*Nikunjana A. Patel and Rakesh P. Patel


The focus of this investigation was to confirm the potential of chemically modified cyclodextrins (hydroxypropyl- β-cyclodextrin (HP-β-CD/Kleptose® HPB) and sulfobutylether-β-cyclodextrin (SBE-β-CD/Captisol®)) to improve the dissolution rate of Reserpine in oral delivery. Native and modified cyclodextrins were screened via phase solubility studies in order to select the most efficient cyclodextrin in formation of stable inclusion complexes. AP –type phase solubilization resulted from phase solubility diagrams of all cyclodextrin indicated formation of 2:1 stoichiometric inclusion complexes between CDs and Reserpine. Gibbs free energy (Gtr) values were all negative, indicating the spontaneous nature of Reserpine solubilization, and they decreased with increase in the cyclodextrins concentration, demonstrating that the reaction conditions became more favorable as the concentration of cyclodextrins increased. The inclusion complexes of Reserpine and both cyclodextrins were prepared in 2:1 molar ratio by various methods such as physical mixing, kneading, spray drying and lyophilization. The complexes characterized by Fourier-transform infrared (FTIR) spectroscopy differential scanning calorimetry (DSC) and Scanning electron microscopy (SEM) studies delineates amorphousness as well as the successful inclusion of the Reserpine molecule into the cyclodextrin cavity. The complexation exhibited marked improvement in the solubility and wettability of Reserpine. These complexes exhibited substantially higher and faster rates of dissolution compared to that of Reserpine and physical mixture. Physical mixture also showed significant improvement in the dissolution rate compared to pure Reserpine. Mean dissolution time (MDT) of Reserpine decreased significantly after preparation of complexes and physical mixture. Similarity factor (f2) indicated significant difference between the release profiles of Reserpine from complexes, physical mixture and from pure Reserpine.

Keywords: Reserpine, hydroxypropyl-?-cyclodextrin, sulfobutyl-?-cyclodextrin, inclusion complexation, invitro dissolution studies.

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