanoelectrospray tandem mass spectrometry. The fragmentation was observed to occur at lower energies in nanoelectrospray than electrospray. The major product ions are proposed to be formed via an initial neutral elimination of methanol followed be subsequent fragmentation. The low-mass product ions were observed at the same m/z for both monensin A and B.

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