| Budget Amount *help |
¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 2005: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2004: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2003: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Research Abstract |
We have reported the high stability of sterols trapped within pottery compared to glycerides or fatty acids. Based on this finding, the usage of Jomon (Kasori E) shallow and deep dishes were discussed from the recovery of sterols adsorbed to the different parts of pottery. In addition, Jomon diet was compared with present diet.
Although pottery shards seemed free of adhered materials, all contained sterols. When sterols were recovered from the surface (extracted from shards directly) as well as the core (extracted from pulverized shards after direct extraction), more sterols were found to remain at the core. The standard method of extraction is to thinly grind the surface and extract the shards as is. However, present finding indicated that large amount of lipids still remain unextracted under authentic method.
The shallow dish contained more total sterol at the base than the body or the top of the pottery. On the other hand, more total sterol was found at the body and the base than the top in the deep dish. Archaeologically, the shallow dish is defined to serve food, where as the deep dish is used for cooking. Present findings support archaeological viewpoint since when food is served on a dish, fat will accumulate at the bottom, and when food is cooked in a soup, fat will float to the upper section of the body as well as remain at the bottom when soup is consumed. There were no statistical differences in the ratio of total plant sterol to cholesterol between shallow and deep dishes or the surface and the core. These results indicate that similar food was contained in both shallow and deep dishes.
The average value of total plant sterol to cholesterol ratio was similar to that of present meal, indicating Jomon diet was comparable to present diet.
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