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Some Strategies for Utilization of Rice Bran Functional Lipids And Journal of Oleo Science Copyright ©2018 by Japan Oil Chemists’ Society doi : 10.5650/jos.ess17257 J. Oleo Sci. 67, (6) 669-678 (2018) REVIEW Some Strategies for Utilization of Rice Bran Functional Lipids and Phytochemicals Phumon Sookwong1＊ and Sugunya Mahatheeranont1, 2 1 Rice and Cereal Chemistry Research Laboratory, Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, THAILAND 2 Center of Excellence for Innovation in Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, THAILAND Abstract: Rice bran contains a great amount of functional lipids and phytochemicals including γ-oryzanols, tocotrienols, and tocopherols. However, utilization of those compounds is limited and needs some proven guidelines for better implementation. We introduce some effective strategies for the utilization of rice functional lipids, including an introduction of pigmented rice varieties for better bioactive compounds, bio- fortification of rice tocotrienols, plasma technology for improving rice phytochemicals, supercritical CO2 extraction of high quality rice bran oil, and an example on the development of tocotrienol-fortified foods. Key words: rice, pigmented rice, phytochemicals, functional lipids, antioxidants 1 Introduction tant role in reducing plasma lipid and lipoprotein Rice（Oryza sativa）is one of the most important crops cholesterol concentrations7）. T3s fight cancer cells by tar- in the world with more than half of its population consum- geting multiple cell signaling pathways8）. Polyphenols, ing rice as their main energy source. More than 700 million vitamin E and carotenoids help prevent oxidative damage metric tons of rice is being produced annually worldwide1）. to DNA and other tissues9）. The standard of rice production in regards to quality im- Despite their health advantages, rice bran functional provement of product in order to promote health and lipids are hardly consumed on a daily basis because rice welfare has therefore been encouraged profoundly. bran is largely separated from white rice during commer- When considering nutritional values of whole rice grains, cialized polished-rice manufacturing（Fig. 1）. Instead, the the endosperm part of white rice is made up of mainly rice bran is separated as by-product and used wastefully as starch（carbohydrate）, whilst rice bran is a combined layer cattle and poultry feed. However, as rice bran has gained of pericarp, seed coat, nucellus, aleurone layer, and some- increasing interest for its health prospects, it has been en- times embryo, hence it contains a good source of proteins, couraged to use rice bran as a natural source of functional lipids, dietary fiber, and useful minerals2）. Non defatted phytochemicals for production of nutraceutical, pharma- rice bran is composed of 18-22％ triacylglycerols, and the ceutical and cosmeceutical products as reported previous- unsaponifiable lipids in rice bran are mainly comprised of ly10－12）. γ-oryzanols, tocotrienols（T3s）, and tocopherols（Tocs）3）. Therefore, in this review, we introduce some effective Other phytochemicals, which are found in a lesser concen- strategies for the utilization of rice functional lipids for tration, include carotenoids, lecithin, long-chain alcohols, health purposes. The content includes an introduction of flavone, squalene, and polycosanols4）. Flavonoids in rice pigmented rice varieties for better phytochemicals, bio-for- bran are classified as flavones, flavonols, flavanols（flavan- tification of rice T3s, plasma technology for improving rice 5） 3-ols）, flavanonols, isoflavones, and flavanones . The bio- antioxidants, supercritical CO2 for extraction of high active components in lipid fraction are known to have quality rice bran oil, and an example on the development many health benefits including anti-oxidative, neuroprotec- of T3-fortified foods. tive, anti-hypercholesterolemic, and anti-angiogenic prop- erties6）. For instance, rice bran γ-oryzanols play an impor- ＊Correspondence to: Phumon Sookwong, Rice and Cereal Chemistry Research Laboratory, Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, THAILAND E-mail: [email protected] Accepted January 18, 2018 (received for review November 30, 2017) Journal of Oleo Science ISSN 1345-8957 print / ISSN 1347-3352 online http://www.jstage.jst.go.jp/browse/jos/ http://mc.manusriptcentral.com/jjocs 669 P. Sookwong and S. Mahatheeranont Spikelet specifically for the Emperor and the royal family, and were forbidden to regular people who were not allowed to be Haret anywhere near the stuff. Previous research showed that the pigments of rice Pedical Paddy rice mainly belonging to anthocyanin compounds consists of predominant peonidin-3-glucoside（P3G）and cyanidin- Dehusking proces 