共查询到19条相似文献,搜索用时 62 毫秒
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以亚油酸含量81.74%的红花油为原料,采用先碱性醇解,后尿素包合的方法。从红花油中富集亚油酸。通过正交试验,确定了尿素一次包合法富集高纯度亚油酸甲酯的最佳工艺条件:混合脂肪酸甲酯:尿素:甲醇为1.04:1:4(W/W/V),包合温度-10℃,包合时间24h,亚油酸甲酯得率72.95%,纯度99.27%。 相似文献
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张霞郝晓丽何静吉日木图 《中国油脂》2020,45(4):9-13
以精炼驼峰油混合脂肪酸(饱和脂肪酸54. 024 3%,单不饱和脂肪酸34. 645 7%,多不饱和脂肪酸4. 645 3%)为原料,在单因素试验基础上,采用响应面法优化尿素包合法富集其不饱和脂肪酸工艺。结果表明:尿素包合法富集驼峰油中不饱和脂肪酸的最佳工艺条件为尿素质量与95%乙醇体积比3∶8、尿素与混合脂肪酸质量比3. 315∶1、包合温度-2. 37℃、包合时间18. 13 h,在此条件下产物碘值(I)为125. 73 g/100 g,产物中饱和脂肪酸含量为7. 802 5%,单不饱和脂肪酸含量为58. 175 6%,多不饱和脂肪酸含量为17. 322 2%。包合后产物为淡黄色黏稠液态,不饱和脂肪酸含量约为75%。 相似文献
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ABSTRACT: The application of conjugated linoleic acid (CLA) as a functional ingredient has been limited due to the high cost of purification and its water-insoluble nature. In this study, high-purity CLA was obtained from safflower oil and a hydrophilic form of CLA was produced by complexation with arginine (Arg). CLA was prepared by alkali-isomerization and purified up to 95% using urea-inclusion crystallization. Total purified CLA comprised 41% and 50% of cis -9, trans -11 and trans -10, cis -12 isomers, respectively, with 35% recovery. Arg was attached to the carboxyl end of CLA. Optimum weight ratio of CLA to Arg was 1.7 and yield was 91%. Arg-CLA complex could expand the scope of CLA application in various food industries. 相似文献
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建立有效的红花籽品质评价方法,筛选发掘红花籽优异资源,为优质红花品种选育及品质改良提供理论基础。以82 份不同产地的红花籽为实验材料,测定红花籽油中的脂肪酸和9 种组分含量,采用隶属函数转化和主成分分析(principal component analysis,PCA)方法,综合评价红花籽油的主要营养品质特征。82 份红花籽油脂肪酸和9 种组分含量各有差异,变异系数在0.98%~111.99%之间;脂肪酸平均含量为22.16~27.23 mg/100 g,亚油酸平均质量分数为78.54%~82.45%。相关性分析发现,脂肪酸与亚油酸(C18:2)和棕榈酸(C16:0)呈显著正相关,与油酸(C18:1n12、C18:1n9)分别呈极显著和显著负相关。PCA将9 个营养组分指标简化为3 个PC因子,PC1包括亚油酸(C18:2)、油酸(C18:1n9)、硬脂酸(C18:0)和二十四烷酸(C24:0);PC2包括棕榈酸(C16:0)和亚麻酸(C18:3);PC3包括油酸(C18:1n12)、二十碳烷酸(C20:0)和二十碳一烯酸(C20:1)。3 个PC贡献率分别为42.721%、30.426%和16.435%,累计贡献率为89.852%。根据各因子隶属函数值和权重,分析红花籽油主要营养品质综合评价排名,筛选出综合品质评价得分靠前的10 份种质:09新疆红花、24云南红花、05四川红花、41辽宁红花、66封丘红花、55卫辉红花、32河北红花、71亳州红花、22延津红花、78江苏红花。 相似文献
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目的:探讨海蓬子籽油亚油酸共轭化产物体外抗肿瘤活性。方法:以含有73.52%亚油酸的海蓬子籽油为原料,利用化学法转化制备共轭亚油酸(conjugated linoleic acid,CLA),采用国标法和小鼠急性毒性实验对共轭化油进行理化指标分析和急性毒性评价,MTT法检测共轭化油对人肿瘤细胞的生长抑制作用。结果:共轭化油中c9,t11-CLA和t10,c12-CLA含量为68.75%,理化指标符合相关产品要求。小鼠急性毒性LD50>20g/kg,属无毒级。共轭化油对食道癌EC109细胞和乳腺癌HTB-22细胞均有较强抑制作用,对宫颈癌HeLa细胞无抑制活性,对正常人胚肾细胞293T无毒性,对EC109细胞的IC50为111.9μg/mL。结论:利用海蓬子籽油转化的共轭亚油酸产物对人肿瘤细胞有较强的生长抑制作用,但其作用具有选择性。 相似文献
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尿素包合法纯化火棘籽油亚油酸与鲨烯工艺 总被引:1,自引:0,他引:1
以火棘籽油为原料,采用尿素包合法对其亚油酸进行纯化,并在此基础上通过柱层析分离出鲨烯。通过单因素试验、正交试验和气相色谱-质谱联用(gas chromatography-mass spectroscopy,GC-MS)分析方法,研究尿素包合过程中包合时间、包合温度及火棘籽油、尿素和乙醇之间的配比等因素对亚油酸纯度和回收率的影响。结果表明:火棘籽油在原料:尿素:乙醇=1:2:6(g/g/mL)、-5℃条件下包合12h,其亚油酸纯度从38.40%提高到68.55%,回收率达72.23%;纯化后的火棘籽油再经柱层析分离得到鲨烯,纯度达98.16%。 相似文献
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Lipase-mediated Acidolysis of Fully Hydrogenated Soybean Oil with Conjugated Linoleic Acid 总被引:1,自引:0,他引:1
J. Ortega A. LÓpez-Hernandez H. S. Garcia C. G. Hill Jr. 《Journal of food science》2004,69(1):FEP1-FEP6
ABSTRACT: Interesterification (acidolysis) of fully hydrogenated soybean oil (melting point = 69.9 °C) with conjugated linoleic acid (CLA) was carried out in a batch reactor at 75 °C. Lipases from Candida antarctica, Rhizomucor miehei, Pseudomonas sp., and Thermomyces lanuginosus were used at 5% (wt/wt) of the total substrate load. The lipase from Rhizomucor miehei produced the fastest reaction rates, and the greatest extent of incorporation of CLA residues in acylglycerols was achieved in 12 h. Lipases from C. antarctica and T. lanuginosus produced slower initial rates, and maximum extents of incorporation of CLA residues were achieved in 24 h. The lipase from Pseudomonas sp. produced the slowest initial rate. The corresponding maximum extent of incorporation was reached in 48 h. Differential scanning calorimetry analysis of the triacylglycerol (TAG) fractions produced by C. antarctica, R. miehei , and T. lanuginosus lipases after purification by solid phase extraction showed little variation in melting point (60.4 °C, 62.8 °C, and 60.1 °C, respectively). By contrast, the corresponding TAG fraction produced by the Pseudomonas sp. lipase melted at 48.4 °C. The positional distribution of the TAGs produced by the lipase from Pseudomonas sp. differed appreciably from those produced by the other enzymes. 相似文献