An enzyme-linked immunoassay for thromboxane B2 and 6-oxo-PGF1 alpha using peroxidase as label.

A sensitive and specific enzyme immunoassay was developed for TXB2 and 6-oxo-PGF1 alpha, stable degradation products of TXA2 and prostacyclin. The hapten molecule was labeled with pure peroxidase. After competitive binding to antibody between enzyme-labeled and free prostanoids the immunoreactive complex was precipitated by double antibody technique. The enzyme activity of the precipitate was determined spectrophotometrically. The procedure allowed a determination of TXB2 and 6-oxo-PGF1 alpha in the range of 3-200 pg (0.008-0.53 pmol) and 10-1000 pg (0.028-2.8 pmol) respectively.