FORMULATION, DEVELOPMENT AND IN-VITRO EVALUATION OF A BAMBUTEROL HYDROCHLORIDE IN-SITU GELLING SYSTEM FOR NASAL DELIVERY

The goal of this project was to design, develop, and in-vitro evaluation of an in-situ gelling system for nasal administration of Bambuterol hydrochloride. All of the batches were prepared using different concentration of pectin, given different doses of simulated nasal electrolyte solution (SNES) i.e., 0.1 ml to 2.0 ml. All batches and formulation batches with a composition of 0.8 percent low methoxyl pectin underwent an in vitro gelation testing. The pH of the formulation reduced as the pectin content increased due to the acidic nature of pectin. The drug concentration was greater than 95%, and the apparent viscosity of the sol and gel was measured using a Brookfield viscometer (Rotational Viscometer Model). When the concentration of gelling polymer was increased from 0.5 to 1.0 percent, the gel strength (SOL) increased from 0.6 to 1 sec. The gel strength (GEL) increased from 0.7 to 13 seconds as a result of gelation. In vitro drug release experiments showed that the resulting formulations could release the medication for up to 10 hours when Higuchi kinetics were applied to all of them. The gels were stable across the six-month test period, according to the accelerated stability studies. There was no drug-polymer interaction, according to DSC and XRD analyses. Based on these findings, in situ nasal gel could be a possible drug delivery strategy for bambuterol hydrochloride, allowing it to bypass first-pass metabolism and hence improve bioavailability.