Development, Characterization and In Vitro Antimicrobial Evaluation of Novel Flavonoids Entrapped Micellar Topical Formulations of Neomycin Sulfate.

Flavonoids are the secondary metabolites widely used in pharmaceutical industries due to their several health benefits. Quercetin and rutin, well known flavonoids possesses various pharmacological properties but the constraints of poor aqueous solubility and impermeability across cell membranes restricts their use in formulation development. Moreover, the rising problem of antimicrobial resistance has also caused a serious threat to human life, thus demanding the urgent need of developing more effective antimicrobial formulations. In view of this, the present research work is focused on utilizing the most feasible flavonoid-surfactant concentrations obtained from the already reported physico-chemical analysis in developing an improved neomycin topical formulation through drug combinatorial approach. The formulations were subjected for assessment of physical parameters such as determination of pH, viscosity and spreadability. The drug release profile of the formulations was studied through different mathematical models. After evaluation of all the parameters, two best formulations (NQ-T2 [HE] and NR-T1 [HE]) were selected for antimicrobial evaluation studies against different bacterial and fungal clinical isolates. Among the two formulations, NQ-T2 [HE] showed excellent antibacterial activity against the bacterial strains while NR-T1 [HE] also exhibited promising results when compared with the standard formulations. Overall, this study represents a possible solution to enhance the antimicrobial efficacy of neomycin formulations by combining them with flavonoids through micelles assisted drug combination approach.