1. Laboratory of Functional Food Science and COE Program in the 21st Century, School of Food and Nutritional Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan, Pokka Corporation, 45-2 Juuniso, Kumanoshou, Kitanagoya, Aichi 481-8515, Japan, and Japan Propolis Conference, 6-27-12 Honmachi, Nakano, Tokyo 164-0012, Japan