Importance

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Abstract

Proteins are radiolabeled with radionuclides of technetium or rhenium by a process in which the disulfide bonds of the protein are first partially reduced with stannous salts or other disulfide reducing agents, all substances other than the desired reduced protein removed, by size exclusion chromatography or other purification means, and a specified, smaller amount of pertechnetate or perrhenate reducing agent, such as a stannous salt, is added to the reduced protein in a manner such that further reduction of the protein is limited. Pertechnetate or perrhenate is then added to the mixture of the reduced protein and the pertechnetate or perrhenate reducing agent; the pertechnetate or perrhenate is reduced and becomes strongly bonded to the protein via the sulfhydryl groups previously exposed by reduction of disulfide groups. The reduced protein and pertechnetate or perrhenate reducing agent can be indefinitely stored frozen or lyophilized.

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First Claim