共查询到20条相似文献,搜索用时 125 毫秒
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以乙醇水溶液为溶剂提取紫甘蓝色素,探讨了乙醇浓度、浸提温度、浸提时间、料液比等因素对色素提取率的影响,并采用正交试验方法优化了提取工艺。结果表明:提取的最佳工艺为提取温度55℃、乙醇浓度70%、料液比1︰4、提取时间为60 min,色素含量可达到11.93 mg/g。 相似文献
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以芹菜叶为原料,对芹菜叶中芹菜素的提取工艺进行了优化,并研究芹菜素的抗氧化性能。通过单因素实验,分别考察提取剂、溶剂浓度、料液比、提取温度、提取时间、原料颗粒度等因素对芹菜素得率的影响。在单因素的基础上,设计四因素三水平的正交实验对芹菜叶中芹菜素提取工艺进行优化。研究结果表明,回流提取芹菜素的最佳工艺条件为90%乙醇为提取剂、提取温度为80℃、料液比1:45(g/m L)、提取时间150 min、原料粒径40目,芹菜素的得率为20.675 mg/g。抗氧化活性研究表明芹菜叶中芹菜素提取液对DPPH自由基、超氧阴离子自由基和羟基自由基均有良好的清除能力。 相似文献
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采用响应面法优化赤芝、紫芝孢子粉超声提取工艺。以孢子粉中总三萜得率为评价指标,运用紫外-可见分光光度法,考察溶剂、料液比、提取时间、提取温度、乙醇体积分数5个因素对赤芝、紫芝孢子粉超声提取总三萜的影响,以单因素试验为基础,采用Box-Behnken响应面法优化得到最优提取工艺。赤芝孢子粉超声提取最优方案:提取溶剂为无水乙醇,料液比1∶65(g/mL),提取时间60 min,提取温度42℃;紫芝孢子粉超声提取最优方案:无水乙醇为提取溶剂,料液比1∶50(g/mL),提取时间42 min,提取温度40℃;且二者三萜类成分含量有明显差别。验证实验结果表明,赤芝、紫芝孢子粉中总三萜得率的平均值分别为14.03%、10.20%,与模型预测值的RSD仅为0.94%、1.24%,表明优化所得的提取工艺真实可靠。优化得到的提取工艺操作简单,合理可靠,为赤芝、紫芝孢子粉三萜类成分的进一步研究以及食品药品的开发利用提供理论依据和参考。 相似文献
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采用热水回流提取香樟叶总多糖,考察了提取温度、提取时间、料液比对香樟叶总多糖提取量的影响。结果表明,其最佳工艺条件为:提取温度为85℃,提取时间为4 h,料液比为1∶20,提取次数为4次。在最佳工艺条件下,香樟叶可提取总多糖为129.41 mg/g。 相似文献
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Zhang Shouqin Xi Jun Wang Changzheng 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2005,80(1):50-54
A high hydrostatic pressure extraction (HHPE) method is presented for the extraction of flavonoids from propolis. Various experimental conditions of the HHPE process, such as solvents, ethanol concentration (35–95%, v/v), HHPE pressure (100–600 MPa), HHPE time (1–10 min) and solid/liquid ratio (1:5–1:45 g cm?3), were investigated to optimize the extraction process. The extraction yield with HHPE for 1 min was higher than those using extraction at room temperature for 7 days and heat reflux extraction for 4 h respectively. From the viewpoints of extraction time, the extraction efficiency and the extraction yield of flavonoids, HHPE was more effective than the conventional extraction methods studied. Copyright © 2004 Society of Chemical Industry 相似文献
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桑叶黄酮提取分离方法研究 总被引:2,自引:0,他引:2
研究了从桑叶中提取分离黄酮的方法,探讨了提取剂、料液比、回流时间、回流温度等因素对桑叶黄酮提取率的影响,并通过正交实验对提取工艺进行了优化。实验表明,提取最佳条件为:将原料用超声波预处理40 m in(800 W),以80%的乙醇为提取剂,按料液比1∶8提取,回流温度为70℃,AB-8大孔吸附树脂分离,以乙醇洗脱(洗脱速率为1 BV/h),得率为19.3 mg/g,同时测得黄酮的稳定性良好。本方法具有工艺流程简单、提取率高的优点,适合于工业化生产,为同类研究提供了一定的依据。 相似文献
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香椿叶中总黄酮的提取工艺研究 总被引:2,自引:0,他引:2
