正交试验优选桑寄生中槲皮苷的提取工艺

目的:优选桑寄生中槲皮苷的提取工艺。方法:以槲皮苷提取率为指标,HPLC测定槲皮苷含量,选取甲醇体积分数、甲醇量、超声时间、浸泡时间为考察因素,通过单因素试验和正交试验优选桑寄生中槲皮苷的提取工艺。结果:各因素对槲皮苷提取率的影响顺序为甲醇体积分数>甲醇用量>超声时间>浸泡时间。优选的提取工艺条件为取桑寄生药材粉末加50倍量75%甲醇浸泡1 h后超声处理45 min,槲皮苷提取率8.64 mg.g-1。结论:该提取方法操作简单、方便,为桑寄生槲皮苷的进一步研究提供试验依据。     

正交试验法优化白金胶囊中合欢花提取工艺

目的优化筛选白金胶囊中合欢花的提取工艺。方法以合欢花中槲皮苷及总黄酮的提取率作为评价指标,采用正交设计法考察溶剂用量、提取时间、提取次数对提取结果的影响,确定最佳提取工艺。结果合欢花的最佳提取工艺为:采用12倍量70%乙醇,回流提取2次,每次2 h。结论该提取工艺简便易行、稳定可靠,可为白金胶囊的实际生产提供依据。     

正交试验法研究赶黄草提取工艺

目的：优选赶黄草提取工艺。方法：采用正交试验设计的方法,以赶黄草所含的槲皮苷为指标,考察乙醇用量、提取时间、提取次数和乙醇浓度4种因素对提取结果的影响。槲皮苷的含量用HPLC法测定。结果：提取次数对赶黄草醇提物中的槲皮苷含量有显著影响。结论：赶黄草中槲皮苷的最佳提取工艺为10倍量药材的80%乙醇,提取2次,每次1h。     

正交实验法优选骨碎补提取工艺的研究

目的：研究骨碎补的提取工艺。方法：以骨碎补总黄酮及柚皮苷含量为指标，采用正交实验法进行优选，并用紫外分光光度法测定总黄酮的含量．HPLC法测定柚皮苷含量。结果：提取次数是骨碎补有效成分提取的关键因素，其次是溶媒用量．乙醇浓度和提取时间为最次要因素。结论：最佳提取工艺为骨碎补用10倍量60％乙醇回流提取3次．1h/次。     

化橘红中黄酮成分提取工艺的研究

目的：研究化橘红中黄酮成分的提取工艺。方法：以化橘红中柚皮苷含量为指标，采用正交试验法进行优选，并用HPLC测定柚皮苷含量。结果：乙醇浓度和提取次数是化橘红中黄酮成分有效成分提取的关键因素，其次是提取时间，溶媒用量为最次要因素。结论：最佳提取工艺为化橘红用8倍量80％乙醇回流提取3次，1．5h／次。     

白芍提取工艺的研究

目的研究白芍中白芍总苷的提取工艺。方法以芍药苷含量为指标,采用正交实验法进行工艺优选。结果提取时间是白芍中有效成分提取的关键因素,其次是乙醇浓度和加醇量,提取次数是最次要因素。结论白芍最佳提取工艺为用8倍量70%乙醇,加热提取两次,3 h/次。     

山核桃树皮中槲皮苷的提取工艺优选及含量测定

目的:优选山核桃树皮中槲皮苷的提取工艺,并建立其含量测定方法。方法:采用乙醇回流法提取山核桃树皮,经聚酰胺吸附去杂、多次析晶得槲皮苷,采用核磁共振波谱法(NMR)确证其结构,HPLC测定其含量。通过正交试验考察乙醇体积分数、提取时间和提取次数对槲皮苷得率的影响。结果:经NMR确证产物为槲皮苷,HPLC表明其在4.8～91.2 mg·L-1呈良好线性关系,山核桃树皮中槲皮苷含量高达8.37%。最佳提取工艺为10倍量60%乙醇回流提取2次,每次1 h,提取率>90%。结论:建立的山核桃中槲皮苷含量测定方法简单精确,优选的提取工艺稳定可行。     

正交试验法优选赶黄草的提取工艺

目的:优选赶黄草的提取工艺.方法:以槲皮苷提取量为指标,采用正交试验考察乙醇用量、提取时间、提取次数和乙醇体积分数对提取工艺的影响.HPLC测定槲皮苷含量.结果:提取次数对赶黄草提取工艺的影响最大,最佳提取工艺为加10倍量80％乙醇提取2次,每次0.5h.结论:优选的提取工艺稳定可行.     

