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Determination of the rate of formation of the schiff bases of pyridoxal 5′-phosphate with polyallylamine

✍ Scribed by M. Angeles Garcí Del Vado; Angel F. Rodríguez Cardona; Gerardo R. Echevarría; José G. Santos Blanco; Consuelo López Zumel; Francisco García Blanco

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
586 KB
Volume
27
Category
Article
ISSN
0538-8066

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✦ Synopsis

The formation constants of the Schiff bases of pyridoxal %-phosphate with polyallylamine were determined over the pH range of the acetic-acetate buffer (3.9-5.5) a t an ionic strength of 0.1 M and a temperature of 25°C. The results were consistent with the rapid formation of an ionized carbinolamine, T + , followed by deprotonation, in the rate-determining step, to a neutral carbinolamine, T o . Subsequent dehydration of T o in a rapid step yields the final Schiff base. The formation of Tf is a concerted process subject to specific acid catalysis.

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