Abstract
A new and simple competitive enzyme immunoassay method for the measurement of total thyroxine in serum is described. Anti-thyroxine antibodies, raised in sheep with a bovine serum albumin-thyroxine conjugate prepared with carbodiimide as coupling initiator, were physically adsorbed onto a large surface area polypropylene support. Competition occurred between thyroxine in the sample and a thyroxine-peroxidase conjugate prepared with a glutaraldehyde spacer and further purified by octyl Sepharose hydrophobic chromatography. The entire assay was performed in 2 h with a useful range of 10–300 μg/l. The coefficients of variation ranged from 6.9 to 12% and good agreement ( r = 0.93–0.97) was found between this method and 2 radioimmunoassays on 71 serum samples having well distributed thyroxine values.
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