黄连中小檗碱的超声波提取工艺

以黄连为原料,研究小檗碱的超声波提取工艺。确定最佳工艺条件为:以乙醇为提取溶剂,超声时间30min、温度50℃、乙醇浓度80%和超声波提取两次。在此条件下,对超声波法提取小檗碱与传统乙醇浸提法进行比较,结果表明,超声波法提取工艺比传统乙醇浸提法小檗碱产量提高了42%。     

黄连中小檗碱盐析法提取研究

文章全面研究了黄连中生物碱小檗碱的提取工艺中各个因素对小檗碱产率的影响,研究了七个因素为浸泡时间,黄连颗粒粒度,稀硫酸浓度,固液比,石灰乳调节pH,HCl调节pH,NaCl用量。得到最优提取条件为:浸泡时间24h,黄连颗粒粒度0.355～0.5mm,稀硫酸浓度0.4%,固液比16倍,石灰乳调节pH=12,HCl调节pH=5,NaCl用量25%。     

正交实验法优化黄连中小檗碱盐析提取工艺

采用正交实验法对黄连中小檗碱盐析提取的浸泡时间、黄连粒度、硫酸浓度、HCl调pH值、石灰乳调pH值及NaCl用量等影响因素进行了优化。确定最优的提取方案为:浸泡时间24 h、黄连粒度0.355～0.5 mm、硫酸浓度0.40%,固液比1∶16、石灰乳调pH值12、HCl调pH值5、NaCl用量25%,在此条件下,小檗碱产率为8.4%、纯度为72.7%。各因素对黄连小檗碱提取效果影响大小依次为:固液比硫酸浓度浸泡时间黄连粒度NaCl用量石灰乳调pH值HCl调pH值。     

小茴香挥发油超声波提取工艺优化及数学模拟

利用超声波法提取了小茴香挥发油,通过正交设计及二次回归方程优化了提取工艺,考察了超声提取时间、温度两个因素对挥发油提取量的影响。结果表明,当采用100g小茴香,超声处理33min,温度51℃时,挥发油提取量达8.78mL。     

不同方法及溶剂对黄连小檗碱的提取效果比较

本文采用3种不同方法,分别以乙醇、丙酮、水作为提取溶剂对黄连小檗碱进行提取.以盐酸小檗碱作为对照,用标准曲线法测定各种溶剂及方法提取液中黄连小檗碱的提取率.实验结果表明:采用回流提取法,提取溶剂为乙醇,黄连小檗碱的提取率达到81%以上,标准偏差为0.0005,相对标准偏差为0.06%     

解吸-内部沸腾两步法提取黄连小檗碱的工艺及机理

采用解吸-内部沸腾两步法强化植物有效成分提取,首先用少量低沸点解吸剂饱和植物组织,以使组织内部的有效成分充分解吸,然后快速加入温度高于解吸剂沸点的溶剂,使植物组织内部的解吸剂迅速被加热至沸腾,强化传质过程. 对黄连中的小檗碱提取实验结果表明,两步法提取2次只需6 min,提取浸膏中小檗碱含量达到53.3%,颗粒度在160~400 mm范围内对提取效果基本没有影响. 热水温度影响实验发现,当内部沸腾发生时提取速度发生突变. 两步法提取黄连不但比传统法优势明显,而且容易实现,应用前景良好.     

石蒜中石蒜碱的超声波提取研究

以野生石蒜为原料,以乙醇为提取剂,研究了石蒜中石蒜碱的超声波法提取工艺条件.通过单因素实验和正交实验确定超声波法提取石蒜中石蒜碱的最佳工艺条件为:超声波功率300 W、提取温度55℃、提取时间2.0h、料液比1∶ 5(g:mL)、提取2次,在此条件下,产率为0.464％、提取率为94.7％.与传统的溶剂法相比,超声波法...     

北美黄连主要生物碱的提取与分离

简述了北美黄连的概况 ,对北美黄连的提取工艺进行了实验研究 ,最后对北美黄连中所含主要生物碱———北美黄连碱和小檗碱进行了几种分离方法和实验研究。原药材用混合溶剂直接提取分离 ,可得到含北美黄连碱 97.7%的结晶体 ,提取率达 6 5% ;提取物经醇水溶解、酸化 ,可直接获得小檗碱盐酸盐结晶 ,纯度达到 99.9% ;用柱色谱法 ,可得到 99.5%的北美黄连碱 ,收率约 1%     

微波-索氏联合工艺提取盐酸小檗碱

采用微波预处理-索氏联合工艺，以盐酸小檗碱粗品收率为指标，考察微波功率、微波处理时间、黄连含水量、粒度、提取溶剂用量、提取时间等因素对盐酸小檗碱的提取收率影响，并与索氏提取方法进行比较。实验结果表明，微波预处理-索氏联合工艺提取效率高，而且无需过滤，工艺简单。     

正交实验法优选黄连中盐酸小檗碱醇提工艺的研究

用乙醇提取黄连中盐酸小檗碱,采用正交实验法优化工艺条件.结果表明,优选的醇提工艺条件为：50％乙醇提取3次,每次提取时间1.5h,3次加醇量分别8,6,6倍.该醇提工艺重现性和稳定性良好.     

