Abstract:
Analysis of Riboflavin and its derivertives (Flavin mononucleotide and Flavin adenine nucleotide), and B-agonist (Clenbuterol and Salbutamol) by Salbutamol) by cajpillary electrophoresis with UV detector was studied. For Riboflavin and its derivertives, the optimized conditions were 25 mM borate buffer (pH8.5), separation temperature of 35 ํC ,seperation volage of 10kV, and injection time of 7 seconds at mbar. Analytes were detected at 267 nm. Uncoated fused-silica having a total length of 45 cm was used in the experiments. The limits of detection and quantitation were in the range 0.2 to 0.5 ppm, and 0.5 to 0.8 ppm, respectively. Linearity was in the range 0.5 to 50.0 ppm for Riboflavin, and 0.8 to 20.0 ppm for Flavin mononucleotide and Flavin adenine dinucleotide. The percent recoveries of analytes were in the range 94.5 to 109.1. In the beer samples, only Riboflavin and Flavin mononucleotide were found. For Clenbuterol and Salbutamol, the optimized conditions were 10 mM phosphate buffer (pH9.5), separation temperature of 25 ํC, seperation voltage of 10 kV, and injection time of 5 seconds at 50 mbar, Clenbuterol and Salbutamol were detected at 205 nm. Uncoated fused-silica having a total length of 34 cm was used in the experiments. The limits of detection of Clenbuterol and Salbutamol was 0.05 ppm. The limits of quantitation of Clenbuterol and Salbutamol were 0.1 ppm, and 0.2 ppm, respectively. Linearity was in range 0.5 to 10.0 ppm. The percent recoveries of analytes were in the range 64.5-109.1. In pork samples, the amount of Clenbuterol and Salbutamol per gram sample were 0.2 ug and 0.3 ug, respectively. The solid phase extraction containing C-18 (500 mg) was used to preconcentrate all analytes, and a suitable eluent was 7 ml of pure methanol.