Simplified determining procedure for routine residue monitoring of sulphamethazine and sulphadimethoxine in milk.
A simplified determining/identifying method for residual sulphamethazine (SMZ) and sulphadimethoxine (SDM) in milk by using a high-performance liquid chromatography (HPLC) with a photo-diode array detector was presented. Both sulphonamides in cow's milk samples were extracted by only stirring with ethanol followed by an Ultrafree-MC/Biomax as a centrifugal ultra-filtration unit. For determination/identification of SMZ and SDM, a Mightysil RP-18 GP Aqua column and a mobile phase of 25% (v/v) ethanol solution (in water) with a photo-diode array detector was used. Average recoveries from spiked SMZ and SDM (10-1000 ng/ml each drug) were > or = 83% with the relative standard deviations between 1.4 and 3.7%. The limit of quantitation (LOQ) were calculated to be 5 ng/ml for SMZ and 10 ng/ml for SDM, respectively. The values were below the MRL/tolerance (SMZ, 25 ng/ml; SDM, 10 ng/ml). The total time and solvent required for the analysis of one sample were <35 min and <2 ml of only ethanol, respectively. No toxic solvents were used. The developed procedure was harmless to the human and environment.
Furusawa
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Faculty of Human Life Science, Osaka City University, Japan. furusawa@life.osaka-cu.ac.jp
D000818:Animals; D002138:Calibration; D002417:Cattle; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D004350:Drug Residues / Q000032:analysis; D008892:Milk / Q000737:chemistry*; D012015:Reference Standards; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet; D013412:Sulfadimethoxine / Q000032:analysis*; D013418:Sulfamethazine / Q000032:analysis*
D013412:Sulfadimethoxine; D013418:Sulfamethazine