A procedure is described for the extraction and determination of morphine (M), hydromorphone (HM), codeine (C) and metoclopramide (MCP) present in human plasma. The drugs are separated by reversed-phase liquid chromatography and detected amperometrically at a glassy carbon electrode. The method provides high sensitivity and selectivity and has been used successfully in bioavailability studies.

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http://dx.doi.org/10.1016/0731-7085(89)80198-0DOI Listing

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