Abstract
Constants of the stepwise dissociation of L-alanyl-L-histidine (HL) at 298.15 K and ionic strengths of 0.1, 0.5, 1.0, and 1.5 (KNO3) are found potentiometrically. Thermal effects of dissociation are measured for the dipeptide via direct calorimetry. Standard thermodynamic parameters (pK°, ΔdisG°, ΔdisH°, and ΔdisS°) of HL protolytic equilibria are calculated from thermochemical and potentiometric data obtained under identical experimental conditions. The results are compared to those of similar compounds.
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