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Determination of the rates of formation and hydrolysis of the Schiff bases of pyridoxal with polyallylamine

✍ Scribed by M.Angeles García del Vado; Angel F.Rodríguez Cardona; Gerardo R.Echevarría Gorostidi; M.Carolina González Martinez; JoséG.Santos Blanco; Francisco García Blanco

Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 511 KB
Volume: 101
Category: Article
ISSN: 1381-1169
DOI: 10.1016/1381-1169(95)00074-7

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✦ Synopsis

The rate constants of formation (k,) and hydrolysis ( k2 of the Schiff bases formed between pyridoxal (PL) and polyallylamine were determined as a function of pH at a temperature of 25°C and an ionic strength I = 0.1 M. The k, values obtained at every pH studied exceeded those for the Schiff bases of PL with poly-L-lysine and n-hexylamine, which is consistent with a favoured intramolecular acid catalysis of the dehydration of the intermediate carbinolamine formed in the process. The Schiff bases examined in this work lie in a hydrophobic environment and the pK for their imine group is smaller than 9.2.

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