Mingyai Sukanya, Srikaeo Khongsak, Kettawan Aikkarach, Singanusong Riantong, Nakagawa Kiyotaka, Kimura Fumiko, Ito Junya
Department of Agro-Industry, Faculty of Agriculture, Natural Resources and Environment, Naresuan University.
Faculty of Food and Agricultural Technology, Pibulsongkram Rajabhat University.
J Oleo Sci. 2018 Feb 1;67(2):135-142. doi: 10.5650/jos.ess17122. Epub 2018 Jan 23.
Rice bran oil (RBO) especially from colored rice is rich in phytochemicals and has become popular in food, cosmetic, nutraceutical and pharmaceutical applications owing to its offering health benefits. This study determined the contents of phytochemicals including oryzanols, phytosterols, tocopherols (Toc) and tocotrienols (T3) in RBOs extracted using different methods namely cold-press extraction (CPE), solvent extraction (SE) and supercritical CO extraction (SC-CO). Two colored rice, Red Jasmine rice (RJM, red rice) and Hom-nin rice (HN, black rice), were studied in comparison with the popular Thai fragrant rice Khao Dawk Mali 105 (KDML 105, white rice). RBOs were found to be the rich source of oryzanols, phytosterols, Toc and T3. Rice varieties had a greater effect on the phytochemicals concentrations than extraction methods. HN rice showed the significantly highest concentration of all phytochemicals, followed by RJM and KDML 105 rice, indicating that colored rice contained high concentration of phytochemicals in the oil than non-colored rice. The RBO samples extracted by the CPE method had a greater concentration of the phytochemicals than those extracted by the SC-CO and SE methods, respectively. In terms of phytochemical contents, HN rice extracted using CPE method was found to be the best.
米糠油（RBO），尤其是有色米的米糠油，富含植物化学物质，由于其具有健康益处，已在食品、化妆品、营养保健品和制药应用中广受欢迎。本研究测定了用不同方法提取的米糠油中植物化学物质的含量，这些方法包括冷榨提取（CPE）、溶剂提取（SE）和超临界CO₂提取（SC-CO₂）。研究了两种有色米，红茉莉香米（RJM，红米）和Hom-nin米（HN，黑米），并与广受欢迎的泰国香米Khao Dawk Mali 105（KDML 105，白米）进行了比较。发现米糠油是谷维素、植物甾醇、生育酚（Toc）和生育三烯酚（T3）的丰富来源。水稻品种对植物化学物质浓度的影响大于提取方法。HN米的所有植物化学物质浓度均显著最高，其次是RJM米和KDML 105米，这表明有色米的油中植物化学物质浓度高于非有色米。通过CPE方法提取的米糠油样品中植物化学物质的浓度分别高于通过SC-CO₂和SE方法提取的样品。就植物化学物质含量而言，发现用CPE方法提取的HN米是最好的。
