高效液相色谱法同时测定罗布麻浸膏粉中金丝桃苷、异槲皮苷、槲皮素的含量

采用HPLC法同时测定罗布麻浸膏粉中金丝桃苷、异槲皮苷、槲皮素的含量.色谱柱为YMC-Pack C18(250×4.6 mm),流动相为乙腈-甲醇(10∶1)和0.4%磷酸,梯度洗脱;二极管阵列检测器:检测波长360 nm;分别以金丝桃苷、异槲皮苷、槲皮素对照品为外标,用标准曲线法进行定量.在0.25~10μg/mL的范围内,金丝桃苷、异槲皮苷、槲皮素的浓度与吸收峰面积之间线性关系良好,相关系数分别为r金丝桃苷=0.999 4、r异槲皮苷=0.999 5、r槲皮素=0.999 6,回收率在85.57%~99.96%之间(RSD小于4.45%).     

五子衍宗丸细胞干预液的制备及其抗NTDs细胞凋亡的作用研究

采用超高效液相色谱法对五子衍宗丸中金丝桃苷的含量进行了测定,并比较了70℃蒸馏水、常温蒸馏水、体积分数70%乙醇、无水乙醇和DMSO等5种溶剂对金丝桃苷的提取效果;在此基础上,优选出细胞干预液制备方法,观察五子衍宗丸对NTDs细胞凋亡的防控作用。结果显示,金丝桃苷在0.004~0.1μg范围内具有良好的线性关系(r=0.999 9);平均回收率为98.85%,RSD为3.86%;5种提取溶剂中体积分数为70%乙醇对金丝桃苷的提取效果最好;以五子衍宗丸70%乙醇提取物干预NTDs细胞,能够明显提高细胞存活率,有效抑制细胞凋亡。     

高效液相色谱-串联质谱法对贯叶连翘中4种黄酮醇类化合物抗氧化活性的定量研究*

建立了高效液相色谱-串联质谱(HPLC-ESI/MS)法对芦丁、金丝桃苷、槲皮素和槲皮苷的抗氧化活性进行定量研究。样品用甲醇溶解,采用Hewlett Packard ODS Hypersil C_(18)色谱柱(100 mm×4.6 mm,5μm)、0.1%甲酸水-甲醇为流动相梯度洗脱,流速0.6 m L·min~(-1),柱温25℃;电喷雾源,负离子模式多反应选择离子检测(MRM),用于定性、定量的母离子和子离子分别为m/z 609→300(芦丁)、m/z 463→300(金丝桃苷)、m/z 301→151(槲皮素)、m/z 447→300(槲皮苷),采用外标法进行定量分析。结果表明:芦丁、金丝桃苷、槲皮素和槲皮苷在0.5~1 600 ng·mL~(-1)范围内线性关系良好(R0.998),定量限为0.5 ng·m L~(-1),仪器精密度良好(RSD3.0%),样品反应液在24 h内稳定性良好。本方法具有灵敏度高,分析时间短等特点,相对于其他检测方法,提高了检测的准确性,适用于对贯叶连翘中黄酮醇类化合物抗氧化活性的定量研究。经计算,芦丁、金丝桃苷、槲皮素和槲皮苷对ABTS~(.+)的清除率分别为18.35%、36.28%、41.50%和37.18%。     

高效液相色谱法测定短梗五加中金丝桃苷和异嗪皮啶含量

建立HPLC测定短梗五加果实中异嗪皮啶和金丝桃苷含量的方法.用Waiers e2695-C18色谱柱(4.6nm×150nm,5μm)以乙腈-水溶液比例为(20∶80)为流动相,流速为1.0 mL/min,柱温:30℃,检测波长355nm.异嗪皮啶进样量在10μL内具有良好的线性关系,y=151 334 510 x+5 939 724,R2=0.939 3.异嗪皮啶的平均回收率为101.02%,RSD为2.09%.金丝桃苷进样量在10μL内呈良好的线性关系,y=27 639 620 x+76 443,R2=0.999 9.平均回收率为99.7%,RSD为2.02%.HPLC灵敏快速,结果准确,重现性好,可以用于短梗五加果实中金丝桃苷和异嗪皮啶的含量测定.     

不同产地广山楂中金丝桃苷含量比较

采用高效液相色谱法测定不同产地的广山楂中金丝桃苷的含量。色谱柱：C18-ODS、流动相：乙腈-0.1%磷酸水溶液（12∶88）、流速：1ml/min、检测波长：360nm、柱温：30℃。结果表明：金丝桃苷在进样量为0.032～1.28μg的范围内呈良好的线性关系（r=0.9999）,平均回收率为98.9%,RSD值为2...     

