Gastroretentive floating sterculia-alginate beads for use in antiulcer drug delivery

To improve the bioavailability and therapeutic efficacy of the drugs used for the diseases associated with the stomach, the retention of drug delivery systems in the stomach for longer time is requred. Therefore, in the present study, an attempt has been made to synthesize gastro-retentive floating drug delivery system by simultaneously ionotropic gelation of alginate and sterculia gum by using CaCl2 as crosslinker. The beads thus formed have been characterized by scanning electron micrographs (SEMs), electron dispersion X-ray analysis (EDAX), Fourier transform infrared spectroscopy (FTIR) analysis. The swelling of beads has been carried out as a function of various reaction parameters and pH of the swelling media. In addition, in vitro release dynamics of anti-ulcer model drug pantoprazole from drug loaded beads in different release media has been carried out for the evaluation of the drug release mechanism and diffusion coefficients. Release of drug from beads occurred through Fickian type diffusion mechanism. (C) 2010 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.