Kinetics of nitrosation of four dipeptides. N-Terminal in proline

The kinetics of nitrosation for the imino nitrogen of dipeptides N terminal in proline were studied. The pH optima for nitrosation of four dipeptides were, for Pro-Gly, pH 2.7, for Pro-Hyp, pH 2.7, for Pro-Ser, pH 2.9, and, for Pro-Glu, pH 3.0. On the basis of a determination of the initial rates of...

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Bibliographic Details
Published in:Journal of agricultural and food chemistry 1984-03, Vol.32 (2), p.404-406
Main Authors: Kubacka, Wanda, Scanlan, Richard A
Format: Article
Language:English
Subjects:
Analytical biochemistry: general aspects, technics, instrumentation
Analytical, structural and metabolic biochemistry
Biological and medical sciences
carcinogens
dipeptides
Fundamental and applied biological sciences. Psychology
nitrogen
nitrosation
proline
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Summary:The kinetics of nitrosation for the imino nitrogen of dipeptides N terminal in proline were studied. The pH optima for nitrosation of four dipeptides were, for Pro-Gly, pH 2.7, for Pro-Hyp, pH 2.7, for Pro-Ser, pH 2.9, and, for Pro-Glu, pH 3.0. On the basis of a determination of the initial rates of nitrosation the pH-dependent rate constants at optimal pH and 25 degree C were 0.26 M super(-2) s super(-1) for Pro-Gly, 0.19 M super(-2) s super(-1) for Pro-Hyp, 0.29 M super(-2) s super(-1) for Pro-Glu, and 0.18 M super(-2) s super(-1) for Pro-Ser.
ISSN:0021-8561
1520-5118
DOI:10.1021/jf00122a056