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This work describes the development and validation of a quantitative and confirmatory method to determination of nine fluoroquinolones residues in poultry, bovine, swine and fish muscle using LC-MS/MS. Sample preparation was based in a fast solvent extraction with acetonitrile with 1% of formic acid followed by a low-temperature clean up procedure and centrifugation, without further steps. The recoveries...
Grapefruit juice increases blood concentrations of some dihydropyridine calcium-channel blockers, which are metabolised by the P450 enzymes that also metabolise cyclosporin. We evaluated, in a randomised cross-over study, the effect of grapefruit juice on blood cyclosporin concentrations in 14 healthy adults. Each subject was given oral cyclosporin 300 mg with 250 mL grapefruit juice, orange juice,...
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