共查询到20条相似文献,搜索用时 62 毫秒
1.
2.
3.
正交试验法优选药用菊花的总黄酮提取工艺 总被引:1,自引:0,他引:1
采用超声提取的方法,通过正交试验确定杭菊、贡菊、野菊的最佳提取条件,比较其总黄酮的含量.实验结果表明,贡菊中的总黄酮含量最高,野菊其次,杭菊最低.它们的提取最佳条件如下:贡菊超声时间90 min、乙醇体积分数60%、液料比(mL∶g)45∶1;野菊超声时间90 min、乙醇体积分数45%、液料比(mL∶g)45∶1;杭菊超声时间90 min、乙醇体积分数45%、液料比(mL∶g)40∶1.在最佳提取条件下进行了4次验证实验,相对标准偏差在0.8%以下. 相似文献
4.
5.
6.
以柚子皮为原料,在超声条件下,研究了料液比、浸提pH值、水浴加热温度、超声提取时间四个因素对果胶提取率的影响。并通过正交试验确定了最佳的提取工艺参数。用提取得到的果胶制作了软糖。结果表明:四个因素对果胶提取的影响顺序为料液比水浴加热温度超声提取时间浸提pH值。最佳提取工艺参数为:料液比1∶20(g∶mL),浸提pH值为1,水浴加热温度为85℃,超声提取时间为40 min。该条件下柚子皮果胶的提取率为11. 68%。用果胶3 g,白砂糖15 g,葡萄糖20 g,柠檬酸0. 3 g,椰果粒5 g的配方制作出的软糖,口感、软硬度、弹性都较好,为柚子皮的开发利用提供了依据。 相似文献
7.
超声波强化提取荠菜中总生物碱的研究 总被引:5,自引:0,他引:5
采用超声波辅助提取法提取荠菜中总生物碱,考察了提取剂、料液比、提取时间、提取温度、超声波功率对生物碱提取率的影响.正交实验结果表明超声法的最佳提取条件为:乙醇体积分数为70%,料液比为1∶10,提取时间10 min,提取温度50℃,功率160 W. 相似文献
8.
9.
10.
11.
M. H. I. Baird 《加拿大化工杂志》1991,69(6):1287-1301
The solvent extraction area is perceived by some chemical engineers as being mature and fully developed. The present review shows that this is not the case. Many chemical engineering problems must be solved before equipment can be confidently designed from first principles. The review also outlines progress in extraction process chemistry, and in new techniques such as membrane extraction. 相似文献
12.
13.
A mathematical model has been developed to simulate and predict the dynamic behavior of liquid extraction counter current operations in mixer-settler units. Murphree efficiency has been included in the model. The behavior of a multistage glass mixer-settler has been studied under start-up transient conditions. Very good agreement between the simulation results and the experimental findings have been obtained. The simulation results showed that this model can efficiently be used to determine the optimum number of stages, the capacity of each stage, the phase ratio and the time required for each unit to attain steady state conditions. Other controlling parameters in operating such units are investigated. 相似文献
14.
15.
张文兵 《化学推进剂与高分子材料》2004,2(4):47-48
根据生产实践,总结蒽醌法生产双氧水中影响萃余液中双氧水含量的各种因素,指出萃余液中H2O2超标的危害,找到控制萃余的有效途径。 相似文献
16.
番茄红素含量测定中提取方法研究 总被引:1,自引:0,他引:1
采用紫外一可见分光光度法测定番茄酱中番茄红素的含量。在提取时间,提取次数,提取剂的选择等方面考察了影响番茄红素测定效果。试验结果表明:影响番茄酱中番茄红素的提取因素主次顺序为:料液比〉混合液〉提取时〉间提取次数:采用乙酸乙酯+乙醇(9+1)做提取剂,料液比为1:2,提取时间为30min.提取次数为1次,为番茄酱中番茄红素测定提取的最优组合。 相似文献
17.
18.
竹叶黄酮提取分析方法的研究及其新进展 总被引:2,自引:0,他引:2
从竹叶黄酮的基本性质着手,根据其溶解性,显色反应等特性,选取适当的提取方法。综述了五种应用较广泛的提取新方法、新技术,及分析方法,并简要论述了各种新技术和方法的原理以及应用于竹叶黄酮工业生产方面的情况。 相似文献
19.
Lorenzo RA Carro AM Alvarez-Lorenzo C Concheiro A 《International journal of molecular sciences》2011,12(7):4327-4347
Template removal is a critical step in the preparation of most molecularly imprinted polymers (MIPs). The polymer network itself and the affinity of the imprinted cavities for the template make its removal hard. If there are remaining template molecules in the MIPs, less cavities will be available for rebinding, which decreases efficiency. Furthermore, if template bleeding occurs during analytical applications, errors will arise. Despite the relevance to the MIPs performance, template removal has received scarce attention and is currently the least cost-effective step of the MIP development. Attempts to reach complete template removal may involve the use of too drastic conditions in conventional extraction techniques, resulting in the damage or the collapse of the imprinted cavities. Advances in the extraction techniques in the last decade may provide optimized tools. The aim of this review is to analyze the available data on the efficiency of diverse extraction techniques for template removal, paying attention not only to the removal yield but also to MIPs performance. Such an analysis is expected to be useful for opening a way to rational approaches for template removal (minimizing the costs of solvents and time) instead of the current trial-and-error methods. 相似文献