3-glucoside（C3G）16）, while minor anthocyanins are cyani- din-3,5-diglucoside, cyanidin-3-rutinoside, malvidin-3-glu- Husk Brown ice coside, petunidin-3-glucoside, cyanidin-dihexoside, cyanidin-3-gentiobioside, cyanidin-3-rutinoside, and cyani- Polishing proces din-3-sambubioside17－19）. Besides those anthocyanins, other major functional compounds are γ-oryzanols, gallic bran Wh rice acid, protocatechuic acid, hydroxybenzoic aicd, p-coumaric (ran bryo) (mmercial whit ri product) acid, ferulic acid, sinapic acid, flavan-3-ol（＋）catechin and 20） Air searator （－）epicatechin, flavanols（flavan-3-ols） . A report by Steam cooking drying Sriseadka et al. evidenced that flavonoids in pigmented Solent etraction rice varieties differed from that of white rice21）. Among eleven flavonoids detected, there were six flavonoids found Crud b oil for the first time in rice bran including taxifolin-7-O-gluco- Degumming side, myricetin-7-O-glucoside, isorhamnetin-3-O-acetylglu- etralizing with aOH coside, isorhamnetin-7-O-rutinoside, 5,6,3′,4′,5′-pentahy- Bleaching droxyflavone-7-O -glucoside, and 5,3 ,4 ,5 - Dewaing ′ ′ ′ b wax tetrahydroxyflavanone-7-O-glucoside. The predominant Deodorizing glycoside derivatives of flavonoids were quercetin-3-O-glu- Deodorizer distillate coside, isorhamnetin-3-O-glucoside, and isorhamnetin-3-O- Winterizing glucoside21）. A number of physiological studies regarding bioactive Refined b il compounds from pigmented rice have been conducted, in Fig. 1 Manufacturing flow chart of commercial white rice which sterols, γ-oryzanols, Tocs, T3s, and phenolic com- products and commercial refine rice bran oil. pounds were extracted from pigmented rice bran22）. For instance, supplementation of highly pigmented rice bran 2 P igmented rice as a superior source of physiologically oil could ameliorate oxidative stress and histological active compounds changes in streptozotocin-induced diabetic rats fed with Differences in chemical and physical characters among high-fat diet23）. Pigmented rice bran could inhibit various kinds of rice are owned to their great diversifica- α-amylase and α-glucosidase activity, resulting in the de- tion of rice plant variety around the world. A previous laying of digestion and absorption of carbohydrates24）. This study reported different starch and sugar content as well could lead to the suppression of postprandial hyperglyce- as different physical properties in different rice samples13）. mia in diabetic patients24）. A study by Ling et al.（2002） This implied that the amount and type of functional com- demonstrated that supplementation of the black rice pounds in different kinds of rice differed. Variation of phe- extract to rabbits could decrease formation of atheroscle- nolic constituents and antioxidant properties of some vari- rotic plaque and improve antioxidative status25）. Anti-aller- eties of Indian rice were also demonstrated14）. These gic activity was also evidenced when pigmented rice bran findings suggested that the variety of rice was another im- extracts in in vitro cell assays as reduction in tumor ne- portant parameter to consider for the effective use of rice crosis factor（TNF）-α, interleukin（IL）-1β, IL-4, and IL-6 functional phytochemicals for health purposes. mRNA expressions was observed in RBL-2H3 cells26）. Anti- Pigmented rice varieties, by definition, are rice varieties inflammatory activity was also reported as a result of the that have colors（pigments）other than the white color of red rice polar extract fraction exerting anti-inflammatory ordinary white rice. The pigment is generally red, blue, activities by inhibiting the production of TNF-α, IL-6, and brown, purple or black color appearing on the bran or/and NO in LPS-activated macrophages27）. Pigmented rice endosperm of rice. Recently, these kinds of pigmented rice extract could perform anti-cancer activity due to its high have become increasingly popular around the world, espe- cytotoxicity to human hepatocellular carcinoma HepG2 cially in Asian countries like China, India and Thailand15）. cells28）, and displayed anti-mutagenic effects against AFB1 In China, pigmented rice is sometimes called forbidden rice in the Ames test29）. originated from ancient China. Black rice was set aside On the basis of those findings, pigmented rice variety 670 J. Oleo Sci. 67, (6) 669-678 (2018) Some Strategies for Utilization of Rice Bran Functional Lipids and Phytochemicals should therefore be considered as an attractive dietary According to the screening result, T3-rich variety source rich in physiologically active compounds suitable （Milyang23）was found high in T3 content（166％ to the for application in health promotion. standard Koshihikari）. Consequently, cross-breeding between the high T3-rich variety and Koshihikari was
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