共查询到17条相似文献,搜索用时 203 毫秒
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对芝麻油料进行微波处理,选择微波功率、微波时间、增湿比例、缓苏时间为影响因素,饼残油率为考察指标,进行单因素实验,再在单因素实验结果基础上,进行正交实验,确定最佳微波条件,最后对比未经微波处理和最佳条件微波处理后所得油脂的品质。结果表明,微波处理能够提高芝麻出油率,且微波处理能够提高油中芝麻素和芝麻林素的含量,但对芝麻油的色泽、碘值、酸值、主要脂肪酸含量影响不大。微波处理后芝麻油的过氧化值会提高,但其含有的芝麻素、芝麻林素等抗氧化物质会使其氧化稳定性提高。微波处理油料可用作油料的预处理。 相似文献
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植物油料的热处理是我国植物油脂制备工艺中必不可少的一个加工环节。在追求安全营养的前提下,适度的植物油料热处理,在降低水分含量、提高出油率的同时,更赋予油脂特征风味、最大限度保留营养素、去除危害物和避免其形成,从而提高油脂的食用价值和商品价值。针对植物油料热处理影响油脂品质的问题,本文综述了植物油料热处理影响油脂氧化稳定性机理的研究进展,同时对植物油料热处理影响油脂氧化稳定性机理尚未研究清楚的困难点进行了总结和分析。旨在对植物食用油脂的适度加工提供一定的参考,对我国植物食用油脂产业的发展提供一定的帮助。 相似文献
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以山东大花生为原料,应用滚筒式微波设备,通过调节其功率及时间,自动旋转翻炒油料,液压冷榨得花生油,对花生的出油率和花生油的酸值、色泽、氧化稳定指数(OSI)、脂肪酸组成、VE含量及风味成分进行分析。结果表明:微波处理有利于提高花生出油率;随着微波功率的增加和微波时间的延长,花生油酸值和色泽增加,但均在国标范围内;微波处理最优条件下(1 000 W,18 min),花生油氧化稳定性最佳(OSI值5.52 h),VE含量最高(344.97 mg/kg),综合感官评定风味最佳,脂肪酸组成及含量无显著变化。 相似文献
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食用植物油脂的安全与生产 总被引:1,自引:0,他引:1
参考欧洲食用油质量指标,针对油料加工中的残溶、胶质、FFA、氧化稳定性、反式酸、聚合物、过氧化值等安全问题,探讨如何改进精炼工艺和相关设备的结构,生产高质量的安全油脂,延长货架期. 相似文献
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微波预处理压榨茶叶籽油及其氧化稳定性 总被引:5,自引:3,他引:2
采用微波预处理压榨法提取茶叶籽油,与烘烤后压榨法在提取率、理化性质和氧化稳定性进行了比较.结果表明,微波预处理压榨茶叶籽油得率比120℃烘烤后压榨得油率高9.6%,为21.81%,油脂提取率为77.5%;微波预处理压榨茶叶籽油的理化性质与60、80℃烘烤后压榨茶叶籽油无明显差异;微波预处理压榨茶叶籽油氧化稳定性高于60℃烘烤后压榨的茶叶籽油,适当升高烘烤温度,压榨茶叶籽油的氧化稳定性升高,当烘烤温度达到120℃时,其氧化稳定性下降. 相似文献
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为了对紫苏籽压榨制油前热处理方式的选取提供参考数据,对紫苏籽进行不同程度的红外或微波热处理,根据热处理后紫苏籽的水分含量分为低、中、高3组,随后进行压榨制油,测定了经不同热处理得到的紫苏籽油的相关理化指标、脂肪酸组成、微量活性成分含量,评估了不同紫苏籽油的DPPH自由基清除率和氧化稳定性。结果表明:两种热处理方式对紫苏籽油脂肪酸组成及含量无显著影响(p>0.05);与未经处理的紫苏籽油相比,经微波热处理的紫苏籽油酸值降低,红外热处理的紫苏籽油过氧化值降低,经过微波和红外热处理的紫苏籽的出油率,油脂的黄酮含量、DPPH自由基清除率和氧化稳定性显著增加(p<0.05);随着红外和微波热处理程度的加深,紫苏籽油中生育酚含量逐渐降低,多酚含量先降低后升高(红外热处理)和先升高后降低(微波热处理)。综上,选取合适的热处理方式及条件可以获得较高品质的紫苏籽油。 相似文献
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介绍分析了不同程度微波预处理对茶籽油出油速率、原料微观结构、油脂主要理化指标、油脂脂肪酸组成等品质的影响。结果表明,微波处理显著提高了油茶籽油出油速率,且对脂肪酸组成和油脂品质产生一定影响。 相似文献
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《Food chemistry》2002,76(1):33-43
Characteristics of oil extracted from hempseeds subjected to microwave treatments were evaluated. Microwave treatment improved oil yield, increased carotenoid and other pigment contents and decreased p-anisidine value without significant changes in other properties. Hempseed oil showed absorbance in the UV-B and UV-C ranges with potential for use as a broad spectrum UV protectant. β-Tocopherol concentrations increased, while the major tocopherol, γ-tocopherol, and fatty acid composition of the oil were unaffected by microwave treatment of hempseed. Hempseed oil showed high kinetic stability during heating and cooling, as characterized by differential scanning calorimetry (DSC). Microwave treatment shifted the melting range of oils to lower temperatures and increased oxidation temperatures, suggesting increased protective effect upon heating. 相似文献
