MICELLAR CATALYTIC EFFECTS ON THE KINETICS OF THE IONIZATION OF BASIC-AMINO-ACID AND ACIDIC AMINO-ACID STUDIED BY THE ULTRASONIC-ABSORPTION METHOD

被引：2

作者：

YAMASHITA, T

YAMASAKI, M

SANO, T

HARADA, S

YANO, H

机构：

[1] DAIICHI COLL PHARMACEUT SCI,MINAMI KU,FUKUOKA 815,JAPAN

[2] HIROSHIMA UNIV,FAC SCI,DEPT MAT SCI,HIGASHIHIROSHIMA 724,JAPAN

[3] HIROSHIMA BUNKYO WOMENS COLL,ASAKITA KU,HIROSHIMA 73102,JAPAN

来源：

LANGMUIR | 1995年 / 11卷 / 05期

关键词：

D O I：

10.1021/la00005a012

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Base equilibria of arginine (basic amino acid) in the absence of a micelle and then in a micellar solution of sodium dodecyl sulfate (SDS) have been studied by ultrasonic absorption measurements. Forward (gamma(2)k(f)) and backward (k(b)) rate constants, the apparent base dissociation constant K-b (=k(h)/gamma(2)kf), and the volume change (Delta V) for the reaction were obtained. Micellar effects for arginine were greater than those for a neutral amino acid measured previously. This is discussed in terms of total charge of the amino acids. Similar experiments were carried out for aspartic acid (acidic amino acid)-cationic micelle of dodecyl-ammonium chloride (DAC). Relaxation was considered due to the protolysis of aspartic acid. A slightly lower micellar effect than that for an aromatic carboxylic acid-dodecylammonium chloride (DAC) system was noted. Delta V was smaller than that for an aromatic carboxylic acid with the same pK(a).

引用

页码：1477 / 1481

页数：5

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