Greenness assessment of a stability indicating simple inexpensive high-performance thin-layer chromatography–dual wavelength method for simultaneous determination of mometasone furoate and salicylic acid in complex matrix using analytical eco-scale

A stability-indicating validated high-performance thin-layer chromatography method was performed for the determination of mometasone furoate (MM) and salicylic acid (SLY), simultaneously within the concentration range of 0.1–1.6 μg/band for MM and 0.4–5 μg/band for SLY. This method was developed to assay the investigated drugs in the presence of their degradation products by alkaline, acidic, neutral, photolytic, and oxidative degradation. Separation was achieved using dual wavelength system, 250 nm for MM and 300 nm for SLY, with mobile phase composed of chloroform–ethanol (9:1, %v/v) and stationary phase of aluminum plates pre-coated with silica gel 60 F₂₄₅. The proposed method is well used for the assay and separation of MM and SLY in pure form and Elicasal^® ointment. The developed method has many advantages such as being rapid, selective and inexpensive. Such advantages promote the suggested method for the high throughput assay of MM and SLY mixture, in pure form and topical preparation. The developed method was validated according to the International Council for Harmonisation guidelines, in terms of linearity, limits of detection and quantification, precision, accuracy, robustness, and specificity. Assessment of greenness has been performed depending on analytical eco-scale approach.