Determination of (E)-2,3-dichloro-4-methoxyphenyl)-2-furanylmethanone-O-[2-(diethylamino) ethyl]oxime methanesulphonate (ANP-4364) in plasma using gas chromatography with electron-capture detection.

A gas chromatographic method has been developed that permits the accurate and specific determination of the antianginal agent ANP-4364 in plasma. ANP-4364 is extracted with n-hexane containing ethyl chloroformate and, after a clean-up procedure, derivatized to the trichloroethyl carbamate, which is assayed on a gas chromatograph equipped with an electron-capture detector. Accurate determinations are possible over a concentration range from 1 to 50 ng/ml of ANP-4364 in plasma with a relative standard deviation of 7.5%. The minimum detectable concentration is 0.5 ng/ml. Plasma levels of ANP-4364 in dogs receiving oral (10 mg/kg) or intravenous (0.1 mg/kg) dosing have been determined.