Determination of the Rates of Formation and Hydrolysis of the Schiff Bases Formed by Pyridoxal 5′-Phosphate with L-Tryptophan and Its Methyl and<i>n</i>-Butyl Esters
作者:Gerardo. R. Echevarría Gorostidi、José G. Santos、Andrea Basagoitia、Francisco García Blanco
DOI:10.1246/bcsj.75.2471
日期:2002.11
The apparent rate constants of the formation (k1) and hydrolysis (k2) of the Schiff bases formed by pyridoxal 5′-phosphate with L-tryptophan and their methyl and n-butyl esters at a variable pH, 25 °C, and an ionic strength of 0.1 M were determined, along with the equilibrium constant (KpH). The individual rate constants of formation and hydrolysis of the Schiff bases of systems corresponding to different
由 5'-磷酸吡哆醛与 L-色氨酸及其甲基和正丁基酯形成的席夫碱形成 (k1) 和水解 (k2) 的表观速率常数,在可变 pH、25 °C 和离子测定了 0.1 M 的强度以及平衡常数 (KpH)。还确定了与介质中存在的不同化学物质相对应的系统的席夫碱形成和水解的单独速率常数,作为其酸度的函数,席夫碱的 pK 值也是如此。证明了 α-羧基对席夫碱的形成和水解常数及其 pK 值的影响。