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J Biochem. 1976 Jan;79(1):233-6.

Enzyme coupled immunoassay of insulin using a novel coupling reagent.

Abstract

A novel coupling reagent, meta-maleimidobenzoyl N-hydroxysuccinimide ester was synthesized. Using this reagent, insulin was conjugated very easily with beta-D-galactosidase [EC 3.2.1.23] in neutral, aqueous solution. No reduction of the enzyme activity was observed during the coupling procedure. The competitive bindings of the conjugate and insulin to anti-insulin serum were tested. The results indicated that the conjugate has enough immune reactivity for use in enzyme coupled immunoassay. Using this assay 20-800 pg of insulin were detectable.

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