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混合溶剂提取法从粉末磷脂中分离磷脂酰胆碱的研究 总被引:10,自引:3,他引:10
通过实验探讨了乙腈与低碳醇的混合溶剂用于提取粉末磷脂中磷脂酰胆碱(PC)的可行性。结果表明,混合溶剂在对粉末磷脂中PC的提取率和选择性上,综合性能大大优于单一溶剂。尤其是乙腈-甲醇混合溶剂,当乙腈和甲醇的体积比为4:1时,混合溶剂对PC一次提取的选择性和提取率分别达到72.8%和67.8%,实验结果还显示,溶剂的含水不利于PC的提取。 相似文献
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溶剂法精制磷脂酰胆碱的研究 总被引:4,自引:1,他引:4
为了提高磷脂产品中磷脂酰胆碱(PC)的含量,研究了以浓缩大豆磷脂为原料,采用丙酮和乙醇作溶剂,制备高含量磷脂酰胆碱.用丙酮脱油时,在料溶比为15:200、提取时间15 min、提取温度40℃的最佳脱油工艺条件下,得到丙酮不溶物含量为97.6%的中间产物--粉末磷脂.用乙醇提取富集其中的磷脂酰胆碱,通过单因子试验,研究了粉末磷脂与溶剂的比例、乙醇浓度、提取温度、时间和次数对PC含量和提取率的影响.试验结果表明,在乙醇浓度95%,固液比1:20,提取时间30 min,温度35℃,抽提次数2次的条件下,PC含量和提取率均较优.在最佳试验条件下,PC含量可提高到45.1%,提取率为62.0%. 相似文献
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该研究探讨采用HPLC–ELSD(蒸发光散射检测器)法测定大豆磷脂中磷脂酰胆碱和溶血磷脂酰胆碱含量。结果表明,选用硅胶色谱柱(150 mm×4.6 mm,5μm),磷脂酰胆碱(PC)和溶血磷脂酰胆碱(LPC)分别在0.5 mg/mL~8.0 mg/mL和0.4 mg/mL~6.0 mg/mL范围呈良好线性关系;PC和LPC平均回收率为99.42%和99.83%,相对标准偏差(RSD)分别为1.44%和1.21%。该法对大豆磷脂PC和LPC分析均具有良好精密度和重复性。 相似文献
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建立了油菜磷脂中磷脂酰胆碱的液相色谱分析方法.为了避免流动相在紫外(UV)200~210 nm处有吸收,对磷脂酰胆碱(PC)检测产生干扰,选用蒸发光散射检测器(ELSD)进行油菜磷脂中PC定量分析的研究.采用Alltima Silica 5u,250 mm×4.0 mm色谱柱,流动相为9:1(V/V)的甲醇/乙腈,流速为0.5 mL/min等度洗脱;ELSD检测器漂移温度为70℃,载气流速1.5 L/min,增益1.该法检测PC具有更少的干扰和更高的检测灵敏度,时间更节省,PC在15 min完成分析.在0.2068~1.034 mg/mL范围内,线性相关系数(R~2)为1.00,重复变异系数为1.16%,具有良好的线性关系和重复性,有较好的实用价值. 相似文献
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目的建立正相色谱法测定大豆磷脂中磷脂酰胆碱含量,用于大豆磷脂类保健食品生产过程中该物质含量的测定和质量控制。方法采用硅胶柱(4.6 mm×250 mm,5.0μm)进行分离;色谱条件为流动相:异丙醇:正己烷:蒸馏水=70:16:14(V:V:V),等度洗脱,流速:1.0 m L/min;柱温:40℃;进样量:10μL;检测波长:205nm;并进行方法学验证,考察方法检测限、精密度、回收率等指标。结果磷脂酰胆碱峰面积与其浓度呈良好的线性关系,线性范围为0.1~0.8 mg/m L(r=0.9999),检出浓度0.04μg/m L,检出限为20μg/g,定量限为66.666μg/g,精密度(RSD)为0.6%,平均回收率99.37%(n=9)。结论本文建立的方法灵敏度高,重复性好,且具有很好的专属性,能够应用于大豆磷脂类保健食品中磷脂酰胆碱含量的检测。 相似文献
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In Situ Preparation of Fatty Acid Methyl Esters for Analysis of Fatty Acid Composition in Foods 总被引:6,自引:0,他引:6
Lipid extraction preceding fatty acid methyl esters (FAME) preparation for gas chromatography is time-consuming and cumbersome. We omitted the lipid extraction and performed in situ transesterification (ISTE) by heating lipid-containing foods at 90°for 10 min after adding 0.5N NaOH in methanol for methanolysis and continued heating another 10 min for further methylation after adding 14% BF3 in methanol. FAME prepared by ISTE showed fatty acid composition virtually identical to FAME prepared after lipid extraction from powder, liquid, phospholipid-rich, and tissue products. Due to its simplicity, speed, and reduced organic solvent usage, ISTE should be useful to determine overall fatty acid composition of foods. 相似文献
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以杜仲叶为原料提取绿原酸,将大孔树脂和混合溶剂分相法相结合,对绿原酸进行精制纯化,使绿原酸的纯度达到99.5%(HPLC 法)。在萃取工艺中选定有机溶剂乙酸乙酯为萃取剂,考察萃取时间、pH 值、萃取次数对萃取率的影响,并通过响应面法建立萃取率和萃取时间、pH 值、萃取次数之间的关系,得到最佳萃取工艺 条件为萃取时间4.00min、pH2.97、萃取次数4 次,此时绿原酸萃取率达到95.1%。在分相工艺中,首先对分相剂进行筛选,选定非极性溶剂正己烷为分相剂,再对分相剂的用量进行研究,最终确定其用量为萃取液总体积的40%,绿原酸转移率达93% 以上。 相似文献
