Determination of tricyclic antidepressant drugs in the presence of interfering substances

摘要

Method and reagents for determining a compound of interest present in a test sample also containing one or more interfering compounds having substantially similar chemical structures, and otherwise analytically indistinguishable from each other, employing a pretreatment reagent capable of selectively modifying the chemical structure of one of the compounds without significantly modifying or altering the chemical structure of the other one of the compounds. The selective modification results in the modified compound having a chemical structure which is substantially dissimilar to the chemical structure of the other one of said compounds wherein the compounds are substantially distinguishable from each other to permit the analytical determination of one or the other of such compounds by immunoassay, high pressure liquid chromatography, and thin layer chromatography techniques, especially for the fluorescent polarization immunoassay determination of tricyclic antidepressant drugs in the presence of phenothiazines.