人血红蛋白分子印迹聚合物的制备及分子识别性能

以丙烯酰胺和甲基丙烯酸为功能单体制备得到了具有选择性识别能力的人血红蛋白分子印迹聚合物. 该印迹聚合物的分子识别特性来自聚合物的结合基团与印迹分子的功能基团之间的氢键和静电作用,以及印迹孔穴的空间几何选择性. 研究表明,聚合单体中甲基丙烯酸的含量会影响聚合物对血红蛋白的特异结合能力及分子印迹聚合物的吸附容量和洗脱性能.     

罗丹明B分子印迹聚合物的制备及分子识别性能研究

以三苯甲烷类碱性染料罗丹明B为模板分子,丙烯酰胺为功能分子,N,N-亚甲基双丙烯酰胺(MBA)为交联剂,采用表面修饰分子印迹法,制备对罗丹明B具有特定亲和选择性的分子印迹聚合物。应用红外光谱对印迹聚合物进行表征,通过静态吸附实验对聚合物的吸附动力学进行分析,采用平衡结合实验评价了分子印迹聚合物的吸附性能。结果表明,采用表面修饰分子印迹法所制备的印迹聚合物对罗丹明B表现出较好的特异吸附,对模板分子最大吸附量值为96μmol/g。     

3,5,7,3＇,4＇,5＇-六羟基黄酮分子印迹聚合物制备及性能表征

采用分子印迹技术合成了对3,5,7,3＇,4＇,5＇-六羟基黄酮具有高效选择性的分子印迹聚合物,通过静态吸附的方法,利用Scatchard模型,研究了分子印迹聚合物的特异性识别能力。实验表明,以甲基丙烯酸为功能单体,在甲苯溶剂中聚合得到的分子印迹聚合物对3,5,7,3＇,4＇,5＇-六羟基黄酮具有较大的吸附富集能力和识别特性。其饱和吸附容量达到30.8 mg/g。     

沉淀聚合法制备磺胺二甲嘧啶分子印迹聚合物

以磺胺二甲嘧啶为模板分子,采用沉淀聚合法制备了分子印迹聚合物,并对其选择性和吸附性能进行了研究.等温静态平衡实验结果表明,该印迹聚合物与相应的空白聚合物相比具有高的选择性和亲和性;Scatchard模型分析结果表明,该印迹聚合物对印迹分子存在一种均匀的结合位点,最大表观结合量为31.866 mg/g.     

水相中马尿酸分子印迹聚合物的制备及其性能研究

采用分子印迹技术,以马尿酸为模板分子,在水相中制备其印迹聚合物。用于液相色谱固定相,结果表明,该聚合物固定相表现出良好的分离选择性,能够使马尿酸与和其结构相似的苯甲酸及咖啡酸快速基线分离。并通过平衡吸附法分析了印迹聚合物的识别特性,结果表明分子印迹聚合物对马尿酸有特异性吸附。     

乙酰水杨酸分子印迹聚合物微球的制备及性能研究

以乙酰水杨酸为模板分子,采用沉淀聚合的方式制备了对乙酰水杨酸具有高选择性和亲和性的分子印迹聚合物微球。通过紫外光谱分析法考察了模板分子与功能单体作用规律,优选了功能单体与配合比例。等温吸附实验的结果显示,与相应的空白聚合物相比,印迹聚合物对模板分子具有更高的亲和性;Scatchard数学模型分析的结果表明,印迹聚合物中主要存在一类亲和性质相同的结合位点,其最大表观结合量为37.97 mg/g。选择性吸附实验表明,制备的印迹聚合物对模板分子具有良好的选择性识别能力。     

四溴双酚A分子印迹聚合物的制备及其吸附机制初探

采用分子印迹技术,以四溴双酚A为模板分子、2-乙烯吡啶为功能单体、乙二醇二甲基丙烯酸酯为交联剂。通过本体聚合法合成了对四溴双酚A具有高度选择性的印迹聚合物。平衡吸附实脸表明：与空白聚合物相比,四溴双酚A印迹聚合物具有较高的吸附能力和选择识别能力。同时比较了印迹聚合物对模板分子和结构相似物的识别能力。结果表明印迹聚合物对四溴双酚A具有更好的特异选择性和识别能力,为复杂介质中四溴双酚A的富集检测提供了一种快速准确有效的方法。     

