Abstract
The action of insulin on hemoglobin at pH 7.5 was studied. Four different methods were used to determine the degree of proteolysis. After mixtures of hemoglobin and insulin were incubated for 2 hours, very little amino acid or peptide material was liberated from the proteins. As many amino acids are liberated from hemoglobin when it is incubated alone under the same conditions. It is concluded that autolysis is responsible for the observed increases in non-protein amino acids and that insulin has no proteolytic activity under the conditions used in this study.
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