Determination of the residue levels of nicarbazin and combination nicarbazin-narasin in broiler chickens after oral administration

A rapid, simple and highly efficient analytical method for the targeted determination of trimethoprim and sulfamethoxazole in serum samples has been developed and used to measure the pharmacokinetic curve of these medicinal substances after administration to chicken broilers. The pharmacokinetics properties of trimethoprim and sulfamethoxazole were investigated in clinically healthy broiler chickens after the single oral administration of the commercial preparation Methoxasol (Eurovet Animal Health, B.V., The Netherlands) at a dose of 0.275 ml/kg b.w. After a single dose drug administration, the chickens were sacrificed by decapitation under general anaesthesia by Isoflurin 1 000 mg/g (Vetpharma AH, Spain) and the blood was collected at precisely defined intervals: 15, 30, 45, 60, 90, 120, 180, 360 and 720 min after the administration. The serum concentrations of amoxicillin were determined using Q Exactive tandem mass spectrometer (Thermo Fisher Scientific, USA) in conjunction with liquid chromatography. The detected pharmacokinetic parameters of trimethoprim after the oral administration were Cmax = 2.1 ± 1.0 µg/ml; Tmax = 1.5 h; t½ = 0.88 h; kel = 0.009 3 ± 0.001 1 1/h; AUCt = 2.901 ± 1.4 µg.h/ml; AUC∞ = 2.907 ± 1.5 µg.h/ml; Vd = 2.632 l/kg; Cl = 2.7 l/h. The pharmacokinetic parameters of sulfamethoxazole after the oral administration were Cmax = 47.1 ± 15.3 µg/ml; Tmax = 1 h; t½ = 1.92 h; kel = 0.004 6 ± 0.000 3 1/h; AUCt = 89.676 ± 26.9 µg.h/ml; AUC∞ = 94.612 ± 28.4 µg.h/ml; Vd = 0.584 l/kg; Cl = 0.21 l/h. To the best of our knowledge, this is the first pharmacokinetic study of the combination of sulfamethoxazole and trimethoprim in broiler chickens.

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LC-MS/MS analysis of doxycycline residues in chicken tissues after oral administration

Bulletin of the Veterinary Institute in Pulawy ◽

10.2478/bvip-2014-0089 ◽

2014 ◽

Vol 58 (4) ◽

pp. 573-579 ◽

Cited By ~ 9

Author(s):

Anna Gajda ◽

Andrzej Posyniak ◽

Grzegorz Tomczyk

Keyword(s):

Oral Administration ◽

Broiler Chickens ◽

Thigh Muscle ◽

Limit Of Quantification ◽

Limit Values ◽

Chicken Tissues ◽

Short Period ◽

Liquid Chromatography Tandem Mass ◽

Liver And Kidney

Abstract For the purpose of quantitative determination of doxycycline (DC) residues in tissues, a sensitive liquid chromatography - tandem mass spectrometry (LC-MS/MS) method was developed. The method was used to determine DC residues in chicken tissues (breast and thigh muscle, liver and kidney) after oral administration with drinking water to five-weak-old broiler chickens. The DC was administered for five consecutive days at a therapeutic dose of 10 mg/kg b.w. once a day. The tissues were collected after 6 h, 24 h, 7 d, and 8 d. The method was validated and the decision limit was established for muscle - 109.2 μg/kg, for liver - 326.1 μg/kg, and for kidney - 634.0 μg/kg. The detection limit was 2 μg/kg and the limit of quantification was 5 μg/kg. In a short period after ceasing the treatment, the detected concentrations of DC were much higher than the established maximum residue limit values. The highest residue concentrations of DC were observed in the kidney, followed by the liver and muscle. The lowest concentration of DC was determined in tight muscle.

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Simultaneous Determination of Imatinib and N-Desmethyl Imatinib in Rat Plasma and Tissues Using LC-MS/MS

Current Pharmaceutical Analysis ◽

10.2174/1573412913666170821124952 ◽

2019 ◽

Vol 15 (2) ◽

pp. 121-129

Author(s):

Zhi Rao ◽

Bo-xia Li ◽

Yong-Wen Jin ◽

Wen-Kou ◽

Yan-rong Ma ◽

...

Keyword(s):

Bone Marrow ◽

Oral Administration ◽

Parent Drug ◽

Gradient Elution ◽

Biological Tissues ◽

Rat Plasma ◽

Running Water ◽

Liver And Kidney ◽

The Brain

Background: Imatinib (IM) is a chemotherapy medication metabolized by CYP3A4 to Ndesmethyl imatinib (NDI), which shows similar pharmacologic activity to the parent drug. Although methods for determination of IM and/or NDI have been developed extensively, only few observations have been addressed to simultaneously determine IM and NDI in biological tissues such as liver, kidney, heart, brain and bone marrow. Methods: A validated LC-MS/MS method was developed for the quantitative determination of imatinib (IM) and N-desmethyl imatinib (NDI) from rat plasma, bone marrow, brain, heart, liver and kidney. The plasma samples were prepared by protein precipitation, and then the separation of the analytes was achieved using an Agilent Zorbax Eclipse Plus C18 column (4.6 × 100 mm, 3.5 µm) with gradient elution running water (A) and methanol (B). Mass spectrometric detection was achieved by a triplequadrupole mass spectrometer equipped with an electrospray source interface in positive ionization mode. Results: This method was used to investigate the pharmacokinetics and the tissue distributions in rats following oral administration of 25 mg/kg of IM. The pharmacokinetic profiles suggested that IM and NDI are disappeared faster in rats than human, and the tissue distribution results showed that IM and NDI had good tissue penetration and distribution, except for the brain. This is the first report about the large penetrations of IM and NDI in rat bone marrow. Conclusion: The method demonstrated good sensitivity, accuracy, precision and recovery in assays of IM and NDI in rats. The described assay was successfully applied for the evaluation of pharmacokinetics and distribution in the brain, heart, liver, kidney and bone marrow of IM and NDI after a single oral administration of IM to rats.

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