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- W2051250212 abstract "[corrected] Measurement of serum thyroxine (T(4)) concentration is important for diagnosis of thyroid gland diseases. We developed a practical homogeneous enzyme immunoassay for thyroxine analysis in unextracted sera.A thyroxine derivative conjugated to a reactive sulfhydryl group of glycogen phosphorylase b (GPb). Conjugation caused inhibition of enzyme activity and the enzyme conjugate was re-activated upon the binding of a polyclonal anti-T(4) antibody. Antibody-activation was blocked by the presence of free T(4).Conjugation affected the allosteric character of the enzyme and the K(m) for the allosteric activator AMP was increased 28 times, while anti-T(4) antibody partially reversed this effect. The optimum concentration ratio of enzyme conjugate to anti-T(4) antibody was determined, and T(4) was measured with desired sensitivity and accuracy in the range between 10 and 240 microg/l. Furosemide was used to inhibit the interaction of thyroxine with serum T(4)-binding sites. Human serum T(4) values obtained by this method correlated well with those obtained by a radioimmunoassay (y=1.9+1.0x, r=0.97, N=72).Chemical modification of glycogen phosphorylase b with a T(4) derivative led to the development of a simple homogenous enzyme immunoassay for T(4) analysis with the desired sensitivity and accuracy." @default.
- W2051250212 created "2016-06-24" @default.
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- W2051250212 date "2001-06-01" @default.
- W2051250212 modified "2023-10-01" @default.
- W2051250212 title "A new homogeneous enzyme immunoassay for thyroxine using glycogen phosphorylase b–thyroxine conjugates" @default.
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- W2051250212 doi "https://doi.org/10.1016/s0009-8981(01)00469-7" @default.
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