Kiyotaka Usui

Rapid drug extraction from human whole blood using a modified QuEChERS extraction method

Kiyotaka Usui, Yoshie Hayashizaki, Masaki Hashiyada et al. · Legal Medicine · 2012 · 122 citations

Rapid Drug Extraction, Solvent Extraction, Human Whole Blood +13

Rapid determination of disulfoton and its oxidative metabolites in human whole blood and urine using QuEChERS extraction and liquid chromatography–tandem mass spectrometry

Kiyotaka Usui, Yoshie Hayashizaki, Takashi Minagawa et al. · Legal Medicine · 2012 · 57 citations

Human Whole Blood, Biochemistry, Medicine +12

Application of modified QuEChERS method to liver samples for forensic toxicological analysis

Kiyotaka Usui, Masaki Hashiyada, Yoshie Hayashizaki et al. · Forensic Toxicology · 2013 · 42 citations

Sample Treatment, Forensic Chemistry, Forensic Toxicological Analysis +18

Identification of 5-Fluoro ADB in Human Whole Blood in Four Death Cases

Kiyotaka Usui, Yuji Fujita, Yoshito Kamijo et al. · Journal of Analytical Toxicology · 2017 · 39 citations · Full text

Pathology, Whole Blood, Pharmacotherapy +21

A Retrospective Study on the Epidemiological and Clinical Features of Emergency Patients with Large or Massive Consumption of Caffeinated Supplements or Energy Drinks in Japan

Yoshito Kamijo, Michiko Takai, Yuji Fujita et al. · Internal Medicine · 2018 · 37 citations · Full text

Nutrition, Electrolyte Disorder, Serum Caffeine Levels +19