Timmy L.S. Choi

Doping control analysis of 46 polar drugs in horse plasma and urine using a ‘dilute-and-shoot’ ultra high performance liquid chromatography-high resolution mass spectrometry approach

Wai-Him Kwok, Timmy L.S. Choi, Karen Y. Kwok et al. · Journal of Chromatography A · 2016 · 34 citations

Biochemistry, Horse Plasma, Control Analysis +12

Detection of anabolic and androgenic steroids and/or their esters in horse hair using ultra-high performance liquid chromatography–high resolution mass spectrometry

Karen Y. Kwok, Timmy L.S. Choi, Wai-Him Kwok et al. · Journal of Chromatography A · 2017 · 31 citations

Biochemistry, Medicine, Bioanalysis +10

Detection of seventy-two anabolic and androgenic steroids and/or their esters in horse hair using ultra-high performance liquid chromatography-high resolution mass spectrometry in multiplexed targeted MS2 mode and gas chromatography-tandem mass spectrometry

Timmy L.S. Choi, Karen Y. Kwok, Wai-Him Kwok et al. · Journal of Chromatography A · 2018 · 29 citations

Ms2 Mode, Biochemistry, Gas Chromatography +12

Screening of over 100 drugs in horse urine using automated on-line solid-phase extraction coupled to liquid chromatography-high resolution mass spectrometry for doping control

Wai-Him Kwok, Timmy L.S. Choi, Yeuki Y.K. Tsoi et al. · Journal of Chromatography A · 2017 · 25 citations

Gas Chromatography, Medicine, Drug Purity +14

Doping control analysis of 121 prohibited substances in equine hair by liquid chromatography–tandem mass spectrometry

Jenny K. Y. Wong, Timmy L.S. Choi, Karen Y. Kwok et al. · Journal of Pharmaceutical and Biomedical Analysis · 2018 · 25 citations

Equine-assisted Therapy, Prohibited Substances, Control Analysis +9