1. Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
2. Nagasaki Agricultural and Forestry Technical Development Center, Higashisonogi Tea Research Station, 1414 Nakano-go, Higashisonogi, Nagasaki 859-3801, Japan
3. Industrial Technology Center of Nagasaki, 2-1303-8 Ikeda, Omura, Nagasaki 856-0026, Japan
4. Department of Nutrition, University of Nagasaki, 1-1-1 Manabino, Nagayo, Nagasaki 852-2195, Japan
5. Faculty of Agriculture, Graduate School of Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan