title: Simultaneous determination of ormethoprim and sulphadimethoxine in plasma and muscle of Atlantic salmon (Salmo salar).
abstract: A rapid clean-up and high-performance liquid chromatographic method for the simultaneous determination of ormethoprim and sulphadimethoxine in plasma and muscle of Atlantic salmon (Salmo salar) has been developed. Sample preparation is based on protein precipitation using trichloroacetic acid or methanol for plasma and muscle, respectively. The drugs are separated using a reversed-phase C18 analytical column and phosphate buffer-acetonitrile (80:20, v/v) containing 1-heptanesodiumsulphonate and triethylamine, as mobile phase. Detection was performed at 270 nm. The average recovery of ormethoprim was 97.2% in muscle and 95.7% in plasma, whereas the average recovery of sulphadimethoxine was 86.5% in muscle and 90.2% in plasma. The limit of detection at a signal-to-noise ratio of 3 was 50 ng/g and 30 ng/ml for ormethoprim in muscle and plasma respectively and 30 ng/g and 15 ng/ml in muscle and plasma respectively for sulphadimethoxine.
authors.affiliation: Institute of Marine Research, Department of Aquaculture, Bergen, Norway.
authors.forename: O B
authors.initials: OB
authors.lastname: Samuelsen
mesh_terms: D000818:Animals; D000890:Anti-Infective Agents / Q000097:blood / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D018482:Muscle, Skeletal / Q000737:chemistry*; D011743:Pyrimidines / Q000097:blood / Q000737:chemistry*; D012474:Salmon / Q000378:metabolism*; D013056:Spectrophotometry, Ultraviolet; D013412:Sulfadimethoxine / Q000097:blood / Q000737:chemistry*; D013420:Sulfamethoxazole / Q000097:blood / Q000737:chemistry
chemical_list: D000890:Anti-Infective Agents; D011743:Pyrimidines; D013412:Sulfadimethoxine; D013420:Sulfamethoxazole; C100125:ormetoprim