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甘草抗肝炎有效部位及其纳米粒的制备
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摘要
肝炎是危害人类健康的严重疾病之一,近年来中医药在治疗肝炎方面取得了长足的发展,从传统的中药中寻找有效部位治疗病毒性肝炎已成为研究的热点。豆科甘草属植物甘草是常用中药材,它的主要成分为甘草酸等三萜皂苷和甘草苷为主的甘草黄酮,近年的研究发现其具有解痉镇痛,抗病毒,抗炎症,抗癌等多种药理作用,而甘草治疗肝炎的应用在国内外均有报道。一般的抗肝炎药物靶向性差,而利用纳米粒作为药物载体可有效地促进药物进入肝细胞,从而增强药物的肝靶向性和疗效,因此可用于治疗病毒性肝炎。
     本课题为甘草抗肝炎有效部位及其纳米粒的制备。首先为全面控制甘草药材的质量,为制剂提供稳定的药材来源,用高效液相色谱法建立了不同产地甘草药材的指纹图谱,然后提取纯化了甘草抗肝炎有效部位—甘草总皂苷,考察了甘草总皂苷的提取纯化工艺,接着以羧甲基壳聚糖为载体制备了甘草总皂苷纳米粒并对其进行了质量评价。主要研究内容和结论如下:
     1.采用高效液相色谱法(HPLC)建立了不同产地甘草药材的指纹图谱。采用Hypersil ODS2C18 (4.6mm×250mm; 5μm)色谱柱,甲醇-0.1%磷酸水溶液为流动相梯度洗脱,流速为0.6 mL/min,检测波长254nm,采集时间为90min。结果得到了分离度较好的甘草药材HPLC指纹图谱,标定出了11个共有指纹峰,方法学考察结果符合指纹图谱技术要求。确定的指纹图谱研究方法稳定、可靠,可用于甘草药材的质量控制。
     2.研究了提取纯化甘草总皂苷的工艺条件及参数。以正交试验考察了甘草总皂苷的提取工艺;以甘草总皂苷质量浓度为指标,考察了大孔树脂纯化工艺。结果确定甘草总皂苷的最佳提取工艺为:加水量8倍,煎煮时间2h,煎煮次数3次;采用HPD300型树脂的纯化工艺为上样液质量浓度为0.2g生药/mL,上样量为5倍柱体积,50%乙醇洗脱,用量为6倍柱体积。实验结果表明在所确定的工艺条件下,可较好地提取纯化甘草总皂苷。
     3.制备了甘草总皂苷纳米粒并对其进行了质量评价。以正交试验设计法优化了甘草总皂苷纳米粒的制备条件,以透射电镜观察纳米粒形态,紫外分光光度仪测定纳米粒包封率和载药量,激光散射仪测定粒度分布,同时进行纳米粒的体外释放性能研究。结果显示纳米粒外观形态圆整,平均粒径为114nm,包封率为43.4%,载药量为16.4%。所确定的实验方法为甘草总皂苷纳米粒制剂的研究和.应用提供了参考。
Hepatitis is one of the serious disease which threaten to human health, and in recent years Traditional Chinese Medicine has made great progress on the treatment of Hepatitis. The present invention relates to a process for the treatment of viral hepatitis by searching for effective fraction from Traditional Chinese Medicine. Leguminosae Glycyrrhiza licorice is commonly used in traditional Chinese medicine, which is composed of Triterpenoid saponins such as Glycyrrhizin and FGU major in LQ. Recently all sources mention its use for antispasmodic analgesic, anti-virus, anti-inflammatory, anti-cancer and other pharmacological effects, in addition, the treatment of hepatitis using licorice have been reported at home and abroad. The general anti-hepatitis drug is lack of targeting, while making use of nanoparticles as drug carrier can effectively accelerate the drug into the liver cells, in further enhancing liver targeting of drugs and efficacy. Thus it can be used to the treatment to viral hepatitis.
     This topic relates to a process for searching for an anti-hepatitis effective fraction from Licorice and the preparation of nanoparticles. First of all, we must make full control of the quality of licorice, provide a stable source of medicine for the preparation. Meanwhile we adopt high performance liquid chromatography to establish the fingerprint of Glycyrrhiza uralensis from different Fisch origin, and then extract from licorice and purify the effective parts of anti-hepatitis-total saponins from liquorice.. Furthermore, we study the process of the extraction and purification technology of total saponins from liquorice., use Carboxymethyl chitosan as drug carrier to prepare for nanoparticles,and make evaluation of its quality. The main contents and conclusions are as follows:
     1. To establish the HPLC fingerprint of Glycyrrhiza from different habitats. Separation was performed on a Hypersil ODS2 C18 column(4.6mm×250mm; 5μm) with methanol-0.1% phosphate water as mobile phase using gradient elution at flow rate of 0.6mL/min. The detection wavelength was at 254 nm and the analysis time was 70 min. The HPLC fingerprints of Glycyrrhiza with good separation were set up. And there were 11 common peaks. The results of method validation was consistent with the technical standard of fingerprints. The method of fingerprints was stable and reliable,so as to apply to the quality control of Glycyrrhiza.
     2. To investigate the technological parameters of the extraction and purification process of total saponins from liquorice. Studied the extraction of total saponins from liquorice with orthogonal test; The technical process for purification of total saponins with the macroporous resins was screened by yield of total saponins as index. The optimum technological conditions for extraction:the water consumption 8 times, the total time 2h, the decoction times 3 times; The optimum parameters with resin HPD300 were established as followings:5 BV sample extract whose concentration was 0.2g (crude drug)/mL was passed through the column,and then the column was eluted with 6 BV 50% ethanol. With definite technical process, the total saponins from liquorice could be well extracted and purified.
     3. To prepare the nanoparticles of total saponins from liquorice and to evaluate its quality. The formulation of NP were optimized by the orthogonal test. The morphology was examined by the transmission electron microscope. The ultraviolet spectrophotometer was employed to determine the entrapment rate and drug-loading rate of NP. The diameter of NP were investigated by laser light scattering analysis instrument. And the release performance of NP in vitro was studied. The nanoparticles were round, smooth particles with average size of 114nm, entrapment rate 43.4% and drug-loading rate 16.4%. The result can provide a reference for studying the nanoparticles of total saponins from liquorice.
引文
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