Salinomycin (Sigma-Aldrich S4526 PtyLtd., Darmstadt, Germany), streptomycin (Sigma-Aldrich S6501), tylosin (Sigma-Aldrich T6134), chlortetracycline (Sigma-Aldrich C4881), ciprofloxacin (Sigma-Aldrich 17850), and sulphamethazine (Sigma-Aldrich S6256).
The concentrations of the antibiotic standard solutions were prepared as follows: Salinomycin (50 µg·L−1, 100 µg·L−1, 50 µg·L−1), streptomycin (2000 µg·L−1), tylosin (1000 µg·L−1), chlortetracycline (200 µg·L−1), ciprofloxacin (100 µg·L−1), sulphamethazine (1000 µg·L−1). The preparation and storage of the standard solutions was in accordance with the procedure of the methods used.
The concentrations of the antibiotic standard solutions were prepared as follows: Salinomycin (50 µg·L−1, 100 µg·L−1, 50 µg·L−1), streptomycin (2000 µg·L−1), tylosin (1000 µg·L−1), chlortetracycline (200 µg·L−1), ciprofloxacin (100 µg·L−1), sulphamethazine (1000 µg·L−1). The preparation and storage of the standard solutions was in accordance with the procedure of the methods used.