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A quantitative LC-APCI-MS/MS method for simultaneous determination of multiple illicit drugs, methadone, and their metabolites in oral fluid was developed and validated. Sample pretreatment was(More)
Base treatment of polyethylene glycol-derivatized superoxide dismutase in which the polyethylene glycol is linked to the protein via a succinyl bridge, removes the polyethylene glycol leaving a(More)