title: Determination of muscarine in human urine by electrospray liquid chromatographic-mass spectrometric.
abstract: A liquid chromatography-mass spectrometry based method for determination of muscarine in human urine was developed and validated. The method involved a solid phase extraction of muscarine from urine using Strata X-CW column. Separation of muscarine was achieved within 16.0 min on a reversed phase Gemini C18 analytical column (150 mm × 2.0mm i.d., 5 μm) with a mobile phase consisted of aqueous 8 mmol/L heptafluorobutyric acid and acetonitrile in a gradient mode. Mass spectrometric detection was performed at m/z 174 and m/z 216 for muscarine and acetylmuscarine (internal standard), respectively. The linearity was satisfactory with a coefficient of determination (R(2)) 0.9993 at concentration range from 0.3 ng/mL to 2.0 μg/mL, LOD and LOQ for muscarine was 0.09 ng/mL and 0.3 ng/mL, respectively. The found out recoveries of muscarine were 96% or 95% for concentration 0.3 ng/mL and 0.2 μg/mL or 2.0 μg/mL, respectively. The precision in the intra-assay-study varied from 0.48% to 1.39% and in the inter-assay-study from 2.39% to 5.49%. The accuracy ranged from -3.3% to -6%. The validation results demonstrated that the method fulfilled satisfactory requirements for precision and accuracy across the calibration curve. The applicability of the method has been demonstrated by analyzing clinical urine samples. The method offers the fast objective identification of intoxication by muscarine and can become a routine screening alternative to more difficult microscopic examination of spores in the gastric content in clinical practice.
authors.affiliation: Institute of Forensic Medicine and Medical Law, Medical Faculty, Palacky University, Hněvotínská 3, 775 09 Olomouc, Czech Republic. barbora.merova@upol.cz
authors.forename: Barbora
authors.initials: B
authors.lastname: Merová
authors.forename: Peter
authors.initials: P
authors.lastname: Ondra
authors.forename: Marie
authors.initials: M
authors.lastname: Staňková
authors.forename: Miroslav
authors.initials: M
authors.lastname: Soural
authors.forename: Jan
authors.initials: J
authors.lastname: Stříbrný
authors.forename: Lenka
authors.initials: L
authors.lastname: Hebká
authors.forename: Karel
authors.initials: K
authors.lastname: Lemr
mesh_terms: D056148:Chromatography, Reverse-Phase / Q000379:methods*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009116:Muscarine / Q000652:urine*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*
chemical_list: D009116:Muscarine