Вольтамперометрический способ определения судана I для контроля качества пищевых продуктов

Судан I является синтетическим азокрасителем, запрещенным к применению в пищевой промышленности. В целях контроля качества и безопасности пищевых продуктов необходимы простые и экспрессные способы его определения. Предложен вольтамперометрический подход, основанный на окислении судана I на стеклоуглеродном электроде (СУЭ), модифицированном диспергированными в гексадецилпиридиний бромиде наностержнями диоксида марганца (НС MnO₂). Для модифицированного электрода показано 7.9- и 9.2-кратное увеличение электроактивной площади поверхности и скорости переноса электрона соответственно по сравнению с СУЭ, что подтверждает эффективность использования НС MnO₂ в качестве модификатора. Установлено, что необратимое электроокисление судана I сопровождается переносом протонов и контролируется как диффузией, так и поверхностными процессами. Для аналитических целей использован дифференциально-импульсный режим вольтамперометрии в среде фосфатного буферного раствора рН 6.5. Показана линейность отклика электрода на судан I в диапазонах 0.050–2.5 и 2.5–25 мкМ. Предел обнаружения составляет 13.5 нМ. Предложенный подход апробирован в анализе пищевых продуктов (сушеная и копченая паприка и семга). Значения степени открытия (99–101%) подтверждают отсутствие матричных эффектов и практическую применимость метода.

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