GATE 2021 BM – Question 35
A polymer scaffold for cartilage tissue engineering has initial dry mass 20 mg. After seven days in lysozyme solution it is freeze-dried and has dry mass 18 mg. Find percentage degradation.
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Correct answer: 10 to 10
Explanation
Degradation by dry mass loss is (initial−final)/initial×100. The lost mass is 20−18=2 mg, so the fraction lost is 2/20=.1. Percentage degradation is ten percent. Freeze-drying removes water uptake from the mass comparison.