V. G. Badelin, E. Tyunina, A. Krasnov
Feb 8, 2012
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0
Influential Citations
11
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Journal
Russian Journal of Physical Chemistry A
Abstract
The sublimation of glycyl-L-α-alanine (Gly-Ala), L-α-alanyl-L-α-alanine (Ala-Ala), and DL-α-alanyl-DL-α-valine (Ala-Val) aliphatic dipeptides is studied by electron ionization mass spectrometry in combination with Knudsen effusion. The temperature range in which substances sublime as monomer molecular forms is determined. Enthalpies of sublimation ΔsH°(T) are determined for Gly-Ala, Ala-Ala, and Ala-Val. It is shown that the enthalpy of sublimation of dipeptides increases with an increase in the side hydrocarbon radical. The unknown ΔsH°(298) values for 17 amino acids and nine dipeptides are estimated using the proposed “structure-property” correlation model, in which the geometry and electron characteristics of molecules are used as structural descriptors.