Mostafa Islam M, Omar Mahmoud A, Elsayed Mohamed Ahmed, Mohamed Abobakr A
Analytical Chemistry Department, Faculty of Pharmacy, Minia University, Minya, Egypt.
Analytical Chemistry Department, Faculty of Pharmacy, Minia National University, New Minya, Egypt.
Luminescence. 2025 Mar;40(3):e70154. doi: 10.1002/bio.70154.
An innovative and sensitive analytical tool (fluorimetric spectroscopy) for quantifying besifloxacin (BFC) in eye drops and aqueous humor is introduced. The method presented here utilizes a well-known derivatization reaction called Hantzsch reaction to activate BFC's fluorescence. All the factors affecting the sensitivity of the developed approach were optimized to boost the method's sensitivity. After optimizations, this reaction enables the fluorimetric determination (at 485 nm) of BFC in eye drops and spiked aqueous humor without any obstructions from the naturally present biointerferents. The dynamic range for BFC determination in the pure state is 0.15-1.0 (μg/mL), with detection and quantification limits of 0.02 and 0.05 (μg/mL), respectively. The approach exhibits favorable recovery rates in spiked aqueous humor (95.5% ± 1.15%-100.3% ± 0.50%).
