甲胺磷分子印迹聚合物的结合机理及其分子识别特性的光谱学研究

采用分子自组装印迹技术合成了一种新的对甲胺磷农药分子有高度选择性的分子印迹聚合物。在预聚合阶段,通过1H NMR,FTIR和UV光谱法研究了分子印迹聚合物的形成机理。结果表明模板分子和功能单体通过协同氢键作用形成1∶2型氢键配合物,配合物稳定常数K＝2.894×106 L2·mol-2,稳定性好。运用红外光谱法研究了印迹聚合物对模板分子的特异性识别作用,进一步表明印迹聚合物通过协同氢键作用特异性地识别模板分子。     

久效磷分子印迹聚合物分子识别特性的光谱研究

采用分子印迹技术合成了对有机磷农药久效磷有高度选择性的聚合物,通过1H NMR和紫外光谱研究了印迹聚合物的结合机理和识别特性。结果表明,该聚合物通过协同氢键作用形成1∶2型氢键配合物专一地结合久效磷。聚合物红外光谱研究表明,聚合物表面存在可与印迹分子相互作用的官能团。     

1-氨基萘印迹聚合物分子识别特性的光谱学研究

采用分子自组装印迹技术合成了一种对1-氨基萘有高度选择性的分子印迹聚合物新材料。应用紫外光谱、红外光谱、X射线光电子能谱和1H核磁共振波谱等研究了印迹聚合物的结合位点和识别机理。结果表明模板分子与功能单体通过氢键作用形成1:1型配合物,配合物的稳定常数K=5.537×104L/mol。1-氨基萘分子氨基上的氮原子是质子接受体,功能单体甲基丙烯酸分子羧基上的氢原子是氢键的质子给予体,是与1-氨基萘形成氢键作用的选择性识别位点。利用平衡吸附试验研究了印迹聚合物的结合特性,表明印迹聚合物对1-氨基萘分子具有特异的识别性能。     

分子印迹技术特异性识别头孢类分子的光谱研究

以头孢氨苄(CFL)为特异性分析识别对象,采用本体聚合和悬浮聚合两种聚合方法,制备了头孢氨苄分子印迹聚合物.紫外光谱研究证实模板分子CFL与内烯酰胺之间形成氢键型配合物.用红外光谱法分析了CFL分子印迹聚合物的聚合程度及聚合物表面上存在的功能基团.紫外光谱分析表明,用AM-EGD-MA体系和本体聚合法制备的印迹聚合物对...     

地西泮分子印迹聚合物的光谱学特性及其在传感测试中的应用

制备地西泮的分子印迹聚合物,应用紫外光谱(ultraviolet spectra,UV spectra)和红外光谱(infra-red spectra,IRspectra)分析该聚合物的识别特性及模板分子和功能单体的结合作用。在丝网印刷电极上原位制备地西泮的分子印迹膜,并在此基础上建立了检测地西泮的电导型传感方法。实验结果表明模板分子与功能单体可形成1:2型氢键配合物,印迹聚合物中存在可与模板分子通过协同氢键相互作用的官能团,该聚合物对地西泮有高度特异的识别力,电导型传感方法对地西泮的检测限达0.008mg.L-1,线性范围为0.039～0.62mg.L-1,可实现现场快速检测。     

奎尼丁分子印迹聚合物的制备及其吸附性能

以奎尼丁(Quinidine)为模板分子,合成奎尼丁分子印迹聚合物(MIP)。通过封管聚合法研究不同功能单体对奎尼丁分子印迹聚合物的影响,并运用Scatchard方程研究奎尼丁分子印迹聚合物选择吸附特性。以甲基丙烯酸(MAA)为功能单体合成的分子聚合物具有较高的选择吸附性,并且印迹聚合物大于非印迹聚合物的吸附量。奎尼丁印迹聚合物用于临床对奎尼丁的富集与检测有应用前景。     

乙酰甲胺磷分子印迹聚合物识别特性的光谱研究

用紫外及红外分光光度法研究了印迹分子和单体之间的作用力,结果表明随着甲胺磷浓度的增加,紫外吸收曲线的最大吸收波长发生红移,说明两者之间存在氢键作用力;经红外光谱分析进一步表明乙酰甲胺磷的—NH和PO可以和甲基丙烯酸的—COOH之间有氢键作用。采用悬浮聚合法制备乙酰甲胺磷分子印迹聚合物微球,除去印迹分子的聚合物留下了对印迹分子特异识别的结合位点。此聚合物可用来做吸附填料,分离富集环境样品中的乙酰甲胺磷。     

