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。     

药用植物丹参中丹参酮IIA的提取分离工艺研究

石油醚、乙酸乙酯作为萃取剂,利用聚酰胺凝胶柱分离,乙醇/水梯度洗脱以分离丹参(Salvia miltiorrhiza),得到丹参酮ⅡA.所得到的产物经过核磁共振谱(1H NMR、13C NMR)确证了结构,并经薄层色谱(TLC)、高效液相色谱(HPLC)分析,显示其纯度达到93%以上.本研究提供了一种高效的丹参酮ⅡA的提取分离方法,具有提取率高、成本低、安全可靠等优点,也为其他药用植物有效成分的分离提供参考.     

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.     

毛细管胶束电动色谱法同时测定丹参及其中成药中的水溶性和脂溶性成分

建立了应用毛细管胶束电动色谱法 (MECC)同时分离测定丹参及其中成药中水溶性成分原儿茶醛、原儿茶酸和脂溶性成分丹参酮ⅡA的方法 .在最佳分离条件下 ,原儿茶醛、原儿茶酸和丹参酮ⅡA的峰面积与浓度之间有着良好的线性关系 ,检测限分别为 :0 .5 0 μg mL ,0 .2 5 μg mL和 1.0 μg mL .该方法被成功用于丹参及其他 3个中成药中水溶性和脂溶性成分的测定     

丹参注射剂中丹参酮Ⅱ_A的含量测定及贮存期的预测

本文通过建立丹参注射剂中丹参酮ⅡA含量测定的高效液相色谱方法,并考察丹参注射液和丹参粉针剂两种剂型的贮存期.采用以丹参酮ⅡA为指标成分,经典恒温法,预测和比较了丹参注射液和丹参粉针剂的贮存期.结果表明,丹参酮ⅡA的含量随温度升高和时间延长逐渐下降.经典恒温法测定得丹参注射液中丹参酮ⅡA贮存期0.43年,其在粉针剂中贮存期可达2年以上.故制备中药冻干粉针的方法可以提高中药注射剂有效成分稳定性,延长有效期.     

高效液相色谱法测定丹参及其复方制剂中的3个丹参酮

建立了同时测定丹参及其复方制剂中隐丹参酮、丹参酮Ⅰ和丹参酮ⅡA的反相高效液相色谱法.采用Waters Spherisorb ODS2（5μm,4.6 mm i.d.×250 mm）为色谱柱,V（甲醇）∶V（0.1％磷酸）=85∶15混合溶液为流动相,检测波长为254 nm,流速为1.0 mL/min.在上述色谱条件下隐丹参酮、丹参酮Ⅰ和丹参酮ⅡA在10 min内实现有效分离和准确测定,加标回收率在90％～110％之间.方法简单、快速、准确.     

HPLC法测定中江丹参植株不同部位丹参酮Ⅰ、丹参酮Ⅱ的含量

目的:建立高效液相色谱法同时测定丹参植株中不同部位丹参酮Ⅰ、丹参酮Ⅱ两种脂溶性成分的含量。方法:采DiamonsilTM C18色谱柱(250 mm×4.6 mm,5μm),流动相:甲醇-水(84:16),柱温:35℃,流速为1.0 mL/min,检测波长268 nm。结果:在此色谱条件下2种成分可完全分离。丹参酮Ⅰ、丹参酮Ⅱ的线性范围分别为0.000 51～0.10μg(r=0.999 9),0.002 9～0.058μg(r=0.999 7)。平均回收率丹参酮Ⅰ为98.7%(RSD为1.2%),丹参酮Ⅱ为100.2%(RSD为1.7%)。实验结果可为中江丹参植株地上部位的开发利用提供科学依据。     

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%.     

甘肃丹参化学成分研究及4种丹参酮含量的高效液相层析法…

甘肃丹参鉴定为唇形科鼠尾草属植物甘西鼠尾草从干燥根乙醇提取物中分得９个化合物，经波谱分析和理化常数测定确定其结构为丹参酮Ｉ，丹参酮ⅡＡ，隐丹参酮，二氢丹参酮，羟基丹参酮，丹参酮ⅡＢ，紫丹参酮乙素，齐墩果酸和β－谷甾醇。同时利用高效液相色谱对４种主要丹参酮含量进行了测定。     

甘肃丹参化学成分研究及4种丹参酮含量的高效液相层析法测定

甘肃丹参鉴定为唇形科鼠尾草属植物甘西鼠尾草（ＳａｌｖｉａｐｒｚｅｗａｌｓｋｉＭａｘｉｍ）．从干燥根乙醇提取物中分得９个化合物，经波谱分析和理化常数测定确定其结构为丹参酮Ｉ，丹参酮ⅡＡ，隐丹参酮，二氢丹参酮，羟基丹参酮，丹参酮ⅡＢ，紫丹参酮乙素，齐墩果酸和β－谷甾醇．同时利用高效液相色谱对４种主要丹参酮含量进行了测定     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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