title: Determination of antibacterial agent tilmicosin in pig plasma by LC/MS/MS and its application to pharmacokinetics.
abstract: A rapid and sensitive high-performance liquid chromatography-tandem mass spectrometry (LC-MS/MS) method was developed and validated to quantify tilmicosin in pig plasma. Plasma samples were prepared by liquid-liquid extraction. Chromatographic separation was achieved on a C18column (2.1 × 30 mm, 3.5 μm) using acetonitrile-water (90:10, v/v; water included 0.1% formic acid) as the mobile phase. Mass detection was carried out using positive electrospray ionization in multiple reaction monitoring mode. The calibration curve was linear from 0.5 to 2000 ng/mL (r2= 0.9998). The intra- and inter-day accuracy and precision were within the acceptable limits of ±10% for all tilmicosin concentrations. The recoveries ranged from 95 to 99% for the three tested concentrations. The LC-MS/MS method described herein was simple, fast and less laborious than other methods, achieved high sensitivity using a small sample volume, and was successfully applied to pharmacokinetic studies of tilmicosin enteric granules after oral delivery to pigs. In comparison with tilmicosin premix, tilmicosin enteric granules slowed the elimination rate of tilmicosin, prolonged its period of action and significantly improved its bioavailability.
authors: Key Laboratory of Veterinary Pharmaceutical Development, Ministry of Agriculture, Lanzhou, China.|Key Laboratory of New Animal Drug Project of Gansu Province, Lanzhou, China.|Lanzhou Institute of Husbandry and Pharmaceutical Sciences of CAAS, Lanzhou, China.
authors: Bing
authors: B
authors: Li
authors: China Agricultural Vet. (Tianjin) Biological Medicine Co. Ltd, Tianjin, China.
authors: Shi-Yue
authors: SY
authors: Gong
authors: Key Laboratory of Veterinary Pharmaceutical Development, Ministry of Agriculture, Lanzhou, China.|Key Laboratory of New Animal Drug Project of Gansu Province, Lanzhou, China.|Lanzhou Institute of Husbandry and Pharmaceutical Sciences of CAAS, Lanzhou, China.
authors: Xu-Zheng
authors: XZ
authors: Zhou
authors: Key Laboratory of Veterinary Pharmaceutical Development, Ministry of Agriculture, Lanzhou, China.|Key Laboratory of New Animal Drug Project of Gansu Province, Lanzhou, China.|Lanzhou Institute of Husbandry and Pharmaceutical Sciences of CAAS, Lanzhou, China.
authors: Ya-Jun
authors: YJ
authors: Yang
authors: Key Laboratory of Veterinary Pharmaceutical Development, Ministry of Agriculture, Lanzhou, China.|Key Laboratory of New Animal Drug Project of Gansu Province, Lanzhou, China.|Lanzhou Institute of Husbandry and Pharmaceutical Sciences of CAAS, Lanzhou, China.
authors: Jian-Yong
authors: JY
authors: Li
authors: Key Laboratory of Veterinary Pharmaceutical Development, Ministry of Agriculture, Lanzhou, China.|Key Laboratory of New Animal Drug Project of Gansu Province, Lanzhou, China.|Lanzhou Institute of Husbandry and Pharmaceutical Sciences of CAAS, Lanzhou, China.
authors: Xiao-Juan
authors: XJ
authors: Wei
authors: Key Laboratory of Veterinary Pharmaceutical Development, Ministry of Agriculture, Lanzhou, China.|Key Laboratory of New Animal Drug Project of Gansu Province, Lanzhou, China.|Lanzhou Institute of Husbandry and Pharmaceutical Sciences of CAAS, Lanzhou, China.
authors: Fu-Sheng
authors: FS
authors: Cheng
authors: Key Laboratory of Veterinary Pharmaceutical Development, Ministry of Agriculture, Lanzhou, China.|Key Laboratory of New Animal Drug Project of Gansu Province, Lanzhou, China.|Lanzhou Institute of Husbandry and Pharmaceutical Sciences of CAAS, Lanzhou, China.
authors: Jian-Rong
authors: JR
authors: Niu
authors: Key Laboratory of Veterinary Pharmaceutical Development, Ministry of Agriculture, Lanzhou, China.|Key Laboratory of New Animal Drug Project of Gansu Province, Lanzhou, China.|Lanzhou Institute of Husbandry and Pharmaceutical Sciences of CAAS, Lanzhou, China.
authors: Xi-Wang
authors: XW
authors: Liu
authors: Key Laboratory of Veterinary Pharmaceutical Development, Ministry of Agriculture, Lanzhou, China.|Key Laboratory of New Animal Drug Project of Gansu Province, Lanzhou, China.|Lanzhou Institute of Husbandry and Pharmaceutical Sciences of CAAS, Lanzhou, China.
authors: Ji-Yu
authors: JY
authors: Zhang
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000032:analysis*; D059625:Liquid-Liquid Extraction / Q000379:methods*; D008297:Male; D013552:Swine; D053719:Tandem Mass Spectrometry / Q000379:methods*; D015645:Tylosin / Q000031:analogs & derivatives* / Q000032:analysis
chemical_list: D000900:Anti-Bacterial Agents; C052319:tilmicosin; D015645:Tylosin
keywords: LC/MS/MS; pharmacokinetics; pig plasma; tilmicosin; tilmicosin enteric granules