水相中对羟基苯甲酸分子印迹聚合物的制备及异构体识别

以对羟基苯甲酸为模板分子,2-乙烯基吡啶为功能单体,在甲醇-水体系中制备了以对羟基苯甲酸为模板的分子印迹聚合物。通过高效液相色谱评价,该固定相对对羟基苯甲酸及其异构体分离效果良好。     

亲水性尿苷分子印迹聚合物的制备及分子选择性识别

研究亲水性核-壳结构分子印迹聚合物的制备并考察其吸附、分离性能.以尿苷为模板分子,通过回流沉淀聚合方法(DPP)制备亲水性的核-壳结构分子印迹聚合物微球.研究了模板分子UR与功能单体MMA之间的相互作用,考察了分子印迹聚合物对模板分子的吸附动力学、吸附平衡以及吸附选择性,评价了该分子印迹聚合物作为高效液相色谱柱填料时对尿苷及其类似物的分离能力.UR分子印迹聚合物对UR的吸附符合准一级动力学方程;Freund lich等温方程能更好地拟合分子印迹聚合物对印迹分子尿苷的等温吸附数据;UR分子印迹色谱柱能够实现UR及其类似物的分离,对尿苷具有选择性识别性能.     

分子印迹技术的原理与研究进展

分子印迹是制备具有分子特异识别功能聚合物的一种技术．本文介绍了分子印迹技术的基本原理与印迹聚合物的制备方法,综述了该技术在色谱、固相萃取、药物分析、生化分离、生物传感器技术以及生物催化方面的研究与应用,并对未来的发展方向进行了展望．     

分子印迹技术在毒物毒品检验中的应用

本文综述了分子印迹技术的研究进展、作用原理以及其在分析领域,特别是毒物毒品检验领域的应用。分子印迹聚合物具有对模板分子的专一选择性、物理和化学性质的稳定性、对环境的适应性等优点;分子印迹聚合物作为固相萃取、固相微萃取、色谱分离以及化学传感器的功能材料,可应用于生物、医药、环境样品等复杂基质中痕量物质的分析,并已应用于毒物毒品检验。     

甲基对硫磷分子印迹整体柱的制备及其在固相萃取中的应用

以甲基对硫磷为模板分子,采用原位逐步聚合法制备了具有良好识别性能的分子印迹聚合物(MIP)整体柱,系统考察了甲基对硫磷与其结构类似物在该柱上的选择性分离富集特性.用聚合物整体柱固相萃取了蜂蜜中的甲基对硫磷.结果表明,聚合物整体柱对模板分子产生了印迹效应,对甲基对硫磷有明显的选择性.本文以采用C18色谱柱,以甲醇-水(体积比为85:15)为流动相,流速为1.0mL/min,吸收波长为270nm,可在15分钟实现甲基对硫磷的测定.     

对羟基苯甲酸分子印迹聚合物中模板分子的洗脱

以对羟基苯甲酸为模板分子,丙烯酰胺为功能单体,采用悬浮聚合法制备对羟基苯甲酸分子印迹聚合物,通过索氏提取和超声波/离心提取工艺洗脱模板分子,利用扫描电镜对洗脱后的印迹聚合物进行表征,并对洗脱后聚合物的吸附性能进行评价.实验结果表明,与索氏提取工艺相比,超声波/离心提取工艺在16.5h内快速地洗脱印迹聚合物,洗脱后的印迹聚合物的形貌呈微球形状,粒径分布在0.5~6μm之间,对模板分子具有良好的吸附性能.采取该方法可以快速检测环境中的对羟基苯甲酸.     

孔雀石绿分子印迹聚合物的合成及吸附性能研究

采用本体聚合法制备了孔雀石绿分子印迹聚合物.用紫外光谱、红外光谱研究了印迹聚合物的结合位点和识别机理;用扫描电镜对聚合物进行了表面形态分析;自制分子印迹固相萃取柱,研究聚合物对孔雀石绿的分离富集效果.结果表明,模板分子和功能单体通过氢键或离子键作用形成1:2型配合物;印迹聚合物粒径分布在45～80μm之间,表面富含微孔结构,有利于对孔雀石绿的吸附.实际样品测定表明,印迹聚合物具有较好的分离富集效果,可以满足痕量孔雀石绿的测定.     

表面分子印迹法制备棉酚印迹聚合物及其性能检测

分子印迹技术是高聚合物质对特定目标分子进行选择性识别和分离的技术,可以对目标分子进行高灵敏的检测和分离,因而得到广泛应用。制备了一种基于氧化硅的表面分子印迹聚合物,提高了传统印迹聚合物的结合率。在对表面分子印迹聚合物结合率和特异性的实验中,可知以甲基丙烯酸为单体,氯仿为致孔剂制备的表面分子印迹聚合物结合率和特异性最好,其k值和k’值分别为3.2和2.791。同时,该方法与高效液相色谱(high-performance liquid chromatography-ultraviolet HPLC-UV)进行了比较,发现表面分子印迹聚合物(I值为3.85)对棉酚的检测优于HPLC-UV(I值为2.28)。     

分子印迹技术应用:真菌发酵液中紫杉醇的分离富集

紫杉醇是一种二萜类化合物,主要具有抗癌活性.以紫杉醇为模板分子合成分子印迹聚合物,并从吸附动力学和吸附等温曲线两方面对聚合物的吸附性能进行评价,结果表明此印迹聚合物具有一定的吸附能力.将合成的印迹聚合物作为固相萃取材料从真菌发酵液中分离富集紫杉醇,粗提物经过分子印迹柱萃取后,能够专一性的富集紫杉醇.通过建立快速、简便的富集紫杉醇的分离体系,将为具有显著抗癌作用的紫杉醇的临床应用奠定基础,具有很好的应用前景.     

硅胶表面茶碱分子印迹聚合物的制备和性能研究

以茶碱作为模板分子,通过对硅胶表面进行修饰后进行接枝共聚,制备了基于硅胶表面修饰的分子印迹聚合物.借助红外,元素分析,电镜等表征方法对聚合物的制备进行了评价和探讨.用紫外分光光度法考察了分子印迹聚合物对茶碱的吸附特性.实验表明这种分子印迹聚合物对茶碱表现了特异性吸附,而对相似化合物咖啡因则无吸附,并用薄层色谱对聚合物的分离性能进行了研究.     

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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