磺胺二甲嘧啶分子印迹聚合物制备与光谱特性

本研究以磺胺二甲嘧啶为模板分子,甲基丙烯酸为功能单体,低温紫外引发聚合制备分子印迹聚合物,用紫外光谱法对磺胺二甲嘧啶与甲基丙烯酸的结合作用及磺胺二甲嘧啶印迹聚合物的静态吸附性能和选择性能进行研究,试验结果表明,溶液中的功能单体与印迹分子之间产生了结合作用;与空白印迹聚合物相比,以甲基丙烯酸为功能单体、磺胺二甲嘧啶为模板的分子印迹聚合物展现了较高的结合容量,与其他结构类似的底物磺胺异唑相比,磺胺二甲嘧啶分子印迹聚合物对磺胺二甲嘧啶模板分子显示出明显的选择性和特异性,静态分配系数K_D可达282.3 mg·mL-1,分离因子α可达3.9,并预测磺胺二甲嘧啶分子印迹聚合物结合机理。分析了甲基丙烯酸、二甲基丙烯酸乙二醇酯和磺胺二甲嘧啶分子印迹聚合物的红外谱图,研究结果表明制备的磺胺二甲嘧啶印迹聚合物中CC双键峰很小,并且功能键羧酸键没有明显变化,经交联聚合得到的聚合物确实存在可以同印迹分子相互作用的化学基团。     

莱克多巴胺分子印迹聚合物的制备及其性能分析

采用热聚合法制备了莱克多巴胺(ractopamine,RCT)的分子印迹聚合物(molecular imprinted polymers,MIPs)。用紫外分光光度法测定MIPs对RCT的吸附性能,结果发现：RCT在272 nm波长处有最大吸光度,测定RCT的回归方程为y=7.354 1x+0.001 0,R2=0.999 9;合成的MIPs对RCT平均吸附率为83.4%。吸附动力学研究表明,MIPs对RCT的吸附时间应控制在10 min以内。红外光谱分析表明RCT与功能单体甲基丙烯酸通过氢键形成MIPs,该聚合物能够通过氢键专一地识别和结合RCT分子,从而为建立基于分子印迹技术检测RCT的方法奠定了基础。     

辛硫磷分子印迹聚合物的合成

以辛硫磷为模板分子,丙烯酰胺为功能单体,乙二醇二甲基丙烯酸酯为交联剂,偶氮二异丁腈为引发剂,在甲醇溶液中制备了辛硫磷分子印迹聚合物.该聚合物对模板分子具有良好的选择性,用作液相色谱固定相,很好地分离了模板分子及其结构类似物,结果令人满意.     

Phosphonate electrochemical recognition by molecularly imprinted deposited film

In this paper, thin films of titanium oxide imprinted with O,O-dimethyl-(2,4-dichlorophenoxyacetoxyl)(3′-nitrobenyl) methinephosphonate (Phi-NO₂) were prepared via liquid phase deposition (LPD) method on a glassy carbon electrode. The imprinted molecular in the films was removed by treatment with immersion in CH₂Cl₂. X-ray diffraction (XRD) and electrochemical methods were introduced to show the evidence of the molecular imprinting phenomenon. It was also found that the recognition ability of the sensor depended on the substituents associated with tridimensional structures of the nitro-compounds. Under the optimized condition, the sensor showed better sensitivity, selectivity and reproducibility to the imprinted molecule and the linear relationship between the current and the concentration of analyte in the range of 0.1-50 μM was obtained. LPD proved to be a powerful method for imprinting titanium oxide thin sense films.     

An analysis of absorption-desorption of volatile organic compounds by molecularly imprinted polymer films

A theoretical analysis of the experimental data on absorption (desorption) of volatile organic compounds by (from) molecularly imprinted polymer films was performed. The theoretical time dependences of the amount of absorbed analyte in a film were calculated using a system of equations with four kinetic parameters (Γ, K, K _sur , and C _eq ), which were determined by theoretically approximating the experimental data. The special features of the absorption-desorption process in a polymer film were suggested to be described using a parameter called the specificity coefficient. Specificity coefficients were determined for all the polymers and analytes studied. The specificity coefficients obtained from the chromatographing data were compared with the imprinting factors of chromatograms calculated from the experimental retention time values. An empirical linear dependence of specificity coefficients on imprinting factor values was obtained.     

