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Determination of the rates of formation and hydrolysis of the Schiff bases formed by pyridoxal 5′-phosphate and copolypeptides containing l-lysine

✍ Scribed by M.Angeles García del Vado; Gerardo R. Echevrría; José.G.Santos Blanco; Francisco Garciá Blanco

Publisher
Elsevier Science
Year
1993
Weight
585 KB
Volume
78
Category
Article
ISSN
0304-5102

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We determined the apparent equilibrium constant of formation, KpH, of the Schijf bases of pyridoxal 5'-phosphate (PLP) and poly-and copolymers containing L-lysine, as a function of pH at 25" and a constant ionic strength of 0 . 1 ~. The KPH values obtained at acidic and neutral pH were larger that t

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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

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The apparent rate constants of formation and hydrolysis of the Schiff bases formed between pyridoxal and polyallylamine has been fitted to a kinetic scheme that involve the different protonated species in the reaction medium and the individual rate constants of formation (k and hydrolysis (k ). The