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Clenbuterol Storage Stability in the Bovine Urine and Liver Samples Used for Eu...
Pinheiro, Isabel; Jesuíno, Bruno; Barbosa, Jorge; Ferreira, Humberto; Ramos, Fernando; Matos, José; Silveira, Maria Irene Noronha daClenbuterol is a well-known growth promoter, illegally used in farm animals, especially in cattle. Samples collected for the screening of β2-agonist residues in Portuguese Azores Islands must travel through all the nine islands until they reach Azores Central Laboratory. If any suspicious sample is detected, it must be further transported to the National Reference Laboratory in Lisbon for confirmation. As a con...
Determination of nitrofurans in animal feeds by liquid chromatography-UV photod...
Barbosa, Jorge; Moura, Sara; Barbosa, Rita; Ramos, Fernando; Silveira, Maria Irene Noronha daWithin the EU, the use of nitrofurans is prohibited in food production animals. For this reason detection of these compounds in feedingstuffs, at whatever limit, constitutes an offence under EU legislation. This detection generally involves the use of analytical methods with limits of quantification lowers than 1 mg kg-1. These procedures are unsuitable for the detection and confirmation of trace amounts of nit...
Control of the illegal use of clenbuterol in bovine production
Cristino, Assunção; Ramos, Fernando; Silveira, Maria Irene Noronha daThis study is based on a plan of collecting different matrices (hair, eye, muscle, liver and kidney) in order to define a strategy for the control of the illegal use of clenbuterol in bovine production. Of all matrices utilised, hair is recommended for the analytical control of clenbuterol in living animals, due to its being permanently available and easy to collect. The eye, or rather the retina, is the matrix...
Methods for the determination of organochlorine pesticide residues in human serum
Lino, Celeste Matos; Azzolini, Clara B. Ferreira; Nunes, Domingos S. Valente; Silva, José M. Rocha; Silveira, Maria Irene Noronha daThe effectiveness of solid-phase extraction with Florisil for the determination of 12 organochlorine pesticide residues from human serum was examined. Recoveries greater than 84% and coefficients of variation better than 19% were obtained. Others methods, such as column partition and matrix solid-phase dispersion, were compared. The better method provides quantification limits ranging from 1.08 [mu]g/l for [gam...
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