叶蝉散分子印迹电化学传感器制备及其性能研究

首先制备叶蝉散分子印迹聚合物,再将该聚合物自组装至玻碳电极上,将构建的分子印迹电化学传感器用于叶蝉散农药的检测。实验表明,采用差分脉冲伏安法以铁氰化钾、氯化钾的混合液作为底液时,叶蝉散分子印迹传感器对叶蝉散在0~3.3×10-4 mol/L浓度范围内,有良好的线性关系,并且该电极有良好的灵敏度和识别性。利用该传感器测定水果中的农药含量。该分子印迹电化学传感器的线性关系为:In-I0(nA)=8.128 7C-9.327 4,相关系数R2=0.999 6,检出限为1.05×10-8 g/L。     

纳米金/还原氧化石墨烯修饰的盐酸环丙沙星分子印迹电化学传感器

以吡咯和邻苯二胺为功能单体,以盐酸环丙沙星为模板,在纳米金和还原氧化石墨烯(AuNP/rGO)修饰的玻碳电极上,采用电化学方法制备分子印迹聚合物薄膜电化学传感器.利用扫描电镜对修饰电极表面形貌进行表征;电化学技术测试分子印迹传感器性能.研究了纳米金和还原氧化石墨烯用量对电极电化学性能的影响,并对传感器制备和测试条件进行了优化.在优化条件下,分子印迹传感器对盐酸环丙沙星具有宽的线性检测范围(1.0×10^-8～1.0×10^-2 mol/L),低检测限(7.41×10^-12 mol/L(S/N=3)),选择性高,稳定性好.此外,该传感器成功检测出了实际药品和牛奶样品中的盐酸环丙沙星.     

分子印迹传感器对标本中塑化剂直接快速检测

本文构建了能够快速检测邻苯二甲酸二异壬酯(DINP)的分子印迹电化学传感器.首先利用分子印迹技术以热聚合的方法制备了分子印迹聚合物颗粒(MIPs);然后将优化的MIPs与琼脂糖溶液混匀固定在玻碳电极表面制备成DINP分子印迹电化学传感器;传感器可以特异性结合模板分子DINP且其电化学信号与DINP的浓度相关.再利用传感器检测样品中DINP的含量,检测过程不需要样本前处理,可以用于现场直接检测.该方法的线性方程为ΔI=0.03c+3.07,相关系数R~2=0.998,线性范围5×10~(-8)~1×10~(-6),mol/L,检测限为2.7×10~(-8),mol/L,在实际样品中的加标回收率为105.3%,~115.7%,.     

分子印迹阻抗型沙丁胺醇电化学传感器的研究

以对氨基苯硫酚（ATP）为功能单体,沙丁胺醇（SAL）为模板分子,在纳米金修饰玻碳电极上,以电聚合法制备了沙丁胺醇分子印迹聚合物膜.采用扫描电镜和电化学交流阻抗法对该印迹电极修饰电极进行表征;研究与其结构类似的干扰物,如：特伦特罗、特布他林等对SAL测定的影响,结果表明该印迹选择性良好,有较好的重现性和稳定性;以铁氰化钾作为电化学探针,采用电化学阻抗法对SAL进行定量测定,该电极对SAL响应迅速,SAL的阻抗值与其浓度在6.2×10-9～2.4×10-7 mol/L范围内呈良好的线性关系,检测限为3.1×10-9 mol/L.该传感器可用于猪饲料中SAL含量测定.     

一种多巴胺分子印迹的电化学传感器

利用分子印迹技术,结合聚苯胺、多壁碳纳米管和金纳米粒子-丝素蛋白复合物构建新型检测多巴胺的分子印迹电化学传感器。分子印迹聚合物以多巴胺为模板,正硅酸乙酯和苯基三乙氧基硅烷为功能单体合成。当pH值为7.0,模板与单体的物质的量比为1∶5时,该传感器的线性范围为5.0×10-8～9×10-6mol/L,检测限(LOD)为1.02×10-8mol/L。重复实验的相对标准偏差为5.4%。     

印迹电化学传感器对2,4-二氯苯氧乙酸的识别与检测

以2,4-二氯苯氧乙酸(2,4-D)为模板分子,邻苯二胺为功能单体,采用电聚合法在玻碳电极表面合成印迹聚合物,得到印迹聚合物电化学传感器.采用循环伏安法和差示脉冲伏安法对传感器的性质进行了表征.结果表明,该印迹传感器对2,4-D表现出良好的特异性结合能力和识别能力,可从2,4-二氯苯酚、4-氯苯氧乙酸、苯氧乙酸、苦杏仁酸等结构类似物中选择性地识别模板分子.同时,该传感器用于对2,4-D的灵敏检测,响应线性范围为1.0×10-9-2.0×10-7mol/L,检测限为1.8×10-10mol/L(S/N=3).     

双模板分子印迹电化学传感器的构建及同时检测磺胺类抗生素

以磺胺二甲嘧啶和甲氧苄啶两种磺胺类抗生素为模板分子,利用溶胶-凝胶法制备双模板分子印迹聚合物(MIP),并以此作为分子识别元件构筑了磺胺类抗生素分子印迹电化学传感器.采用伏安法和交流阻抗谱对该传感器的电化学性能进行了研究,并对MIP的制备条件和电化学检测参数进行了优化.在优化条件下,该传感器具有良好的选择性,可实现磺胺...     

基于分子印迹技术构建对对硫磷农药选择性响应的电化学平台

以壳聚糖作为基体聚合物、对硫磷为模板分子、以硅酸四乙酯为交联剂制备了对硫磷分子印迹膜.该印迹膜被固定于玻碳电极表面构建了分子印迹膜电极,通过检测示差脉冲伏安信号,实现了对有机农药对硫磷的选择性测定.在优化的实验条件下,峰电流与对硫磷浓度在1-10μg/L（ppb）范围内有良好的线性关系,检测限可达24ng/L（ppt）.该电化学平台的构建为对硫磷的选择性测定提供了新的途径.     

压电磁性表面分子印迹传感器对氯霉素的检测

将磁性表面分子印迹技术与压电传感器结合,研究了一种氯霉素的检测的新方法。合成的氯霉素磁性表面分子印迹聚合物是以磁性纳米颗粒为载体,以甲基丙烯酸为功能单体进行聚合反应。磁性分子印迹聚合物的形态学功能、吸附作用、识别性能等是通过紫外分光光度计、红外光谱分析仪及透射电子显微镜等进行检测的。同时,设计压电磁性表面分子印迹传感器,即将磁性表面分子印迹聚合物修饰在压电传感器的敏感元件上。用所制备的压电磁性表面分子印迹传感器对氯霉素进行检测。实验结果表明该传感器对氯霉素有很好的结合能力和高灵敏性。即氯霉素的检测限为6μg/L,检测时间为10 min。     

基于石墨烯分子印迹电化学传感器测定氯霉素

采用改进的Hummers法合成氧化石墨烯,通过共沉淀作用在氧化石墨烯表面生成磁性Fe3O4纳米微粒,经硅烷化修饰巯基,将金纳米颗粒自组装到复合材料中,得到磁性氧化石墨烯复合金纳米颗粒,将其滴涂在金电极表面,以氯霉素为模板分子,通过溶胶-凝胶法将分子印迹膜修饰到金电极上,制得氯霉素分子印迹电化学传感器,并对制备电化学传感器进行条件优化和电化学性能研究。结果显示,基于石墨烯分子印迹电化学传感器测定氯霉素的线性范围为2.5×10-9~5.0×10-6mol/L,检出限为8.0×10-10mol/L。     

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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