共查询到18条相似文献,搜索用时 140 毫秒
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采用分子印迹技术,以氨基三唑(AMI)为模板分子,异丁醇为溶剂,甲基丙烯酸(MAA)为功能单体,乙二醇二甲基丙烯酯(EDMA)为交联剂,合成了氨基三唑分子印迹聚合物(AMI-MIP)。采用静态平衡结合实验和选择性实验评价了AMI-MIP对底物分子的结合特性及分子识别性能,并进行了吸附动力学研究。结果表明,AMI-MIP对AMI存在不同亲和力的两类结合位点,且对AMI具有很高的选择吸附特性和良好的分子识别性能,AMI-MIP对AMI的吸附行为可用准二级吸附动力学方程加以描述。 相似文献
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在硅胶表面接枝乙烯基三乙氧基硅烷得到接枝硅胶,将其与模板分子丹参素、功能单体4-乙烯基吡啶、交联剂乙二醇二甲基丙烯酸酯等,在偶氮二异丁腈引发作用下进行聚合反应,制备丹参素分子印迹聚合物。采用红外光谱、元素分析对分子印迹聚合物进行表征,静态平衡吸附法和Scatchard分析法研究印迹聚合物的吸附特征。结果表明:该印迹化合物存在两种结合位点,它们的离解常数分别为714.29 mg·L-1和467.74 mg·L-1,饱和吸附量分别为9.93 mg·g-1和61.80 mg·g-1,印迹因子分别达1.93和2.19,对丹参素具有较好的选择吸附性能,可用于丹参素的分离和富集。 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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以环丙沙星(CIP)为模板分子,α-甲基丙烯酸(MAA)为功能单体,三甲基丙烯酸三羟甲基丙烷酯(TRIM)为交联剂,进行热聚合.通过对于功能单体和交联剂的用量对分子印迹聚合物吸附性能的影响的研究,得到最佳的聚合配比为n(CIP):n(MMA):n(TRJM)=1:6:16,并以此配比制得了对环丙沙星具有特异选择性吸附的分子印迹聚合物.通过静态平衡结合法研究了模板聚合物的结合动力学以及该聚合物的结合能力和选择特性,通过Scatchard分析法研究了印迹聚合物对模板分子的结合特性.结果表明,该印迹聚合物具有良好的吸附能力和吸附选择性,静态吸附分配系数KD为41.64,分离因子α为1.62;该印迹聚合物中形成了2类不同的结合位点,经计算它们的离解常数分别为Kd1=5.249×10-5mol·L-1,Kd2=2.237×10-3mol·L-1. 相似文献
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采用表面分子印迹技术,以谷胱甘肽(GSH)为模板分子,N-乙烯基吡咯烷酮(NVP)和丙烯酰胺(AM)为功能单体,N,N’-亚甲基双丙烯酰胺(MBA)为交联剂,γ-(甲基丙烯酰氧)丙基三甲氧基硅烷(KH570)改性的Fe3O4纳米颗粒为磁性载体,制备了对GSH有特异识别性的磁性分子印迹聚合物(GSH-MMIPs). 利用X射线衍射仪(XRD)、透射电子显微镜(TEM)、红外光谱(FT-IR)和振动样品磁强计(VSM)对聚合物进行了表征,结果表明磁性载体表面成功地包覆了分子印迹聚合物薄层. 静态吸附平衡实验和Scatchard分析结果表明,GSH-MMIPs中存在两类不同的结合位点,平衡解离常数分别为8.786×10-4 mol/L和5.424×10-3 mol/L,最大吸附量分别为49.195 mg/g和155.003 mg/g. 与化学组成相同的磁性非印迹聚合物(GSH-MNIPs)相比,GSH-MMIPs对谷胱甘肽有较高的选择吸附性能. 相似文献
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Pengyan Liu Lei Liu Li Zhang Ning Jiang Zhanli Liu Yun Wang 《Frontiers of Chemistry in China》2008,3(4):378-383
A molecularly imprinted polymer (MIP), with special molecule recognition properties of ciprofloxacin (CIP), was prepared by
thermal polymerization in which ciprofloxacin acted as template molecule, α-methacrylic acid (MAA) acted as functional monomer and trimethylolpropane trimethylacrylate (TRIM) acted as crosslinker.
The optimized ratio was determined to be n(CIP): n (MMA):n(TRIM)51:6:16 by investigation of the effects of different concentrations of functional monomer and the crosslinker on the
MIP’s recognition properties. Equilibrium binding experiment was used to investigate the adsorption dynamics, the binding
ability to template molecule and the substrate selectivity. Scatchard analysis was used to study the MIP’s binding characteristic
to template molecule. The results indicated that MIP has higher adsorption ability and selectivity. The equilibrium distribution
coefficient K
D was 41.64 and the separation factor α was 1.62. Scatchard analysis showed that two different kinds of binding sites were produced in the polymer matrix and their
dissociation constants were calculated to be K
d1 = 5.249 × 10−5 mol·L−1, K
d2 = 2.237 × 10−3 mol·L−1.
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Translated from Chemistry, 2008, 71(2): 132–137 相似文献
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This work was focused on the influence of match degree of structure parameters i.e. molecular size, volume and polarity (denoted as Rd, Vd and Pd) between imprinted cavities in Qu-MIP and Xn on the adsorption selectivity. The results presented that the influence of Rd on the adsorption selectivity was the largest and the most regular, while the influence of Pd was the smallest and the most irregular. Besides, the influence degree of Vd was decreased in general with the increase of Rd. However, as Rd was in the threshold of [0.99, 1.02], Vd would rise to the major influence factor. Furthermore, utilizing data obtained from experiment, the influence authority of Rd, Vd and Pd on the adsorption selectivity was calculated theoretically through multiple linear regression and principal component analysis of IBM SPSS Statistics 20, and results showed the authority order was Rd, Vd and Pd at any circumstance despite the value was different, which was in accordance with the result we directly inducted from the experiment. 相似文献
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Sara E. Campbell Mary Collins Lei Xie Joseph J. BelBruno 《Surface and interface analysis : SIA》2009,41(4):347-356
The surface morphology of thin molecularly imprinted polymer films has been studied using atomic force microscopy (AFM). The films were produced by spin coating onto glass substrates and examined as a function of host polymer, imprinting template, casting solvent, spin‐coater rotation speed and post‐production treatment. It was observed that the gross features of such films are template controlled. The fine structure is determined by parameters such as solvent, spin speed or subsequent treatment. The relationship between these observations, polymer–template interactions and the mechanism of film formation in spin coating is discussed. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
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以S-布洛芬为模板分子、3-氨丙基三乙氧基硅烷为功能单体、正硅酸乙酯为交联剂,采用溶胶凝胶法成功制备了对S-布洛芬具有特异选择识别功能的磁性分子印迹聚合物,并且分别采用红外(IR)光谱、扫描电镜(SEM)、X射线粉末衍射(XRD)对其结构进行了表征.通过紫外(UV)光谱研究了其对S-布洛芬的吸附性能,并且建立了高效液相色谱(HPLC)手性流动相法研究其对布洛芬的拆分.结果表明,该磁性分子印迹聚合物具有良好的磁响应性,在外加磁场下可实现快速分离;S-布洛芬分子印迹复合膜对S-布洛芬具有较好的选择结合性,其结合量达到68.3mg/g;每100mg复合膜可使外消旋布洛芬的分离度增加2.1%. 相似文献