Abstract
The effect of hydroxypropyl cellulose (HPC) and hydroxypropyl methylcellulose (HPMC) on carbamazepine (CBZ) polymorphic transformation has been investigated by an attenuated total reflectance-infrared (ATR-IR) spectroscopy and chemoinformatics. CBZ anhydrate samples were each kneaded with 35.0 μL of pure water, aqueous solution of 0.005 w/v% HPC, or that of 0.005 w/v% HPMC. Each paste was put on a germanium glass of an ATR accessory and was covered with a sheet of Parafilm® at 20 ± 2 °C. Measured IR spectra were analyzed by a multivariate curve resolution-alternating least squares (MCR-ALS) and a two-dimensional correlation spectroscopic analysis. Source vectors of MCR-ALS were assigned to CBZ anhydrate and dihydrate. Concentration data of MCR-ALS were evaluated for the kinetics of CBZ polymorphic transformation. The combination of ATR-IR spectroscopy and MCR-ALS is concluded to be useful for the elucidation of rapid polymorphic transformation in suspension. The transformation rate is delayed by HPC and HPMC.
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