Experimental method enhances separation of antibody-bound hormones in immunoassays, suggesting improved accuracy.
Aqueous polyethylene glycol causes precipitation of antibody-bound peptide hormones labeled with radioactive iodine with little or no precipitation of free hormones. Based on this finding, a method of separation has been developed and applied to radioimmunoassays of insulin, parathyroid hormone, growth hormone and arginine vasopressin. The new method provides several advantages over the double-antibody precipitation method. It appears particularly valuable in immunoassays of substances of low molecular weight.
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Desbuquois et al. (1971) studied this question.
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