共查询到18条相似文献,搜索用时 62 毫秒
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采用本体聚合法以D-对羟基苯甘氨酸(D-HPG)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(EDMA)为交联剂,制备了D-HPG分子印迹聚合物(DMIP)。通过紫外光谱法研究了D-HPG与AM间的相互作用;采用静态和动态结合实验考察了DMIP对D-HPG的结合特性及识别性能。结果表明,DMIP中存在对D-HPG具有不同亲和力的两类结合位点,并具有较高的选择性吸附性能和良好的分子识别能力,DMIP对D-HPG的吸附行为可用准二级吸附动力学方程进行描述。 相似文献
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以D-3-溴代樟脑-8-磺酸铵(简称D-ABCS)为拆分剂,冰醋酸为溶剂,加少量浓硫酸,以水杨醛为催化剂,使目标对映体的拆分及非目标对映体的外消旋化同时进行,获得高收率、高纯度的D-对羟基苯甘氨酸。 相似文献
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采用分子印迹技术制备了异丙酚分子印迹聚合物,并考察其结合特性和选择性。以异丙酚为模板分子,甲基丙烯酸为功能单体,二甲基丙烯酸乙二醇酯为交联剂,偶氮二异丁腈为引发剂,甲苯、正己烷为溶剂合成异丙酚分子印迹聚合物。通过平衡吸附实验,研究了异丙酚分子印迹聚合物的结合特性和选择性。Scatchard模型分析表明,在该聚合物中存在对异丙酚有不同亲和力的两类作用位点。此聚合物与异丙酚的结合要优于麝香草酚。此方法可合成异丙酚分子印迹聚合物,通过结合实验和对底物选择性考察,表明该聚合物对异丙酚具有良好的选择性。 相似文献
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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%. 相似文献
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《分离科学与技术》2012,47(1):74-80
Oleuropein has many antimicrobial, antiviral, and anticancer features found in olive leaf. Therefore, its isolation from olive leaf is very important in such kinds of applications. In this study, a solid-phase extraction system based on the molecularly imprinted polymer (MIP) was proposed for the selective separation of oleuropein from olive leaf. First, oleuropein imprinted polymer has been prepared by the suspension polymerization using methacrylolamidoantiprine–iron (III) metal-chelate monomers. After that, the oleuropein adsorption capacity and selectivity of the prepared imprinted polymer has been determined. The maximum adsorption capacity of oleuropein has found to be 140 mg g?1. Finally, MIP has been used as a sorbent in the solid-phase extraction for the separation of oleuropein from crude extract of olive leaves. The oleuropein analyses have been realized by high performance liquid chromatography. The obtained results indicated that the prepared molecularly imprinted sorbent could be used for at least 10 times for purification of oleuropein from olive leaf. The application of the proposed system in the real sample showed that 24.2 mg pure oleuropein could be obtained from 1.0 g of crude olive leaf extract. As a result, the low cost, simple, and selective adsorbent has been developed for oleuropein adsorption. Supplemental materials are available for this article. Go to the publisher's online edition of Separation Science & Technology to view the supplemental file. 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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大黄酚分子印迹聚合物合成及其性能评价 总被引:1,自引:0,他引:1
以中药大黄的主要成分大黄酚为印迹分子,4-乙烯基毗啶为功能单体,乙二醇二甲基丙烯酸酯(EDMA)为交联剂,采用封管聚合法合成大黄酚分子印迹聚合物,通过静态吸附法和Scatchard分析法研究了此印迹聚合物的结合能力和选择性,结果表明:印迹聚合物对大黄酚有较高的亲和性和选择性。 相似文献
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Scorrano S Mergola L Del Sole R Vasapollo G 《International journal of molecular sciences》2011,12(3):1735-1743
Fmoc-3-nitrotyrosine (Fmoc-3-NT) molecularly imprinted polymers (MIPs) were synthesized to understand the influence of several functional monomers on the efficiency of the molecular imprinting process. Acidic, neutral and basic functional monomers, such as acrylic acid (AA), methacrylic acid (MAA), methacrylamide (MAM), 2-vinylpyridine (2-VP), 4-vinylpyridine (4-VP), have been used to synthesize five different polymers. In this study, the MIPs were tested in batch experiments by UV-visible spectroscopy in order to evaluate their binding properties. The MIP prepared with 2-VP exhibited the highest binding affinity for Fmoc-3NT, for which Scatchard analysis the highest association constant (2.49 × 10(4) M(-1)) was obtained. Furthermore, titration experiments of Fmoc-3NT into acetonitrile solutions of 2-VP revealed a stronger bond to the template, such that a total interaction is observed. Non-imprinted polymers as control were prepared and showed no binding affinities for Fmoc-3NT. The results are indicative of the importance of ionic bonds formed between the -OH residues of the template molecule and the pyridinyl groups of the polymer matrix. In conclusion, 2-VP assists to create a cavity which allows better access to the analytes. 相似文献
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