Rapid drug extraction from human whole blood using a modified QuEChERS extraction method.
- Kiyotaka Usui, Yoshie Hayashizaki, M. Hashiyada, M. Funayama
- BiologyLegal Medicine
- 1 November 2012
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, T. Minagawa, M. Hashiyada, Anri Nakano, M. Funayama
- Chemistry, MedicineLegal Medicine
- 1 November 2012
Determination of chlorhexidine (CHD) and nonylphenolethoxylates (NPEOn) using LC-ESI-MS method and application to hemolyzed blood.
- Kiyotaka Usui, T. Hishinuma, H. Yamaguchi, Naoki Tachiiri, J. Goto
- BiologyJournal of chromatography. B, Analytical…
- 2 February 2006
Rapid and simultaneous extraction of acidic and basic drugs from human whole blood for reliable semi-quantitative NAGINATA drug screening by GC–MS
- K. Kudo, Y. Usumoto, N. Ikeda
- BiologyForensic Toxicology
- 2013
The proposed method should prove useful for semi-quantitative screening of a wide range of drugs and poisons in whole blood samples in clinical and forensic cases and is useful for rapid diagnosis of drug intoxication.
Quantitative analysis of 3,4-dimethylmethcathinone in blood and urine by liquid chromatography-tandem mass spectrometry in a fatal case.
- Kiyotaka Usui, Tomomi Aramaki, M. Hashiyada, Yoshie Hayashizaki, M. Funayama
- ChemistryLegal Medicine
- 1 July 2014
Clinical and toxicological findings of acute intoxication with synthetic cannabinoids and cathinones
- Y. Fujita, Atsuhiko Koeda, Y. Inoue
- MedicineAcute Medicine & Surgery
- 1 July 2016
Reporting of the analytical and clinical findings of synthetic cannabinoids and cathinones is essential in carrying out a complete clinical assessment of new psychoactive substances.
Simultaneous determination of 11 aconitum alkaloids in human serum and urine using liquid chromatography-tandem mass spectrometry.
- Kiyotaka Usui, Yoshie Hayashizaki, M. Hashiyada, Anri Nakano, M. Funayama
- ChemistryLegal Medicine
- 1 May 2012
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
- Y. Kamijo, M. Takai, Y. Fujita, Kiyotaka Usui
- MedicineInternal medicine
- 9 March 2018
The present analysis of data from more than 100 emergency patients revealed clinical features of moderate to fatal caffeine poisoning, and recommends highlighting the toxicity risks associated with ingesting highly caffeinated tablets.
Formation of (R)-2,3-dihydrogeranylgeranoic acid from geranylgeraniol in rat thymocytes.
- Yuichi Kodaira, Kiyotaka Usui, I. Kon, H. Sagami
- Chemistry, BiologyJournal of Biochemistry (Tokyo)
- 1 August 2002
In a metabolic study of [1-(14)C]geranylgeranial involving rat thymocytes, the radioactivity was mainly incorporated into two metabolites, Z1 and Z2, the latter moving slower than the former on a silica-gel thin-layer plate, which superficially suggested a precursor-product relationship between Z1and Z2.
A case of death after ingestion of an agrochemical spreading agent.
- Kiyotaka Usui, Yoshie Hayashizaki, Yoshikazu Okubo, M. Hashiyada, M. Funayama
- ChemistryForensic Science International
- 15 July 2011
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