The actions of iodine and hypoiodous acid on pepsin

Abstract
Iodine or hypoiodous acid destroyed the activity of pepsin with little or no diminution in the colour given with Folin''s phenol reagent. It is therefore probable that other groups besides tyrosine were essential for peptic activity and reacted with iodine. The groups in question are unlikely to be any of the known amino-acids.

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