Distribution of Tocotrienols in Rats Fed a Rice Bran Tocotrienol Concentrate

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  • KAWAKAMI Yuki
    Food and Biodynamic Chemistry Laboratory, Graduate School of Agricultural Science, Tohoku University
  • TSUZUKI Tsuyoshi
    Department of Food Management, School of Food, Agricultural and Environmental Sciences, Miyagi University
  • NAKAGAWA Kiyotaka
    Food and Biodynamic Chemistry Laboratory, Graduate School of Agricultural Science, Tohoku University
  • MIYAZAWA Teruo
    Food and Biodynamic Chemistry Laboratory, Graduate School of Agricultural Science, Tohoku University

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To examine the distribution of rice bran tocotrienol (T3), we gave rice bran T3 to rats after considering an acceptable daily intake of vitamin E for humans. Male SD rats (5 weeks of age) were fed for 3 weeks on a commercial diet containing 6.4 mg of vitamin E per 100 g wt and additively received vitamin E or the vehicle (vitamin E-free corn oil) by oral intubation. The animals were randomly divided into 4 groups depending on the type of test diet: control (vehicle), non-T3 (no T3 + 4.3 mg of tocopherol (TOC)/kg body weight (b.w.)/day), low-T3 (0.8 mg T3 + 3.5 mg TOC/kg b.w./day), and high-T3 (3.2 mg T3 + 1.1 mg TOC/kg b.w./day). The control rats and rats in the non-T3, low-T3, and high-T3 groups took 4.3 and 8.6 mg of vitamin E/kg b.w./day, respectively. Rice bran γ-T3 was significantly distributed to the adipose tissue and increased from 1.1 to 10.2 nmol/g of adipose tissue according to the rice bran T3 intake.

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