姜黄中姜黄素的提取研究

以总姜黄素含量为考察指标,采用正交设计优化乙醇法提取姜黄中姜黄素,用分光光度法对姜黄素提取液总姜黄素含量进行检测。考察了料液比、浸提时间、温度、乙醇浓度等因素对提取量的影响。结果表明:在30℃时,乙醇浓度70%、料液比1∶28、浸提时间2 h提取率最高,该提取条件下提取工艺合理、科学。     

郁金药材中姜黄素类成分含量测定方法研究

为开展郁金药材中姜黄素类成分的研究,确立了姜黄素的优化提取条件,建立了姜黄素的高效液相色谱含量测定方法。结果表明,以60%乙醇回流,15倍药材溶剂量,提取时间1 h,提取次数1次对姜黄素的提取较完全;姜黄素在0.02648~0.26480μg范围内线性关系良好;精密度、稳定性和重复性的RSD均小于2%,平均加样回收率为99.73%,RSD为1.41%。     

蒙药诃子中总黄酮的提取方法比较及工艺优化

对蒙药诃子中总黄酮的提取方法进行对比研究,并优化最佳提取工艺条件。以诃子中总黄酮的含量为指标,比较浸渍提取法、回流提取法、超声辅助法和微波辅助法,通过正交试验优化微波辅助法的提取工艺。结果表明,微波辅助法优于浸渍提取法、回流提取法和超声辅助法;微波辅助法提取诃子中总黄酮的最佳提取条件如下:乙醇浓度70%,料液比1∶40,微波功率300 W,提取时间40 s,在该条件下,提取诃子总黄酮的含量为9.65%。本文为蒙药诃子总黄酮的提取提供了一种快速高效、节能环保的方法。     

微波辅助提取-HPLC测定决明子中的5种蒽醌类化合物

通过微波辅助提取法与索氏提取法、超声提取法的比较研究和优化,确定提取决明子中蒽醌类化合物的最佳工艺.采用HPLC测定决明子提取液中芦荟大黄素、大黄酸、大黄素、大黄酚和大黄素甲醚5种蒽醌类化合物的含量.结果显示微波辅助提取法效率最高,在乙醇浓度为80%,料液比为1∶50,升温速率8℃/min,于100℃提取15 min时5种蒽醌类化合物的平均回收率为97.0%,RSD均小于1.8%.     

微波辅助法提取香根净油的研究

采用微波辅助法提取香根净油,通过实验确定了最佳提取工艺条件。研究结果表明,最佳提取工艺条件为：提取液中乙醇体积分数为80%,固液比1∶10（g/mL）,微波频率2450MHz,功率1190W,微波时间5min。最佳提取工艺条件下香根净油提取率为6.41%。     

郁金药材中姜黄素类成分含量测定方法研究

开展了郁金药材中姜黄素类成分的含量测定的研究,确立了姜黄素的优化提取条件,建立了姜黄素的高效液相色谱含量测定方法。通过筛选,发现以60％乙醇回流,15倍药材溶剂量,提取时间1h,提取次数1次对姜黄素的提取较完全。姜黄素在0．0265～0．2648μg范围内线性关系良好。精密度、稳定性和重复性的RSD均小于2％,平均加标回收率为99。73％,RSD为1．41％。     

纤维素酶预处理法提取郁金中姜黄素的研究

提出了纤维素酶预处理法提取郁金中姜黄素的新工艺。探讨了酶的用量、酶解时间、酶解pH值、酶解温度、提取次数、提取时间等因素对姜黄素提取率的影响。筛选出了最佳的单因素工艺条件为:每10g郁金粉纤维素酶的用量为180U、酶解时间120min、pH值3.5、温度50℃、提取次数2次、提取时间90min。与传统提取方法相比,该方法及其新工艺能显著提高姜黄素的提取率。     

重庆地区柚皮中黄酮类化合物的提取工艺研究

以重庆地区柚皮为原料,采用超声波辅助法对重庆地区柚皮中黄酮类化合物的提取工艺进行了研究,利用紫外分光光度法测定提取液中的黄酮类化合物的含量,其最佳提取工艺条件为:超声波提取时间为1 h,固液比为1∶20(g·m L-1),乙醇体积分数为65%,溶液p H值为7.0,黄酮类化合物的提取率达0.598%。     

柴胡中柴胡皂甙a的超声辅助溶剂提取

以溶剂提取法为基础,以超声波为辅助手段,对柴胡中的有效成分进行了提取.通过对提取液中柴胡皂甙a量的测定,研究了超声功率、提取温度、提取时间和样品浸渍时间等条件对提取效果的影响,优选出超声辅助溶剂提取的最佳条件为超声功率50%、提取温度50 ℃、提取时间20 min、样品浸渍时间24 h.实验结果表明,超声辅助溶剂提取比普通的溶剂提取具有更高的提取效率.     

