果酸

Methods The water-solution containing citric acid ( CA) and malic acid ( MAw) as quantitively added into calcium carbonate emulsion slowly and homogeneously group by group for tow reactions at a special temperature.

方法柠檬酸、苹果酸配成水溶液，定量分批均匀缓慢加入到碳酸钙乳液中，在特定温度下反应2次，冷冻结晶，干燥机烘干，制成柠檬酸-苹果酸复合钙盐钙营养强化剂。

The major organic acids in tea root exudates were malic and oxalic acid, but malic, oxalic acid, pyruvic acid, ascorbic acid and a-ketoglutaric acid in tea leaf.

茶树体内可检测到的有机酸主要有草酸、丙酮酸、苹果酸、抗坏血酸、α-酮戊二酸和琥珀酸，而茶树根系分泌物中有机酸主要为草酸和苹果酸。

Malate dehydrogenase ( EC 1.1.1.37, MDH) is one of the key enzymes in TCA cycle, it reversibly catalyzes the convertion of malic acid and oxaloacetate.

苹果酸脱氢酶（EC1.1.1.37，MDH）是生物体三羧酸循环（TCA）的关键酶之一，它在柠檬酸循环中催化苹果酸形成草酰乙酸，也可以催化草酰乙酸形成苹果酸。