共查询到19条相似文献,搜索用时 375 毫秒
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以氧化石墨烯为载体,异丙隆为模板分子,采用表面印迹技术制备了分子印迹聚合物。采用透射电子显微镜、拉曼光谱和热重分析仪对该分子印迹聚合物的结构进行了表征,并通过动态平衡结合法研究了该分子印迹聚合物的吸附能力。结果表明:准二级动力学模型很好地拟合了吸附动力学,相关系数(R2)为0.999 7;与非分子印迹聚合物相比,制备的印迹材料表现出高吸附效率和快速的吸附动力学;选择性吸附试验表明该分子印迹聚合物对异丙隆具有选择性和特异性吸附。 相似文献
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《化学研究与应用》2017,(7)
以甲砜霉素(TAP)为模板分子,环氧氯丙烷(ECH)为亲水调节剂,采用溶胶-凝胶法,合成亲水性印迹聚合物(OC-MIP)。通过红外光谱法和静态吸附实验对其结构和吸附性能进行分析,并利用Scatchard分析、Langmuir和Freundilich吸附模型对其吸附机理进行探讨。结果表明OC-MIP存在两类性质不同结合位点,Freundilich模型可以很好拟合吸附等温线,在水相中对甲砜霉素有较大的吸附能力,良好的特异识别性。同时建立分子印迹固相萃取-超高效液相色谱方法测定水样中甲砜霉素,方法回收率为92.85%~97.57%,相对标准偏差(RSD)为1.96%~2.14%。 相似文献
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以罗丹明B为模板分子,以钛酸丁酯为交联剂,采用溶胶-凝胶法在酸性条件下制备了罗丹明B二氧化钛溶胶-凝胶分子印迹聚合物;利用傅立叶变换红外光谱和透射电镜分析了分子印迹聚合物的结构,使用热重分析测定了其热稳定性,采用静态吸附和动态吸附方法考察了其吸附性能,并与非印迹聚合物进行了对比.结果表明,与非印迹聚合物相比,印迹聚合物具有网络状多孔隙凝胶微结构及对模板分子的特异性识别结合位点,因而对模板分子具有更好的吸附性能和特异选择性.其原因可能在于,模板分子上的羰基与钛酸丁酯水解产生的羟基产生氢键作用,使钛酸围绕于模板分子周围,并通过缩聚形成凝胶;当模板分子洗脱后,孔隙得到保留并形成网络状凝胶,从而能够吸附更多的模板分子. 相似文献
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以卡维地洛药物分子为模板,甲基丙烯酸为功能单体,乙二醇二甲基丙烯酸酯为交联剂,采用紫外光引发聚合的分子印迹技术,成功制备出卡维地洛分子印迹聚合物。用热重分析、扫描电镜对聚合物进行了表征,通过Scatchard方程研究了印迹聚合物对模板分子的结合特性。结果表明,在所研究的浓度范围内,印迹聚合物存在一类等价的结合位点,并计算出印迹聚合物与模板分子的平衡离解常数为0.5642 mmol/L,最大表观吸附量为97.44μmol/g,为理论值的63.53%。对不同底物的结合实验表明,该聚合物对卡维地洛具有优良的吸附选择性。 相似文献
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酚酞分子印迹聚合物的制备及特异吸附性能 总被引:1,自引:0,他引:1
以泻药酚酞为模板分子,4-乙烯基吡啶为功能单体制备了模板分子和功能单体不同比例的一系列酚酞分子印迹聚合物。利用扫描电镜对聚合物进行了表面形态分析,采用静态平衡实验法研究了聚合物对模板分子及其类似物的吸附行为和选择性识别能力。实验结果表明,所制备的分子印迹聚合物,吸附 3 h 后基本接近最大吸附量,其中模板分子、4-乙烯基吡啶和交联剂的摩尔比为 1∶6∶20的MIP2的印迹因子为 2.30,效果最佳。Scatchard 分析表明, 在所研究的浓度范围内,吸附过程存在两类结合位点,一类高亲和力结合位点的离解常数为Kd1= 0.63 mmol/L,最大表观结合量 Qmax1 = 25.4 umol/g,另一类低亲和力结合位点的离解常数为 Kd2 =3.5 mmol/L,最大表观结合量 Qmax2 = 61.9 umol/g,通过与酚酞类似物质在酚酞分子印迹聚合物上的吸附行为比较,表明对酚酞具有很好的选择性吸附。 相似文献
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利凡诺分子模板聚合物的吸附与识别特性研究 总被引:25,自引:3,他引:22
以利凡诺药物为模板分子,α-甲基丙烯酸为功能基单体,乙二醇二甲基丙烯酸酯为交联剂,选用分子模板技术,合成了一种新的具有类似于酶或药物受体结合部位为结构特征的分子模板聚合物.研究了它对利凡诺和其它底物的吸附特性和选择性识别能力.结果表明,与组成相同的非模板聚合物相比,利凡诺分子模板聚合物有较大的吸附性能和高度的选择性及识别能力.静电作用和氢键在吸附和识别过程中发挥着重要作用. 相似文献
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Three kinds of molecularly imprinted polymers (MIPs) were obtained with surface molecular imprinting technique on functionalized potassium tetratitanate whisker (F-PTW). The results of adsorption experiments indicated that MIP prepared using PTW modified with N-(2-aminoethyl)-3-(trimethoxysilyl)propylamine (AAPTS) (F-PTW A) as support [MIP(1)] was superior to the other two polymers, then MIP(1) was selected to analyze the 4-nitrophenol (4-NP) adsorption process from aqueous solution in this study. AAPTS offered hydrophilic exterior that allowed to self-assemble with the template 4-NP through intermolecular interaction rather than based on the interactions between the functional monomers and template. Equilibrium adsorption data were analyzed by the Langmuir and Freundlich isotherm models at various temperatures. Kinetic properties were successfully investigated by pseudo-first-order model, pseudo-second-order model, intraparticle diffusion equation, initial adsorption rate, half-adsorption time. A diffusion-controlled process as the essential adsorption rate-controlling step was also proposed. The performance of such imprinted polymer was further demonstrated by high-performance liquid chromatography, and the results showed that the selectivity of MIP(1) exhibited higher affinity for template 4-NP over competitive phenolic compounds than that of non-imprinted polymer NIP(1). MIP(1) could be reused four times without significant loss in the adsorption capacity. 相似文献
