Excellent green analysis for quantification of gatifloxacin in eye drops by Eco-Scale Assessment

Abstract

Gatifloxacin (GAT), a fourth-generation fluoroquinolone, is currently marketed primarily in the form of eye drops. The literature shows physical-chemical methods with a predominance of the use of toxic organic solvents, which promote the generation of potentially harmful residues both for the environment and for the operator. The objective was to develop and validate an excellent green method in the visible region for quantification of GAT in eye drops. Purified water and NaOH 0.1 M, as a diluent, and phenolphthalein 1 %, for reaction, at 552 nm were used. The method was linear in the range of 7-12 μg/mL (0.9996), precise (relative standard deviation < 5 %), selective through sample adjuvants, exact (mean recovery of 100.88 %) and robust against changes in wavelength and microplate usage. The content obtained with the proposed method was 98.21 % and is in agreement with the official compendium and other methods described in the literature. The method is a green proposal to quantify GAT in eye drops according to the Eco-Scale Assessment tool.