共查询到20条相似文献,搜索用时 250 毫秒
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本文对加晶种的油脂分提进行了初步探讨。提出在分离高熔点组分的油脂分提结晶过程中添加一部分被分提油脂的晶液的方法。 本文叙述了该方法的工艺要点,并且对该方法所用的晶种的形状,结构,数量进行了研究,并在乌桕皮油制取类可可脂的分提方面作了尝试。指出了该方法具有液态油得率较油脂干法分提为高;分提结晶所需时间较短;晶液分离较为容易;分提所需设备较为简单;生产成本较低等优点。 本文试以结晶动力学理论对本文提出的加晶种的油脂分提方法作一解释,并提出该方法在油脂冬化、氢化油、交酯油分提方面应用的可能性。 相似文献
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为使猪油在常温下可呈液态,采用两次干法分提的方法对结晶温度、冷却速率、养晶时间分别进行单因素和正交试验:将猪油加热平衡后以一定的速率冷却至一定的温度,在晶核形成后经过特定的时间进行养晶使晶体形成,最后通过离心法使固液相分离;同时探讨搅拌方式和一次干法分提的平衡温度对分提效果的影响。结果表明:一次分提最佳条件为结晶温度21℃、冷却速率2℃/h、养晶时间14h;二次分提最佳条件为结晶温度16℃、冷却速率0.5℃/h、养晶时间30h;一次分提液化猪油的得率可达81.59%,二次分提液化猪油的得率可达79.93%。经二次干法分提得到的猪油在室温下可呈液态。 相似文献
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M. Leduc M.-P. Létourneau-Montminy R. Gervais P.Y. Chouinard 《Journal of dairy science》2017,100(11):8906-8927
Several experiments were conducted over the past few years to evaluate the feeding value of flax seed and oil in dairy cow diets. The current meta-analysis and meta-regression was undertaken to assess the overall effect of different forms of flax, as a source of trienoic (cis-9,cis-12,cis-15 18:3) fatty acids (FA), on lactation performance and on transfer efficiency of its constituent n-3 FA from diet to milk fat. Comparisons were first conducted with nonsupplemented controls or with diets containing either saturated (mainly 16:0 or 18:0 or both), monoenoic (mainly cis-9 18:1), or dienoic (mainly cis-9,cis-12 18:2) FA. Results indicate that supplementing flax seed and oil decreased dry matter intake, as well as actual and energy-corrected milk yield without affecting the efficiency of utilization of dietary dry matter or energy as compared with nonsupplemented iso-energetic controls. When compared with the other 3 types of dietary fat evaluated, flax rich in trienoic FA supported a yield of energy-corrected milk similar to supplements rich in saturated, monoenoic, or dienoic FA. Greater milk fat concentration and feed efficiency were observed with saturated supplements. However, milk fat concentration and yield were lower with dienoic FA than with flax supplements. Further analyses were conducted to compare the effect of different forms of flax oil, seed, or fractions of seed. Among the 6 categories evaluated, mechanically processed whole seed (rolled or ground) allowed the greatest yield of energy-corrected milk and the best feed efficiency when compared with free oil, intact or extruded whole seed, protected flax, and flax hulls. Feeding protected flax and flax hulls allowed the greatest milk fat concentration of cis-9,cis-12,cis-15 18:3. Moreover, the greatest transfer efficiencies of this fatty acid from diet to milk were recorded with the same 2 treatments, plus the mechanically processed whole seed. These results make this last category the most suitable treatment, among the 6 flax forms evaluated, to combine optimum lactation performance and protection of flax constituent cis-9,cis-12,cis-15 18:3. 相似文献
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溶剂萃取脱酸前后麻疯树籽油脂肪酸组成分析 总被引:3,自引:0,他引:3
用实验方法对脱酸后麻疯籽油中析出白色结晶物现象进行分析,认为该现象是因麻疯树籽油在溶剂中萃取脱酸时,处于分散状态各种脂肪酸在较低温度下(约为5-8℃左右)处于固体脂肪酸和液体脂肪酸熔点之间,固体脂肪酸凝固点高,呈晶体,液体脂肪酸凝固点低,呈液态,脂肪酸组成发生变化所致。用气相色谱法分析萃取脱酸后白色结晶物和液体麻疯籽油脂肪酸组成,有助于麻疯籽油进一步开发利用。 相似文献
