柠檬酸
柠檬酸，化学式为 C6H8O7（英语：Citric Acid，也称为枸橼酸），渠包括3个羧基（R-COOH）基团。是一种中强度有机酸，自然中勒柑橘类水果中产生个一种天然防腐剂，也是食物搭饮料中个酸味添加剂。
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