Kinetics and enthalpy of crystallization of uric acid dihydrate

The kinetics of crystallization of uric acid dihydrate in aqueous solution with a constant ionic strength 0.3 mol dm−3 NaCl and at thermodynamic and physiological temperature (25 and 37 °C) was studied using isoperibolic reaction twin calorimeter. The enthalpy of crystallization ΔcrH = −47.3 ± 0.9 and −46.2 ± 1.4 kJ mol−1and kinetic constant kg = 2.0 × 10−8 and 9.6 × 10−8 m4 s−1 mol−1 were determined at 25 and 37 °C, respectively.