Enthalpy of solution of tigogenin saponin in dioxane and the temperature dependence of its heat capacity

Bulat Kunurovich Kasenov, Zh. K. Tukhmetova, А. Ж. Абильдаева, Gaukhar Khabdolda, B. I. Tuleuov, Sergazy Mynzhasarovich Adekenov

2007

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DOI 10.1134/s0036024407080110

Data confidence 70 medium

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Abstract

The heats of solution of tigogenin C27H44O3 in dioxane at dilutions equal to 1: 9000, 1: 18 000, and 1: 36 000 (mol solute/mol solvent) have been studied by isothermal calorimetry. The standard enthalpy of C27H44O3 solution in dioxane at infinite dilution was derived by the mathematical processing of the calorimetric data. Dynamic calorimetry over the range 173–423 K has been used to study the heat capacity of tigogenin. The C p o ∼ f(T) plot has a jump at 298.15. K. The standard enthalpies of formation and combustion and the heat of melting of tigogenin have been indirectly calculated.