Objective of research: Development of methods for the determination of fenbendazole and its metabolites in milk by liquid chromatography coupled with tandem mass spectrometry. Materials and methods: Fenbendazole was administered orally to five cows. Samples of milk were taken on 1, 3, 5 and 10 days of drug application. The research method includes a description of reagents, plates and equipment; mass-spectrometric conditions for analysis of fenbendazole and its metabolites; preparation of the equipment to operation; preparation of eluent solution; preparation of the chromatograph to analysis; determination of chromatographic parameters of standard drug samples; preparation of milk samples to analysis; establishment of parameters of extracts’ chromatography; procedure of calibration of fenbendazole and its metabolites in eluent. Results and discussion: When studying the pharmacokinetics of fenbendazole and its metabolites (sulfone and sulfoxide) in milk, it was found that the maximal concentrations were determined 24 h after drug administration and were 22,6 ng/ml for fenbendazole sulfone, 34,0 ng/ml for fenbendazole sulfoxide and 19,7 ng/ml for fenbendazole. 10 days after treatment, the concentrations of fenbendazole and its metabolites in milk did not exceed permitted values.
milk, fenbendazole, metabolite, sulfoxide, sulfone, pharmacokinetics, liquid chromatography, mass-spectrometry.
Введение
Вигисокс — комплексный антигельминтный препарат с содержанием 8% фенбендазола, 72% никлозамида и вспомогательных веществ. Фенбендазол, входящий в состав препарата, обладает выраженным нематодоцидным и в меньшей степени цестодоцидным и трематодоцидным действиями. Механизм действия его заключается в угнетении фумарат редуктазы, нарушении проницаемости клеточных мембран и нервно-мышечной иннервации, что приводит к гибели гельминта [14, 15]. Установлена высокая эффективность препарата при мониезиозе, диктиокаулезе, стронгилятозах пищеварительного тракта овец, коз и крупного рогатого скота в дозе 60 мг/кг, при трихоцефалезе — 80 мг/кг [1–3].
Для внедрения препарата в ветеринарную практику необходимы сведения по параметрам фармакокинетики и остаточным количествам его действующих веществ в органах и тканях животных, что и явилось целью наших исследований. В связи с тем, что после всасывания фенбендазол быстро метаболизируется в печени до сульфоксида (оксфендазола), обладающего антигельминтным действием, и в дальнейшем до сульфона, то их остаточные количества требуют детекции [8].
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