Comparison of GLC-EMIT analysis for the assay of methadone and its major metabolite in urine

Abstract

The enzyme-multiplied immunoassay technique (EMIT) was compared with the gas-liquid chromatographic (GLC) method in the analysis of 130 urine samples from subjects receiving methadone treatment and non-methadone controls. The GC method allowed the quantitation of 2-ethylidene-1,5-dimethyl-3,3-diphenylpyrrolidine, the major metabolite of methadone. A good correlation was found between the two methods. The advantages of using the EMIT system are discussed.