邻苯二甲酸二丁酯分子印迹聚合物的制备及性能研究

以邻苯二甲酸二丁酯(DBP)为模板分子,甲基丙烯酸(MAA)为功能单体,乙二醇二甲基丙烯酸酯(EGD-MA)为交联剂,采用沉淀聚合法制备了分子印迹聚合物。通过静态平衡结合法和Scatchard分析法,研究了分子印迹聚合物的识别性能和结合能力。结果表明,该分子印迹聚合物对模板分子DBP具有较强的吸附特性和很好的选择性,其识别因子可达4.19。Scatchard分析表明,印迹聚合物微球存在2类不同的结合位点。高结合位点的平衡离解常数Kd1=0.078 mg/L,最大表观结合量Qmax1=53.03 mg/g;低结合位点的离解常数Kd2=0.023 mg/L,最大表观结合量Qmax2=33.95 mg/g。     

分子识别和分子印迹聚合物微球

分子识别在许多分离、催化以及生物化学过程中常常起着决定性作用。例如 ,分子结构上的微小差别往往可以决定某个生化反应 (如酶反应 )是否能够顺利进行 ,所以长期以来 ,科学家们一直努力寻找分子识别的途径。二十多年前 ,Ｗｕｌｆｆ等采用一种全新的被称作分子印迹(Ｍｏｌｅｃｕｌａｒｉｍｐｒｉｎｔｉｎｇ)的技术合成出了对糖类和氨基酸衍生物有识别作用的聚合物。此聚合物被称为分子印迹聚合物 (亦称分子模板聚合物 )。分子印迹技术就是指以特定的分子为模板 ,制备对该分子有特殊识别功能和高选择性材料的技术。该技术在最近几年内发展极…     

加替沙星分子印迹聚合物的合成及应用研究

以加替沙星为模板分子,采用沉淀聚合的方法制备了分子印迹聚合物(MIPs),对制备条件进行选择,利用静态吸附实验研究了聚合物对目标分子及其结构类似物的识别特性。聚合物对加替沙星的最大吸附量为28.87 mg/g,对加替沙星具有良好的吸附性能。以该印迹聚合物微球为固相萃取材料填充固相萃取柱,结合高效液相色谱法测定加替沙星回收率达到92%~99%,富集倍数为213。与C18柱相比,制备的聚合物具有更好的选择性与富集倍数,可用于环境中加替沙星的富集与分离。     

红霉素分子印迹聚合物纳米微球的制备及其吸附特性

以红霉素为模板分子、甲基丙烯酸为功能单体、乙二醇二甲基丙烯酸酯为交联剂,采用沉淀聚合法制备了粒径均一的红霉素纳米分子印迹聚合物微球,优化了分子印迹聚合物的合成条件,确定了模板分子与功能单体的最佳摩尔比为1:3,对其进行了表征. 结果表明,所制聚合物对红霉素的实际最大吸附量可达202.12 mg/g,吸附约200 min达到平衡,对红霉素具有良好的选择性吸附能力.     

溶胶-凝胶法制备鞣花酸表面分子印迹聚合物

采用溶胶-凝胶方法和表面分子印迹技术，以二氧化硅为载体，鞣花酸为模板分子，3-氨丙基三乙氧基硅烷为功能单体，四乙氧基硅烷为交联剂，在室温下合成鞣花酸分子印迹聚合物(MIPs)。通过扫描电镜表征了MIP的表面形貌。通过静态吸附实验评价了MIP对鞣花酸的吸附行为。结果显示，MIP对鞣花酸可在40 min内达到吸附平衡，印迹因子为2.68，饱和吸附容量可达70 mg/g；与非印迹聚合物相比，MIP对鞣花酸具有高选择性和特异识别性。对吸附数据进行非线性拟合结果显示，MIP对鞣花酸的吸附动力学较好地符合准二级动力学模型，MIP对鞣花酸的吸附等温线较好地符合Langmuir等温方程。另外，该材料在经过5次循环利用之后，对鞣花酸的吸附容量仍能保持在90%以上，表现了较好的重复利用性能。所合成的MIP能够作为一种良好的选择性吸附鞣花酸的功能材料，有望应用于复杂基质中鞣花酸的分离和纯化。     

