超声提取对丹参药材中脂溶性成分的影响

通过超声提取丹参药材粉和小节状中的丹参酮ⅡA及隐丹参酮成分小样品实验研究,确立了超声提取丹参药材中脂溶性成分的最佳提取条件,探讨了超声对提取小批量丹参药材中脂溶性成分的影响,并进行了液相色图谱对比.结果表明,超声提取可用于医药工业大生产的提取工艺,所提得的丹参酮ⅡA和隐丹参酮成分与浸泡提取法所得结果比较,结构未变,提取时间短,提取率高.提取最佳条件为用体积分数为90%、料液比为1∶5的乙醇,超声提取45 min.应用此方法提取,丹参药材中的丹参酮ⅡA和隐丹参酮含量分别可达0.285 6%和0.355 5%.     

性状异常丹参的利用价值研究

本文研究性状异常丹参是否具有利用价值。采用HPLC法,Diamonsil C18色谱柱(4.6 mm×250 mm,5μm),乙腈-0.026%磷酸溶液梯度洗脱,检测波长为270、286 nm,流速为1.0 mL·min-1,测定各样品中活性成分含量。结果表明,患病、变色等性状异常的丹参仍含有迷迭香酸、丹酚酸B、丹参酮ⅡA、丹参酮Ⅰ及隐丹参酮等活性成分,部分活性成分含量甚至比正常丹参高数倍,可以作为工业化提取迷迭香酸、丹参酮ⅡA、丹酚酸B等的原材料。     

丹参中隐丹参酮的微波辅助提取工艺

优选丹参中隐丹参酮的微波辅助提取工艺并测定隐丹参酮的含量。采用正交实验对微波辅助提取法进行提取工艺的优选;采用紫外分光光度法测定隐丹参酮的含量。结果表明,隐丹参酮的最佳提取工艺条件为:乙醇浓度95%,提取时间5min,料液比1∶12,隐丹参酮的提取含量为1.521mg/g。该方法快速、高效、稳定、重现性好。     

丹参酮类化合物对海鞘油脂氧化稳定性影响

分别用乙酸乙酯和超临界CO2提取柄海鞘和玻璃海鞘中的油脂,得到了多不饱和脂肪酸含量很高的海鞘油脂,即柄海鞘含有89.84%(超临界CO2提取)和75.78%(乙酸乙酯提取)的多不饱和脂肪酸,玻璃海鞘含有69.77%(超临界CO2提取)和61.11%(乙酸乙酯提取)的多不饱和脂肪酸.对丹参进行系统的化学成分研究,从中分离并鉴定出7个化合物,即丹参酮I、丹参酮IIA、隐丹参酮、二氢丹参酮、丹参酮IIB、紫丹参酮甲素和齐墩果酸.以海鞘油脂为底物,用OSI仪测定了几种丹参酮类化合物的抗氧化活性,结果表明二氢丹参酮和丹参酮I是很好的油脂抗氧化剂,添加量为0.01%时,就可使油脂的氧化稳定性提高3~4倍.     

丹参中丹参酮的提取及其薄层色谱定性分析

本文探讨了采用工业甲醇、乙醇两种有机溶剂,对丹参中丹参酮进行提取,并利用薄层层析法对丹参酮的有效成份丹参酮ⅡA、丹参酮Ⅰ进行分离与鉴定.该方法的优点在于简便易行,得率较高,分离效果好,适合用于化学实验教学中。     

甘草黄酮提取分离及药理活性研究进展

甘草是我国传统的中药材,含有多种生物活性成分,黄酮类化合物是其主要活性成分之一,具有抗炎抑菌、抗氧化、抗肿瘤等多种药理活性,在医药、保健、食品等行业具有巨大的应用前景.对甘草黄酮的化学成分、提取分离工艺及药理活性进行了较为全面的阐述,旨在为甘草黄酮类化合物的进一步研究提供理论参考.     

药对丹参-当归作用阿尔茨海默病的网络药理学机制研究

为了研究药对丹参-当归作用于阿尔茨海默病的可能机制,通过中药系统药理学分析平台(TCMSP)筛选出丹参、当归的活性成分,寻找其相关的潜在靶点;并通过预测平台人工检索候选化合物的潜在靶点是否与阿尔茨海默病相关;将靶点信息通过DAVID数据库、KEGG数据库进行靶点和通路分析;构建化合物-靶点作用网络,靶点-通路网络图,化合物-靶点-通路图.结果表明:药对丹参-当归中具有潜在作用阿尔茨海默病活性的成分有β-谷甾醇,豆甾醇,丹参酮Ⅱ、丹参新酮、隐丹参酮、二氢丹参酮,其可能通过抗炎、抗氧化、免疫系统、细胞周期、钙信号通路、神经受体-配体相互作用等机制对阿尔茨海默病起作用.     

甘草多糖的化学与药理研究

综述了甘草多糖的提取方法、化学组分、药理作用等方面的研究进展.现代提取方法较传统方法简便快捷,甘草多糖产量高,且不会影响多糖的结构和活性.研究表明,甘草多糖主要由鼠李糖、葡聚糖、阿拉伯糖和半乳糖组成,但其主链结构的研究结论不尽相同.药理研究发现,甘草多糖具有免疫调节、抗肿瘤、抗病毒等作用,而且无细胞毒作用.     

丹参脂溶性成分的化学研究

研究了丹参脂溶性化学成分.采用硅胶柱色谱,Sephadex LH-20和HPLC等色谱技术进行分离和纯化,根据波谱数据对化合物进行结构鉴定.从丹参的乙醇提取物中分离得到11个化合物,分别鉴定为2,3-反式-4,5-顺式-二烯-6-羰基硬脂酸(1)、丹参螺旋缩酮内酯(2)、丹参酮Ⅰ(3)、丹参酮ⅡA(4)、二氢丹参酮Ⅰ(5)、二氢异丹参酮Ⅰ(6)、异隐丹参酮(7)、丹参酸甲酯(8)、弥罗汉酚(9)、Sibiriqninone A(10)、Sibiriqninone B(11).化合物1为新化合物,命名为2,3-反式-4,5-顺式-二烯-6-羰基硬脂酸.     

从土壤中快速提取纯化DNA方法的建立

比较了从土壤中提取及纯化DNA的不同方法,确立了TENS-乙酸铵提取方法和PVPP柱层析的纯化方法.结果显示:TENS-乙酸铵提取方法对不同土壤均有较好的提取效果,DNA片段长度在23.1 kb以上,且无明显降解;PVPP柱层析的纯化方法比胶回收纯化方法的DNA回收效率高、质量好,可用于PCR扩增.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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