阿魏中阿魏酸的两种提取方法比较及响应曲面优化

探讨超声微波酶解法和超声微波碱解法提取阿魏中阿魏酸的最佳工艺,采用超声微波酶解法和超声微波碱解法,通过分别考察两种方法的单因素,确定其优化条件范围,采用响应曲面实验进一步确定阿魏酸的提取条件。最后通过比较两种方法阿魏酸的提取量,得到阿魏酸的优化提取工艺。结果表明,酶解提取的优化工艺条件是酶解温度70℃、酶解时间30.3 min和酶质量浓度0.23 mg/g,阿魏酸提取量为5.03 mg/g。碱解提取的优化工艺条件是1 g阿魏根粉未加入质量分数1%的NaOH溶液8 mL、提取温度51.8℃和提取时间4.49 min,阿魏酸提取量为8.11 mg/g。因此用超声微波碱解法作为提取方法,提取阿魏酸提取量高,提取效果更佳。     

微波法提取升麻中阿魏酸的工艺研究

采用煎煮法、加热回流法及微波法提取升麻中阿魏酸,对其提取工艺进行比较,确定微波法为最佳提取方法.采用单因素实验和正交实验确定微波法提取升麻中阿魏酸的最佳工艺条件为:乙醇体积分数70%、液料比20:1(mL:g)、微波辐射时间90 s、微波辐射功率385 W,在此条件下,阿魏酸提取率可达0.0593%.     

人参活性物质的提取及人参柔顺洗发水的研制

为优化人参活性物质Rg1、Re、Rb1的提取工艺,研制人参柔顺洗发水,采用L9（33）正交试验表设计人参皂苷的提取工艺,选用药粉目数、溶剂倍量、提取时间为考察因素,以人参皂苷Rg1、Re、Rb1为测定指标筛选最佳工艺参数;结合头发梳理测试,研究人参提取液在洗发水中的最佳添加量。结果发现：人参提取液最佳制备工艺为24目粉末,7倍量水,提取1 h;人参提取液在洗发水中的最佳添加量为15%。可以得出：人参活性物质———皂苷类成分的提取工艺方便且结果可靠,洗发水研制路线全面、合理,可为产业化生产提供实验数据。     

酶法提取米糠中阿魏酸的工艺研究

以脱脂米糠为原料,通过实验探索纤维素酶法提取脱脂米糠中阿魏酸的最佳工艺。结果表明纤维素酶提取脱脂米糠中阿魏酸的最佳工艺为:pH值为4. 5,加酶量25 mg,酶解温度为40℃,酶解时间为5 h为最优条件,阿魏酸得率为18. 64 mg/10 g。该研究为米糠的再利用提供了一种新方法。     

均匀试验设计法提取米糠中阿魏酸工艺优化

使用碱醇提取法从米糠中提取阿魏酸,采用HPLC法检测阿魏酸的含量。设计均匀试验,考察了阿魏酸的提取率与氢氧化钠浓度、提取温度、提取时间、氢氧化钠与乙醇比、固液比的关系,实验表明,阿魏酸最佳提取条件为:用1.3%的氢氧化钠溶液与乙醇按5.6∶1的比例混和,83.2℃下提取2.8 h,固液比为1∶9.4,提取液中加入0.2 g/L的亚硫酸钠溶液作为抗氧化剂,最大提取率为514 mg/100g。     

响应面法优化新疆阿魏中阿魏酸的提取工艺及其抑制酪氨酸酶活性研究

以阿魏酸提取率为指标,在单因素实验的基础上,采用响应面法优化新疆阿魏中阿魏酸的超声波辅助酶法提取工艺,并采用酪氨酸酶多巴速率氧化法评价阿魏酸抑制酪氨酸酶活性。结果表明,新疆阿魏中阿魏酸的最佳提取工艺条件为:酶加量1.4%、料液比1∶13.19(g∶mL)、提取时间10 min、提取温度50.3℃,在此条件下,阿魏酸提取率为2.202%。阿魏酸及新疆阿魏中阿魏酸效应组分均对酪氨酸酶活性具有明显的抑制作用,并呈浓度依赖性的特点。     

