When oxygen is present in cells, polyphenol oxidase (PPO) enzymes in the chloroplasts rapidly oxidize phenolic compounds naturally present in the apple tissues to o-quinones, colorless precursors to brown-colored secondary products.
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- 当氧存在于苹果组织的细胞中时,叶绿体(含有叶绿素和进行光合作用的地方)中的多酚氧化酶,会迅速地将天然存在于苹果组织中的酚类化合物氧化为邻醌。