脉冲电场(PEF)是一种用于辅助提取植物油的创新技术。迄今为止,尚未研究PEF对初榨橄榄油(VOO)质量和抗氧化活性的影响。本研究旨在分析PEF对石油产量的影响,质量,和“Koroneiki”特级初榨橄榄油的体外抗氧化活性。结果表明,PEF处理提高了5.6%的产油率,但对皂化值没有显著影响,VOO的K232、K270和ΔK值。PEF处理使油酸含量降低了3.12%,但对棕榈酸的含量没有显著影响,亚油酸,亚麻酸,花生四烯酸,硬脂酸,油酸,和棕榈酸.PEF治疗后,总酚类物质的含量,总黄酮,橄榄苦苷增加了7.6%,18.3%和76%,分别。对4种酚酸(香草酸,对香豆酸,阿魏酸和肉桂酸),2木脂素(木脂素和芹菜素),羟基酪醇,和3种颜料(叶黄素,退磁叶绿素,和类胡萝卜素)。此外,PEF处理显著增加了生育酚的含量,α,β,γ,δ生育酚增加9.8%,10.7%,13.6%和38.4%,分别。DPPH和ABTS的自由基清除能力也得到了提高。总之,PEF的使用显着提高了VOO油的产量以及总酚的水平,总黄酮,橄榄苦苷,生育酚,和体外抗氧化活性。
Pulsed electric field (PEF) is an innovative technique used to assist in the extraction of vegetable oils. There has been no research on the effects of PEF on virgin olive oil (VOO) quality and antioxidant activity to date. The present study aimed to analyze the effects of PEF on oil yield, quality, and in vitro antioxidant activity of \"Koroneiki\" extra virgin olive oil. The results show that the PEF treatment increased the oil yield by 5.6%, but had no significant effect on the saponification value, K232, K270, and ∆K value of the VOO. PEF treatment reduced the oleic acid content by 3.12%, but had no significant effect on the content of palmitic acid, linoleic acid, linolenic acid, arachidonic acid, stearic acid, oleic acid, and palmitic acid. After PEF treatment, the levels of total phenolics, total flavonoids, and oleuropein increased by 7.6%, 18.3% and 76%, respectively. There was no significant effect on the levels of 4 phenolic acids (vanillic acid, p-coumaric acid, ferulic acid and cinnamic acid), 2 lignans (lignans and apigenin), hydroxytyrosol, and 3 pigments (lutein, demagnetized chlorophyll, and carotenoids). In addition, PEF treatment significantly increased the content of tocopherols, with α, β, γ, and δ tocopherols increasing by 9.8%, 10.7%, 13.6% and 38.4%, respectively. The free radical scavenging ability of DPPH and ABTS was also improved. In conclusion, the use of PEF significantly increased the yield of VOO oil as well as the levels of total phenolics, total flavonoids, oleuropein, tocopherol, and in vitro antioxidant activity.