Unconjugated bile acids in rat brain: Analytical method based on LC/ESI-MS/MS with chemical derivatization and estimation of their origin by comparison to serum levels

Tatsuya Higashi, Shui Watanabe, Koki Tomaru, +7

Steroids

BiochemistryBiliary TractBioanalysisRat BrainSerum Levels +6

A novel Cookson‐type reagent for enhancing sensitivity and specificity in assessment of infant vitamin D status using liquid chromatography/tandem mass spectrometry

Shoujiro Ogawa, Satoshi Ooki, Misato Morohashi, +2

Rapid Communications in Mass Spectrometry

Development and validation of the simultaneous measurement of four vitamin D metabolites in serum by LC–MS/MS for clinical laboratory applications

Mamoru Satoh, Takayuki Ishige, Shoujiro Ogawa, +4

Analytical and Bioanalytical Chemistry

MicronutrientsMedicineClinical Laboratory ApplicationsBioanalysisMass Spectrometry +10

Analysis of urinary vitamin D3 metabolites by liquid chromatography/tandem mass spectrometry with ESI-enhancing and stable isotope-coded derivatization

Shoujiro Ogawa, Satoshi Ooki, Kenta Shinoda, +1

Analytical and Bioanalytical Chemistry

UrologyBiochemistryBioanalysisMass SpectrometryMetabolomic Profiling +10

Development and validation of a method for determination of plasma 25-hydroxyvitamin D3 3-sulfate using liquid chromatography/tandem mass spectrometry

Tatsuya Higashi, Ayaka Goto, Misato Morohashi, +5

Journal of Chromatography B

MedicineBioanalysisMass SpectrometryAnalytical ChemistryClinical Chemistry +2

Detection of Δ4-3-oxo-steroid 5β-reductase deficiency by LC–ESI-MS/MS measurement of urinary bile acids

Akina Muto, Hajime Takei, Atsushi Unno, +13

Journal of Chromatography B

UrologyBiochemistryBiliary TractMedicineBioanalysis +7

Regioselective Oxyfunctionalization of Unactivated Carbons in Steroids by a Model of Cytochrome P-450:  Osmiumporphyrin Complex/<i>tert</i>-Butyl Hydroperoxide System

Takashi Iida, Shoujiro Ogawa, Keiji Hosoi, +6

The Journal of Organic Chemistry

Bioorganic ChemistryOrganic ChemistryChemistryChemical BiologyRedox Biology +17

(S)-1-(4-Dimethylaminophenylcarbonyl)-3-aminopyrrolidine: A derivatization reagent for enantiomeric separation and sensitive detection of chiral carboxylic acids by LC/ESI-MS/MS

Shoujiro Ogawa, Hiroaki Tadokoro, Maho Sato, +2

Journal of Chromatography B

EngineeringMedicineOrganic ChemistryEnantiomeric SeparationStereoselective Synthesis +7

LC/ESI‐MS/MS method for determination of salivary eicosapentaenoic acid concentration to arachidonic acid concentration ratio

Shoujiro Ogawa, Koki Tomaru, Nagisa Matsumoto, +2

Biomedical Chromatography

Enantioselective determination of ibuprofen in saliva by liquid chromatography/tandem mass spectrometry with chiral electrospray ionization-enhancing and stable isotope-coded derivatization

Shoujiro Ogawa, Hiroaki Tadokoro, Maho Sato, +1

Journal of Pharmaceutical and Biomedical Analysis

BiochemistryGas ChromatographyMedicineChiral Electrospray Ionization-enhancingBioanalysis +9