正交试验法优选金钱通淋口服液的最佳提取工艺条件

目的；研究金钱通淋口服液提取工艺的最佳条件。方法：以总黄酮含量为测定指标，采用正交试验法，通过统计学分析确定最佳提取工艺条件。结果：药材加10倍量水，煎煮2次，每次2小时为最佳提取条件。结论：本实验为金钱通淋口服液生产工艺提供了最佳条件。     

漆姑草中总黄酮提取工艺研究与含量测定

采用正交实验进行提取工艺优选,研究了漆姑草中总黄酮的提取工艺并测定总黄酮的含量。用芦丁作对照品,硝酸铝做显色剂,测定波长508 nm,紫外分光光度法测定漆姑草中总黄酮的含量。最佳提取工艺条件是：80%甲醇,料液比为1∶20,浸提时间为4 h,提取温度为50℃。最佳工艺条件下,测定漆姑草中总黄酮的含量为11.768%。本提取工艺方法简单、合理,是漆姑草中黄酮类化合物的最佳提取工艺。     

阿魏中阿魏酸的提取方法及抑菌作用研究

研究阿魏中阿魏酸的提取工艺及其抑菌作用。用L9(34)正交试验超声波和微波辅助乙醇提取阿魏酸;用平板打孔法和试管稀释法研究不同质量浓度阿魏酸提取物对3种供试菌的抑菌作用。超声提取的最佳工艺条件是料液比1∶30(g/mL)、超声功率200 W、超声温度50℃和超声时间20 min;在此条件下,提取率达到0.542 mg/g。微波提取的最佳工艺条件是以80%的乙醇为提取溶剂、料液比1∶30(g/mL)、微波功率450 W和微波时间10 min,提取率可达0.556 mg/g。抑菌试验显示优选的微波提取的阿魏酸提取物对大肠杆菌、枯草芽孢杆菌和金黄色葡萄球菌都具有抑制作用。实验结果可为阿魏中阿魏酸提取工艺的确定及在抑菌方面的应用提供实验依据。     

当归中阿魏酸的提取和纯化研究

以当归中主要活性物质阿魏酸的含量为指标,采用单因素及均匀设计实验的方法,确定了微波辅助提取当归中阿魏酸的最优工艺条件:乙醇浓度90%,微波功率850 W,液固比6∶1(mL∶g),辐射时间9 min,粒径大小为2 mm,浸泡时间30 min.结果表明:干浸膏中阿魏酸含量为0.212%,转移率为70.19%,均优于传统加热提取和超声提取方法,而且所用的时间分别是传统加热提取方法和超声提取方法的3/40和3/10.将高速逆流色谱技术应用于上述干浸膏中阿魏酸的分离纯化,经过一次分离得到的阿魏酸纯度为98.2%(HPLC).HSCCC的溶剂系统组成为:正己烷-乙酸乙酯-甲醇-水(3∶7∶5∶5).用核磁共振和质谱表征了所得阿魏酸的化学结构.     

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.     

超临界CO_2和微波辅助萃取当归挥发油

考察当归挥发油的不同提取方法。文中用超临界CO2流体萃取法和微波辅助萃取法研究萃取当归挥发油。实验表明:超临界CO2萃取最佳工艺条件为萃取压力25 MPa、分离釜Ⅰ解析温度55℃、萃取温度45℃,提取率约1.9%;微波辅助萃取最佳工艺条件为无水乙醇为提取溶剂,微波功率800 W、微波辐射时间150 s、液料质量比为4.71∶1,提取率约11.2%。微波辅助萃取法取得当归油的收率高于超临界CO2萃取法。微波辅助萃取法萃取当归挥发油收率高,但外观品质较超临界萃取的当归挥发油差。     

Ultrasonic extraction of ferulic acid from Ligusticum chuanxiong

The extraction of ferulic acid, a pharmacologically active ingredient from the root of Ligusticum chuanxiong, with ultrasonic extraction was investigated. Percolation and supercritical fluid extraction (SFE) were employed to make comparisons with ultrasonic extraction. Three variables, which included the concentration of solvent, the ratio of solvent volume/sample (mL/g), and extraction time, were found to have a great influence on ultrasonic extraction. The optimum extraction was with pure ethanol with a solvent volume/sample ratio 8:1 (mL/g) and extraction time of 30 min. Under the optimum extraction conditions, the extraction yield could reach 8.8% which was higher than that using SFE with ethanol as co-solvent and a content of ferulic acid of 0.7%; both the yield and the content were higher than those obtained by percolation. Ultrasonic extraction significantly shortened the time required for the extraction process. Overall, ultrasonic extraction was shown to be highly efficient in the extraction of ferulic acid from Ligusticum chuanxiong.     