姜黄素的提取方法研究

借助微波辅助手段,加入新制的系列咪唑类离子液体(ILs),利用正交法设计实验并优化了不同因素水平下生姜中姜黄素的提取工艺,利用其对1,1-二苯基-2-三硝基苯肼(DPPH)的清除率检测了姜黄素的抗氧化性.最佳提取工艺条件为:离子液体(溴化1-甲基-3-正癸基咪唑)浓度为1.5mol·L~(-1),乙醇体积分数为80%,料液比为1∶15,微波功率为165 W,微波时间为20 min,最终提取率为0.426%.此条件下姜黄素对DPPH自由基的清除率为65.07%,IC50为52.8μg·L~(-1),表明姜黄素有较强的抗氧化性.     

姜黄中姜黄素的提取及电化学测定

姜黄中大约含有1%～3%的姜黄素,用95%乙醇从姜黄中浸取姜黄素,超声场介入下浸取的浸取速率最快.在0.2 mol/L磷酸盐缓冲溶液中（pH3.3）,姜黄素于玻碳电极上存在可逆的单电子转移过程,据此本实验首次建立了以线性扫描溶出伏安法检测姜黄素含量的新方法.在-0.2 V（vs SCE：饱和甘汞参比电极）电位下,含姜黄素的电解液于玻碳电极上经过富集,可得到一灵敏的氧化峰,峰电位Epa为＋0.464 V.在最佳条件下,氧化峰峰电流Ip与姜黄素浓度在8.0×10^-9～4.0×10^-7mol/L范围内呈线性关系,最低检出限为2.0×10^-9mol/L.本法操作简单、快速、灵敏、准确,可用于药物中姜黄素含量的直接测定.     

Preparation of novel curcumin‐imprinted polymers based on magnetic multi‐walled carbon nanotubes for the rapid extraction of curcumin from ginger powder and kiwi fruit root

A novel molecularly imprinted polymer based on magnetic phenyl‐modified multi‐walled carbon nanotubes was synthesized using curcumin as the template molecule, methacrylic acid as the functional monomer and ethylene glycol dimethacrylate as the cross‐linker. The phenyl groups contained in the magnetic imprinted polymers acted as the assisting functional monomer. The magnetic imprinted polymers were characterized by scanning electron microscopy, Fourier‐transform infrared spectroscopy and vibrating sample magnetometry. Adsorption studies demonstrated that the magnetic imprinted polymers possessed excellent selectivity toward curcumin with a maximum capacity of 16.80 mg/g. Combining magnetic extraction and high‐performance liquid chromatography technology, the magnetic imprinted polymer based on magnetic phenyl‐modified multi‐walled carbon nanotubes was applied for the rapid separation and enrichment of curcumin from ginger powder and kiwi fruit root successfully.     

Rapid measurements of curcumin from complex samples coupled with magnetic biocompatibility molecularly imprinted polymer using electrochemical detection

Curcumin widely exists in food, and rapid selective and accurate detection of curcumin have great significance in chemical industry. In this experiment, a new magnetic biocompatibility molecularly imprinted polymer was prepared with nontoxic and biocompatible Zein to adsorb curcumin selectively. The polymer has high biocompatibility, good adsorption capacity, and specific adsorption for curcumin. Combined with portable electrochemical workstations, the polymer can be used to detect curcumin rapidly and cost‐effectively. Using curcumin as a template and Zein as the crosslinking agent, the polymers were synthesized on the surface of Fe₃O₄ particles for solid phase extraction. The experimental results showed that the polymer reached large adsorption capacity (32.12 mg/g) with fast kinetics (20 min). The adsorption characteristic of the polymer followed the Langmuir isotherm and pseudo‐second‐order kinetic models. Hexacyanoferrate was used as electrochemical probe to generate signals, and the linear range was 5–200 µg/mL for measuring curcumin. The experimental analysis showed that the polymer was an ideal material for selective accumulation of curcumin from complex samples. This approach has been successfully applied to the determination of curcumin in food samples with electrochemical detection, indicating that this is a feasible and practical technique.     

采用超临界CO_2萃取技术提取废次烟叶中的茄尼醇

采用超临界CO2萃取技术提取废次烟叶中的有效成分茄尼醇,以乙醇为夹带剂,研究了萃取压力、萃取温度、CO2的流量、萃取时间、夹带剂的使用、分离温度和原料粒度等方面对萃取效果的影响,并对其中影响较为显著的因素进行了正交试验,通过极差和方差分析确定了萃取体系适宜的工艺条件。萃取压力为20 MPa,萃取温度为45℃,CO2的流量为15 L/h,萃取时间为2 h,夹带剂为95%的乙醇,分离温度为40℃,原料粒度为40~60目。     

Cold column trapping-cloud point extraction coupled to high performance liquid chromatography for preconcentration and determination of curcumin in human urine

