木犀草素分子印迹聚合物的合成

以木犀草素为模板分子,偶氮二异丁腈为引发剂,丙烯酰胺为功能单体,N,N-亚甲基双丙烯酰胺为交联剂,在极性溶剂中合成了木犀草素分子印迹聚合物(LMIP)。考察了溶剂用量及种类和功能单体对合成的影响,得到了最佳合成工艺条件,简化了模板分子的洗脱工艺。红外光谱分析表明:洗脱前分子印迹聚合物中原木犀草素在1 270 cm-1处的O—H吸收峰移至1 300 cm-1处,说明模板分子被功能单体、交联剂经聚合交联固定在聚合物中,洗脱后该峰完全消失;扫描电子显微镜观察发现:洗脱后的分子印迹聚合物表面凹凸不平,产生了大量吸附模板分子的空穴。探讨了LMIP的吸附特性,用与木犀草素结构相似的槲皮素作对比实验,分子印迹聚合物对木犀草素的吸附量(33.653μmol/g)明显高于槲皮素的吸附量(8.654μmol/g),表明LMIP对模板分子具有较高的吸附选择性。     

木犀草素温敏分子印迹聚合物的合成及性能研究

以木犀草素为模板分子、丙烯酰胺为功能单体、N,N-亚甲基双丙烯酰胺为交联剂、N-异丙基丙烯酰胺为温敏单体,采用沉淀聚合法制备木犀草素温敏分子印迹聚合物。扫描电镜观察聚合物形貌,表明印迹空穴的存在。不同温度下吸附及洗脱实验证明所得印迹材料具备较好的特异性吸附性能及温度响应行为,可为天然药物中黄酮类木犀草素成分的提取分离提供新思路与新方法。     

木犀草素-Zn(II)配位印迹聚合物的制备及在箬叶黄酮碳苷分离中的应用

以箬叶黄酮碳苷母核木犀草素为虚拟模板分子,结合Zn(II)的配位作用,以丙烯酰胺为功能单体,N,N?-亚甲基双丙烯酰酯胺为交联剂,以乙醇为溶剂制备木犀草素-Zn(II)配位印迹聚合物,将此聚合物与固相萃取相结合,分离醇水体系中的箬叶黄酮碳苷。结果表明 ,当n（模板分子）﹕n（功能单体）﹕n（交联剂）=1:5:30时,配位印迹聚合物具有最好的吸附性能,对醇相中木犀草素的吸附容量可达103.4mg?g-1,是未配位印迹聚合物吸附容量的1.71倍,空白印迹聚合物的13.75倍。采用木犀草素-Zn(II)配位印迹聚合物分离醇水相中箬叶黄酮碳苷,经1次分离后,荭草苷、异荭草、牡荆苷和异牡荆苷的回收率分别为91.95%、80.87%、60.43%和63.63%,含量相比粗提物分别提高55.46、48.78、36.45和38.38倍,4种黄酮碳苷总含量由提取前的0.70%提高32.68%。     

木犀草素分子印迹聚合物的分子识别特性及固相萃取研究

采用分子印迹技术,以木犀草素为模板分子,丙烯酰胺为功能单体,乙二醇二甲基丙烯酸酯为交联剂,通过热引发聚合,制备了木犀草素分子印迹聚合物,并通过装入固相萃取柱研究了聚合物对木犀草素的选择性能.结果表明,该分子印迹聚合物对模板分子具有高度选择性和识别能力,而空白聚合物却不具备这样的特性.将木犀草素分子印迹聚合物用于固相萃取花生壳提取物,分离富集其中的木犀草素活性成分,在萃取柱上载样品之后,先用V(乙醇):V(水)=1:1溶液进行清洗,再用V(乙醇):V(水)=7:5溶液进行目标分子的洗脱,木犀草素的纯度可由1.6%提高到94.1%,回收率90.0%.木犀草索分子印迹固相萃取柱具有较好的稳定性和耐用性能,使用4次后其选择识别性能仍未降低,显示该聚合物具有直接作为复杂天然产物中木犀草素分离提取材料的潜能.     

