Differential scanning calorimetry study of the phase transition in diserine sulfate monohydrate crystals

Differential scanning calorimetry (DSC) was used under the highest resolution conditions to study the phase transition in diserine sulfate monohydrate crystals. In the temperature range 255–270 K, the DSC signal was found to exhibit sharp Λ-shaped peaks with a thermal hysteresis of 8.5 K, which indicates the occurrence of a first-order phase transition. The experimental data are used to determine the thermodynamic parameters of the phase transition.