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L-乳酸脱氢酶能够催化NAD⁺氧化L-乳酸生成丙酮酸。丙酮酸进一步与2,4-二硝基苯肼反应生成丙酮酸二硝基苯腙,该产物在碱性溶液中呈棕红色,且在450 nm处具有特征吸收峰。通过测定该波长下吸光度的变化,即可定量表征L-乳酸脱氢酶的活性。
L-Lactate dehydrogenase (L-LDH) catalyzes the oxidation of L-lactate by NAD⁺ to generate pyruvate. The pyruvate further reacts with 2,4-dinitrophenylhydrazine (DNPH) to form pyruvate dinitrophenylhydrazone, which appears brownish-red in alkaline solution and exhibits a characteristic absorbance peak at 450 nm. By measuring the change in absorbance at this wavelength, the activity of L-lactate dehydrogenase can be quantitatively determined.