Assertion: purified collagen | /r/CapableOf | involve alkaline hydrolysis
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text: The air bladder is an accessory respiratory organ used for real respiration.28 Fish collagen, which is also called Piscean collagen, is a protein extracted from fish waste, including the scales, skin, or air bladders; it is predominantly sourced from fresh water carp, Labeo rohita.29 Purifying collagen from fish involves alkaline hydrolysis, returning the collagen to a neutral pH, and subjecting it to acid hydrolysis to stabilize it.