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小八角莲活性成分提取分离、质量控制及药效研究
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摘要
中药活性成分研究是当前药学领域的热点课题。采用现代化学手段开展中药活性成分质量控制、提取分离和药效研究是中药现代化研究的重要内容。小八角莲是小檗科八角莲属植物,在湖南省广泛分布,根和根茎入药,具有清热解毒,散结祛瘀功效,用于治疗淋巴结炎、腮腺炎和肺炎等,疗效确切。但关于小八角莲的相关研究十分少见。为了充分发挥湖南资源特色,深入开发利用小八角莲植物资源优势,本论文从化学成分、质量控制、活性成分提取分离和药效评价等方面对小八角莲开展了较系统而全面的研究,获得了一批较有价值的研究成果,为小八角莲植物资源产业化利用打下了坚实基础。
     1、首次开展小八角莲化学成分研究,并明确了主要化学成分。
     应用现代色谱技术对小八角莲的乙醇提取物进行了系统的分离,从中分离得到了木脂素、黄酮类等共6种化合物,通过经典的化学方法和各种现代波谱学技术(UV, IR, EI-MS, FAB-MS,1H-NMR,13C-NMR等)进行了结构鉴定。木脂素类成分主要为鬼臼毒素和4'-去甲基鬼臼毒素。黄酮类成分主要为山奈酚、槲皮素、槲皮苷和芦丁。以上6种化学成分均为首次从小八角莲中分离得到。
     2、系统研究小八角莲质量控制,并制订质量标准草案。
     依据《中国药典》,对小八角莲来源、性状、鉴别、检查和含量测定等质量控制项目进行了系统研究。确定了小八角莲的来源与性状特征;建立了小八角莲粉末显微鉴别和活性成分-鬼臼毒素和槲皮素的薄层色谱鉴别方法;明确了小八角莲检查杂质不得过2%,水分不得过15%,重金属不得过百万分之五,砷盐不得过百万分之二;采用高效液相色谱法建立了小八角莲活性成分鬼臼毒素含量测定方法,以C18为固定相,甲醇-0.1%磷酸水(60:40)为流动相,室温,流速1.0ml/min,检测波长为292nm,线性范围0.20-2.00μg相关系数r=0.9999,平均加样回收率为100.23%,RSD为0.99%。在此基础上,制订了小八角莲质量标准草案。
     3、首次开展小八角莲指纹图谱研究,考察不同产地小八角莲整体性化学表征差异。
     建立了小八角莲HPLC色谱指纹图谱研究方法:以甲醇为提取溶媒,采用超声波提取法制各样品溶液。检测波长254 nm,其他色谱条件与含量测定相同。该方法所得指纹图谱稳定性好、响应峰多、吸收强、特征明显,所测组分均达到基线分离,可作为小八角莲指纹图谱研究方法。以湖南、湖北、贵州等7个产区的131批药材为材料,对不同供试品所得指纹图谱进行分析,共标定了13个特征峰。将样品色谱图与对照品色谱图进行比对,可确定1号峰、3号峰、7号峰、10号峰和12号峰分别为芦丁、槲皮苷、槲皮素、鬼臼毒素和山奈酚。指纹图谱相似度采用自主开发的“色谱指纹图谱相似度评价系统”进行计算,全国不同产地小八角莲样品的平均相似度为0.965±0.018。
     采用主成分分析法(PCA)分析表明:药材指纹图谱相似度大小与其产地有关,地理位置越接近,药材相似度越高。
     4、开展木脂素类活性成分鬼臼毒素提取分离研究,获得了鬼臼毒素制备新工艺。
     采用乙醇回流提取和C02超临界萃取法,开展木脂素类活性成分鬼臼毒素提取工艺研究。结果,醇回流提取小八角莲提取率显著高于C02超临界萃取法。鬼臼毒素最佳提取工艺是,以80%乙醇为提取溶媒,沸水浴连续回流提取2次,第一次加9倍量溶媒,提取60分钟,第二次加7倍量溶媒,提取45分钟。
     采用大孔树脂分离技术分离纯化木脂素类活性成分鬼臼毒素。大孔树脂分离纯化最佳条件为:选择HPD-100、LSA-5B和HPD-400大孔吸附树脂作为上柱树脂,上样浓度为4.81mg/ml(相当于原生药),先以蒸馏水,10%乙醇除去杂质,再有70%乙醇洗脱,收集70%乙醇洗脱部分。鬼臼毒素在总固形物中的百分含量可达80%以上。
     5、研究鬼臼毒素抗胃癌SGC7901细胞株的作用,为鬼臼毒素用于临床治疗胃癌提供依据。
     不同浓度的鬼臼毒素(0,5,10,20和50μg/m1)处理SGC7901细胞后,采用MTT比色法和平板克隆形成实验检测细胞的增殖;采用流式细胞术检测细胞周期分布和细胞凋亡;裸鼠成瘤实验检测鬼臼毒素对SGC7901细胞体内致瘤能力的影响。
     鬼臼毒素呈时间与剂量依赖性抑制SGC7901细胞生长,并明显降低SGC7901细胞平板克隆;鬼臼毒素明显诱导SGC7901细胞凋亡,并使SGC7901细胞阻滞于G2/M期;鬼臼毒素显著降低SGC7901细胞裸鼠移植瘤的体积及重量。
     鬼臼毒素能抑制胃癌SGC7901细胞的生长,诱导SGC7901细胞凋亡,并能抑制GC7901细胞的体内致瘤能力,研究结果为鬼臼毒素临床治疗胃癌提供了科学依据。
Traditional Chinese medicines modernization has been a hot topic in recent years, and the main task is quality control, extraction and isolation and pharmaceutical efficiency. Dysosmae Difformis is one of Berberidaceae Dysosma plants and distributes widely in Hunan Province. Radix and Rhizoma of Dysosmae Difformis are usually used as drug. It has qingrejiedu and sanjiequyu efficacy, and can treat lymph nodes swollen, lumps, pneumonia, etc. To our best knowledge, the research about Dysosmae Difformis is very less. For utilizing the resources of Dysosmae Difformis fully in Hunan province, we focus on the chemical components, quality control, extraction and isolation of active components, pharmacodynamics, etc. The results provide scientific basis for the industrialization of Dysosmae Difformis.