HPLC测定大理苍山两种鹿蹄草中金丝桃苷的含量

目的：通过测定大理苍山两种不同鹿蹄草中金丝桃苷的含量,为控制鹿蹄草的质量和临床应用提供理论依据。方法：HPLC测定金丝桃苷含量的色谱条件：ZORBAX SB-C18色谱柱（4.6mm×150mm,5μm）,流动相：甲醇∶水（35∶65）,检测波长：358nm,进样量：8.00μl,流速：1.0ml/min,柱温：25℃。结果：金丝桃苷的线性范围为0.18～0.90μg（r=0.9991）,回收率为100.60%（RSD=1.78%）。结论：两种鹿蹄草中金丝桃苷的含量存在差异。     

HPLC法同时测定小花鬼针草中3种黄酮类成分含量

建立了HPLC法同时测定小花鬼针草中芦丁、金丝桃苷和槲皮苷含量的方法。采用Diamonsil C18色谱柱(4.6 mm×250 mm,5μm),流动相为乙腈-0.2%冰醋酸梯度洗脱,流速为1 mL/min;检测波长为360 nm。结果表明,芦丁、金丝桃苷和槲皮苷在0.50~12.50μg/mL(r=0.999 9)、0.49~12.35μg/mL(r=0.999 8)、0.42~10.55μg/mL(r=0.999 5)范围内线性良好,平均回收率为99.37%(RSD=0.56%)、99.35%(RSD=0.57%)、99.68%(RSD=0.56%)。该方法简便、准确、重现性好,可用于同时测定鬼针草中3种黄酮成分的含量。     

刺玫果提取物胶囊定性定量研究

建立刺玫果提取物胶囊的定性鉴别和含量测定方法.采用薄层色谱法对刺玫果提取物胶囊进行了定性分析;采用紫外-可见分光光度法,建立了刺玫果提取物胶囊总黄酮的含量测定方法;采用高效液相色谱法,建立了刺玫果提取物胶囊中金丝桃苷的含量测定方法.结果表明建立的薄层色谱鉴别方法,荧光斑点清晰,阴性无干扰;芦丁在4.0~48.0μg/mL(r=0.9996),金丝桃苷在0.192~1.152μg(r=0.9999)线性关系良好;芦丁平均回收率100.05%,RSD为1.40%(n=6);金丝桃苷平均回收率99.39%,RSD为0.66%(n=6).建立的薄层鉴别方法专属性高,含量测定方法具有良好的精密度,结果准确可靠,可用于刺玫果提取物胶囊的质量控制.     

山楂叶提取物中牡荆素、金丝桃苷、异槲皮苷对照品的制备

采用高速逆流色谱结合半制备液相色谱技术快速分离山楂叶中低含量的牡荆素、金丝桃苷、异槲皮苷单体。以氯仿-甲醇-水-正丁醇(4∶3∶2∶1.5,V/V)为溶剂系统,流速为5.0 m L/min,转速为850 r/min,检测波长为254 nm,从山楂叶黄酮提取物中富集得到含牡荆素、金丝桃苷、异槲皮苷3种化合物的混合组分,经半制备液相进行二次分离纯化,得到纯度大于98%的牡荆素、金丝桃苷、异槲皮苷单体。研究结果表明,该技术对山楂叶中低含量黄酮类化合物的分离快速、高效,且纯度高。     

不同产地金银花中4种黄酮成分的含量测定

目的采用HPLC建立金银花中芦丁、金丝桃苷、木犀草苷、木犀草素4种黄酮成分含量测定的方法,分析不同产地金银花中这4种成分的含量差异,为评价金银花药材质量提供参考。方法色谱柱为Agilent Eclipse XDB-C18(250 mm×4.6 mm, 5μm),流动相为乙腈-0.5%冰醋酸,梯度洗脱,流速1 mL·min~(-1),检测波长350 nm,柱温30℃。结果 4种成分均达到基线分离,线性关系良好(r≥0.9996),平均加样回收率为99.51%～100.35%,RSD2%,建立的方法简便快速,准确度高,重现性好。结论不同产地金银花中芦丁和木犀草苷的含量差异较大,而金丝桃苷和木犀草素的含量均较低,差异较小。本实验为金银花药材的质量评价提供了一定的科学依据。     

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.     

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     

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

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