米アミロース含量と玄米に対する湿熱処理が高脂肪飼料投与ラットの糖質・脂質代謝に及ぼす影響 細川陽子 1, 5，春日景太 1，榎 康明 2，斉藤憲司 3，城 斗志夫 4，奥村寿子 1，菅原正義＊, 1 1 独立行政法人国立高等専門学校機構長岡工業高等専門学校物質工学科
2 株式会社ブルボン健康科学研究所
3 東京大学大学院農学生命科学研究科応用生命化学専攻健康栄養機能学
4 新潟大学農学部農学科
5 新潟大学大学院自然科学研究科 We investigated the influence of amylose content and heat‒moisture treatment of rice on carbohydrate/lipid metabolism in rats.“Koshihikari”brown rice, high-amylose“Koshinokaori”brown rice, and heat‒moisture-treated“Koshihikari”and“Koshinokaori”brown rice were polished and powdered (KH, KK, HMT-KH, and HMT-KK, respectively). KK had both higher resistant starch and dietary fiber content than KH, and the contents of both nutrients were increased by heat‒moisture treatment. KK showed slower starch degradation rate in vitro than KH, and both values were decreased by heat‒moisture treatment. These rice powders were added to high-fat AIN-76 formulated feed and fed to 5-week-old male Wistar rats for 35 days. No significant difference was seen in growth between rats on different feeds. Furthermore, blood triglyceride was significantly decreased in rats fed heat‒moisture‒treated rice. Assay of liver enzyme activity revealed increased glycolytic enzyme activity and decreased fatty acid synthetic enzyme activity in rats fed the heat‒moisture-treated rice.
Key Words: high-amylose rice, brown rice, heat‒moisture treatment, resistant starch, energy metabolism |
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