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M. Hughes 《Journal of the science of food and agriculture》1969,20(12):745-747
The rate of oil extraction from moist and dry rape seed was compared over an extraction time of 20 h and showed oil to be more readily extractable from oven-dried seed. Three methods of determining the oil content by extraction of single samples were compared with a method in which a number of samples contained in single satchets were extracted in one large extractor. No significant differences were shown between any of the methods used, and it is proposed where sample numbers are large, and oil content is the only analysis required, that the multiple extraction method of oven-dried seed is satisfactorily quick and accurate. 相似文献
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与其他食用油脂相比,籽油新食品原料的不饱和脂肪酸含量更丰富,更受消费者青睐。其中,来源于植物成熟种子的七种籽油新食品原料:杜仲籽油、茶叶籽油、元宝枫籽油、牡丹籽油、盐地碱蓬籽油、水飞蓟籽油和番茄籽油,不仅富含不饱和脂肪酸还含有多种维生素、微量元素和黄酮类物质等活性成分,在食品、医药和化妆品等行业有着广阔的发展前景。本文综述了七种籽油原料的来源情况、提取方法、公示情况、主要营养成分、功能性和安全性研究进展,探讨了籽油新食品原料应用前景,以期为籽油类新食品原料的开发利用提供一定的理论参考。 相似文献
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S. C. ACHINEWHU 《Journal of food science》1982,47(5):1736-1737
Fatty acids, protein and amino acids of African oil bean seed (Pentaclethra macrophylla) and velvet beans (Mucuna uriens) were studied. Crude protein of the defatted seeds were 341g and 196g per kilogram dry matter and the ether extract was 46 and 8%, respectively, for oil bean seed and mucuna. Essential amino acids composition compared fairly with that of isolated soybean protein. Lysine was high at 66.5 and 66.4g/kg crude protein (nitrogen × 6.25) for oil bean seed and mucuna, respectively. Methionine was low but cystine was high. The fat had a high content of saturated fatty acids. It is suggested that the seeds may be a potential source of protein and oil. 相似文献
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薏苡是一种药食同源的谷类作物,原产于我国,种植历史悠久。薏苡仁油是提取自薏苡仁或薏苡仁加工副产物麸皮中的油脂及脂溶性功能成分的混合物。研究表明,薏苡仁油具有降脂、抗癌等作用。综述了薏苡仁油主要成分及其功能性的国内外研究进展,提出了目前存在的不足并展望研究方向,旨在为薏苡仁油综合开发利用及其功能机制的深入研究提供参考。 相似文献
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Yun-Sang Choi Kwaon-Sik Park Hyun-Wook Kim Ko-Eun Hwang Dong-Heon Song Min-Sung Choi Soo-Yeon Lee Hyun-Dong Paik Cheon-Jei Kim 《Meat science》2013
The effects of reducing pork fat levels from 30% to 20% by partially substituting pork fat with a mix of sunflower seed oil (0, 5, 10, 15, and 20%) and makgeolli lees fiber (2%) were investigated based on physicochemical properties, textural properties, and sensory characteristics of reduced-fat frankfurters. The moisture and ash content, and lightness were higher in reduced-fat frankfurter samples containing sunflower seed oil and makgeolli lees fiber than in the control. The results showed that reduced-fat frankfurter samples with higher sunflower seed oil levels had lower redness and yellowness values, as well as less cooking loss, emulsion stability, hardness, springiness, and apparent viscosity. The results of this study show that incorporating sunflower seed oil and makgeolli lees fiber into the formulation successfully reduced animal fat in frankfurters, while improving quality characteristics. 相似文献