Formulation and Evaluation of Capsule-in-Capsule Technology for Biphasic delivery of Glipizide

In the present research work, to formulation and evaluation of capsule-in-capsule technology for biphasic delivery of Glipizide. The advantages of fast releasing liquid-filled-capsules and slow release beads-filled-capsules were combined to meet the optimized requirements of our biphasic drug delivery system. Glipizide slow releasing beads were prepared by ionotrophic gelation method by using natural polymers like Sodium alginate, Pectin and were filled into a smaller capsule. Glipizide fast releasing liquid dispersion was prepared by using either Castor oil carriers and further prepared a glipizide emulsion. This fast releasing liquid and slow releasing beads-filled-capsule was further inserted into a bigger capsule body and Seal the capsule by hydro alcoholic solution. The various formulation batches were subjected to physicochemical studies, entrapment efficiency, drug content, in vitro drug release and stability studies. Interaction studies reveal that there was no interaction between drug and polymers employed in this study. The optimized capsule-in-a-capsule formulation released 22.65±0.74% of drug at the end of 30 min and 95.04±0.88% of drug at the end of 12h. The drug release profile of Glipizide capsule-in-a-capsule formulation fits well with Pepas model followed by zero order, first order and Korsemeyer-peppa’s model. Korsmeyer-Peppas model analysis indicated that the drug release followed non-Fickian transport mechanism. The stability results indicate that the various parameters of our optimized formulation are not affected on storage at 45°C/75%RH up to 4 months. Target of capsule-in-capsule drug delivery loading dose reaches therapeutic drug level in blood plasma for quicker onset of action and Maintenance dose which maintain an effective therapeutic level for prolong period. The prepared Glipizide biphasic cap-in-cap will be used for treatment of Diabetes.