Low-temperature heat capacity and standard thermodynamic functions of β-d-(-)-arabinose (C5H10O5)

• Heat capacity was measured using a PPMS over the range from T = (1.9 to 300) K.
• A heat capacity crossover between β-d-(-)-arabinose and d-xylose was observed at T = 46 K.
• Standard thermodynamic functions were calculated based on the heat capacity data.

The heat capacities of β-d-(-)-arabinose were measured using a Quantum Design Physical Property Measurement System (PPMS) over the temperature range from (1.9 to 300) K, and the experimental values were fitted as a function of temperature using a series of theoretical and empirical models in the appropriate temperature ranges, from which the corresponding thermodynamic functions were calculated. The standard molar heat capacity, entropy and enthalpy of β-d-(-)-arabinose at T = 298.15 K and P = 0.1 MPa were determined to be Cp,mo = (186.29 ± 1.86) J · K−1 · mol−1, Smo = (181.72 ± 1.83) J · K−1 · mol−1 and Hmo = (28.52 ± 0.29) kJ · mol−1, respectively.

Experimental and fitted molar heat capacities of β-d-(-)-arabinose from T = (1.9 to 300) K.Figure optionsDownload as PowerPoint slide