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Sensitive and simple determination of zwitterionic morphine in human urine based on liquid-liquid micro-extraction coupled with surface-enhanced Raman spectroscopy

Human UrineSimple DeterminationEngineeringMedicineDrug PurityBioanalysisDrug TestAnalytical ChemistryBiomedical EngineeringChemistryClinical ChemistryZwitterionic MorphinePharmacologyLiquid ChromatographyChromatographyDrug Analysis