A cold column trapping-cloud point extraction (CCT-CPE) method coupled to high performance liquid chromatography (HPLC) was developed for preconcentration and determination of curcumin in human urine. A nonionic surfactant, Triton X-100, was used as the extraction medium. In the proposed method, a low surfactant concentration of 0.4% v/v and a short heating time of only 2 min at 70 °C were sufficient for quantitative extraction of the analyte. For the separation of the extraction phase, the resulted cloudy solution was passed through a packed trapping column that was cooled to 0 °C. The temperature of the CCT column was then increased to 25 °C and the surfactant rich phase was desorbed with 400 μL ethanol to be directly injected into HPLC for the analysis. The effects of different variables such as pH, surfactant concentration, cloud point temperature and time were investigated and optimum conditions were established by a central composite design (response surface) method. A limit of detection of 0.066 mg L⁻¹ curcumin and a linear range of 0.22–100 mg L⁻¹ with a determination coefficient of 0.9998 were obtained for the method. The average recovery and relative standard deviation for six replicated analysis were 101.0% and 2.77%, respectively. The CCT-CPE technique was faster than a conventional CPE method requiring a lower concentration of the surfactant and lower temperatures with no need for the centrifugation. The proposed method was successfully applied to the analysis of curcumin in human urine samples.     

Analysis of volatile secondary metabolites from Colombian Xylopia aromatica (Lamarck) by different extraction and headspace methods and gas chromatography

Hydrodistillation (HD), simultaneous distillation-solvent extraction (SDE), microwave-assisted hydrodistillation (MWHD), and supercritical fluid (CO2) extraction (SFE), were employed to isolate volatile secondary metabolites from Colombian Xylopia aromatica (Lamarck) fruits. Static headspace (S-HS), simultaneous purge and trap (P&T) in solvent (CH2Cl2), and headspace (HS) solid-phase microextraction (SPME) were utilised to obtain volatile fractions from fruits of X. aromatica trees, which grow wild in Central and South America, and are abundant in Colombia. Kováts indices, mass spectra or standard compounds, were used to identify more than 50 individual components in the various volatile fractions. beta-Phellandrene was the main component found in the HD and MWHD essential oils, SDE and SFE extracts (61, 65, 57, and ca. 40%, respectively), followed by beta-myrcene (9.1, 9.3, 8.2 and 5.1%), and alpha-pinene (8.1, 7.3, 8.1 and 5.9%). The main components present in the volatile fractions of the X. aromatica fruits, isolated by S-HS, P&T and HS-SPME were beta-phellandrene (53.8, 35.7 and 39%), beta-myrcene (13.3, 12.3 and 10.1%), p-mentha-1(7),8-diene (7.1, 10.6 and 10.4%), alpha-phellandrene (2.2, 5.0 and 6.4%), and p-cymene (2.2,4.7 and 4.4%), respectively.     

微波场协同提取野菊花黄色素的研究

研究了微波提取野菊花 (Chrysanthemumindicum)黄色素的新工艺并确定了最佳工艺条件 :原料为 2 0 0 0 0g野菊干花 ,提取剂为无水乙醇 ,提取剂比例为 1 /70 ,微波功率为 80 0W ,提取时间为 45 0s,提取次数为 3次 ,最佳工艺条件下色素的提取率为 91 1 % ,产率为 1 4 6% ,色价E ( 1 % ,3 2 1nm)为 42 2 ,产品pH值为 6 5。与溶剂浸提法相比 ,微波提取野菊花黄色素的每次提取时间由 1 2h减小为 45 0s,提取率从 88 6%增加到 91 1 %。     

High-performance liquid chromatography analysis of curcumin in rat plasma: application to pharmacokinetics of polymeric micellar formulation of curcumin

A simple, rapid and reliable high-performance liquid chromatographic (HPLC) method was developed and validated for the determination of curcumin in rat plasma. Plasma was precipitated with acetonitrile after addition of the internal standard (IS), 4-hydroxybenzophenone. Separation was achieved on a Waters muBondapak C(18) column (3.9 x 300 mm, 5 microm) using acetonitrile (55%) and citric buffer, pH 3.0 (45%) as the mobile phase (flow rate = 1.0 mL/min). The UV detection wavelength was 300 and 428 nm for IS and curcumin, respectively. The extraction efficiencies were 97.08, 95.69 and 94.90% for 50, 200 and 1000 ng/mL of curcumin in rat plasma, respectively. The calibration curve was linear over the range 0.02-1 microg/mL with a correlation coefficient of r(2) > 0.999. The intra- and inter-day coefficients of variation were less than 13%, and mean intra- and inter-day errors were less than +/-6% at 50, 200 and 1000 ng/mL of curcumin. This assay was successfully applied to the pharmacokinetic studies of both solubilized curcumin and its polymeric micellar formulation in rats. It was found that polymeric micelles increased the half-life of curcumin 162-fold that of solubilized curcumin and increased the volume of distribution (Vd(ss)) by 70-fold.