Objective: A novel natural polymer, Gum Ghatti (GG) was explored to develop a new polymeric
system that will combine the biodegradable and biocompatible properties of GG and mechanical
properties of poly vinyl alcohol (PVA) for drug delivery application.
Methods: Smart pH sensitive, porous, glutaraldehyde (GA) crosslinked interpenetrating network (IPN)
microspheres loaded with glipizide were developed by the emulsion crosslinking method. The drug
entrapment efficiency was 92.85±1.5%. FTIR confirmed the formation of IPN structure. Drug release
can be extended upto 7 hours by modulating the concentration of crosslinking agent. Swelling study and
diffusion co-efficient (D) of water transport were performed in order to understand the phenomenon of
water penetration through the microsphere. In vivo antidiabetic activity performed on alloxane induced
diabetic rats indicated that in case of pure glipizide sudden reduction of elevated blood glucose was
observed after 3 hours.
Results: In case of rats treated with glipizide loaded IPN microparticles, the initial percentage reduction
of blood glucose level was slow within the first 3 hours of administration, as compared to pure glipizide
but after 6 hours 90% reduction was observed which confirmed sustained release nature of microspheres.
Conclusion: Thus IPN microparticles were found suitable for sustained delivery of BCS class II drug