差示分光光度法测定杜仲叶提取液中绿原酸的含量

目的对杜仲叶提取液中的绿原酸进行含量测定。方法采用差示分光光度法。结果该试验所建立的分析方法有较好的重现性和稳定性,测定方法的平均回收率为100.41%,RSD=1.5%。结论该方法简便、快速、准确、重现性好。     

杜仲提取物对小鼠皮肤光老化保护作用的实验研究

目的:研究杜仲提取物对光老化模型小鼠皮肤的保护作用。方法:用紫外光疗仪(UVA+UVB,模拟日光)照射KM小鼠,建立光老化小鼠模型,灌胃或外用给予杜仲提取物,观察小鼠皮肤的组织形态,测定小鼠血浆中超氧化物歧化酶(SOD)及丙二醛(MDA)的含量。结果:外用及灌胃低剂量杜仲提取物均能有效提高小鼠血浆中SOD活力(P<0.05)、降低MDA含量(P<0.05),且外用能显著减轻小鼠皮肤组织受损程度。结论:杜仲提取物具有抗皮肤光老化的作用,且外用优于口服,作用机制可能与其能够清除自由基和活性氧,从而防止组织过氧化损伤有关。     

大孔吸附树脂提取纯化杜仲叶绿原酸的研究

目的 提取纯化杜仲叶绿原酸，确定最佳吸附树脂吸附-解吸条件。方法 以乙醇提取液为吸附原液，静态吸附实验筛选树脂；动态吸附实验确定最佳树脂的吸附-解吸条件。结果 NKA-Ⅱ树脂最佳吸附-解吸条件：吸附流速2ml／min，原液过柱吸附2次，最佳吸附剂为40％乙醇。结论 NKA-Ⅱ树脂是吸附绿原酸的理想吸附剂，适宜于产业化生产。     

Research progress on the protective effects of aucubin in neurological diseases

ContextAucubin (AU), an iridoid glycoside that is one of the active constituents of Eucommia ulmoides Oliv. (EUO) (Eucommiaceae), a traditional Chinese medicine, has been extensively studied in the management of neurological diseases (NDs). However, a comprehensive review of its effects and mechanisms in this regard is currently not available.ObjectiveTo compile the protective effects and mechanisms of AU in NDs and provide a basis for further research.MethodsWe used ‘aucubin’ as the ‘All Fields’ or ‘MeSH’ in PubMed, Web of Science and China National Knowledge Infrastructure without any limitation to search all relevant articles as comprehensively as possible; we selected the articles on AU treatment of NDs for summary.ResultsStudies reviewed herein reported that AU improved the symptoms or prognosis of Parkinson’s disease, Alzheimer''s disease, intracerebral haemorrhage, diabetic encephalopathy, epilepsy, anxiety and depression, and traumatic brain injury. The pharmacological mechanisms involved in repairing neuronal loss were postulated to include increasing γ-aminobutyric acid (GABA) content in the synapse, promoting differentiation of neural precursor cells into GABAergic neurons, providing antioxidant and anti-neuroinflammation activities, as well as enhancing autophagy and anti-apoptotic actions.Discussion and conclusionsThe protective effects of AU on some NDs have been confirmed. According to the pharmacological effects, AU is also highly likely to have protective effects on other NDs, which can be realized by further in vivo and in vitro basic research, and clinical trials. In the future, AU may be used for clinical prevention or treatment of patients with neurological diseases.     

基于网络药理学及分子对接探讨杜仲叶防治骨质疏松的作用机制

目的：采用网络药理学-分子对接预测杜仲叶防治骨质疏松症的作用机制。方法：利用中药系统药理学数据库与分析平台(TCMSP)及SwissTargetPrediction分析平台对杜仲叶活性成分及作用靶点进行筛选,使用GeneCards、在线人类孟德尔遗传(OMIM)数据库、治疗靶点数据库(TTD)对骨质疏松症的对应靶标进行筛选,将中药靶基因与疾病靶基因相交集,将交集靶点导入Cytoscape软件构建成分靶点网络,使用STRING分析平台及Cytoscape软件构建蛋白质-蛋白质相互作用(PPI)网络,筛选核心靶点。对中药-疾病共同靶标进行基因本体(GO)功能富集分析和京都基因和基因组百科全书(KEGG)功能富集分析,得出中药-疾病共同靶标相关的信号通路,最后运用AutoDock与Pymol软件对预测靶标与其对应的成分进行分子对接。结果：筛选后得到杜仲叶治疗防治骨质疏松症的有效成分7个,杜仲叶-骨质疏松症共同靶标231个,并推断其作用机制可能与动脉粥样硬化信号通路的下游核因子κB信号通路,MAPK信号通路、TNF、PI3K-AKT、IL-17及HIF-1信号通路等有关,且MAPK1、STAT...     

杜仲漂浮型脉冲释药片的研制

目的制备杜仲提取物漂浮型脉冲释药片,并优化其处方。方法以崩解时间和溶出度为指标,筛选杜仲提取物速释片芯的崩解剂,通过单因素试验探讨片芯、包衣处方因素及水平,以及压片压力因素对制剂体外释药及漂浮性能的影响。结果优化的处方,交联聚维酮(PVPP)为片芯崩解剂,包衣处方中40%羟丙甲基纤维素(HPMC K15M)为凝胶材料,致孔剂乳糖用量为20%,起泡剂碳酸氢钠用量为20%,润滑剂微粉硅胶用量为2%,其余为微晶纤维素。压片压力为(40±5)N。体外释放试验表明,样品经过6~7 h时滞期后脉冲释放药物。结论杜仲漂浮型脉冲片可达到瞬间起漂,并持续到预定的时滞期脉冲释药,能满足节律性疾病的治疗要求。