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Effects of heat treatment and visible light exposure on the oxidative stability of rice bran and of rice bran oil

机译：热处理和可见光暴露对米糠和米糠油氧化稳定性的影响

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摘要

Rice bran was heated at 120°C for 0 to 30 min to extend the oxidative stability. Also, effects of visible light irradiation on the crude rice bran oil (RBO) from rice bran heated at 120°C for 20 min were studied. As heat treatment time increased from 0 to 30 min, rice bran had significantly high oxidative stability at 40°C for 12 days (p<0.05). Headspace oxygen content in rice bran without heat treatment decreased significantly (p<0.05) whereas those in heat treated rice bran did not change significantly (p>0.05). Results of acid value and conjugated dienoic acid (CDA) confirmed the higher oxidative stability of heat treated rice bran. γ-Oryzanol content was not significantly different among crude RBO during heat treatment and storage (p>0.05). Visible light irradiation caused similar degree of lipid oxidation in crude RBOs from rice bran irrespective of heat stabilization for 48 h, which may be due to the presence of photosensitizers in crude RBO like chlorophylls. This study showed that heat treatment was not effective to enhance the oxidative stability of RBO under visible light irradiation and products containing rice bran should be stored in the dark conditions.
机译：米糠在120°C加热0至30分钟以延长氧化稳定性。此外，还研究了可见光辐照对120℃加热20分钟的米糠中粗米糠油（RBO）的影响。随着热处理时间从0到30分钟的增加，米糠在40°C下具有12天的高氧化稳定性（p <0.05）。未经热处理的米糠中的顶空氧含量显着下降（p <0.05），而经过热处理的米糠中的顶空氧含量没有显着变化（p> 0.05）。酸值和共轭二烯酸（CDA）的结果证实了热处理米糠具有较高的氧化稳定性。在热处理和储存过程中，粗制RBO中的γ-谷维素含量没有显着差异（p> 0.05）。可见光辐照在米糠中的粗制RBO中引起相似程度的脂质氧化，而与48小时的热稳定性无关，这可能是由于粗制RBO中存在光敏剂，如叶绿素。这项研究表明，在可见光照射下，热处理不能有效提高RBO的氧化稳定性，应将含有米糠的产品在黑暗条件下保存。

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