Gamma oryzanol (γ-oryzanol), a bioactive ingredient in rice bran oil, has potential as a nutraceutical, pharmaceutical, and cosmeceutical. γ-Oryzanol is normally degraded through oxidation by oxygen and sunlight. Microencapsulation is a good alternative to preserve the organoleptic properties, antioxidants and bioactive compounds, and oxidative degradation of γ-oryzanol in rice bran oil. Thus, this study aimed to study and optimize the microencapsulation of rice bran oil by spray drying. The effects of carrier composition (mixtures of maltodextrin (MD) with whey protein concentrate (WPC), from 1 to 4 of MD, or sodium caseinate (NaCas), from 6 to 10 of MD), homogenization pressure (150-300 bar), and carrier to oil ration (1-4) on microencapsulation efficiency and yield, bulk density and moisture content of microcapsules were investigated. To optimize the rice bran oil microencapsulation, a carrier composed of MD and NaCas (8:1), moderate pressures (200–250 bar), and carrier to oil ratios of 3:1 were required. The significant influences of these factors on microencapsulation efficiency and yield were found. Meanwhile, the bulk density and moisture of microcapsules were only affected by carrier mixtures. The results of microencapsulation efficiency and yield of γ-oryzanol that obtained in optimal conditions were 85.23% and 72.12%, respectively. Microencapsulation was a potential method for protection of γ-oryzanol in rice bran oil.
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We acknowledge the support of time and facilities from Ho Chi Minh City University of Technology (HCMUT), VNU-HCM for this study.
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Lai, Q.D., Doan, N.T.T. & Nguyen, T.T.T. Influence of Wall Materials and Homogenization Pressure on Microencapsulation of Rice Bran Oil. Food Bioprocess Technol (2021). https://doi.org/10.1007/s11947-021-02685-0
- Rice bran oil
- Wall material