The enhancement of rice bran oil quality through a novel moderate biorefining process
The enhancement of rice bran oil quality through a novel moderate biorefining process
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DOI：
10.1016/j.lwt.2021.112118
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发表时间：
2021-07
期刊：
影响因子：
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通讯作者：
Daoming Li;Jiahao Zhang;M. Faiza;L. Shi;Weifei Wang;Ning Liu;Yonghua Wang
中科院分区：
文献类型：
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作者：
Daoming Li;Jiahao Zhang;M. Faiza;L. Shi;Weifei Wang;Ning Liu;Yonghua Wang
以米糠为原料，通过适度的生物精炼，获得了富含γ谷维素和植物甾醇，但不含缩水甘油酯(GES)和一氯丙二醇酯(MCPDEs)的食用级米糠油。首先从米皮中提取酸值为51.22 mg KOH/g的高酸RBO，然后结合改进的酶脱胶、脱蜡、酶脱酸、漂白和低温净化(120℃)进行适度的生物精制。通过对精炼过程的监测，结果表明，采用部分甘油脂肪酶SMG1-F278N和磷脂酶A1组合的改良酶法脱胶，经响应面法优化后，磷含量可迅速降至4.56 mg/kg。经过生物精制，制得的RBO酸值和过氧化值分别为0.10 mg KOH/g和2.05 mg/kg，达到食用油一级标准。γ-谷维素和植物甾醇的保留率分别为71.67%和59.2%，未检出GES和MCPDEs。新的温和生物精炼工艺的环境友好性和最终产品的优良产品质量表明，RBO精炼工艺是一种有前途的可行工艺。
Edible grade rice bran oil (RBO) rich in γ-oryzanol and phytosterol but without glycidyl esters (GEs) and monochloropropanediol esters (MCPDEs) was obtained from rice bran by moderate biorefining. High-acid RBO (acid value of 51.22 mg KOH/g) was firstly extracted from rice bran and was then moderately biorefined by combining improved enzymatic degumming, dewaxing, enzymatic deacidification, bleaching, and low-temperature purification (120 °C). Through monitoring the refining process, results showed that the improved enzymatic degumming by combining partial glyceride lipase SMG1-F278N and phospholipase A1enabled the phosphorus content to quickly decrease to 4.56 mg/kg after optimization by response surface methodology. After biorefining, the final RBO with the acid and peroxide value of 0.10 mg KOH/g and 2.05 mmol/kg reached the grade-one standard of edible oil. Additionally, the final RBO contained 20.66 mg/kg γ-oryzanol and 20.63 mg/kg phytosterol with the retention rate of 71.67% and 59.2% but with undetectable GEs and MCPDEs. The environmental friendliness of the novel moderate biorefining process and superior product quality of the final product point toward a promising viable process for RBO refining in the further.