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Collision induced dissociation of deprotonated glycolic acid

✍ Scribed by Michael Baker; Wojciech Gabryelski


Book ID
108146519
Publisher
Elsevier Science
Year
2007
Tongue
English
Weight
797 KB
Volume
262
Category
Article
ISSN
1387-3806

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## Abstract Deprotonated dipeptides, on collisional activation, fragment by the characteristic process NH~2~CH(R^1^) CONHCH(R^2^)CO~2~^βˆ’^ β†’ NH~2~^βˆ’^C(R^1^)CONHCH(R^2^)CO~2~H β†’ ^βˆ’^NHCH(R^2^)CO~2~H + NH~2~C(R^1^)ο£ΎCο£ΎO, when R^1^ and R^2^ = H or alkyl. However, when one of the constituent amino acids i

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2 O as ionizing reagents, is discussed. The negative chemical ionization mass spectra show that, in the absence of a hydroxy group in the aromatic ring, deprotonation takes place at the benzylic position whereas the proton is lost from the OH group when present. The nitro compound forms only M ÀÁ io