Abstract
The ability of amylodextrin (a linear dextrin) to act as a complexing agent or as a carrier for solid dispersion was evaluated. Blends of amylodextrin with diazepam or prednisolone were freeze-dried and kneaded at elevated temperatures, respectively. The products were analyzed by DSC, X-ray diffractometry, and FTIR spectroscopy. Complex formation with amylodextrin by freeze-drying was found not to occur for diazepam but for prednisolone at a molar ratio of 1 to 1. The freeze-dried product of diazepam with amylodextrin proved to be a solid dispersion. Solid dispersions were formed by both wet (with ethanol) and dry kneading at elevated temperatures of low-melting drugs such as lidocain, diazepam, and methyl-PABA with amylodextrin. No solid dispersions were obtained for high-melting drugs such as prednisolone and salicylic acid. The results point to the formation of solid dispersions by a melting mechanism during the process of kneading at elevated temperatures of low-melting drugs with amylodextrin.
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Te Wierik, G.H.P., Eissens, A.C., Besemer, A.C. et al. Preparation, Characterization, and Pharmaceutical Application of Linear Dextrins. II. Complexation and Dispersion of Drugs with Amylodextrin by Freeze-Drying and Kneading. Pharm Res 10, 1280–1284 (1993). https://doi.org/10.1023/A:1018957410821
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DOI: https://doi.org/10.1023/A:1018957410821