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.     

UPLC-MS/MS法同时测定川黄口服液中的5种有效成分

建立同时测定川黄口服液中的原儿茶醛、黄芪甲苷、黄芪皂苷Ⅱ、隐丹参酮、丹参酮ⅡA 5种有效成分含量的超高效液相色谱-串联质谱(UPLC-MS/MS)分析方法.用C18(50mm×2.1mm,1.8μm)分析柱,乙腈-0.1%甲酸水为流动相,流速为0.35 mL/min.在电喷雾电离(ESI)正离子和负离子模式下,采用的是多重反应监测模式(MRM)进行检测.结果表明,原儿茶醛、黄芪甲苷、黄芪皂苷Ⅱ、隐丹参酮、丹参酮ⅡA的线性范围分别为0.3~12.0mg/L、0.3~7.2mg/L、0.15~6.00mg/L、0.005~2.000mg/L、0.005~1.000mg/L;5种成分的加样回收率为78.5%~102.0%;相对标准偏差均不大于4.01%.本方法简便、准确、快速、重复性好,高灵敏度,可作为川黄口服液质量评价指标之一.     

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。     

丹参主根和须根中主要酚酸类成分的分析

通过超高效液相色谱-四极杆-飞行时间质谱(UHPLC-Q-TOF/MS)联用技术对丹参主根和须根中的主要酚酸类成分进行有效的鉴定和相对定量分析.色谱分离采用沃特世ACQUITY UPLC HSS T3色谱柱(2.1 mm×100 mm,1.8μm),流动相(体积分数为0.2％的甲酸-乙腈)以0.3 mL/min流速梯度...     

超高效液相色谱法测定卷烟主流烟气中的苯酚

建立了超高效液相色谱测定卷烟主流烟气中的苯酚的方法.卷烟主流烟气用剑桥滤片捕集,滤片用1%乙酸水溶液超声提取,以ACQUITY UPLC BEH Shield RP18(2.1mm×50mm,1.7μm)色谱柱为固定相,1%醋酸溶液和V(醋酸)∶V(乙腈)∶V(水)=1∶30∶69的混合液为流动相分离,流速为0.6mL/min.用荧光检测器检测,激发波为272nm,发射波长为309nm.在该色谱条件下,苯酚质量浓度在0.186～3.72μg/mL内成良好的线性关系,该法的回收率为97%～102%,相对标准偏差(RSD)为3.25%,检测限1.67ng,每样分析时间仅需2min.     

高效液相色谱法测定丹参冲剂中的丹参酮ⅡA的含量

采用高效液相色谱法测定丹参冲剂中丹参酮ⅡA 的含量。色谱柱为ODS2 (4 .6× 2 5 0mm) ,粒度 5 μm(大连依利特公司 ) ,流动相为甲醇—水溶液 (80∶2 0 ) ,检测波长为 2 70mm ,平均回收率为 97 7% ,RSD =1.3% ,线性关系、精密度及重现性都很好     

高效液相色谱法测定滇丹参中丹参酮Ⅱ A的含量

目的:建立高效液相色谱法测定滇丹参中丹参酮ⅡA的含量。方法:采用ZORBAXSB-C18(4.6mm×150mm,5μm)色谱柱;流动相为甲醇-水(75∶25);柱温25℃;检测波长270nm;流速1.0ml/min;进样量10μl。结果:丹参酮ⅡA在0.0041～0.410 0μg/L范围内线性关系好,r=0.9999(n=6),平均回收率为98.59%,RSD为1.05%。结论:该方法准确、快速、灵敏,可用于滇丹参的质量控制。     

凝胶净化-高效液相色谱法测定烟草中的吡虫啉

研究了用凝胶净化-液相色谱法测定烟草中的吡虫啉,烟草样品中的吡虫啉用乙酸乙酯提取,提取液浓缩后用凝胶净化,然后用高效液相色谱紫外检测测定.采用ZORBAX Stable Bound C18(2.1mm×150mm,3.5m)色谱柱为固定相,V(乙睛)∶V(0.01mol/L乙酸铵)=1∶4混合液为流动相分离,在该条件下,样品中的吡虫啉能达到基线分离.方法的回收率在92%～104%之间,日内相对标准偏差为2.8%,日间相对标准偏差为3.4%.方法可用于烟草中吡虫啉的测定,结果令人满意.     

高效液相色法同时测定丹参酮胶囊中隐丹参酮和丹参酮ⅡA含量

采用高效液相色谱法同时测定丹参酮胶囊中隐丹参酮和丹参酮ⅡA含量,建立丹参酮胶囊质量控制体系。采用C18柱分离测定;甲醇:水(80∶20)为流动相,检测波长:270nm;流速:1.0m l/m in。结果:隐丹参酮和丹参酮ⅡA分别在0.20~160μg(r>0.999 9)、0.21~1.68μg(r>0.999 8)质量范围内线性关系良好;回收率在98.7%~103.0%之间。     

超高效液相色谱法测定不同提取工艺样品中钩藤碱含量

目的:建立使用超高效液相色谱(UPLC)测定钩藤不同提取工艺样品中钩藤碱(Rhychophylline)的含量方法.方法:采用ACQUITY UPLC BEH C18色谱柱(2.1 mm×50 mm,1.7 μm),甲醇-5 mmoI/L乙酸铵水溶液用氨水调pH=9.8(60:40)流动相进行等度洗脱,检测波长为240...     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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     

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