1. Department of Life and Food Science, Obihiro University of Agriculture and Veterinary MedicineObihiroHokkaido 080‐8555Japan
2. Food and Biodynamic Chemistry Laboratory, Graduate School of Agricultural Science, Tohoku UniversitySendaiMiyagi 980‐0845Japan
3. Food and Biotechnology Innovation Project, New Industry Creation Hatchery Center (NICHe), Tohoku UniversitySendaiMiyagi 980‐8579Japan
4. Food and Health Science Research Unit, Graduate School of Agricultural Science, Tohoku UniversitySendaiMiyagi 980‐0845Japan