A novel of polymer combination promotes an increase of the ability for controlling the drug release. The objective of this research was to characterize the inter-polymer complexes (IPCs) of Eudragit (Eud) types (Eud RS, Eud L, or Eud E) and Kollidon SR (KSR), and elucidate their effects on the drug release kinetics and mechanism. Different preparation techniques were proposed using spray drying and ultrasonic-assisted anti-solvent techniques. The thermal activity e.g. glass transition temperature (Tg), and fourier transform infrared spectroscopy were used to characterize the molecular interaction of these IPCs. The effect on the drug release kinetics and mechanism was the main concern of this study. Depending on the results, the hydrogen bonding formation between polymers was observed by a shifting of OH and carbonyl group vibrations. In addition, the van der Waals interaction was identified by an alteration in the vibrational band around the 1000-1500 cm-1. Meanwhile, the change of physicochemical characteristic was identified by the Tg of IPCs. Eud E-KSR and Eud E-Eud L IPC was unable to control the drug release. Meanwhile, Eud L-KSR IPC and Eud RS-KSR IPC were success to control the drug release, but it was pH dependent and independent, respectively. This study concluded that the IPCs allowed the drug release in a controlled manner based on the IPC characteristics and their interactions. Either positive or negative interactions on the drug release were observed due to native characteristics of polymers.
Key words: Eudragit, Kollidon SR, Inter-polymer complex, drug release
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