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1

This is specific to navel oranges, which have a conjoined twin fruit. This blog gives an account of this.


6

The reason for this is the oxidation of phenol residues in the banana (for example in the yellow color) which get oxidized by the enzyme Polyphenol oxidase (PPO) to melanins. The scheme (the image is from this website on food browning) looks like this (you can of course also use more complicated substrates): For further information, see these references: ...



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