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J.Health Sci., 50(6), 576-580, 2004
Photodecomposition and Bioconcentration of a Bisphenol A Metabolite in Medaka,
Oryzias latipes
Yuji Takao,*, a Miki
Shimazu,a Shinya
Kohra,a Masaki
Nagae,a Yasuhiro
Ishibashi,b
Nobuaki Tominaga,c Hiroshi
Ishibashi,d Shinich
Yoshihara,e and Koji
Arizonod
aFaculty of Environmental Studies,
bEnvironmental Protection Center, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521,
Japan, cDepartment of Chemical and Biological Engineering, Ariake National College of Technology, 150 Higashihagio, Omuta,
Fukuoka 836-8585, Japan, dFaculty of Environmental and Symbiotic Sciences, Prefectural University of Kumamoto, 3-1-100 Tsukide,
Kumamoto 862-8502, Japan, and eGraduate School of Biomedical Sciences, Hiroshima University, Kasumi 1-2-3, Minami-ku,
Hiroshima 734-8551, Japan
Exposure experiments in medaka and photodecomposition tests were performed using a metabolite of bisphenol
A [4-methyl-2,4-bis(p-hydroxyphenyl)-pent-1-ene; MBP], the solubility limit of which is 42 mg/l of water. Three
adult medaka were kept in a 2 l glass beaker at 25 ± 1°C for 4 days. The
LC50 for 96 hr was > 1000 ppb. The measured average MBP concentration in the breeding water (nominal concentration of 100 ppb) was 49.2 ppb. The
average concentration in the whole bodies of medaka after 4 days was 1.92 mg/g-wet body, and the bioconcentration
factor (BCF) of MBP was calculated to be 39.0. MBP in water and acetone was decomposed very easily, with about
98% of the MBP being decomposed after several hours under sunlight. MBP was also decomposed after 48 hr of
illumination under a white fluorescent lamp.
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