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Charles University in Prague Faculty of Pharmacy in Hradec Králové Department of Analytical Chemistry Consultant: doc. RNDr. Miroslav Polášek, CSc. Diploma Thesis Title: Determination of pefloxacin mesylate dihydrate using sequential injection analysis with chemiluminescent detection A simple and rapid method for determination of pefloxacin mesylate dihydrate (PEF) using sequential injection analysis with chemiluminescent detection was devised and optimised. Chemiluminescent reaction was based on redox reaction of tris(2,2′- bipyridine)dichlororuthenium(II) hexahydrate. Ammonium cerium(IV) sulfate was used as an oxidant. Sodium acetate was used as a third component which had enhancing effect on CL reaction. The calibration curve was linear in the range 5,2* 10-07 - 1,29* 10-05 M of PEF, R2= 0,9948. The limit of detection (LOD) was 0,21 μM and the limit of quantification (LOQ) was 0,28 μM. This optimised method was used for the determination of PEF in ABAKTAL inj. sol. Interferences from some excipients (EDTA, ascorbic acid and sodium metabisulfite) used in the production of injection solutions were examined.