高效液相色谱法测定预混料中维生素E的含量

建立了一种用高效液相色谱法测定维生素E的方法.色谱柱为PRONTOSIL 120-5-C18-ace-APS 4.6 mm×250 mm,5.0μm,流动相为甲醇,流速1.0 mL/min,紫外检测波长285nm,柱温为常温.结果表明,维生素E醋酸酯的含量在0.0342~0.342 mg/mL有良好的线性关系,平均回收率为101.87%,精密度RSD为1.5%.该方法简便、快速,用于预混料中维生素E含量的测定,获得满意的结果.     

色谱法在国内维生素E测定中的应用研究进展

综述了测定维生素E时常用的气相色谱法与高效液相色谱法的主要方法、原理及样品前处理程序和方法,提出了各种方法目前存在的问题以及今后的研究方向和重点.     

黄山栾果与栾果中维生素含量的研究

用高效液相色谱法测定了黄山栾果与栾果中的维生素A，D，E含量，结果表明：黄山栾果中维生素A的含量为22．29～70．28IU/g，维生素D2为0．223～2．117IU／g，维生素E为0．254-3．059mg／100g；栾果中维生素A的含量为43．95—91．71IU／g，维生素D2为0．035—2．707IU／g，维生素E为0．165-7．002mg/100g．综合其营养价值，黄山栾果和栾果在产品开发和利用上有较广阔的前景．     

六味止痛胶囊质量标准研究

为建立控制六味止痛胶囊的质量标准,采用薄层色谱法对胶囊中的当归、诃子、藏菖蒲进行鉴别,采用高效液相色谱法测定阿魏酸的含量.结果表明,薄层色谱法可以对制剂中的当归、诃子、藏菖蒲做出准确鉴别,利用高效液相色谱法可以测定出阿魏酸的含量.该方法灵敏、简便,重现性好,可有效控制制剂的质量.     

碘酸钾对杜氏盐藻抗氧化能力的影响

以杜氏盐藻为材料,研究碘酸钾对其抗氧化物质含量及清除自由基能力的影响.当在杜氏盐藻培养液中添加不同质量浓度的碘酸钾时,藻体内黄酮、β–胡萝卜素和维生素E含量不同程度地升高.培养液中碘酸钾的质量浓度为4.0,g/L时,藻体内黄酮的含量增幅最大,为对照的126.3%,碘酸钾的质量浓度为0.4,g/L时,藻体内β–胡萝卜素和维生素E的含量增幅最大,分别为对照的121.6%和126.7%.不同质量浓度的碘酸钾处理后,杜氏盐藻提取物清除超氧阴离子自由基(O2.)和羟自由基(.OH)的能力也有不同程度地增强,其中增幅最大的碘酸钾质量浓度是0.4,g/L.以上结果表明,碘酸钾处理可以增强杜氏盐藻的抗氧化能力.     

忍冬不同器官3种活性成分的测定

研究忍冬不同器官绿原酸、维生素C和可溶性蛋白质含量，对进一步了解忍冬药用价值具有重要的意义。采用高效液相色谱法测定绿原酸含量；2，6-二氯酚靛酚滴定法测定维生素C含量；考马斯亮蓝G-250法测定可溶性蛋白质含量。结果显示忍冬花和花蕾中绿原酸、维生素C和蛋白质含量均较高。     

高效液相色谱法测定饮料中苯甲酸的不确定度分析

根据测量不确定度的评定理论,通过高效液相色谱法测定饮料中的苯甲酸含量,分析了整个测试过程中的不确定度来源,探讨了测试方法中苯甲酸的不确定度评价方法,为高效液相色谱法测定饮料中苯甲酸含量的不确定度评价提供参考。     

猕猴桃中维生素C的高效液相色谱分析

用0.1%的草酸作为流动相,高效液相色谱法测定了猕猴桃中维生素C的含量.当维生素C浓度在0～500μg/mL范围内浓度与色谱峰面积呈正比关系,标准工作曲线线性相关系数为0.9915.实验结果表明:国产陕西猕猴桃维生素C含量最高,含量为234.41 mg/100 g,进口新西兰金果维生素C含量次之,含量为187.33 mg/100 g,进口新西兰绿果维生素C含量最低,含量为109.42 mg/100 g.     

40%灭铃特乳油分析方法的研究

灭铃特乳油中各有效成分的全分析方法，用气相色谱及液相色谱技术对灭铃特乳油中的高效氯氰菊酯、辛梳磷和甲基对硫磷进行了测定，再用气相色谱法测定氯氰菊酯的总酯含量；然后，用正相液相色谱法分离异构体，求出高效体含量；甲基对硫磷和辛硫磷的测定采用反相高效液相色谱法同时进行测定，结果令人满意。     

30%灭铃光乳油分析方法的研究

首次报道了灭铃光乳油中各有效成分的全分析方法。采用了气相色谱法及液相色谱技术对灭铃光乳油中的高效氯氰菊酯，辛硫磷和马拉硫磷进行了测定。采用气相色谱法测定氯氰菊酯的总酯含量，然后用正相液相色谱法分离异构体，求出高效体含量，采用反相高效液相色谱法测定辛硫磷的含量；采用气相色谱法测定马拉硫磷的含量，本法用于实际样品分析，结果令人满意，并与理论进行对照，结果吻合，建立了一个适宜于工厂质量控制的全分析方法。     

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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