On the role of the functional group in determining the strength of hydrophobic interactions in aqueous solutions of alpha-amino acid derivatives

被引:15
作者
Castronuovo, G
Elia, V
Velleca, F
机构
[1] Department of Chemistry, University Federico II of Naples, 80134 Naples, via Mezzocannone
关键词
alpha-amino acids; amino acid derivatives; hydrophobic interactions; hydrophilic interactions; excess enthalpies;
D O I
10.1007/BF00972593
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Calorimetric measurements were carried out at 25 degrees C on binary aqueous solutions containing N-acetyl derivatives of the following alpha-amino acids: glycine, alanine, valine, leucine, norleucine, aspartic acid, glutamic acid, phenylalanine, methionine, asparagine, glutamine, cysteine, histidine, serine. The N-acetyl derivative of the alpha-amino acid proline was also studied. The results obtained have been used to calculate the pairwise enthalpic interaction coefficients and these are compared with results reported in the literature concerning free alpha-amino acids, and their acetylamide derivatives. The coefficients largely increase passing from free amino acids to N-acetyl derivatives. The derivatives of alpha-amino acids bearing unsubstituted alkyl chains present an increased cooperativity of hydrophobic interactions.
引用
收藏
页码:971 / 982
页数:12
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