Kenichi Harada

A Nonempirical Method Using LC/MS for Determination of the Absolute Configuration of Constituent Amino Acids in a Peptide:  Combination of Marfey's Method with Mass Spectrometry and Its Practical Application

Kiyonaga Fujii, Yoshitomo Ikai, Hisao Oka et al. · Analytical Chemistry · 1997 · 468 citations

Pharmacy, Biochemistry, Analytical Chemistry +16

Formation, characterization, and toxicity of the glutathione and cysteine conjugates of toxic heptapeptide microcystins

Fumio Kondo, Yoshitomo Ikai, Hisao Oka et al. · Chemical Research in Toxicology · 1992 · 205 citations

Pharmacy, Biochemistry, Toxicology +15

Structural determination of geometrical isomers of microcystins LR and RR from cyanobacteria by two-dimensional NMR spectroscopic techniques

Kenichi Harada, Kiyoshi OGAWA, Kenji Matsuura et al. · Chemical Research in Toxicology · 1990 · 150 citations

Life Sciences, Chemistry, Toxicology +12

Identification of unlawful food dyes by thin-layer chromatography-fast atom bombardment mass spectrometry

Hisao Oka, Yoshitomo Ikaia, Tsutomo Ohno et al. · Journal of Chromatography A · 1994 · 63 citations

Natural Sciences, Chemistry, Food Science +10

Improvement of chemical analysis of antibiotics

Yoshitomo Ikai, Hisao Oka, Norihisa Kawamura et al. · Journal of Chromatography A · 1989 · 39 citations

Pharmacy, Chemistry, Pharmaceutical Analysis +7