2019
Noninvasive determination of human cortisol and dehydroepiandrosterone sulfate using liquid chromatography-tandem mass spectrometry
Cao Z, Wemm SE, Han L, Spink DC, Wulfert E. Noninvasive determination of human cortisol and dehydroepiandrosterone sulfate using liquid chromatography-tandem mass spectrometry. Analytical And Bioanalytical Chemistry 2019, 411: 1203-1210. PMID: 30612174, DOI: 10.1007/s00216-018-1549-x.Peer-Reviewed Original ResearchConceptsLC-MS/MS methodLiquid chromatography-tandem mass spectrometryChromatography-tandem mass spectrometryHuman salivaMeasurement of steroidsPsychoneuroendocrinological researchSalivary DHEADHEACortisolSalivary cortisolSaliva samplesNoninvasive meansCortisol assayYoung adultsSteroidsRegression analysisSalivaMS methodPassive droolNoninvasive determinationHuman cortisolCommon steroidsMales
2013
An LC–MS assay for the screening of cardiovascular medications in human samples
Dias E, Hachey B, McNaughton C, Nian H, Yu C, Straka B, Brown NJ, Caprioli RM. An LC–MS assay for the screening of cardiovascular medications in human samples. Journal Of Chromatography B 2013, 937: 44-53. PMID: 24013190, PMCID: PMC3800555, DOI: 10.1016/j.jchromb.2013.08.010.Peer-Reviewed Original ResearchConceptsAngiotensin II receptor blockersDrug metabolitesCardiovascular drugsDrug classesHospitalized patientsSingle LC-MS/MS methodLC-MS assayLC-MS/MS methodII receptor blockersCalcium channel blockersCardiovascular drug classesClinical samplesDrug detectionSpiked samplesMS methodCardiovascular medicationsReceptor blockersBeta blockersMedication administrationChannel blockersEnzyme inhibitorsClinical settingBlockersDrugsSimultaneous analysisRapid detection of carbapenemase activity through monitoring ertapenem hydrolysis in Enterobacteriaceae with LCMS/MS
Peaper DR, Kulkarni MV, Tichy AN, Jarvis M, Murray TS, Hodsdon ME. Rapid detection of carbapenemase activity through monitoring ertapenem hydrolysis in Enterobacteriaceae with LCMS/MS. Bioanalysis 2013, 5: 147-157. PMID: 23330558, PMCID: PMC5753620, DOI: 10.4155/bio.12.310.Peer-Reviewed Original ResearchConceptsLife-threatening infectionsIll patientsGram-negative rodsDiagnostic testsExpression of carbapenemasesAvailable diagnostic testsRapid diagnostic testsRatios of metabolitesLC-MS/MSCarbapenemase activityHodge testCarbapenem resistanceCarbapenemase productionCarbapenem antibioticsΒ-lactam antibioticsThreshold cutoffDA increaseErtapenem hydrolysisLC-MS/MS methodPatientsClinical laboratoriesAntibioticsLCMS/MSInfectionPhysiological levels
2012
Highly sensitive and selective measurement of underivatized methylmalonic acid in serum and plasma by liquid chromatography-tandem mass spectrometry
Yuan C, Gabler J, El-Khoury JM, Spatholt R, Wang S. Highly sensitive and selective measurement of underivatized methylmalonic acid in serum and plasma by liquid chromatography-tandem mass spectrometry. Analytical And Bioanalytical Chemistry 2012, 404: 133-140. PMID: 22618327, DOI: 10.1007/s00216-012-6099-z.Peer-Reviewed Original ResearchConceptsLC-MS/MS methodSample preparationMS methodAnion exchange solid phase extractionChromatography-tandem mass spectrometry methodLiquid chromatography-tandem mass spectrometry methodNegative electrospray modeSuccinic acidOrganic acid columnStrong anion-exchange solid-phase extractionSolid-phase extraction
2011
A simple and fast liquid chromatography–tandem mass spectrometry method for measurement of underivatized l-arginine, symmetric dimethylarginine, and asymmetric dimethylarginine and establishment of the reference ranges
El-Khoury JM, Bunch DR, Reineks E, Jackson R, Steinle R, Wang S. A simple and fast liquid chromatography–tandem mass spectrometry method for measurement of underivatized l-arginine, symmetric dimethylarginine, and asymmetric dimethylarginine and establishment of the reference ranges. Analytical And Bioanalytical Chemistry 2011, 402: 771-779. PMID: 22124751, DOI: 10.1007/s00216-011-5462-9.Peer-Reviewed Original ResearchConceptsFast liquid chromatography–tandem mass spectrometry methodAnalytical cycle timeChromatography-tandem mass spectrometry methodLiquid chromatography-tandem mass spectrometry methodMinimum sample preparationMass spectrometry methodLiquid chromatography-tandem mass spectrometryChromatography-tandem mass spectrometryAsymmetric dimethylarginineSymmetric dimethylarginineLC-MS/MS methodMass spectrometerFormic acidSpectrometry methodMass spectrometrySilica columnProtein precipitationSample preparationInternal standardAmmonium acetateMS methodGlomerular filtration rateAnalytesNitric oxide synthaseΜM
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