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ME广泛存在于微生物、培养细胞、动物和植物胞浆中，尤其在植物组织中活性较高。ME催化苹果酸氧化脱羧的可逆反应，产生丙酮酸和CO2，以及伴随NAD(P)+的还原反应，是苹果酸代谢的关键酶。ME活性与生物合成和抗氧化密切相关。近年来植物ME活性测定较多，已经成为抗氧化研究的热点。根据辅酶专一性和对底物特异性的不同，可将ME分为NAD-ME(EC1.1.1.38)和NADP-ME(EC1.1.1.40)。 测定原理：NADP-ME催化NADP⁺还原成NADPH，在340nm下测定NADPH增加速率。
ME is widely present in the cytoplasm of microorganisms, cultured cells, animals, and plants, with particularly high activity in plant tissues. ME catalyzes the reversible oxidative decarboxylation of malate to produce pyruvate and CO₂, accompanied by the reduction of NAD(P)⁺, and is a key enzyme in malate metabolism. ME activity is closely associated with biosynthesis and antioxidant processes. In recent years, the determination of ME activity in plants has gained significant attention and has become a hotspot in antioxidant research. Based on coenzyme specificity and substrate specificity, ME can be classified into NAD-ME (EC 1.1.1.38) and NADP-ME (EC 1.1.1.40). Determination Principle: NADP-ME catalyzes the reduction of NADP⁺ to NADPH, and the rate of NADPH increase is measured at 340 nm.
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