分子印迹固相萃取法提取花生壳中木犀草素

采用分子印迹技术,以木犀草素为模板分子、丙烯酰胺为功能单体、EGDMA为交联剂,合成了木犀草素印迹聚合物。将该印迹聚合物用于固相萃取,分离提取花生壳中的木犀草素。结果表明,该印迹聚合物对木犀草素具有较高的吸附性能和选择性,用印迹柱萃取得到的木犀草素纯度高出硅胶柱分离近20个百分点,达到96.2%。且MIPs-SPE柱与普通的硅胶柱相比,经过洗脱再生后可以反复使用多次。     

糠醛分子印迹聚合物的制备及吸附性能研究

以糠醛为模板分子,采用本体聚合法制备了对糠醛具有高特异吸附性的糠醛分子印迹聚合物。利用扫描电镜和红外光谱对聚合物进行表征分析,并利用动态吸附、静态吸附和选择性吸附实验考察糠醛印迹聚合物的吸附性能。结果表明,所制备的糠醛分子印迹聚合物对糠醛呈现出较好的特异性吸附能力,有望作为固相萃取材料应用于食品中糠醛残留的分离、富集和检测。     

糠醛分子印迹聚合物的制备及吸附性能研究

以糠醛为模板分子,采用本体聚合法制备了对糠醛具有高特异吸附性的糠醛分子印迹聚合物。利用扫描电镜和红外光谱对聚合物进行表征分析,并利用动态吸附、静态吸附和选择性吸附实验考察糠醛印迹聚合物的吸附性能。结果表明,所制备的糠醛分子印迹聚合物对糠醛呈现出较好的特异性吸附能力,有望作为固相萃取材料应用于食品中糠醛残留的分离、富集和检测。     

白杨素分子印迹聚合物的制备及其性能评价

以白杨素为模板分子,硅胶为载体,丙烯酰胺为功能单体,采用表面印迹法制备白杨素分子印迹聚合物。并通过红外光谱测定,吸附实验等对印迹聚合物进行表征及性能评价。静态吸附实验表明,印迹聚合物对模板分子的吸附量远远高于非印迹聚合物;印迹聚合物及非印迹聚合物对白杨素、氯霉素、甲砜霉素的选择吸附表明,所制备的分子印迹聚合物对白杨素有特异性吸附效果。     

脱氢枞胺分子印迹聚合物的吸附性能研究

以脱氢枞胺为模板分子,丙烯酸为功能单体,马来松香乙二醇丙烯酸酯为交联剂,合成了脱氢枞胺分子印迹聚合物,对聚合物的结构和性能进行了表征,对分离提纯脱氢枞胺的性能进行了测定。结果表明,聚合反应的最佳条件为:0.285 g脱氢枞胺(1 mmol)、0.288 g丙烯酸(4 mmol)和4.91 g马来松香乙二醇丙烯酸酯(8 mmol);反应溶剂为氯仿(30 mL),汽油(15 mL),水(300 mL)混合溶剂;引发剂为偶氮二异丁腈(0.27 g);反应时间5 h,反应温度为70~80℃,搅拌速度为300 r/m in。最佳静态吸附条件为:以体积分数为80%的乙醇为溶剂配制脱氢枞胺溶液,质量浓度为2 g/L,分子印迹聚合物为20~40目,吸附温度70℃,振荡速度150 r/m in。脱氢枞胺分子印迹聚合物对脱氢枞胺的静态平衡吸附时间为12 h,吸附量为223 mg/g,平衡解吸时间为12 h,解吸率为95.9%。经分子印迹聚合物分离纯化后的脱氢枞胺质量分数由67.4%提高到98.3%。说明该分子印迹聚合物对脱氢枞胺的特异吸附性能良好,可以达到分离纯化脱氢枞胺的目的。     

