Chemical and Pharmaceutical Bulletin p. 2199 - 2201 (1992)
Update date:2022-07-29
Topics:
Takeyama
Otaka
Fujii
A sensitive and specific double-antibody enzyme immunoassay (EIA) for a thyrotropin releasing hormone (TRH)-like immunoreactive substance has been developed. In order to synthesize TRH-labeled β-D-galactosidase (β-gal), a newly devised TRH derivative, pGlu-His-Pro-NH-(CH2)6-NH2 (TRH-Hex), was employed. TRH-Hex was linked to β-gal by the N-(ε-maleimidocaproyloxy) succinimide coupling procedure. For competitive reactions, the TRH antibody was incubated with standard TRH and TRH-Hex-β-gal (delayed addition). Free and antibody-bound enzyme hapten were separated by using an anti-rabbit immunoglobulin G coated immunoplate. Activity of the enzyme on the plate was fluorometrically determined. The present immunoassay allows detection of 0.8 to 100 pmol/well of TRH.
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