Occurrence of antimicrobial residues in tilapia (Oreochromis niloticus) fillets produced in Brazil and available at the retail market.

This study was carried out to assess the occurrence of antimicrobial residues in samples of tilapia (Oreochromis niloticus) fillets collected at the State of São Paulo retail market and produced from fish farmed in Brazil. For this purpose, a liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS) method was validated and used to quantify residues of 25 antibacterial drugs (2 β-lactams, 8 quinolones, 2 macrolides, 5 sulfonamides, 4 tetracyclines, 3 amphenicols and 1 sulfonamide potentiator). For the sample preparation step the QuEChERS approach was performed.

Polyether ionophores residues in Minas Frescal cheese by UHPLC-MS/MS.

An analytical method was developed and validated for the determination of three polyether ionophores (monensin, lasalocid, and salinomycin) in 60 samples of Brazilian Minas Frescal cheese by UHPLC-MS/MS. Linearity ranged from 1 to 8 μg kg for monensin and salinomycin, and from 0.50 to 4 μg kg for lasalocid.

A simple and high-throughput method for multiresidue and multiclass quantitation of antimicrobials in pangasius (Pangasionodon hypophthalmus) fillet by liquid chromatography coupled with tandem mass spectrometry.

The development and validation of a throughput method for the determination of 25 antibacterial drugs (two β-lactams, eight quinolones, two macrolides, five sulfonamides, trimethoprim, four tetracyclines and three amphenicols) in pangasius fish muscle by LC-MS/MS were performed. A simple, efficient and fast extraction procedure was developed using acetonitrile and a 0.1 M EDTA solution as solvents for extraction.