Flashcard Study
Natural Food Colours — Card 23 of 33
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Question
Which flavonoid pigment is most unstable at alkaline pH?
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Answer
C. Anthocyanin
Anthocyanins are highly sensitive to pH changes. At alkaline pH, their chemical structure changes, resulting in color fading or conversion to blue/green pigments.
Anthocyanin color changes:
Acidic → Red
Neutral → Purple
Alkaline → Blue/green
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