1. Department of Food Science and Nutrition, Pusan National University, Busandaehak-ro 63 beon-gil, Geumjeong-gu, Busan 609-735, Korea.
2. Amino Up Chemical Co., Ltd, Sapporo 004-0839, Japan.
3. Institute of Natural Medicine, University of Toyama, Toyama 930-0194, Japan.