Development and characterization of griseofulvin loaded nanostructured lipid carrier gel for treating dermatophytosis

The present investigations were aimed at formulating topical gel containing nanostructured lipid carriers (NLCs) of griseofulvin and assess its effectiveness on superficial infections. The drug solubility studies were executed using various lipids and surfactants like Glyceryl monostearate, Oleic acid, Pluronic F 68, and Tween 80, and the concentrations of lipids, surfactants, and emulsifier were optimized using Box-Behnken design (BBD). Microemulsions were made utilizing sonication. The prepared batches (F1 to F15) were analyzed and observed that the optimized batch (F12), containing 0.2% w/w drug, 2% GMS, 2% Pluronic F68 and Tween 80 (in the ratio of 1:1) showed a particle size of 209 nm, zeta potential of -44.12 mV, entrapment level of 85.24% along with a drug release of 92.12%. Carbopol 940, 1.5% was used to make the topical gel. The results of biochemical studies reflected that griseofulvin-loaded-nanogel produced a more significant decrease in lipid peroxidation as compared to the standard drug. The in-vitro cytotoxicity studies showed better safety of nanogel in human keratinocyte cells (HaCaT). The results of antifungal activity showed complete clinical and mycological cure in a duration of 21 days against superficial infections like Tenia pedis and also ringworm in Wistar rats while using T.rubrum and M.canis fungal strains. These preclinical investigations have proved that the nanogels have a better potential in treating the aforementioned superficial infections providing an effective alternative for currently existing products.