酮酸
酮酸（英语：Keto acid）是一类在生物体内拥有重要作用的有机酸，在氨基酸新陈代谢和维持氧化还原状态的过程中它起一个中心作用。酮酸分两种：
- α-酮酸含有氨基酸的碳结构骨架。
- β-酮酸是高能量的（不稳定的）代谢物，它可以失去羧基同时释放能量促进其它反应进行（脱羧）。
Keto acid
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Keto acid 酮酸
Keto acids or ketoacids (also called oxo acids or oxoacids) are organic compounds that contain a carboxylic acid group and a ketone group. In several cases, the keto group is hydrated. The alpha-keto acids are especially important in biology as they are involved in the Krebs citric acid cycle and in glycolysis.