Estimation of partial molar volumes of α-amino acids in water
Estimation of partial molar volumes of α-amino acids in water
复制标题
水中 α-氨基酸的部分摩尔体积的估算
DOI：
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发表时间：
1984
期刊：
影响因子：
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通讯作者：
M. Rajeswari
中科院分区：
文献类型：
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作者：
M. Rao;M. Atreyi;M. Rajeswari
本文介绍了从甘氨酸的偏摩尔体积出发，估算α-氨基酸在水中的偏摩尔体积的方法。对于11种两性离子氨基酸，偏摩尔体积的估算值与文献中给出的实验值非常吻合，具有可电离侧链的氨基酸在水溶液中可以以不同的离子形式存在，并将密度法研究所得的偏摩尔体积与估算值进行了比较。该方法对赖氨酸和精氨酸的离子种类给出了良好的结果，其中侧链中的电荷中心与[图略]和α-COO-很好地分离，但不是对所有种类的天冬氨酸和谷氨酸。然而，对于两种二羧酸氨基酸，使用α，ω-氨基酸的数据的不同程序给出了偏摩尔体积的良好估计。
A method of estimating partial molar volumes of α-amino acids in water, starting from the partial molar volume of glycine, is described. For eleven zwitterionic amino acids the estimated partial molar volumes are found to be in very good agreement with the experimental values given in the literature.Amino acids having ionisable side chains can exist in aqueous solution as different ionic species; the partial molar volumes of these obtained from our densitimetric studies have been compared with the estimated values. The method gave good results for the ionic species of lysine and arginine, where the charge centre in the side chain is well separated from [graphic omitted] and α-COO–, but not for all species of aspartic and glutamic acids. However, for the two dicarboxylic amino acids a different procedure, using data for α,ω-amino acids, gave good estimates of the partial molar volumes.