研究了溶剂法提取香椿叶总黄酮的工艺条件。在单因素试验的基础上,用正交实验法对香椿叶总黄酮的提取工艺进行优选,考察乙醇体积分数、固液比、提取时间、浸提温度对香椿叶总黄酮提取率的影响。结果表明,在浸提3次条件下,得到叶片总黄酮最佳工艺条件为:乙醇浓度80%、固液比为1∶10(g/mL)、提取温度80℃、提取时间2 h,在此条件下香椿叶片总黄酮提取率为61.13%;叶轴总黄酮最佳提取条件为:乙醇浓度70%、固液比为1∶10(g/mL)、提取温度80℃、提取时间1 h,在此条件下香椿叶轴总黄酮提取率为71.71%。 相似文献
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研究微波预处理-溶剂回流提取马占相思叶多酚的工艺条件。以干马占相思叶粉为原料,用正交实验法对马占相思叶总多酚的微波预处理提取工艺进行优选,考察预处理乙醇浓度、固液比、微波处理时间对马占相思叶总多酚提取量的影响。结果表明,微波预处理溶剂回流提取马占相思树叶总多酚的最佳工艺参数为:润湿乙醇浓度为50%,用量为样品量的2倍,在微波功率800 W条件下处理30 s后,用体积分数70%乙醇在料液比1∶7,水浴温度70℃、自然pH值(pH=6.38)浸提条件下回流提取30 min。在此工艺条件下,可提取总多酚18.013 mg/g马占相思树叶,所得的多酚提取物以总多酚计的清除DPPH自由基的IC50值为39.126 g DPPH/g总多酚。 相似文献
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Suely Pereira Freitas Leopold Hartman Sonia Couri Fany H. Jablonka Carlos W. P. de Carvalho 《European Journal of Lipid Science and Technology》1997,99(9):333-337
This paper describes a new technological process for soybean oil extraction. The process deals with the combined effect of thermoplastic extrusion of beans and the subsequent action of hydrolytic and proteolytic enzymes in aqueous medium to recover the oil, thus, avoiding solvent application. The thermoplastic extrusion is fundamental for the process, because it facilitates the action of enzymes in oil containing cells, reduces the non-hydratable phosphatides and promotes protein denaturation by reducing the emulsion stability and thus enhancing the oil extraction. The main parameters affecting the oil yield are: the temperature and diameter of the die in the extrusion process, the dilution, the concentration of enzymes and the incubation time of the enzymatic treatment. The highest yield was obtained under the following conditions: extrusion of beans at 90°C and exit die of 6 mm, enzymatic incubation time of 6 h, extruded soy/water dilution ratio 1:10 and concentration of enzyme 6%. With these conditions 88% of the oil were obtained after centrifugation. Moreover, the aqueous enzymatic extraction is easier than solvent extraction, and leads to high value products: a solvent-free meal more suitable for human consumption, a protein hydrolysate that can be used as ingredient for liquid foods and an oil of better quality. The non-hydrolyzed meal contains ca 25% of original soybean protein and the residual oil. The protein hydrolysate in the liquid phase contains ca 75% of the total protein in the original grain with a molecular weight below 20 kDa. 相似文献
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白花蛇舌草中总黄酮微波辅助提取工艺研究 总被引:1,自引:0,他引:1
研究了白花蛇舌草中总黄酮的微波辅助提取工艺,在单因素实验基础上,采用正交实验对提取工艺进行了优化。确定出最佳提取条件为:液料比20∶1mL/g、φ(乙醇)=80%、微波时间120s、微波功率400W、微波温度70℃,在此条件下,总黄酮的提取率达3.46%。 相似文献