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Updated: Apr 20, 2026

X-Ray Crystallography to Study the Oligomeric State Transition of the Thermotoga maritima M42 Aminopeptidase TmPep1050
Published on: May 13, 2020
Thermodynamic and kinetic investigation of agomelatine polymorph transformation
Qi Zhang1, Linglei Jiang1, Xuefeng Mei1
1a Pharmaceutical Analytical & Solid-State Chemistry Research Center , Shanghai Institute of Materia Medica, Chinese Academy of Sciences , Shanghai , China.
Abstract:
Thermodynamic properties of polymorphic forms I and II of Agomelatine were investigated and the bimorphism was determined to be monotropically related. The phase transition kinetics from metastable form I to thermodynamically stable form II was studied and a quantification method was developed based on X-ray powder diffraction technique. Various solid-state kinetic models were examined and the results were fit to the experimental data. The nucleation kinetic models were found to be the best fit to describe the experimental data across the temperature range. The activation energy of the form transformation was calculated in the range of 116-122 kJ mol(-1), irrespective of which kinetic model selected.
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