1. Food Research and Development Institute; Morinaga Milk Industry Co., Ltd.; Kanagawa 252-8583 Japan
2. Department of Chemical Engineering; Graduate School of Science and Engineering; Tokyo Institute of Technology; Tokyo 152-8552 Japan
3. Food Science and Technology Institute; Morinaga Milk Industry Co., Ltd.; Kanagawa 252-8583 Japan
4. Engineering Research Laboratory; Morinaga Milk Industry Co., Ltd.; Tokyo 207-0021 Japan
5. Research Section; Morinaga Milk Industry Co., Ltd.; Kanagawa 252-8583 Japan