1. Laboratory of Nutrition, Department of Applied Biological Chemistry, Faculty of Agriculture, Tohoku University, Aoba-ku, Sendai 981, Japan
2. Department of Basic Sciences, Ishinomaki Senshu University, Minamisakai Shinmito, Ishinomaki 986, Japan
3. Carbohydrate Research Laboratory, Ensuiko Sugar Refining, Daikoku-cho, Tsurumi-ku, Yokohama 230, Japan