Preparation and recognition of surface molecularly imprinted core-shell microbeads for protein in aqueous solutions

In this paper, a surface molecular imprinting technique was reported for preparing core-shell microbeads of protein imprinting, and bovine hemoglobin or bovine serum albumin were used as model proteins for studying the imprinted core-shell microbeads. 3-Aminophenylboronic acid (APBA) was polymerized onto the surface of polystyrene microbead in the presence of the protein templates to create protein-imprinted core-shell microbeads. The various samples were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and Brunauer-Emmett-Teller (BET) methods. The effect of pH on rebinding of the template hemoglobin, the specific binding and selective recognition were studied for the imprinted microbeads. The results show that the bovine hemoglobin-imprinted core-shell microbeads were successfully created. The shell was a sort of imprinted thin films with porous structure and larger surface areas. The imprinted microbeads have good selectivity for templates and high stability. Due to the recognition sites locating at or closing to the surface, these imprinted microbeads have good property of mass-transport. Unfortunately, the imprint technology was not successfully applied to imprinting bovine serum albumin (BSA).     

Distribution of molecularly imprinted polymer layers on macroporous silica gel particles by STEM and EDX

Using transmission electron microscopy (TEM) in parallel and scanning mode (STEM) combined with energy dispersive X-ray spectroscopy (EDX) the distribution of molecularly imprinted polymer layers covalently grafted on the inner and outer surface of macroporous silica gel particles was observed. The grafting was achieved using a special initiator system (iniferter) and applied on a well known model system producing molecularly imprinted layers with L-phenyl alanine analide (L-PA) as template. By staining the sample with RuO(4) before its embedment in epoxy resin and cutting ultra thin slices it was possible to identify the stained grafted polymer on the silica matrix by EDX. Based on this, complete particle slices could be investigated by visual means according to the presence or absence of grafted polymer and its layer homogeneity.     

Electrochemical sensing for the detection of 2,4-dichlorophenoxy acetic acid using molecularly imprinted polymer membrane

Molecularly imprinted polymer (MIP) membranes were used to develop highly sensitive chemical sensors for the detection of herbicide 2,4-dichlorophenoxy acetic acid (2,4-d). The 2,4-d imprinted composite MIP membranes were prepared, and the characterization was done by UV-VIS spectrophotometer, Fourier transform infrared spectroscopy, and scanning electron microscopy, and the same were fitted in a new electrochemical sensor model. Membrane electroconductivity measurements were performed by applying a small-amplitude alternating voltage (20 mV) with a varying frequency from 20 Hz to 80 kHz generated by a low-frequency wave form generator. The measured changes in the membrane ionic/electric conductivity as a function of 2,4-d concentration was allowed to evaluate the recognition properties of the prepared membrane. This sensor is useful in detecting 2,4-d herbicide having concentration range 10^-3 M to 10^-6 M. The cross-selectivity of the sensor, reproducibility of results, and reusability of MIP membrane were examined and found remarkable and recommendable.     

Fabrication of electrochemical sensor based on molecularly imprinted polymer and nanoparticles for determination trace amounts of morphine

Ionics - A simple and rapid electrochemical method developed for the detection of trace amounts of morphine (MO) at the surface of modified pencil graphite electrode (PGE) with multiwall carbon...     

Ultrasound assisted combined molecularly imprinted polymer for selective extraction of nicotinamide in human urine and milk samples: Spectrophotometric determination and optimization study

Ultrasound-assisted dispersive solid phase microextraction followed by UV–vis spectrophotometer (UA-DSPME-UV–vis) was designed for extraction and preconcentration of nicotinamide (vitamin B₃) by HKUST-1 metal organic framework (MOF) based molecularly imprinted polymer (MIP). This new material was characterized by FTIR and FE-SEM techniques. The preliminary Plackett–Burman design was used for screening and subsequently the central composite design justifies significant terms and possible construction of mathematical equation which give the individual and cooperative contribution of variables like HKUST-1-MOF-NA-MIP mass, sonication time, temperature, eluent volume, pH and vortex time. Accordingly the optimum condition was set as: 2.0 mg HKUST-1-MOF-NA-MIP, 200 μL eluent and 5.0 min sonication time in center points other variables were determined as the best conditions to reach the maximum recovery of the analyte. The UA-DSPME-UV–vis method performances like excellent linearity (LR), limits of detection (LOD), limits of quantification of 10–5000 μg L⁻¹ with R² of 0.99, LOD (1.96 ng mL⁻¹), LOQ (6.53 μg L⁻¹), respectively show successful and accurate applicability of the present method for monitoring analytes with within- and between-day precision of 0.96–3.38%. The average absolute recoveries of the nicotinamide extracted from the urine, milk and water samples were 95.85–101.27%.     

6—磺酰香豆素—β—CD的合成及分子识别性质初探

本文合成和鉴定了具有分子识别功能的发光试剂６－磺酰香豆素－ＣＤ（吣－Ｃｓ－β－ＣＤ）。在碱怀条件下，经过足够的光照，它有产生强而稳定的荧光，以其为腐朽 ，研究了对客体环己醇，环己烯，环己烷和溴代环己烷分子的认别性能，计算出相应的包结常数和识别因子。