В. Ферментативное определение глюкозы

Большинство биомолекул не поглощают свет в видимой или ультрафиолетовой областях спектра. Кроме того, они обычно присутствуют в смеси с другими соединениями, которые также дают аналогичные химические реакции. Обе трудности можно преодолеть с помощью подходящего фермента для избирательного превращения определяемого метаболита в окрашенное вещество, которое далее определяют по интенсивности поглощения света.

Обычный метод определения глюкозы в крови (см. Сахарный диабет) основан на двух последовательных реакциях: 1) образование глюконолактона и пероксида водорода H2O2 под действием фермента глюкозооксидазы, 2) окисление бесцветного вещества пероксидом водорода в окрашенное зелёное соединение в реакции, катализируемой пероксидазой. Когда вся имеющаяся в пробе глюкоза израсходована, количество образованного окрашенного вещества можно определить по светопоглощению, которое прямо пропорционально первоначальному содержанию глюкозы.


Метаболизм. Ферменты / Ферментативный анализ

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