Enthalpies of interaction of some N-acetyl amides of l

Add time:08/05/2019    Source:sciencedirect.com

The enthalpies of dilution of five dipeptides, namely, N-aeetyl-N '-methyl amides of l-serine, l-threonine and l-hydroxyproline, and JV-acetyl amides of l-threonine and l-hy-droxyproline dissolved in N, N-dirnethylformamide were measured calorimetrically at 298.15 K. From these, the enthalpic interaction coefficients were calculated. The pair-wise interaction coefficients of these dipeptides are compared with related amino acid derivatives with non-hydroxylated side chains. The influence of the hydroxyl group is discussed in terms of solute-solute-solvent interactions. The relevance of the results for biochemical systems is indicated.

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