红枣中熊果酸的微波提取工艺研究

以红枣为原料,利用微波技术提取红枣中熊果酸。通过单因素实验和正交实验,考察φ(乙醇)、液料比、提取温度、微波功率、微波提取时间对熊果酸提取率的影响。结果表明,微波法提取红枣熊果酸的最佳工艺条件为:φ(乙醇)=90%、液料比20∶1(mL/g)、提取温度60℃、微波功率300 W、微波提取时间90 s。在此工艺条件下,熊果酸的提取率为2.412 7 mg/g。     

微波萃取、高效液相色谱法测定番石榴叶中的齐墩果酸和熊果酸

建立了微波萃取、高效液相色谱测定番石榴叶中齐墩果酸和熊果酸的方法。采用分式析因设计实验考察了微波萃取参数的影响,番石榴叶粒度和萃取时间是影响齐墩果酸和熊果酸的微波萃取产率的最重要因素。优化的微波萃取条件如下:60~80 mesh番石榴叶、10 mL乙醇、80℃和10 min。微波萃取与索氏萃取得到的齐墩果酸和熊果酸产率一致,然而,前者仅需10 min,后者则需要4 h。     

微波辅助提取山楂中熊果酸的工艺研究

对微波辅助提取山楂中熊果酸的工艺条件进行了研究,通过正交试验对工艺条件进行了优化,结果表明：各因素对熊果酸提取率的影响顺序为：乙醇质量分数〉提取温度〉微波时间〉微波功率〉液料比,乙醇质量分数为显著影响因素;最佳条件为：乙醇质量分数为85%、提取温度为55℃、微波时间为4min、液料比为16∶1、微波功率300W,在此条件下的熊果酸提取率为3.42%。     

聚甲醛和热塑性聚氨酯共混改性的研究

应用薄层扫描法，以熊果酸对照品为标准考察了浙江省山茱萸饮中熊果酸的含量。结果表明，样品含量均低于中国药曲标准。     

熊果酸的抗肿瘤活性及作用机理研究进展

熊果酸属五环三萜类化合物,来源丰富,具有广泛的生物活性。概述了熊果酸在医药领域的研究进展,着重论述了熊果酸的抗肿瘤活性及其抗肿瘤作用机理,并对熊果酸的研究开发前景进行了探讨。     

熊果酸提取方法及其功能应用的研究

综述了常见的几种提取熊果酸的优化方法,并介绍了熊果酸的主要功能作用。重点概述了熊果酸有保持湿润、美白肌肤、抗氧化性等护肤功效,并介绍了熊果酸的相关应用研究,尤其是在护肤品、化妆品领域的应用研究发展。     

熊果酸对血管内皮细胞增殖的影响及其机制

目的研究熊果酸(Ursolic acid,UA)对人脐静脉血管内皮细胞(Human umbilical vein endothelial cells,HUVECs)增殖及ERK1、c-Jun、c-Myc、Cyclin D1基因mRNA和蛋白表达的影响,探讨熊果酸抑制血管生长的机制。方法体外培养HU-VECs,用不同浓度熊果酸(31.5、62.5、125、250、500μg/ml)处理不同时间(12、24、48 h),MTT法检测细胞增殖抑制率。用125μg/ml熊果酸和100μmol/L PD98059(ERK抑制剂)处理HUVECs 48 h;不同浓度熊果酸处理24 h;125μg/ml熊果酸处理不同时间,RT-PCR和Western blot分别检测HUVECs中ERK1、c-Jun、c-Myc、Cyclin D1基因mRNA的转录水平和蛋白的表达水平。结果不同浓度的熊果酸对HUVECs的增殖均有明显的抑制作用,且呈剂量和时间依赖性;经熊果酸和PD98059处理的HUVECs中ERK1、c-Jun、c-Myc、Cyclin D1基因mRNA和蛋白的表达水平均明显降低,且呈剂量和时间依赖性。结论熊果酸可通过抑制ERK信号转导通路而抑制血管内皮细胞增殖。     

熊果酸衍生物的合成

设计合成了熊果酸衍生物.对熊果酸的3-位、28-位进行结构修饰,通过一系列的酰化反应制备其衍生物,并通过红外、核磁对其结构进行鉴定.制备了8个熊果酸衍生物,其中4个化合物为新化合物.这些化合物结构正确,其中合成的熊果酸钠盐比熊果酸具有更好的水溶性,从而改善了制剂质量.     

