why do avocados go black when left outside?

Question

why do avocados go black when left outside?

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Answer 1

Avocados, along with many other fruits, produce an enzyme called polyphenol oxidase. When exposed to atmospheric oxygen after being cut open, this enzyme reacts and oxidizes polyphenols, a micronutrient found in plants. The oxidized polyphenols are a dark brown color. There is nothing spoiled or dangerous about that color, and both the texture & flavor are unaffected.