克伦特罗分子印迹聚合物吸附性能研究

选用分子印迹技术,以克伦特罗为印迹分子,α-甲基丙烯酸为功能单体,乙二醇二甲基丙烯酸酯为交联剂,合成克伦特罗分子印迹聚合物,研究其吸附性能。结果表明,与组成相同的非印迹聚合物相比,克伦特罗印迹聚合物有较大的吸附性能,有望在克伦特罗分离分析中作为固相萃取的材料。     

Preparation and Characterization of Imprinted Porous Materials with High Selectivity for Luteolin

In order to selectively separate luteolin from its crude solution, we synthesized imprinted porous materials with high recognition specificity for luteolin, using an imprinting technique. Modified luteolin was used as template, vinyltriethoxysilane as the functional monomer, and tetraethyl orthosilicate (TEOS) as the cross‐linking agent. The results showed the following optimum reaction conditions: The reaction ratio between luteolin and acryloyl chloride was 1 : 2 (0.10 g/0.20 g), adding 1.0 g precursor; the feasible elution time was 12 h; when the molar quantity of modified template molecule was 0.01 mol and ethenyltriethyloxy‐silane (VTEO) was 0.04 mol, the maximum yield reached 91.6 %. All samples were tested by Brunauer‐Emmett‐Teller method, Fourier transform infrared (FTIR) spectroscopy, transmission electron microscopy, equilibrium adsorption experiments and selective adsorption experiments. It was found that the imprinted porous materials showed excellent selectivity for luteolin in aqueous solution. Characterization by FTIR suggested that an addition reaction had occurred between the modified template molecule and VTEO while forming ester bonds in the functional precursor. Results from pore structure analysis indicated that the imprinted porous materials had good channels, and the average pore size of the prepared porous materials was between 35.85 and 95.82 Å. Adsorption dynamics analysis suggested that, when the adsorption time reached 3 h, the adsorption process had reached balance and the adsorption capacity was at steady state. These porous materials had highly selective recognition properties and high equilibrium adsorption capacity for the template molecule. The equilibrium adsorption capacity of the imprinted porous materials to the template molecule was 11.4 times that of the blank porous materials.     

分子印迹聚合物的制备与应用研究进展

分子印迹技术也称之为分子膜技术,在分子识别和痕量分析中得到广泛的应用。利用分子印迹技术合成了分子印迹聚合物。近几十年来,该化合物受到了普遍的关注。分子印迹聚合物具有新型官能团,对某些分子具有空间识别性能。介绍了分子印迹聚合物的合成方法及机理,并论述了其在一些领域的应用进展。由于具有对某些分子的空间识别性能,在传感器中得到了应用;由于具有抵抗恶劣环境的能力,使其在酶催化方面得到应用;同样由于能够与具有类似结构的分子印迹聚合物相连接的能力,使其在膜分离及固相萃取中得到应用,在化学催化方面同样得到了应用。     

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.     

分子印迹聚合物制备与应用

分子印迹作为制备对某一特定的分子 (印迹分子或模板分子 )具有特异性识别的聚合物的过程 ,在分离分析、仿生传感器和模拟酶催化等方面具有重要的应用前景。介绍了分子印迹技术的基本原理、分子印迹聚合物的制备和特性、分子印迹技术的应用场合及发展趋势     

分子印迹聚合物微球的制备及应用进展

评述了分子印迹原理、分子印迹聚合物微球的制备技术以及一些制备新方法，并对其应用领域作了较为详细地介绍。     

Preparation of Glutathione Molecularly Imprinted Polymer Microspheres by Reversed Phase Suspension Polymerization