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Efficiency is a key point to ensure the profitability in the production of vegetable oils from oilseeds. To maximize the recovery yields of seed oils, the traditional process involves mechanical expression followed by subsequent chemical extraction using organic solvents (e.g. hexane). Besides health, environmental, and economic related issues to the use of organic solvents, thermal treatment of seeds during conventional oil extraction process inevitably leads to chemical changes (e.g. changes in macronutrients such as protein denaturation/degradation in the meal, oil oxidation, and changes in minor constituents such as fatty acids, sterols, phenolic compounds and tocols). Thus, at this stage of development there is a need for new efficient processes that can improve oil yield and its quality from an economical and environmental point of view. Several research groups have investigated the potential of ultrasounds (US) and microwaves (MW) as additional seed treatments to enhance oil yields and to reduce temperature and extraction times with promising results. The present review is devoted to critically discuss the main findings reported in the literature regarding the feasibility of using US and MW as potential tools to improve oil recovery yields as well as its nutritional, sensorial and physicochemical properties. 相似文献
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采用一次与分段两种收割方式收集油菜籽,在2450 MHz、800 W的微波条件下处理7 min,冷却至室温后低温压榨制油,分析并比较了不同收割方式与预处理方式下菜籽油品质的变化。结果表明,不同收割方式下的菜籽油部分脂肪酸组成、酸价、过氧化值存在显著差异(P<0.05)。与分段收割原料油相比,一次收割原料菜籽油的植物甾醇和维生素E分别高出16.31%和6.56%;总酚降低了36.90%,1,1-二苯基-2-三硝基苯肼(DPPH)自由基清除能力、铁离子还原抗氧化剂能力(FRAP)减少了近50%,最终表现为氧化诱导期(IP)缩短了0.55 h。与对照组相比,微波预处理组维生素E和植物甾醇增加了18.76~19.90和378.25~548.81 mg/kg,Canolol和总酚含量分别增加了595.16~835.77 μg/g和119.24~130.29 mg/100 g,DPPH自由基清除活力、FRAP总抗氧化能力、IP值则提高了20.72~33.13倍、22.98~31.62倍、2.11~2.43倍。微波预处理能有效提高菜籽油中微量成分含量,赋予其更好的氧化稳定性和更高的营养价值。 相似文献
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《Food research international (Ottawa, Ont.)》2006,39(9):945-963
Oilseed proteins and modified or processed oilseed proteins can be incorporated into foods to impart nutritive value and functional properties. Processing of vegetable protein involves physico-chemical and thermal treatments, affecting the nutritional value of the final products, and also the functional properties. Conversely, functional properties (solubility, water and oil retention capacity, foaming capacity and stability, emulsion capacity and stability, viscosity, gelation) influence protein behaviour during processing and storage. These properties can be modified by chemical and enzymatic treatment. Data corresponding to diverse oilseeds and from different deffating and extraction processes have been complied and grouped according to the protein content into meals, concentrates, and isolates. Three groups of technological properties of interest for the formulation of proteinic food products from oilseeds were considered: (i) properties related to hydration mechanisms, (ii) properties related to protein structure and rheology and (iii) properties related to protein surface. 相似文献