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DETERMINATION OF BETA2-AGONISTS IN BOVINE URINE: COMPARISON OF TWO EXTRACTION/CLEAN-UP PROCEDURES FOR HIGH-RESOLUTION GAS CHROMATOGRAPHY-MASS SPECTROMETRY ANALYSIS
Bovinos
Cromatografia Gasosa-Espectrometria de Massas
Estrutura Molecular
Cattle
Gas Chromatography-Mass Spectrometry
Molecular Structure
Receptores adrenérgicos
Bovinos
Cromatografia Gasosa-Espectrometria de Massas
Estrutura Molecular
Química Analítica
Autor
Afiliación
Fundação Oswaldo Cruz. Instituto Nacional de Controle de Qualidade em Saúde. Departamento de Química. Rio de Janeiro, RJ, Brasil.
Universidade Federal do Rio de Janeiro. Instituto de Química. Rio de Janeiro, RJ, Brasil.
Universidade Federal do Rio de Janeiro. Instituto de Química. Rio de Janeiro, RJ, Brasil.
Universidade Federal do Rio de Janeiro. Instituto de Química. Rio de Janeiro, RJ, Brasil.
Universidade Federal do Rio de Janeiro. Instituto de Química. Rio de Janeiro, RJ, Brasil.
Universidade Federal do Rio de Janeiro. Instituto de Química. Rio de Janeiro, RJ, Brasil.
Universidade Federal do Rio de Janeiro. Instituto de Química. Rio de Janeiro, RJ, Brasil.
Resumen en ingles
Two extraction/clean-up analytical procedures were investigated and compared regarding their recovery and matrix-purification efficiency for screening beta2-agonist residues in fortified bovine urine by high-resolution gas chromatography-mass spectrometry (GC-MS). The first procedure, based on an analytical method originally developed for detecting anabolic steroids, consists of the employment of the nonionic resin, Amberlite XAD-2, a styrene-divinylbenzene copolymer for solid-phase extraction (SPE), followed by liquid-liquid extraction with diethyl ether. The second focuses on the use of a mixed SPE cartridge (reversed-phase and ion-exchange sorbent, Bond Elut Certify). In both cases, the trimethylsilylated derivatives were analyzed by GC-MS with an ion-trap detector. Clenbuterol, salbutamol, and terbutaline were used to spike urine samples during the comparison experimental phase. Afterwards, tulobuterol, mabuterol, mapenterol, cimbuterol, and brombuterol were included in the evaluation of the second procedure (the Bond Elut Certify procedure). At this stage, the detection was accomplished by GC-MS (quadrupole mass analyzer) with selective ion monitoring acquisition. The isotopic dilution method with the hexadeuterated analogues of clenbuterol and salbutamol was applied to prepare calibration curves and calculate recovery percentages. With XAD-2 resin, terbutaline and salbutamol (resorcinol and phenol-type beta2-agonists, respectively) could not be detected at 20 ng/mL or at 40 ng/mL. In spite of clenbuterol having been detected at 20 ng/mL, the results obtained were not reproducible. The use of the reversed-phase and ion-exchange sorbent Bond Elut Certify allowed multiresidue detection and showed several advantages for the screening of clenbuterol such as higher recoveries, cleaner final extracts, reduced sample preparation time, less labor intensive, and easier solvent consumption and disposal. Recoveries over 88% (concentrations ranging from 0.5 to 10 ppb) and limits of detection equal to 0.5 ppb were met for all the beta2-agonists studied with the last method.
Palabras clave en portugues
Agonistas Adrenérgicos betaBovinos
Cromatografia Gasosa-Espectrometria de Massas
Estrutura Molecular
Palabras clave en ingles
Adrenergic beta-AgonistsCattle
Gas Chromatography-Mass Spectrometry
Molecular Structure
DeCS
Agonistas Adrenérgicos betaReceptores adrenérgicos
Bovinos
Cromatografia Gasosa-Espectrometria de Massas
Estrutura Molecular
Química Analítica
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