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Question
Explain the following:
Browning of cut apple can be prolonged by applying lemon juice.
Short Note
Solution
- Browning of cut apple is due to the oxidation of polyphenols at a particular pH to quinones, which further undergoes polymerization to form brown coloured tannins.
- This browning reaction can be prolonged or slowed down by using reducing agents or by changing the pH.
- Applying lemon juice (i.e., citric acid) on the cut apple, lowers the pH at the surface of the apple. This prevents the oxidation reaction. Thus, browning of cut apple can be prolonged by applying lemon juice.
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Basics of Food Chemistry
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