Abstract

A procedure is described for the radioiodination of proteins using an iodinated derivative of N-succinimidyl 3(trinbutylstannyl) benzoate (ATE). Adequate removal of unreacted ATE from [ 125I]ATE was necessary for optimal protein radioiodination. Labeling efficiencies of greater than 60% could be obtained after a 20 min incubation of goat IgG with [ 125I]ATE at 4°C. Paired-label experiments with goat IgG labeled with 125I using ATE and 131I using Iodogen demonstrated that use of the ATE reagent for protein labeling significantly reduced ( P < 0.005) the thyroid uptake of radioiodine.

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