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| Effects of crude oil quality and refining process on comprehensive quality of Cyperus esculentus oil |
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| KeyWord:Cyperus esculentus oil crude oil quality oil refining comprehensive quality |
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| Abstract: |
| In order to provide support for the quality control of Cyperus esculentus oil refining process, two samples of Cyperus esculentus crude oil with different quality were degummed by hydration, deacidified by alkali refining, bleached by adsorption and deodorized by distillation. The quality index, composition of fatty acid and glyceride, and nutrient content of Cyperus esculentus oil in the refining process were detected, and the influence of crude oil quality and refining process on the comprehensive quality of Cyperus esculentus oil was analyzed. The results showed that although the acid value of two different qualities of Cyperus esculentus crude oil was significantly different (2.03 mgKOH/g and 12.21 mgKOH/g respectively), the acid value (0.16 mgKOH/g and 0.33 mgKOH/g respectively) and peroxide value (both 0.01 g/100 g) after refining were significantly better than those in LS/T 3259-2018 Cyperus esculentus oil. During refining, the phospholipid content decreased from 6 874.10 mg/kg and 312.29 mg/kg to 88.61 mg/kg and 88.28 mg/kg respectively, and the removal rates were 98.71% and 71.73% respectively. The fatty acid composition and content of Cyperus esculentus oil did not change obviously, and the triglyceride content in glyceride composition increased (from 98.46% and 97.68% to 98.74% and 98.06%, respectively), but the change was not significant. Total sterol content decreased from 220.21 mg/kg and 253.44 mg/kg to 175.14 mg/kg and 182.33 mg/kg, respectively. Polyphenol content decreased from 26.38 mg/kg and 88.65 mg/kg to 8.45 mg/kg and not detected, respectively. The vitamin E content decreased from 225.91 mg/kg and 177.33 mg/kg to 180.01 mg/kg and 13.09 mg/kg, respectively. After refining, the quality indexes of Cyperus esculentus oil with different crude oil quality can meet the industry requirements, but the beneficial companion loss of Cyperus esculentus crude oil with high acid value is great during refining. |
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