火炭母中黄酮提取工艺的优选

目的:优选火炭母中黄酮的提取工艺。方法:以槲皮素、槲皮苷和总黄酮的得率为指标,采用正交试验法考察乙醇百分数、料液比、提取时间和提取次数4个影响因素,优选火炭母中黄酮的超声提取工艺。结果:超声提取液中黄酮含量高于回流提取液,其最佳的提取条件为乙醇体积分数85%,料液比1∶15,提取时间为30 min,提取次数3次。结论:该工艺简单可行,成本低廉,安全可靠,为火炭母中黄酮成分工业化生产提供了理论依据。     

反相高效液相色谱法测定合欢不同部位中槲皮苷的含量

目的建立合欢不同部位中槲皮苷的含量测定方法。方法样品用甲醇超声提取40 m in,提取物用流动相溶解。D iamonsil C18柱(4.6 mm×250 mm),甲醇-水-冰醋酸(45∶55∶1.5)为流动相,检测波长为256 nm。结果槲皮苷在2.545~20.36μg/m l浓度范围内线性关系良好(r=0.999 9),平均加样回收率为98.09%,RSD为0.5%。结论此方法简便可靠,可为合欢花药材的质量控制提供借鉴。     

Sedative activity of two flavonol glycosides isolated from the flowers of Albizzia julibrissin Durazz

The flowers of Albizzia julibrissin are used as a sedative in oriental traditional medicine. The phytochemical study of this plant allowed the isolation of two flavonol glycosides, quercitrin (1) and isoquercitrin (2). The sedative activity of these compounds was evaluated, and both compounds 1 and 2 increased pentobarbital-induced sleeping time in dose-dependent manner in mice. These results support the use of the flowers of this plant as a sedative agent.     

中药合欢花抗抑郁活性部位的初步筛选研究

目的合欢花抗抑郁作用有效部位的筛选。方法采用小鼠强迫游泳药理实验对合欢花水提物和醇提物及其各萃取部位进行抗抑郁活性筛选。结果合欢花醇提物与水提物的石油醚和醋酸乙酯萃取部位与对照品安拿芬尼类似,均能显著缩短小鼠游泳的不动时间。结论合欢花醇提物与水提物及其石油醚和醋酸乙酯萃取部位对“行为绝望”动物模型有较明显的抗抑郁作用,提示非极性成分及中等极性成分可能为合欢花抗抑郁作用的活性物质。     

Molecular basis and mechanism of action of Albizia julibrissin in depression treatment and clinical application of its formulae

Albizzia julibrissin is empirically used as an antidepressant in clinical practice. Preclinical studies have indicated that its total extracts or bioactive constituents exerted antidepressant-like responses in animal models, providing the molecular basis to reveal its underlying mechanism of action. While attempts have been made to understand the antidepressant effect of A. julibrissin, many fundamental questions regarding its mechanism of action remain to be addressed at the molecular and systems levels. In this review, we conclusively discussed the mechanism of action of A. julibrissin and A. julibrissin formulae by reviewing recent preclinical and clinical studies conducted by using depressive animal models and depressive patients. Several representative bioactive constituents and formulae were highlighted as examples, and their mechanisms of action were discussed. In addition, some representative A. julibrissin formulae that have been shown to be compatible with conventional antidepressants in clinical practice were also reviewed. Furthermore, we discussed the future research directions to reveal the underlying mechanism of A. julibrissin at the molecular and systems levels in depression treatment. The integrated study using both the molecular and systematic approaches is required not only for improving our understanding of its molecular basis and mechanisms of action, but also for providing a way to discover novel agents or approaches for the effective and systematic treatment of depression.     

