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Which protease is being used to ‘shrink-proof’ wool’?

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Which protease is being used to ‘shrink-proof’ wool’?

(a) Pancreatic enzyme

(b) Rennet

(c) Fungal protease

(d) Papain

This question was addressed to me in exam.

The question is from Large Scale Use of Enzyme in portion Large Scale Use of Enzyme in Solution of Enzyme Technology

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Correct answer is (d) Papain

The explanation is: Papain is used to ‘shrink-proof’ wool in the wool industry. The shrinkage due to movement of wool fibers only in one direction (away from the tip rather than towards it) which is because of overlapping scales pointing towards the fiber tip. This is eliminated by use of papain which involves partially hydrolysis scale tips. This method also gave the wool a silky lustre an added to its value.

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