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通过对鱿鱼肝脏中鱼油的研究,为鱿鱼及其下脚料的高效利用奠定了理论基础。采用高压蒸煮法和气相色谱/质谱法等技术对鱼油及其脂肪酸成分进行研究。实验得出:加入鱿鱼肝脏1.5倍体积的水,鱼油提取率最高。鱼油精制的条件为:添加体积分数80%磷酸脱胶;采用氢氧化钠脱酸,添加量为粗鱼油的实际酸价来确定;添加量为20%的活性炭脱色;旋转蒸发仪真空处理30min脱腥。经过上述条件处理后的鱼油,色泽为浅黄色、澄清,具有清淡的鱼香味,各项指标均达到了SC/T3502-2000鱼油的一级标准,其中主要物质EPA(16.9%)和DHA(21.2%)。 相似文献
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为开发与利用东北杂豆资源,本文以东北特有杂豆为原料,采用气质分析方法对杂豆脂肪含量及脂肪酸组成进行初步分析。结果表明:杂豆中含有丰富的不饱和脂肪酸,且在测定所有杂豆中均是高活性的n:3、n:2类不饱和脂肪酸含量高,而活性相对的n:1类不饱和脂肪酸含量低。芸豆类杂豆的脂肪酸中不饱和脂肪酸含量均大于80%;且高活性的n:3类不饱和脂肪酸含量较多,紫花芸豆的n:3类不饱和脂肪酸含量达到了48.99%,具有进一步开发应用的价值。本研究为东北杂豆的综合利用提供了理论参考与依据 相似文献
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Calcium salts of high‐oleic sunflower oil (> 86% oleic acid) were prepared and fed at 0% and 7.5% of diet dry matter weight to 8 Holstein cows in early‐ to mid‐lactation in a cross‐over experimental design. Oleic acid content of milk fat increased from 26% to over 40% and cholesterol‐raising saturates were reduced from 41% to 33%. Latin American white cheese, queso blanco, was produced from modified and normal milk. No differences in firmness were found between cheeses using penetration‐compression testing with an Instron machine. Sensory difference tests indicated no significant differences between cheeses. Latin American white cheeses made with high oleic milk are similar to traditional cheese. 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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Abstract: Chlorophyll photosensitized oxidation of W/O emulsion consisting of oils with different fatty acid composition was studied and β‐carotene effects on the singlet oxygen oxidation affected by phosphatidylcholine were evaluated by determining peroxide value (PV) and conjugated dienoic acid (CDA) contents. An emulsion was composed of purified oil (sunflower, soybean, canola, or olive oil), water, and xanthan gum (50:50:0.35, w/w/w) with addition of phosphatidylcholine (0 or 250 ppm) and β‐carotene (0, 1, 5, or 10 ppm). PV and CDA content of oil in the emulsion were increased with time under chlorophyll photosensitized oxidation, and the oxidation rate was higher in the emulsion consisting of sunflower or soybean oil whose polyunsaturated fatty acids content was high compared to canola or olive oil. Addition of β‐carotene to the emulsion significantly decreased the oil oxidation under chlorophyll photosensitization, however, co‐addition of phosphatidylcholine decreased the antioxidant activity of β‐carotene, suggesting an antagonistic antioxidation between them. Practical Application: The results of this study can be applied to the area of emulsion foods such as salad dressing to have improved texture and stability by decreasing the oil oxidation and providing desirable color by use of β‐carotene with phosphatidylcholine as emulsifier. 相似文献