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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 总被引:1,自引:0,他引:1
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. 相似文献
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分子印迹技术是制备具有分子特异识别功能聚合物的一种技术。分子印迹固相萃取技术由于具有高通量和高特异性,在食品、环境、药物、生物样品中分析物的分离、净化、富集中具有广阔的应用前景。文章中综述了分子印迹固相萃取技术的应用、分子印迹技术的最新进展和在应用中存在的问题等。 相似文献
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分子识别和分子印迹聚合物微球 总被引:1,自引:0,他引:1
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… 相似文献
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采用本体聚合法制备三聚氰胺(MEL)与双氰胺(DCD)双模板分子印迹聚合物(MEL/DCD-MIPs),将其作为固相萃取介质,实现了奶粉中MEL与DCD富集与纯化,建立了奶粉中两种物质同时检测的方法。通过热力学、选择性和动态结合试验表明,与单模板分子印迹聚合物相比,双模板分子印迹聚合物由于双模板-功能单体分子间的多位点协同作用而有更好的印迹效应,对MEL和DCD结合能力高于结构类似物三聚氰酸(CYA)。固相萃取试验显示,MEL/DCD-MIPs可以从市售奶粉中选择性地分离、富集MEL与DCD,对MEL与DCD的加样回收率分别为93.1%~100.1%和75.7%~82.5%,RSD均小于5.2%。所制得的MEL/DCD-MIPs可应用于奶粉等食品中氰胺类物质的检测。 相似文献
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Zikant Saenkasa Chaiyavat Chaiyasut Roongnapa Srichana Sirivipa Piyamongkol 《应用聚合物科学杂志》2007,103(4):2325-2330
The target of this study was to synthesize the molecularly imprinted polymers (MIPs) of L ‐phenylalanine as the solid phases for characterization of molecular adsorption by molecularly imprinted solid phase extraction (MISPE). These MIPs, in microscale, were synthesized using thermal (40°C)‐compared with thermal (65°C)‐initiated polymerization process. Itaconic acid was chosen as the functional monomers, and either ethylene glycol dimethacrylate or trimethylolpropane trimethacrylate (TRIM) was used as the cross linker and was compared together. The influences of several parameters on the properties of the MIPs were investigated, especially physical robustness from the percentage yields and molecular adsorption from the percentage recovery by MISPE. The best yields were obtained from polymers made using TRIM and thermal (65°C)‐initiated polymerization. However, there were no significant differences in molecular adsorption. It was concluded that these parameters can be considered to synthesize MIPs for chiral separation in advance steps such as other related chromatographic techniques. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 2325–2330, 2007 相似文献
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分子印迹聚合物制备与应用 总被引:11,自引:0,他引:11
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 相似文献
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利福平分子印迹聚合物的制备及其吸附行为 总被引:2,自引:1,他引:2
以利福平为模板分子、甲基丙烯酸为功能单体、乙二醇二甲基丙烯酸酯为交联剂,制备了利福平分子印迹聚合物. 采用平衡结合方法和Scatchard模型评价了该聚合物的结合特性,考察了其吸附行为. 结果表明,利福平分子印迹聚合物中形成了两类不同的结合位点,得到高亲和力结合位点的离解常数和最大表观结合量分别为31.5 mg/mL和23.34 mg/g,低亲和力结合位点的离解常数和最大表观结合量分别为9.22 mg/mL和12.86 mg/g. 实验结果显示,利福平分子印迹聚合物对利福平呈现出了高的选择吸附特性. 相似文献
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《分离科学与技术》2012,47(3):404-412
In this paper the development and evaluation of a molecularly imprinted polymer (MIP) for ethopabate is described. Ethopabate (ETP), 4-acetamido-2-ethoxybenzoic acid methyl ester, is one of the antibiotics which is used as coccidiostat in poultry feeds. In the present study, two widely used functional monomers, methacrylic acid (MAA) and 4-vinylpyridine (4-VP) were compared theoretically and experimentally as the candidates for MIP preparation. Hyperchem software was employed to estimate binding energies between ETP and functional monomers and batch rebinding experiments were performed to study the binding characteristics of the polymers. The results showed that MAA is a better functional monomer to prepare MIP. UV/Vis and NMR spectroscopy were used as two common tools to study the interactions between ETP and MAA in the pre-polymerization mixture. Liquid chromatography experiments showed that the prepared MIP has recognition capability toward ETP in comparison with other structurally related compounds. The ETP-imprinted polymer was further applied for selective solid phase extraction (SPE) of ETP from a chicken tissue sample. The extraction yield of ETP was found to be quantitative (87 ± 3%) and the LOD and LOQ based on 3 and 10 times of the noise of HPLC profile were 0.05 and 0.32 ng ml?1, respectively. It was confirmed that the binding ability of the prepared MIP for ETP was essentially sufficient in the presence of other compounds coexisting in tissue sample. Therefore, as a selective and efficient solid phase material, ETP-imprinted polymer has a high potential application in the analysis of residues of this antibiotic in chicken tissue samples. 相似文献