Low-temperature heat capacity and standard thermodynamic functions of D-galactose and galactitol

Abstract

The heat capacities of D-galactose and galactitol were measured on a quantum design physical property measurement system(PPMS) over a temperature range of 1.9―300 K, and the experimental data were fitted to a function of T using a series of theoretical and empirical models in appropriate temperature ranges. The fit results were used to calculate thermodynamic function values, C p,m θ , Δ 0 S m θ , and Δ 0 H m θ from 0 K to 300 K. The standard molar heat capacity, entropy and enthalpy values of D-galactose and galactitol at 298.15 K and 0.1 MPa were determined to be C p,m θ =(227.96±2.28) and (239.50±2.40) J·K−1·mol−1, S m θ = (211.22±2.11) and (230.82±2.30) J·K−1·mol−1 and H m θ = (33.95±0.34) and (36.57± 0.37) kJ/mol, respectively.