Abstract
A rapid chemical method for detection of insulin-binding antibodies and separation of free and antibody-bound insulin in human antiserums is described. With NaCl-saturated 76% ethanol solution in 0.01 M KOH at −12°C to −10°C, 87% − 100% of antibody-bound insulin was precipitated from 15 of 18 insulin antiserums whereas 85% − 94% of unbound insulin in control serums remained in solution.