Extraction of ferulic acid from oil palm pressed fiber by a choline chloride based deep eutectic solvent

Results on the extraction of ferulic acid from palm pressed fiber using deep eutectic solvent (DES) of choline chloride-acetic acid (ChCl-AA) and choline chloride-citric acid (ChCl-CA) are reported. Acetic acid was found to be a better hydrogen bond donor to choline chloride than citric acid for the extraction of ferulic acid. Influence of water content in both DES was investigated whereby ChCl-AA and ChCl-CA experienced a drop in viscosity from 9.678 to 1.429 and 22.658 ± 1.655 mm²/s, respectively as the water content in the DES increased from 0 to 50 wt%. The drop in viscosity contributed to higher extraction efficiency in which 41,155 ± 940 mg/kg ferulic acid was obtained after 6 h reflux when ChCl-AA with 30 wt% water was used for the extraction compared to 30,940 ± 621 mg/kg when neat ChCl-AA was used. Further increase in water content in the DES however, did not lead to higher extraction efficiency. Although viscosity of the DES could be improved with the addition of water, there is a threshold where the DES could tolerate the presence of water without changing its solvent behavior. Surface response model revealed that interaction between heating duration and water content in DES, as well as second order effect of both heating duration and water content in DES played important roles in the extraction of ferulic acid from oil palm pressed fiber. The optimum condition for extraction of ferulic acid from palm pressed fiber was heating for 6 h with DES containing 30 wt% water.     

超临界CO_2与微波联用提取香椿芽有效成分

建立了香椿油及总黄酮的超临界-微波联合提取工艺,在超临界CO2萃取香椿油前处理工序的基础上,通过正交实验考察了微波法提取香椿芽总黄酮过程中各操作参数对提取效果的影响,优化后得到的最佳条件为:提取温度70℃,提取每克香椿芽所用溶剂乙醇的体积为12mL,乙醇体积分数50%,提取时间15min,提取3~4次。在该条件下,每克香椿芽可提取总黄酮65.1140~72.9344mg。     

5-溴阿魏酸的合成研究

研究了标题化合物的合成工艺。以N-溴代丁二酰亚胺为溴代试剂,对香草醛进行溴化反应合成5-溴香草醛;以石油醚替代苯作为反应溶剂,5-溴香草醛与丙二酸进行Knoevenagel缩合反应制备标题化合物。二氯甲烷为最佳反应溶剂,通过正交试验确定5-溴香草醛的最佳反应条件:n(香草醛)∶n(NBS)=1∶1.5,CH2Cl2为溶剂,反应时间1.0 h,反应温度为室温。5-溴阿魏酸的总产率75.2%。该方法具有产率高、反应条件温和、时间短、试剂价格低廉及副产物丁二酰亚胺可回收利用等优点。     

高效液相色谱法测定中药洗发水中红景天苷的含量

采用HPLC法测定中药洗发水中红景天活性成分的含量,色谱条件:以十八烷基键合相硅胶为填充剂(150 mm×4.6 mm,5μm);以甲醇-水(15∶85)为流动相,流速1 m L/min,柱温为室温,检测波长275 nm。结果表明,以红景天苷对照品作标准曲线,在0.036~0.396μg范围内线性关系良好(r=0.999 9),加样回收率79.53%。该法简便、灵敏、准确可靠,可用于中药洗发水中红景天苷的含量测定,为制定中药洗发水质量标准提供参考。     

正交实验优化猪胰脏中胰岛素的提取工艺

采用酸醇提取减压浓缩法提取猪胰脏中的胰岛素。以胰岛素的提取含量为考察指标,以提取所用的溶剂、除杂质时的碱化、酸化pH值为考察因素进行正交实验,得出了最佳提取工艺条件为:以丙酮、水、氯化钙为提取溶剂,酸化pH为3.8,碱化pH为8.0除杂。优选得到的工艺稳定可行且提取率最高而杂质含量少。