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J.Health Sci., 55(2), 290-293, 2009
Dioxin Concentrations in Commercial Health Tea Materials in Japan
Yoshiaki Amakura,*, a Tomoaki Tsutsumi,b
Kenji Tanno,c Koichi Nomura,c
Toshihiko Yanagi,c Yoichi Kono,c
Morio Yoshimura,a Tamio Maitani,b
Rieko Matsuda,band Takashi Yoshidaa
aCollege of Pharmaceutical Sciences, Matsuyama University, 4-2 Bunkyo-cho, Matsuyama, Ehime 790-8578, Japan,
bDivision of Foods, National Institute of Health Sciences, 1-18-1 Kamiyoga, Setagaya-ku, Tokyo 158-8501, Japan and
cJapan Food Research Laboratories, 52-1 Motoyoyogi-cho, Shibuya-ku, Tokyo 151-0062, Japan
This study determined the concentrations of polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs), and dioxin-like polychlorinated biphenyls (dioxin-like PCBs) in five selected plant materials [dokudami (from houttuynia herb), rose hip (from rosa fruit), ebisugusa (from cassia seed), rooibos, and tochu (from eucommia leaf)] used as health teas in Japan. The toxic equivalent (TEQ) levels for dioxins in the samples ranged from <0.001 to 0.27 pg-TEQ/g weight, when undetectable and trace amounts were taken as zero. The mean of total TEQ level in commercial tea materials was estimated as 0.08 pg-TEQ/g (n=5). The total TEQ in these samples was mainly dominated by the levels of PCDD/Fs (representing ca. 80% of the total TEQ).
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