Discussion
Arrange the steps of extracting pectin from citrus peel in order:
1. Precipitate the pectin with alcohol
2. Wash and dry the peel
3. Dry and mill the recovered pectin
4. Extract with hot dilute acid
Select the correct sequence.
Answer: A
Correct answer: 2, 4, 1, 3
The peel is first washed and dried (2), removing sugars and other solubles that would otherwise contaminate the product. It is then extracted with hot dilute acid (4), which hydrolyses the protopectin holding the pectin in the cell wall and brings it into solution.
The pectin is precipitated from that solution with alcohol (1), since it is insoluble in alcohol while the impurities remain dissolved, and the precipitate is finally dried and milled (3) to a standardised powder.
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