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为了制备能有效分离富集药草中槲皮素的固相萃取柱,以丙烯酰胺(AM)修饰的碳纳米管为载体,三硫代碳酸酯(DBTTC)为可逆加成-断裂链转移剂(RAFT试剂),槲皮素为模板,甲基丙烯酸(MAA)为功能单体,乙二醇二甲基丙烯酸酯(EGDMA)为交联剂,乙腈为致孔剂,制备了槲皮素分子印迹聚合物,采用红外光谱、扫描电镜和热重分析对印迹材料进行表征,通过高效液相色谱(HPLC)研究聚合物的吸附性能和对底物的特异性识别能力。结果表明,通过活性自由基聚合法合成的多壁碳纳米管表面槲皮素分子印迹聚合具有更好的形态结构和吸附性能,且对槲皮素有很好的特异性识别能力。 相似文献
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Hiroshi Ugajin Norio Oka Toru Okamoto Haruma Kawaguchi 《Colloid and polymer science》2013,291(1):109-115
We developed a novel type of protein molecule-imprinted particles. Bovine hemoglobin (BHb) and submicron-sized polymer particles were used in this study as a template and a substrate, respectively. BHb molecules were softly and sparsely adsorbed on the particle surface. Then skin layer was formed with a thickness of BHb molecule size by living radical graft polymerization of moderately hydrophilic monomers. After that, BHb molecules were removed from their embedded spaces. The ability of vacant spaces on the surface layer of particles to take BHb molecules selectively was examined. Successful results were obtained not only in single protein adsorption system but also in the competitive adsorption system of several proteins and BHb, that is, the imprinted space was reserved for BHb even if other proteins coexisted, although their nonspecific adsorption on non-imprinted surface was not avoided. 相似文献
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The paper describes a rational approach for the selection of cross-linkers during the development of molecularly imprinted polymers (MIPs). As a model system for this research MIPs specific for the drug zidovudine (AZT) were designed and tested. Three cross-linkers trimethylolpropane trimethacrylate (TRIM), ethylene glycol dimethacrylate (EGDMA) and divinylbenzene (DVB) were studied. The analogue of zidovudine (AZT) ester (AZT-ES) was used as a dummy template. The imprinting factors for all of the polymers in the static adsorption experiments were calculated. The data on the AZT adsorption by control polymers (CP), which were prepared with different cross-linkers without a functional monomer, was also analyzed. DVB was found to be more inert towards zidovudine than EGDMA and TRIM, which was confirmed by both molecular modelling and adsorption experiments. It was demonstrated that DVB-based polymers had a higher imprinting factor (I = 1.85) compared with other tested cross-linked polymers. It was suggested that the selection of the cross-linker should be based on the strength of the interaction with the template: the cross-linker which displays lower binding of the template should be preferential because it generates MIPs with lower non-specific binding and a higher imprinting factor, and therefore specificity. Which cross-linker to use for the preparation of any particular MIP can be determined by analysis of the interactions between the cross-linker and template. This could be done either virtually using computational modelling or by template adsorption using a small library of polymers prepared using different cross-linkers. 相似文献
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以葡萄糖为碳源采用水热法制备出碳微球,再将其作为模板剂,柠檬酸作为络合剂,去离子水和乙醇作为溶剂,经混合搅拌、沉淀和去除模板剂等步骤,由La(NO3)3·6H2O和Mn(NO3)2制备LaMnO3。采用粉末X射线衍射、场发射扫描电镜、N2吸附-脱附等对LaMnO3进行表征分析,并对其电化学性能进行了测试。结果表明,碳微球模板可制备出层状多孔结构的LaMnO3,其具有良好的氧还原反应(ORR)和析氧反应(OER)催化活性,比表面积为26m2/g,将其制备成铝-空气电池空气电极催化剂,在电流密度20mA·cm-2时放电电压可达1.476V,高于共沉淀法制备的LaMnO3的放电电压。 相似文献