超声波辅助提取石榴皮中熊果酸工艺研究

以石榴皮为原料,以熊果酸得率为指标,采用超声波辅助提取了石榴皮中熊果酸。分别研究了提取剂乙醇浓度、料液比、超声时间、超声温度对熊果酸提取的影响,通过正交试验优化了提取工艺。结果表明,熊果酸提取的最佳工艺条件是:乙醇体积分数50%、固液比1∶20、超声时间30 min、超声温度60℃,在最佳条件下,熊果酸得率可达1.1142%。     

正交设计法优化从车前草中萃取熊果酸的工艺研究

用正交实验法优化采用超临界CO2技术萃取车前草中熊果酸的工艺条件。在单因素实验基础上,采取L9（3^3）探讨萃取压力、萃取温度、CO2流量对萃取车前草熊果酸的得率的影响情况,确定了超临界CO2萃取车前草中熊果酸的适宜条件。超临界萃取最优条件为：萃取压力35MPa,萃取温度为40℃,选择无水乙醇为夹带剂,夹带剂质量分数为20％,萃取时间2h,CO2流量为20L/h,产品的出膏率为3．58％,萃取物中熊果酸的含量为6．93％。该法与传统方法相比,具有操作简便快速,溶剂用量少,有效成分提取率高等优点。     

Microwave-Assisted Extraction of Oleanolic Acid and Ursolic Acid from Ligustrum lucidum Ait

Oleanolic acid and ursolic acid are the main active components in fruit of Ligustrum lucidum Ait, and possess anticancer, antimutagenic, anti-inflammatory, antioxidative and antiprotozoal activities. In this study, microwave-assisted extraction of oleanolic acid and ursolic acid from Ligustrum lucidum was investigated with HPLC-photodiode array detection. Effects of several experimental parameters, such as type and concentration of extraction solvent, ratio of liquid to material, microwave power, extraction temperature and microwave time, on the extraction efficiencies of oleanolic acid and ursolic acid from Ligustrum lucidum were evaluated. The influence of experimental parameters on the extraction efficiency of ursolic acid was more significant than that of oleanolic acid (p < 0.05). The optimal extraction conditions were 80% ethanol aqueous solution, the ratio of material to liquid was 1:15, and extraction for 30 min at 70 °C under microwave irradiation of 500 W. Under optimal conditions, the yields of oleanolic acid and ursolic acid were 4.4 ± 0.20 mg/g and 5.8 ± 0.15 mg/g, respectively. The results obtained are helpful for the full utilization of Ligustrum lucidum, which also indicated that microwave-assisted extraction is a very useful method for extraction of oleanolic acid and ursolic acid from plant materials.     

苦丁茶中熊果酸的提取及含量测定研究

对苦丁茶的提取方法进行考查,并对各种苦丁茶中的熊果酸进行定性鉴别和含量测定。方法考查结果表明：以乙醚为溶剂,索氏提取3．5h为宜,此法重现性和回收率良好。定性鉴别和含量测定结果表明：冬青科苦丁茶熊果酸含量较高,而木樨科苦丁茶不含熊果酸,且熊果酸的含量随贮存时间的延长而降低。     

熊果酸香皂的制备及其生物活性研究

以棕榈油皂粒为皂基制备熊果酸香皂,按照国家标准方法对香皂中游离苛性碱、水分和挥发物含量进行检测,采用平板计数法和动物实验对该香皂的体外抑菌作用和安全性进行研究。结果表明,熊果酸香皂对白色假丝酵母、肺炎克雷伯氏菌、伤寒沙门氏菌、铜绿假单胞菌、MRSA1和MRSA2均具有明显抑菌作用,在熊果酸质量分数为7.5%时抑菌效果最为显著,动物实验表明香皂对小鼠皮肤和眼睛黏膜无不良反应和毒副作用,长期使用不会对皮肤产生刺激性。     

