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Published on: May 10, 2018
Development of a multicommutated flow system with chemiluminometric detection for quantification of gentamicin in
Lúcia H M L M Santos1, A N Araújo, Boaventura Reis
1REQUIMTE, Department of Chemistry, Faculty of Pharmacy, University of Porto, Rua Anibal Cunha 164, 4050-047 Porto, Portugal.
Abstract:
A new flow procedure based on multicommutation with chemiluminometric detection was developed to quantify gentamicin sulphate in pharmaceutical formulations. This approach is based on gentamicin's ability to inhibit the chemiluminometric reaction between luminol and hypochlorite in alkaline medium, causing a decrease in the analytical signal. The inhibition of the analytical signal is proportional to the concentration of gentamicin sulphate, within a linear range of 1 to 4 μg mL(-1) with a coefficient variation <3%. A sample throughput of 55 samples h(-1) was obtained. The developed method is sensitive, simple, with low reagent consumption, reproducible, and inexpensive, and when applied to the analysis of pharmaceutical formulations (eye drops and injections) it gave results with RSD between 1.10 and 4.40%.

