... Higashimita, Tama-ku, Kawasaki, Kanagawa, 214-8571, Japan ** Faculty of Life and Environmental Sciences, Prefectural University of Hiroshima, 562, Nanatsuka, Shobara, Hiroshima 727-0023, Japan *** ... (Kobayashi et al., 200 7a) . MATERIALS AND METHODS Untreated water As described in our previous paper (Kobayashi et al., 200 7a) , water was taken from a municipal water filtering plant (Miyoshi, ... J. Agric. Food Chem., 44, 2646-2649. Japan Water Works Association (JWWA). (2001). The method of Japan Water Works Association. p.573-613 (in Japanese). Kobayashi, F., Hayata, Y., Kohara,...