why does cut apple turn brown?

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why does cut apple turn brown? by Mind Map: why does cut apple turn brown?

1. Apple contain polyphenol oxidase enzymes (PPO) in the chloplast.

2. When the apple is cut,PPO will receive a lot of oxygen

3. Thus the PPO will rapidly oxidize phenolic compounds naturally present in the apple tissues to o-quinones.

4. O-quinones then produce the well documented brown colour by reacting to form compounds with amino acids or proteins or they self-assemble to male polymers.