Discussion
Assertion (A): Rice bran must be stabilised within hours of milling.
Reason (R): Lipase brought into contact with the oil at milling raises free fatty acids rapidly.
Select the correct answer from the options below.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both statements are true and the reason is the mechanism. Milling ruptures the bran cells and brings lipase into contact with the oil it was previously separated from.
The enzyme hydrolyses the oil into free fatty acids at several per cent a day, and once that content passes a few per cent the oil is no longer fit for edible use and its value collapses. Stabilisation by extrusion or steam heating denatures the lipase, and it must follow milling within hours rather than days.
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