分子印迹聚合物结合点的选择性修饰

以槲皮素为模板分子,甲基丙烯酸为功能单体,乙二醇二甲基丙烯酸酯为交联剂,制备了分子印迹聚合物(MIP),并以重氮甲烷为修饰剂,对MIP的结合点进行了选择性修饰,探讨了模板分子浓度、溶剂及重氮甲烷用量等对修饰效果的影响。结果表明,选择性修饰能明显提高MIP的识别能力与吸附速度,以柚皮素为竞争分子,分离因子可从修饰前的1.60提高到修饰后的3.06,吸附平衡时间从修饰前的100 min降低至修饰后的60 min;在一定范围内提高模板分子浓度,增大重氮甲烷用量,采用形成氢键能力较弱的溶剂,均能提高修饰效果。测定了修饰前后MIP中不同结合点吸附过程的焓变、熵变和自由能变化,从热力学角度对修饰效果和修饰机理作了进一步的分析。     

舒必利分子印迹聚合物的制备及其吸附性能

以舒必利(SUL)为模板分子,甲基丙烯酸(MAA)为功能单体,乙二醇二甲基丙烯酸酯为交联剂,采用本体聚合法合成了舒必利的分子印迹聚合物(MIP),采用静态平衡和等温吸附实验研究了影响MIP性能的各种因素及吸附机理. 结果表明,当SUL为0.3 mmol时,制备其MIP的优化条件为：乙腈溶剂用量6 mL, SUL与MAA的摩尔比为1:4,以甲醇-乙酸(9:1, j)溶液为洗脱剂洗脱;该聚合物结构均匀、疏松,对SUL具有较好吸附性能,最大吸附容量为79.12 mmol/g,印迹因子为3.76;初步认为其吸附机理是SUL分子结构中的N-甲基吡咯烷、酰胺和苯磺酰胺基团上的氨基与MAA自组装形成的吸附识别位点空穴;该MIP能识别SUL及其结构类似物阿米舒必利和泰必利,特异性吸附率分别为68.35%, 66.72%和58.8%.     

Side chain functionality dominated the chromatography of N‐protected amino acid on molecularly imprinted polymer

Molecularly imprinted polymer (MIP) with N^α‐protected amino acid as the print molecule was prepared and used as the stationary phase for the chromatographic study of molecular recognition. Particles of MIP were prepared by photopolymerization of 4‐vinylpyridine in the presence of tert‐butyloxycarbonyl‐L ‐tyrosine (Boc‐L ‐Tyr) and packed into a column for the chromatographic resolution of Boc‐L ‐Tyr and tert‐butyloxycarbonyl‐L ‐phenylalanine (Boc‐L ‐Phe). These two N^α‐protected amino acids that differ from each other in the side chain with one hydroxyl group on the benzene ring could be well separated on the MIP. A separation factor of about two was achieved by using a mixture of acetonitrile (99.5 v/v %) and acetic acid (0.5 v/v %) as the mobile phase. Results suggest that the interaction between hydroxyl group in the side chain of amino acid and pyridine in the polymer dominated the selective adsorption of print molecule on the MIP. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007     

Synthesis of a perfluorooctanoic acid molecularly imprinted polymer for the selective removal of perfluorooctanoic acid in an aqueous environment

Perfluorooctanoic acid (PFOA) contamination in the environment is a global problem. The aqueous phase is the main medium for PFOA because of its moderate solubility. Adsorption is a feasible way to remove PFOA because of its chemical and biological stability. In this study, a new type of molecularly imprinted polymer (MIP) for the selective adsorption of PFOA in aqueous solutions was synthesized by the precipitation polymerization method with PFOA as the template molecule after optimization. The adsorption kinetics and isotherms of the MIP adsorbent toward PFOA were studied, and the effects of the pH and cations on the adsorption were investigated with batch experiments. The results show that acrylamide (AAM) was the best functional monomer, and the optimal molar ratio of PFOA to AAM to ethylene glycol dimethacrylate (crosslinker) was 1:6:25. The optimized MIP adsorbent had a high affinity for PFOA, and the uptake percentage by the MIP adsorbent was 1.3–2.5 times that of the nonimprinted polymer (NIP) when PFOA existed alone. A maximum PFOA sorption capacity of 5.45 mg/g based on the Langmuir isotherm model was achieved with the MIP adsorbent. The MIP adsorbent exhibited a high selectivity for PFOA over competitive compounds (other perfluorinated alkyl carboxylic and sulfonic acids), whereas the NIP did not. Approximately 90% of the PFOA in the mixture was removed by the MIP adsorbent; this was 18 times that of the NIP. Moreover, the regenerability of the MIP adsorbent was confirmed in five sequential adsorption–desorption cycles without a significant reduction in the PFOA uptake. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 43192.     

