Low-temperature heat capacity and thermodynamic functions of vitamin B12

被引：14

作者：

Knyazev, A. V. ^{[1
]}

Smirnova, N. N. ^{[1
]}

Plesovskikh, A. S. ^{[1
]}

Shushunov, A. N. ^{[1
]}

Knyazeva, S. S. ^{[1
]}

机构：

[1] Lobachevsky State Univ Nizhni Novgorod, Nizhnii Novgorod 603950, Russia

来源：

THERMOCHIMICA ACTA | 2014年 / 582卷

基金：

俄罗斯基础研究基金会;

关键词：

Vitamin B-12; Cyanocobalamin; Adiabatic vacuum calorimetry; Heat capacity; Thermodynamic functions; Differential scanning calorimetry;

D O I：

10.1016/j.tca.2014.02.025

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

In the present work temperature dependence of heat capacity of vitamin B-12 (cyanocobalamin) has been measured for the first time in the range from 6 to 343 K by precision adiabatic vacuum calorimetry. Based on the experimental data, the thermodynamic functions of the vitamin B-12, namely, the heat capacity, enthalpy H degrees(T)-H degrees(0), entropy S degrees(T) S degrees(0) and Gibbs function G degrees(T)-H degrees(0) have been determined for the range from T -> 0 to 343 K. The value of the fractal dimension D in the function of multifractal generalization of Debye's theory of the heat capacity of solids was estimated and the character of heterodynamics of structure was detected. The thermal stability of cyanocobalamin was also studied by differential scanning calorimetry. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：35 / 39

页数：5

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