Volume 20, Issue 1 (January 1975)
A Simple, Rapid 125I Radioimmunoassay for the Detection of Barbiturates in Biological Fluids
A radioimmunoassay using a 3H- or 125I-labeled morphine antigen has been shown to be of practical value for the rapid detection of nanogram amounts of morphine and morphine analogs in biological fluids [1–3]. A radioimmunoassay for detection of barbiturates by conjugation of a secobarbital derivative to protein was also developed utilizing 14C-labeled pentobarbital or barbital [4,5]. The present report describes our experiences with a practical radioimmunoassay for barbiturates employing a secobarbital derivative labeled with 125I, as the antigen.