[Fluoroimmunometric method of determining digitoxin].
Digitoxin at concentrations up to 5 x 10(-10) M (therapeutic concentrations are 2 x 10(-8) M) can be reliable measured by a fluoroimmunometric method with coproporphyrin as a tracer. The use of nylon filters with immobilized digitoxin to remove an excess of labelled antibodies increases reliability and reduces the time of measurements, and thus simplifies the assay.
Chromatography, Ion Exchange↗