Answer: denaturing

AnswerCrossword Clue
denaturing(of a substance) Undergo this process
denaturingDENATURE, to deprive of natural qualities
denaturingMake (alcohol) unfit for drinking by the addition of toxic or foul-tasting substances
denaturingTake away or alter the natural qualities of
denaturingDestroy the characteristic properties of (a protein or other biological macromolecule) by heat, acidity, or other effects that disrupt its molecular conformation