Induction of apoptosis in human acute leukemia Jurkat T cells by Albizzia julibrissin extract is mediated via mitochondria-dependent caspase-3 activation

To understand antitumor activity of Albizzia julibrissin Durazz (Leguminosae), which has been used as a traditional oriental medicine, the mechanism underlying cytotoxic effect of its extract on human acute leukemia Jurkat T cells were investigated. The methanol extract of the stripped barks (3kg) of Albizzia julibrissin was evaporated, dissolved in water, and then sequentially extracted by chloroform, ethyl acetate, and n-butanol. The substance in the butanol extract containing the most cytotoxic activity was further purified by a series of preparative column chromatography. The active substance obtained (723mg) was designated as HaBC18. When Jurkat T cells were treated with HaBC18 (0.5-2microg/ml), apoptosis along with several biochemical events such as mitochondrial cytochrome c release, activation of caspase-9 and -3, degradation of PARP, and DNA fragmentation was induced in a dose-dependent manner. However, the HaBC18-induced apoptosis was abrogated by an ectopic overexpression of Bcl-xL, which is known to block mitochondrial cytochrome c release. Primary cultures of human PBMC were less sensitive to the cytotoxicity relative to Jurkat T cells. These results demonstrate that the cytotoxicity of HaBC18 toward Jurkat T cells is attributable to apoptosis mediated by mitochondria-dependent death-signaling pathway regulated by Bcl-xL.     

合欢花化学成分的研究

目的 :对合欢花化学成分进行研究。方法 :用色谱法和光谱法分离鉴定化学成分。结果 :从合欢花石油醚和乙酸乙酯部分得到 2个化合物 ,鉴定为二十四烷酸和槲皮甙。结论 :均为首次从该植物中分得。     

山核桃树皮中槲皮苷的提取工艺及含量测定研究

[摘要] 目的：对山核桃树皮中槲皮苷的提取工艺进行研究,建立其含量测定方法。方法：采用乙醇回流法提取山核桃树皮,经聚酰胺吸附去杂、多次析晶得槲皮苷,采用核磁共振波谱法（NMR）确证其结构,HPLC法测定其含量,并通过正交实验考查乙醇浓度、提取时间和提取次数对槲皮苷得率的影响。结果：经NMR确证产物为槲皮苷,HPLC法表明其在4.8~91.2µg•mL-1的范围内线性关系良好,山核桃树皮中其含量高达8.37%。最佳的提取工艺为10倍树皮重量的60%乙醇回流提取2次,每次1h,可以获得超过90%的提取率。结论：建立了山核桃中槲皮苷最佳的提取工艺和含量测定的方法,所建立的体系精确可靠。     

Box-Behnken设计-效应面法优化白花蛇舌草总黄酮的提取工艺

目的: 优选白花蛇舌草黄酮类成分的提取工艺,为该药材的资源开发提供参考。方法: 以乙醇体积分数、乙醇用量及提取时间为自变量,芦丁、异槲皮苷、槲皮苷提取量的总评"归一值"为因变量,通过Design-Expert 8.0软件对自变量各水平进行多元线性回归和二项式拟合,利用效应面法优选提取工艺并进行预测分析。采用 HPLC-DAD测定芦丁、异槲皮苷、槲皮苷含量,色谱条件为流动相乙腈(A)-0.05%磷酸溶液(B)梯度洗脱,检测波长254 nm。结果: 最佳提取工艺为加14倍量73%乙醇回流提取2次,每次1.5 h;芦丁、异槲皮苷、槲皮苷平均提取量分别为2.529,0.435,0.215 mg·g^-1,总评"归一值"实测值0.922 7与预测值偏差-1.24%。结论: 优化的提取工艺稳定可行,预测准确度高,为白花蛇舌草总黄酮的制剂开发提供参考。