1. Faculty of Agriculture; Iwate University; Morioka Iwate 020-8550 Japan
2. Food Research Institute, NARO; Tsukuba Ibaraki 305-8642 Japan
3. Graduate School of Horticulture; Chiba University; Matsudo Chiba 271-8510 Japan
4. Kagoshima-Osumi Food Technology Development Center; Kanoya Kagoshima 893-1601 Japan