Molecularly imprinted polymer microspheres (MIPMs) for Glutathione had been prepared by the reversed phase suspension polymerization method; MIPMs were synthesized by using acrylamide and N-vinyl pyrrolidone as functional monomers. N,N’-methylenebisacrylamide and dimethyl diallyl ammonium chloride were the cross-linkers and H₂O₂ and Vc were redox initiators, Span-80 was the surfactant used and cyclohexane was the oil phase. Our work can provide a method to obtain ball MIPMs, and in this way, the destruction of acting sites because powdery MIPMs could be avoided. Moreover, the low concentration of cross-linker results in imprinted sites not being formed during the reversed phase suspension polymerization. The double cross-linkers not only solved this problem, but they also enlarged the selection range of the template, monomer and cross-linker. Simultaneously, there’s obviously a significant amount of synergy between the two cross-linkers that perhaps improve the adsorption capacity and selectivity. The conditions were investigated and optimized, and the optimum conditions were obtained as follows: the ratio of n_AM/n_NVP was 2; the optimum temperature and time were 50°C and 4.5 h; and, the dosage of GSH, DMDAAC and Vc were 0.8 g, 14 g and 0.023 g, respectively, under the optimum conditions, GSH-MIPM was prepared and showed the adsorption capacity was 75 mg · g^?1. Also, based on the samples prepared at the starting process and under optimal conditions, the adsorption kinetics and adsorption isotherm were investigated and analyzed, respectively.     

Selective Adsorption and Recognition by Molecularly Imprinted Polymer: A Study on Molecular Self-Assembly and its Effect on Selectivity

This article presents an interesting study on the molecular self-assembly and its effect on selective recognition by molecularly imprinted polymers. With theophylline as template and methylacrylic acid as functional monomer, the self-assembly appears to play important roles in the selective adsorption, affecting not only the adsorption amount but also the cognitive selectivity. Both of them become evident by the change of monomer-template ratio. An increase in the monomer-template ratio will result in a higher level of adsorption. The best selectivity for molecular recognition is, however, shown at the optimal constitute (corresponding to the saturation interaction of monomer and template). A higher or lower monomer-template ratio leads to a dramatic decrease in this selectivity. Related information indicates that this may be a result from the matched arrangement between binding sites and template, which makes the binding sites capable of selectively recognizing the imprint species. Preliminarily, this study presents an insight into the understanding of molecular recognition by imprinted polymers.     

Rationally Designing Molecularly Imprinted Polymers Toward a Highly Specific Recognition by Using a Stoichiometric Molecular Self-assembly

This article presents work on designing a highly specific imprinted polymer for molecular recognition. Based on a stoichiometric molecular self-assembly, the imprinted material was prepared using adenine as the template and methacrylic acid as the functional monomer. The result indicates that the stoichiometric molecular self-assembly plays a positive role in increasing the specificity of prepared materials, so as to adsorb more for the template but less for its analogue. Furthermore, the results indicate that higher or lower extents of self-assembly cause a dramatic decrease in the specificity. Related information indicates that these changes can be an increase in the match of template and the binding framework, which thereby makes the polymer capable of specifically recognizing the imprint species.     

胸腺五肽分子印迹聚合物磁性微球的制备及吸附性能研究

以胸腺五肽(Tp-5)为模板分子、丙烯酰胺(AM)为功能单体、乙二醇二甲基丙烯酸酯(EGDMA)为交联剂、羧基功能化Fe3O4磁性粒子为载体,采用乳液聚合法制备出胸腺五肽分子印迹聚合物磁性微球(Tp-5-MIPMMs)。通过研究交联剂用量、预聚合时间、聚合反应时间对Tp-5-MIPMMs吸附性能和印迹因子的影响,确定了最佳制备条件。扫描电镜(SEM)分析显示微球表面被多孔、均匀聚合物包覆,粒径40μm左右。静态和动态吸附研究表明Tp-5-MIPMMs在2.0 g·L-1的Tp-5溶液中吸附8 h达到饱和,最大吸附量达15.63 mg·g-1,印迹因子达1.51。以谷胱甘肽(GSH)作对比,用薄层色谱(TLC)研究了Tp-5-MIPMMs的选择吸附性能,结果表明Tp-5-MIPMMs对Tp-5分子具有特异选择能力。