Reverse-phase high-performance liquid chromatography methodology for film-forming mafenide spray: Compatibility, assay, and in-vitro release evaluation using Franz vertical diffusion cell apparatus

This paper described a short and precise reverse-phase high-performance liquid chromatography (HPLC) method for quantifying mafenide in a film-forming spray and preliminary in-vitro release study. Following the International Council for Harmonization guidelines Q2 (R1), the method was validated. The chromatographic separation was achieved using a 10 mM potassium dihydrogen phosphate solution (mobile phase A) mixed with HPLC-grade methanol (mobile phase B) in an 85:15 v/v ratio. Inert Sustain C8 (4.6 x 250 mm), 5 mu m column was selected as the stationary phase. The flow rate was set as 0.8 mL/min, and detection was carried out at a wavelength of 222 nm. The developed HPLC method showed an accuracy between 98% and 102%. The primary diffusion study of film-forming spray was performed using the Franz vertical diffusion cell apparatus. It was observed that an average of 26.94% of drug releases at 24 h. This indicates the drug has a slower release rate and shows local pharmacological action. The Weibull dissolution model was more fitting with regression square 0.9953. Furthermore, the drug excipient compatibility study revealed no interactions as the only drug peak was found in the chromatographic method, indicating that the chosen excipients were appropriate for a stable formulation.