不同产区连钱草中熊果酸含量测定的研究

综述了不同产区连钱草中熊果酸含量测定的研究进展,多采用高效液相色谱法测定,熊果酸都呈良好的线性关系,加样回收率较好,对保证药材质量、指导栽培生产,以及相关制剂产品的质最控制具有重要意义和应用价值。     

Ultrasonic assisted extraction of ursolic acid from apple pomace: A novel and facile technique

Substantial amount of apple pomace (AP) is produced in apple processing industries and is often discarded as waste which becomes a source of polluting the environment. However, the by-product constitutes a promising bioresource of ursolic acid with various biological activities. Therefore, this particular research study was aimed to develop a novel and facile method to separate ursolic acid from AP. First, AP was extracted with ultrasound assistance using methanol as extraction solvent, 2.86% with 10:1 (mL g^?1) of liquid–solid ratio, 300 W of ultrasonic power, 50°C of extraction temperature, and 90 min of ultrasonic time. Meanwhile, the disruption effect of ultrasound on AP was observed by scanning electron microscope. Second, a novel and facile method was applied to separation of ursolic acid, then a perfect colorless needle crystal of ursolic acid was obtained with the yield of about 1.34% of dry AP.     

离子液体中结晶分离熊果酸和齐墩果酸研究

为拓展结晶溶剂的范围和提高结晶分离熊果酸和齐墩果酸的性能,引入离子液体作为结晶溶剂。测定了熊果酸和齐墩果酸在六种离子液体+乙醇溶液中的溶解度数据,根据该数据,选取1-辛基-3-甲基咪唑六氟磷酸+乙醇混合溶液作为溶剂对熊果酸和齐墩果酸进行了结晶分离,并采用单因素实验对结晶工艺进行了初步优化。结果表明：在1-辛基-3-甲基咪唑六氟磷酸质量分数5%,熊果酸和齐墩果酸质量比1.5∶1,结晶温度30℃,结晶时间14 h的条件下,结晶产物中齐墩果酸的质量分数可以达到85%左右。     

乌索酸的生产工艺

Production of ursolic acid, the anti-hepatitis effective composition from natural plant, Sambucus chinensis Lindl. was carried out and the scale-up preparation technology was studied. Extraction of the herb Sambucus chinensis Lindl. was extracted in reflux with 7 volume times of refluxing ethanol at 80℃ for 1 h for two times. The extract was purified with a seh-made specific impurity remover ＂YCXY-1＂ to yield ursolic acid of high purity. A new ＂Extraction/Gelation＂ technology for the production of ursolic acid was developed. The specific impurity remover ＂YCXY-1＂ showed high effectiveness in purification. The purity of the mass-produced ursolie acid was up to 99.8%. The chemical structure of the product was confirmed by the physicochemical constants and spectroscopic identification. The production of high-purity ursolic acid was optimized with natural plant as raw material and with only ethanol as extracting solvent. The difficulties such as isolation and impurity removal were addressed effectively. The novel technology is reasonable, convenient, practical, low-cost, high-yield, suitable for mass production.     

分光光度法测定苦丁茶中的熊果酸含量

用5%香草醛-冰醋酸及高氯酸显色,在波长548nm处用分光光度法测定了海南苦丁茶中的熊果酸含量。回归方程为Y=0.04473X 0.08073,相关系数r=0.9983。熊果酸平均回收率为101.2%,RSD为2.01%(n=5)。本法操作简便、可行、重现性好。     

高效液相测定沙棘果皮中熊果酸和齐墩果酸的含量

建立沙棘果皮中齐墩果酸、熊果酸的含量测定方法。采用高效液相色谱法,Nova-Pack型C18柱,乙腈-甲醇-水-醋酸铵（65∶20∶15∶0.5）为流动相,检测波长为210nm;流速0.6mL/min。熊果酸回归方程为y=74.0x＋9.12,r=0.9995,线性范围0.11～10.64μg/mL,齐墩果酸回归方程为y=61.6x＋7.40,r=0.9992,线性范围0.12～12.36μg/mL。沙棘果皮中熊果酸和齐墩果酸的平均含量为1.187mg/g和0.352mg/g,平均回收率为100.3%、100.5%（n=3）,RSD分别为1.47%、1.50%（n=3）。该方法可同时测定沙棘果皮中齐墩果酸和熊果酸的含量,可用于药材质量控制。