Разработка и валидация методики определения амитраза и его метаболитов в мёде методом ВЭЖХ–МС/МС
Аннотация
Разработали и валидировали селективную, простую в реализации, экспрессную методику совместного определения в мёде остаточного содержания инсектицида амитраз и трех его метаболитов (ДМФФ, ДМФ и ДМА). Методика основана на жидкость-жидкостной экстракции аналитов дихлорметаном из водного раствора мёда, подщелоченного аммиаком для улучшения стабильности лабильного в кислой среде инсектицида в процессе пробоподготовки. Получаемые экстракты достаточно чистые и не требуют дополнительной очистки с использованием твердофазной экстракции либо ее вариантов. Выбор экстрагента основан на предварительном изучении распределения амитраза, ДМФФ, ДМФ и ДМА в экстракционных системах вода – органический растворитель (н-гексан, толуол, дихлорметан, хлороформ). Количественное определение осуществляется методом ВЭЖХ–МС/МС в режиме мониторинга множественных реакций с использованием матричной градуировки в диапазоне массовой доли аналитов в мёде от 25 до 250 мкг/кг. Значения предела обнаружения в зависимости от аналита составляют от 0.2 до 2.3 мкг/кг, предела определения – от 0.6 до 4.6 мкг/кг, относительного стандартного отклонения повторяемости – от 1.4 до 5.8 %, относительного стандартного отклонения промежуточной прецизионности – от 1.4 до 7.7 %, относительной расширенной неопределенности – от 9 до 22 %. Градуировочные графики линейны в диапазоне массовой доли аналитов в мёде от 25 до 250 мкг/кг. Также в процессе валидации оценили инструментальные пределы обнаружения и определения, матричный эффект, степень извлечения, общую эффективность процесса, смещение.
Ключевые слова: амитраз, метаболиты, жидкость-жидкостная экстракция, ВЭЖХ–МС/МС, мёд.
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DOI: https://doi.org/10.15826/analitika.2023.27.3.006
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