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| Effects of refining on nutrition and risk indexes of corn germ oil SHANG Gang, DONG Jixuan, YU Hongqi, WANG Wanxiang |
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| DOI：10.12166/j.zgyz.1003-7969/2020.02.004 |
| KeyWord:corn germ oil accurate and moderate processing phytosterol tocopherol squalene 3-MCPDEs glycidyl ester color reversion zearalenone |
| FundProject:“十三五”国家重点研发计划（2018YFD0401102） |
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| Abstract: |
| Corn germ oil was taken as the research object，and the changes of nutrition indexes(phytosterol, tocopherol, squalene) and risk indexes(color reversion, zearalenone, 3-MCPDEs and glycidyl ester) in the crude oil, neutralized oil, bleached oil and deodorized oil produced in the refining process were determined. The results showed that the color reversion of corn germ oil was greatly affected by the content of phospholipids and tocopherols in the crude oil. The neutralization, bleaching and deodorization sections could effectively control the zearalenone content in corn germ oil, while the deodorization section had great effects on nutrition indexes, 3-MCPDEs and glycidyl ester in corn germ oil. According to the experiment results, the actual refining process parameters were adjusted as follows: the neutralization temperature 70-85 ℃, neutralization time not less than 45 min; soft water with chloride ion checked and controlled used in the water washing process, its dosage higher than 8%; citric acid (dosage 100 mg/kg) used for pre-bleaching, bleaching agent used the mixture of activated clay, attapulgite and bentonite, the activity of bleaching clay 120-150, bleaching pressure 2.5-3.5 kPa, bleaching temperature 100-120 ℃, bleaching time 20-30 min; deodorization temperature 235-245 ℃, deodorization time 60-80 min, absolute vacuum not high than 400 Pa (better to keep at 200-300 Pa). The production practice showed that the amount of bleaching agent in the new process was reduced by 20%, the color of the finished product was R1.2, and the color reversion ΔR was reduced from 1.2 of the traditional process to 0.8 of the new process. The retention rates of tocopherol and phytosterol were more than 80%, the removal rate of zearalenone was 86.2%，and the increases of 3-MCPDEs and glycidyl ester reduced. |
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