硅胶表面罗丹明B分子印迹聚合物的制备及其性能研究

以表面接枝乙烯基的硅胶为载体,罗丹明B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,制备了表面印迹聚合物微球。通过静态吸附对吸附性能进行分析。结果表明,该印迹聚合物对模板分子具有特异吸附性能,并将其应用于固相萃取,测得罗丹明B的加标回收率为94.4%~101.2%,相对标准偏差(n=3)的范围为2.4%~3.4%。     

三硝基甲苯分子印迹微球的制备与应用

以三硝基甲苯（TNT）为模板分子,丙烯酰胺（AM）为功能单体,采用沉淀聚合法制备分子印迹聚合物MIP。通过紫外光谱法研究TNT和AM之间的相互作用,结果表明TNT与AM之间作用力较强,有助于形成结构稳定、亲和性强的聚合物;利用扫描电镜观测不同制备条件下印迹聚合物的表观形貌,发现乙腈用量为100mL,缓慢的搅拌速率下制备的聚合物形貌较优异;利用红外光谱分析聚合物的结构特征,验证印迹聚合物的制备与模板分子的洗脱;平衡吸附实验表明,MIP对TNT的吸附存在两种作用位点并且吸附量随TNT初始浓度增加而增加;动力学吸附实验发现印迹聚合物对TNT的吸附速率远大于非印迹聚合物;选择性吸附实验中,MIP对TNT表现出较好的特异吸附性能,而对于TNT的结构类似物DNT、RDX吸附能力较差。     

Selective adsorption and degradation of rhodamine B with modified titanium dioxide photocatalyst

A new highly selective photocatalyst (RhB‐MIP/TiO₂) was successfully prepared by surface molecular imprinting technique using rhodamine B (RhB) as template molecule. The adsorption kinetics show RhB‐MIP/TiO₂ possessed fast adsorption rate, and adsorption behavior followed the pseudo‐second‐order kinetics. The static binding experiments revealed RhB‐MIP/TiO₂ displayed strong affinity and high adsorption capacity for RhB. Moreover, the equilibrium adsorption rate of RhB‐MIP/TiO₂ for RhB can be well fitted by the Langmuir isotherm model. The thermodynamics parameters indicated that the binding system of RhB‐MIP/TiO₂ was endothermic and spontaneous. Compared with non‐imprinted photocatalyst (NIP/TiO₂), RhB‐MIP/TiO₂ exhibited excellent selectivity toward RhB, whose selectivity coefficient for RhB relative to rhodamine 6G (Rh6G) was 2.99. Selective photocatalytic degradation experiments indicated that the apparent rate constant for the photodegradation of RhB over RhB‐MIP/TiO₂ is 0.0212 min^?1, being 216% of that over NIP/TiO₂ (0.0098 min^?1). Therefore, RhB‐MIP/TiO₂ exhibited higher photocatalytic selectivity toward RhB. The prepared photocatalyst RhB‐MIP/TiO₂ has a promising perspective in industrial wastewater treatment. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40890.     

Molecularly imprinted polymer microspheres prepared via the two-step swelling polymerization for the separation of lincomycin

A molecularly imprinted polymer (MIP) was synthesized via a two-step swelling polymerization method for the purification of lincomycin. Polystyrene microspheres were prepared by the dispersion-polymerization process and used as the substrate. Methacrylic acid was used as the functional monomer, whereas ethylene glycol dimethacrylate was the cross-linker. The MIP was structurally characterized and examined for its separation performance at different conditions (temperature, solvents, etc.). It was found that the MIP possesses the good sphericity, porosity, monodispersity, and a high adsorption capacity of (180 μmol/g) in chloroform solution. Comparison studies showed that the MIP presents a higher capacity than the NIP (non-imprinted polymer) in chloroform solution and a much higher capacity in the practical lincomycin fermentation solution extracts, confirming the underlining mechanisms of the MIP. Scatchard plot revealed two adsorption mechanisms on the MIP, whereas the isotherm is better described by Freundlich equation. The adsorption/elution kinetics demonstrated that the MIP possesses good elution/regeneration capabilities with the elution ratio > 93%. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47938.