HPLC测定乌药叶中槲皮素的含量

目的:建立高效液相色谱测定乌药叶中槲皮素含量的方法。方法:色谱柱(ZORBAX ECLIPSE XDB-C18,150 mm×4.6 mm,5μm),以甲醇∶0.4%磷酸=50∶50为流动相,流速:1.0 mL/min,检测波长:360 nm,柱温:30℃。结果:槲皮素在0.129μg～1.29μg内线性关系良好(r2>0.9999);重复性RSD为4.2%;平均加样回收率为101.0%,RSD为2.37%。结论:该方法专属性强,简便快捷,结果准确,可用作乌药叶槲皮素的含量测定。     

HPLC法测定沙棘籽粕中槲皮素山柰酚和异鼠李素的含量

目的:建立高效液相色谱测定沙棘籽粕中槲皮素、山奈酚和异鼠李素含量测定方法.方法:采用Kromasil C18(4.6㎜×250㎜,5μm)色谱柱,流速1 mL/min.流动相:甲醇-水(含磷酸0.04%)为50∶50;检测波长为360 nm;柱温35℃.结果:3种成分均达到基线分离,槲皮素、山奈酚和异鼠李素的线性范围分别为0.0895~1.79μg(r=0.9998),0.0565~1.13μg(r=0.9999),0.088~1.76μg(r=0.9997);回收率为100.7%(RSD=2.1%),98.5%(RSD=1.7%),100.5%(RSD=1.5%).结论:此方法简便、重现性良好、结果准确可靠,可用于槲皮素山柰酚和异鼠李素的含量测定.     

HPLC法测定不同时间采集照山白中槲皮素的含量

目的:比较采集时间不同的照山白中有效成分槲皮素的含量,制定最好的采集时间.方法:采用HPLC法,Centur SILC18-EPS色谱柱(200×4.6 mm,5μm)流动相为甲醇-0.2%磷酸(40:60),检测波长为360nh.测定不同采集时间10批照山白中槲皮素的含量.结果:槲皮素的平均回收率99.94%;RSD为2.14%;10批样品中槲皮素的含量最高的是9月份采集药材.结论:照山白中槲皮素的含量随着采集时间不同而变化.     

RP-HPLC-PDAD法测定青叶胆中齐墩果酸和熊果酸的含量

目的建立了青叶胆中齐墩果酸和熊果酸的反相高效液相色谱-光电二极管阵列检测器(RP-HPLC-PDAD)定量分析方法。方法采用95%乙醇为溶剂超声提取,色谱柱为Kromasil C18柱(4.6mm×250 mm,5μm),柱温30℃。以甲醇∶水∶磷酸(88∶12∶0.15,v/v/v)为流动相等度洗脱,流速0.9 m L·min-1,采用光电二极管阵列检测器进行检测,检测波长210 nm。结果齐墩果酸进样量在0.1048~2.6200μg时,与峰面积呈良好的线性关系(r=0.9999),平均回收率为96.9%,RSD为1.7%(n=9);熊果酸进样量在0.2304~5.7600μg时,与峰面积呈良好的线性关系(r=0.9999),平均回收率为97.5%,RSD为1.5%(n=9)。结论方法准确,操作简便,数据可靠,可用于青叶胆中齐墩果酸和熊果酸的含量测定。     

HPLC法测定克糖片剂中的槲皮素

测定克糖片剂中槲皮素的质量比.采用高效液相色谱法,Hypersil C18柱,流动相为甲醇-0.3%磷酸(60∶40,V∶V),流速为1.0 mL/min,柱温为室温,柱长为250 mm,检测波长为360 nm.槲皮素的线性范围为0.2~1.0μg(r=0.999 9),槲皮素的平均加样回收率为99.57%(RSD为0.51%).最终计算得出平均含槲皮素0.052 7 mg/片,RSD为0.48%.本方法可简便快捷的测得克糖片剂中槲皮素的质量比.     

高效液相色谱法测定当归中阿魏酸的含量

目的:建立一种高效液相色谱法测定当归中阿魏酸的含量.方法:采用高效液相色谱法,色谱柱为TIANHE C18(250 mm×4.6 mm,5μm),以甲醇-水-冰醋酸(40∶60∶0.5)为流动相,流速为1 mL/min,检测波长为320 nm.结果:阿魏酸在0.036~0.216μg范围内,线形关系良好(r=0.9999),平均回收率为101.4%(n=5),RSD为0.76%.结论:该方法测定阿魏酸含量简便、快捷、准确.     

青海荨麻中一种主要药用成分的含量测定

目的：采用高效液相色谱法测定青海宽叶荨麻中槲皮素的含量.方法：采用Hypersil C18色谱柱（4.6mm×250mm,5μm）;流动相：甲醇-水-磷酸（45∶55∶0.05）,检测波长：360nm,流速：1.0mL.min-1,柱温：30℃.结果：槲皮素在5.46～54.6μg.mL-1的浓度范围内呈良好线性关系（r=0.9993）,回收率为99.3%（RSD=2.0%,n=6）.结论：本方法简便、快速、准确、灵敏度高、重现性好,可为青海宽叶荨麻质量评价提供有效手段.     

HPLC法测定黄豆苷元胶囊的含量

建立HPLC法测定黄豆苷元胶囊的含量.方法:采用Hypersil ODS 色谱柱,(4.6 mm ×150 mm,5 μm),流动相水-乙腈(70∶30),流速为1 mL·min-1,检测波长249 nm,柱温30 ℃,进样量15 μL.结果:在1.0～20.0 μg·min-1浓度范围内线性关系良好,方法回收率为101 98%,RSD为1.45% (n＝9),精密度良好.结论:本方法灵敏、准确、专属性强,用于该制剂含量测定结果满意.     

高效液相色谱法测定红景天软胶囊中的红景天苷

本研究旨在建立高效液相色谱法测定红景天软胶囊中红景天苷含量的方法,为红景天软胶囊提供检测和质量控制参考。用甲醇对样品进行超声处理,色谱条件为色谱柱(C18,4.6 mm×250 mm,5.0μm),流动相为甲醇∶水=15∶85(V∶V),柱温为35℃,检测波长为215 nm,流速为1.0m L·min-1,外标法定量。结果表明,红景天苷在0.021~0.114 mg·m L-1范围内具有良好的线性关系(r2=0.99966),平均回收率为98.14%(n=9)。此法操作简单快速,准确性和重现性好,可作为红景天软胶囊中红景天苷含量的检测方法。     

HPLC法测定不同产地牡丹皮中丹皮酚的含量

为建立测定牡丹皮中丹皮酚含量的高效色谱方法,采用HPLC法,色谱柱SupelcosilTMLC18柱(4.6mm,5μm×150mm);流动相:甲醇-醋酸-水(58∶2∶40),流速1mL/min,检测波长:274nm;柱温为室温。结果丹皮酚在(0.01～0.55)μg/mL范围内线性关系良好(r=0.9996),平均回收率99.87%,RSD为1.46%。该法简便、快速,重现性好,适用于牡丹皮中丹皮酚的定量分析。     

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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