超声波提取草莓多糖的工艺研究

本实验利用超声波从草莓中提取草莓多糖,通过单因素试验和L9（34）正交实验研究了超声波浸提时间、超声波功率、料液比、以及超声波浸提次数对草莓多糖含量的影响.实验的结果表明：草莓多糖最佳提取条件为浸提时间20min、超声波功率为60％、料液比1∶50、浸提次数2次,其中浸提时间是最主要影响因素.其次是功率和浸提次数,料液比对提取的影响相对小些.     

Ultrasonic extraction of ferulic acid from Angelica sinensis

In this paper, the extraction of ferulic acid, a pharmacologically active ingredient from the root of Angelica sinensis with ultrasonic extraction was investigated. Percolation and supercritical fluid extraction (SFE) were also employed to make comparisons with ultrasonic extraction. Three variables, which including the concentration of solvent, the ratio of solvent volume to sample (mL/g), and extraction time, were found to have great influence on ultrasonic extraction. The optimum extraction conditions were using pure ethanol with a ratio of solvent volume to sample 8:1 (mL/g) and extraction time of 30 min. Under the optimum extraction conditions, the extraction yield could reach 6.5% mass fraction, which was higher than that of SFE process with ethanol as co‐solvent and nearly a content of ferulic acid 1.0%; both the yield and the content of ferulic acid were higher than those obtained by percolation. Moreover, the time of ultrasonic extraction was significantly shortened. Overall, Ultrasonic extraction was shown to be highly efficient in the extraction of ferulic acid from Angelica sinensis.     

基于优化算法对活性污泥数学模型稳态仿真

活性污泥数学模型No.1(ASM1)涉及的参数多,而且数学模型是非线性的,求解困难.采用非线性优化的方法仿真ASM1,把仿真结果和基准值做了比较.仿真结果证明非线性优化仿真方法可行.     

超声波法从葡萄穗轴废渣中提取白藜芦醇

对用超声波法从葡萄穗轴废渣中提取白藜芦醇的工艺进行了研究。用薄层层析法分离后,用紫外分光光度计测定吸光度,得出白藜芦醇的提取率。考察了不同提取时间、温度、占空比、固液比对白藜芦醇提取率的影响,通过单因素实验和正交实验确定了最佳提取条件：提取剂为体积分数60%的乙醇,超声作用时间为6 min,占空比1∶2,提取温度为70 ℃,固液比为m(葡萄穗轴废渣质量):m(乙醇溶液质量)＝1∶13,白藜芦醇一次提取率达0.33%。     

超声提取杜仲多糖的工艺优化

用水超声提取杜仲皮中多糖,以多糖含量和得率为指标,考察温度、料液比、超声时间、提取次数对提取效果的影响。结果表明,杜仲皮中多糖的最佳提取工艺条件为:60℃,10倍量水,超声提取3次,每次60 min。在此条件下,杜仲皮多糖的得率为1.72%。该工艺生产周期短,耗能低,适于杜仲皮多糖提取。     

Experimental and simulation study of nylon 6 solid–liquid extraction process

The solid–liquid extraction process of nylon 6 to eliminate small molecules, i.e., caprolactam(CL), cyclic dimers(CD) and cyclic trimers(CT), is investigated in detail by both batch extraction experiments and numerical simulations. In the batch extraction experiments, due to the small molecules attaching to the polymeric surface, the basic physical mechanism shifts from surface diffusion to internal diffusion as the extraction proceeded. The experimental data are well reproduced by a diffusion model consisting of two distinct steps, characterized as surface diffusion and internal diffusion. Furthermore, based on the established mass transfer mechanism and diffusion model of the two distinct steps, the equilibrium constants and internal diffusion coefficients of CL, CD and CT are acquired. An industrial countercurrent extraction tower is further simulated. It is found that the extraction efficiency of CL can be significantly improved by increasing the temperature at the bottom portion of the tower. The elimination of CD, which can be greatly promoted by a high-concentration CL-water solution, is controlled by mass transfer resistance, whereas the removal of CL is mainly affected by the equilibrium.