Hiroki Okumura
University of Tokyo
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Featured researches published by Hiroki Okumura.
Food and Agricultural Immunology | 1993
Hiroki Okumura; Junko Okimoto; Seishi Kishimoto; Akihiro Hasegawa; Osamu Kawamura; Masahiro Nakajima; Masaki Miyabe; Yoshio Ueno
Among three newly prepared monoclonal anti‐aflatoxin M1 antibodies, named AM.1, AM.2 and AM.3, both AM.1 and AM.3 possessed high specificity and sensitivity towards aflatoxin M1, while AM.2 exhibited lower specificity. Employing AM.3 and horseradish peroxidase‐labelled second antibody, an improved ELISA was developed with a detection limit of 1.0 pg ml‐1 of aflatoxin M1 in solution. The contents of aflatoxin M1 in powdered milks suspended in water were assayed by the indirect ELISA. The detection limit was 5 pg g‐1dry weight, and no clean‐up procedures were required. The reliability of the present ELISA with monoclonal antibody AM.3 was confirmed with reference powdered milks for aflatoxin M1. A limited ELISA survey showed the presence of aflatoxin M1 in commercial milk powders sampled in France, the US and Thailand at levels of 30–418 pg g‐1, and it was confirmed by an improved HPLC analysis.
Virchows Archiv | 1998
Tomomi Ihara; Tsukiko Yamamoto; Miho Sugamata; Hiroki Okumura; Yoshio Ueno
Natural Toxins | 2006
Naoto Yoshino; Mari Takizawa; Hidenori Akiba; Hiroki Okumura; Fumio Tashiro; Mitsuo Honda; Yoshio Ueno
Natural Toxins | 1992
Masashi Sakai; Ken-Ichi Abe; Hiroki Okumura; Osamu Kawamura; Yoshitsugu Sugiura; Yoshikazu Horie; Yoshio Ueno
Carcinogenesis | 1993
Hiroki Okumura; Osamu Kawamura; Seishi Kishimoto; Akihiro Hasegawa; Santosh M. Shrestha; Kunio Okuda; Hiroshi Obata; Hiroaki Okuda; Kousuke Haruki; Toshikazu Uchida; Yasuko Ogasawara; Yoshio Ueno
Journal of Toxicological Sciences | 1998
Masao Sugamata; Tsukiko Hattori; Tomomi Ihara; Hiroki Okumura; Naoto Yoshino; Yoshio Ueno
Mycotoxins | 1997
Yoshio Ueno; Yukiko Aikawa; Hiroki Okumura; Yoshitsugu Sugiura; Kazumi Nakamura; Rokuro Masuma; Toshitsugu Tanaka; Christopher J. Young; Mare E. Savard
Archive | 2002
Hiroki Okumura; Jeemi Lim; Seishi Kishimoto; Osamu Kawamura; Chen Gang; Shun-Zhang Yu; Yoshio Ueno
Mycotoxins | 1996
Osamu Kawamura; J.-M. Lim; Hiroki Okumura; Sigefumi Kishimoto; Gong-Chao Chen; Shun-Zhang Yu; Yoshio Ueno
Mycotoxins | 2000
Hiroki Okumura; Naoto Yoshino; Tomomi Ihara; Masao Sugamata; Yoshio Ueno