Department of Agricultural Chemistry, National Taiwan University, Taipei, Taiwan.
J Agric Food Chem. 2011 Oct 26;59(20):11150-9. doi: 10.1021/jf202884p. Epub 2011 Oct 5.
The eight vitamin E isomers [α-, β-, γ-, and δ-tocopherols (T) and α-, β-, γ-, and δ-tocotrienols (T3)] and γ-oryzanol are known to possess diverse biological activities. This study examined the contents of these compounds and their distribution in 16 commercial rice varieties in Taiwan. Results showed that the order of vitamin E, total T, total T3, and γ-oryzanol contents was rice bran > brown rice > rice husk > polished rice. γ-T3 was the highest vitamin E isomer present in all rice samples, while β-T, β-T3, δ-T, and δ-T3 were present in trace amounts. The Japonica varieties contained a higher total T, total T3, and γ-oryzanol than the Indica varieties. They also have a higher level of α-T and α-T3 but a lower level of γ-T and γ-T3 than the Indica varieties. However, no obvious difference in total T, total T3, and γ-oryzanol content was noted between black- and red-colored rice varieties.
这 8 种维生素 E 异构体（α-、β-、γ-和 δ-生育酚（T）和 α-、β-、γ-和 δ-生育三烯酚（T3））和γ-谷维素已知具有多种生物活性。本研究检测了台湾 16 种商业稻米品种中这些化合物的含量及其分布。结果表明，维生素 E、总 T、总 T3 和γ-谷维素的含量顺序为米糠>糙米>稻壳>精米。γ-T3 是所有稻米样品中含量最高的维生素 E 异构体，而β-T、β-T3、δ-T 和 δ-T3 则含量很少。与籼稻品种相比，粳稻品种的总 T、总 T3 和γ-谷维素含量更高。它们还具有更高水平的α-T 和α-T3，但γ-T 和γ-T3 水平低于籼稻品种。然而，黑米和红米品种之间的总 T、总 T3 和γ-谷维素含量没有明显差异。