     1. Research about the main chemical constituents of Dysosmae Difformis for the first time.
     Six compounds including two lignans and four flavonoids have been isolated from the ethanol extract of Dysosmae difformis using various modern chromatographic techniques, and the structures have been identified as podophyllotoxin,4'-demethylepipodophyllotoxin, kaempferol, quercetin, quercitrin and rutin, by classical chemical methods and modern spectrometric approaches such as UV, IR, EI-MS, FAB-MS, 1H-NMR and 13C-NMR, etc. All the six compounds were isolated from Dysosmae difformis for the first time.
     2. Systematical research on quality control of Rhizoma Dysosmae difformis, and formulating the control standard.
     The sources, characteristics, identification, test and determination of Rhizoma Dysosmae difformis have been investigated by requests of ChP 2005, volumeⅠ. The source and the characteristics have been determined. The method for microscopic identification of the powder characteristics has been established and the TLC chromatogram identification of podophyllotoxin and quercetin have also been optimized. The impurity is less than 2%. The the moisture content is less than 15%. The heavy metal content is less than 5 ppm, and the arsenic level is less than 2 ppm. HPLC method for determination of Podophyllotoxin has been established. Separation was performed using Kromasil-C18 column (250mm×4.6mm, i.d.) with 5μm particle size. Mobile phase was consisting of methanol: 0.1%H3PO4= 60:40 (v/v). All separations were operated at room temperature and a flow-rate of 1.0 ml/min. The detective wavelength was at 292 nm. There was a good linear relationship over the range of 0.20-2.00μg for podophyllotoxin (r= 0.9999). The average recovery rate was 100.57%, and RSD was 0.99%. On those basis, we worked out the Control Standard Draft of Radix et Rhizoma Dysosmae difformis.
     3. Studies on chromatographic fingerprinting of Dysosmae Difformis for the first time.
     The HPLC fingerprints of Radix et Rhizoma Dysosmae difformis were systematically studied. Samples are prepared by ultrasonic extraction technology with methanol. The detective wavelength was at 254 nm, while the other chromatographic conditions were as the same with those in the determination sections. The method had high precision, good repeatability and all of the components were separated well, so it can be used as the means to assess the fingerprints of Radix et Rhizoma Dysosmae difformis.
     The paper analyzed chromatograms of 131 samples from seven habitants of China, such as Hunan, Hubei, Guizhou etc. Thirteen five peaks were identified as the characteristic fingerprints of Radix et Rhizoma Dysosmae difformis. Compared with reference substances, we can identify that the first, third, seventh, tenth and twelfth peak are rutin, quercitrin, quercetin, podophyllotoxin and Kaempferol, respectively. The fingerprints of different samples were compared with similarity evaluation software development by central south university. Average similarity of samples from different places was 0.965±0.018. It is obvious that the similarity is correlated with the habitats of herb. The closer the habitat is, the higher the similarity is.
     4、The extraction and isolation of podophyllotoxin were studied, and the new technology of extraction and isolation of podophyllotoxin were also established.
     The extraction technology of podophyllotoxin were studied by alcohol reflux and SFE-CO2. The experimental result indicated that the yield of podophyllotoxin extracted by alcohol reflux was more than that by SFE-CO2. The optimum extraction technology is as follows:Firstly,9 time of quantity 80%alcohol extracts for 60 min, and secondly,7 time of quantity 80%alcohol extracts for 45 mins.
     The isolation process of podophyllotoxin was studied by macroporous resin. The optimum isolation process is as follows: HPD-100^ LSA-5B and HPD-400 are the best resin to separate and purify podophyllotoxin, and with 4.81mg/ml podophyllotoxin solution to adsorb. First, the macroporous resin was eluted by distilled water and 10% alcohol to wipe off impurities. Second, the macroporous resin was eluted by 80%alcohol, and the eluting solvent was collected. The Content of podophyllotoxin is more than 80%.
     5. Investigating the effects of podophyllotoxin on human gastric cancer cell line SGC7901 cells in vitro and in vivo, and providing its the basis for clinical therapy of gastric cancer.
     SGC7901 cells were treated by podophyllotoxin at various concentrations for different times. The effects of podophyllotoxin on the growth and apoptosis of SGC7901 cells in vitro has been determined by MTT assay, colony formation assay and flow cytometry, respectively. Furthermore, xenograft experiment was performed to detect the effects of podophyllotoxin on the in vivo tumorigenicity of SGC7901 cells.
     The results were as the followings:podophyllotoxin inhibited the growth of SGC7901 cells in a concentration-and time-dependent manner, and inhibited the colony formation rate of the cells. Podophyllotoxin induced SGC7901 cell apoptosis and arrested SGC7901 cells at G2/M phases of cell cycle. Podophyllotoxin decrease the volume and weight of SGC7901 cells xenografts in nude mice.
     Podophyllotoxin could inhibit the growth of human gastric cancer SGC7901 cells, induce the apoptosis of SGC7901 cells in vitro, and inhibit the in vivo tumorigenicity of SGC7901 cells, which provide theoretical basis for clinical therapy of gastric cancer using podophyllotoxin.
引文
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