Abstract
In this study, we evaluated the composition of rice bran stearin (RBS) from various refineries across China. Here, we report the physicochemical parameters of RBS. The slip melting point ranged from 20.8 to 35.3 °C. The free fatty acid content (0.05–0.27 %) and peroxide value (0.34–3.70 mequiv oxygen/kg) was quite low, indicating that the RBS was of good quality. The iodine value ranged from 85.8–102.9 g/100 g, indicating a high unsaturated bond content. There was a significant difference in the unsaponifiable matter content (1.20–3.87 %) among RBS samples. The oxidative stability index (OSI) ranged from 0.56 to 5.85 h. The palmitic acid content in RBS refined by molecular distillation was significantly higher than the RBS that was refined physically and chemically. The major triacylglycerol was LLO/OLL, PLL/LPL, OLO, PLP, OOO and POO (L, linoleic acid; O, oleic acid; P, palmitic acid). RBS contained high levels of micronutrients, including total tocopherols (23.3–117.9 mg/100 g), oryzanol (0.1–2.1 %), and total sterols (682.9–1787.3 mg/100 g). Moreover, three different kinds of solid fat curves were distinguished. The results presented here are probably the first report regarding RBS on an industrial scale, meanwhile the potential utilization of RBS is discussed.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (31401525). We are grateful to Shanghai Kerry Oils and Grains Industries Co., Ltd., Wuxi Zhicheng Food Technology Co., Ltd., Jinjia Oils and Fats Co., Ltd., Xiangrong Oils and Fats Co., Ltd., and Shanxin Grains Co., Ltd. for generously providing the raw materials. We also want to thank Delekang Food Co., Ltd. for supplying the oryzanol standards and raw material.
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Can Shi and Ruijie Liu contributed equally to this work.
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Shi, C., Liu, R., Chang, M. et al. Composition of Rice Bran Stearin from Various Refineries Across China. J Am Oil Chem Soc 93, 869–877 (2016). https://doi.org/10.1007/s11746-016-2814-9
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DOI: https://doi.org/10.1007/s11746-016-2814-9