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首页> 外文期刊>Food Science & Nutrition >The influence of pulsed electric fields and microwave pretreatments on some selected physicochemical properties of oil extracted from black cumin seed
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The influence of pulsed electric fields and microwave pretreatments on some selected physicochemical properties of oil extracted from black cumin seed

机译：脉冲电场和微波预处理对黑孜然种子提取油的某些理化性质的影响

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Application of novel technologies such as microwave and pulsed electric fields (PEF) might increase the speed and efficiency of oil extraction. In the present research, PEF (3.25 kV/cm electric field intensity and 30 pulse number) and microwave (540?W for 180?s) pretreatments were used to study the process of oil extraction from black cumin ( Nigella sativa ) seeds. After applying the selected pretreatments, the oil of seeds was extracted with the use of a screw press and the extraction efficiency, refractive index, oil density, color index, oxidative stability, and chemical components of oil and protein of meal were evaluated. The achieved results expressed that PEF and microwave pretreatments increased the oil extraction efficiency and its oxidative stability. Different pretreatments didn't have any significant influence on the refractive index of black cumin seed oil ( p .05). When microwave and PEF were used, the oil density showed an enhancement as the following: 1.51% and 0.96%, respectively in comparison with the samples with no pretreatments. Evaluation of the extracted oils, using GC/MS analysis indicated that thymoquinone was the dominant phenolic component in the black cumin oil. Finally, the SEM analysis revealed that microwave and PEF can be useful in the extraction of oil from black cumin seeds since these treatments damaged cell walls and facilitated the oil extraction process.
机译：微波和脉冲电场（PEF）等新技术的应用可能会提高采油的速度和效率。在本研究中，PEF（3.25 kV / cm电场强度和30个脉冲数）和微波（540？W持续180？s）预处理被用于研究从黑孜然（Nigella sativa）种子中提取油的过程。进行选择的预处理后，使用螺旋压榨机提取种子油，并评估提取效率，折光率，油密度，色指数，氧化稳定性以及粗粉和粗粉中蛋白质的化学成分。所获得的结果表明，PEF和微波预处理提高了油的提取效率及其氧化稳定性。不同的预处理对黑孜然籽油的折射率没有明显影响（p> .05）。当使用微波和PEF时，与未进行预处理的样品相比，油密度显示出以下增强：分别为1.51％和0.96％。使用GC / MS分析对提取的油进行评估表明，在黑色小茴香油中，胸腺醌是主要的酚类成分。最后，SEM分析显示微波和PEF可用于从黑孜然种子中提取油，因为这些处理方法会破坏细胞壁并促进油提取过程。

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