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We propose a simple approach to investigate the structural relaxation time and glass transition of amorphous drugs. Amorphous materials are modeled as a set of equal sized hard spheres. The structural relaxation time over many decades in hard sphere fluids is theoretically calculated using the Elastically Collective Nonlinear Langevin Equation theory associated with Kramer's theory. Then, a new thermal mapping from a real material to an effective hard sphere fluid provides temperature-dependent relaxation time, which can compare to experiments. Numerical results quantitatively agree with previous experiments for pharmaceutical binary mixtures having different weight ratios. We carry out experiments to test our calculations for an ezetimibe-simvastatin-Kollidon VA64 mixture. Our approach would provide a simple but comprehensive description of glassy dynamics in amorphous composites.
This article was published in the following journal.
Name: Molecular pharmaceutics
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Predicting the Physical Stability of Amorphous Tenapanor Hydrochloride using Local Molecular Structure Analysis, Relaxation Time Constants and Molecular Modelling Sanjeev Kothari and Radha R. Vippagunta* Pharmaceutical Chemistry and Formulations, Ardelyx, 34175 Ardenwood Blvd, Fremont, CA 94555, USA. *Corresponding Author: firstname.lastname@example.org; Phone :5104567717.
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