共查询到20条相似文献,搜索用时 336 毫秒
1.
2.
以杨梅黄素(MYR)为模板分子、2-乙烯基吡啶(2-VP)为功能单体、二甲基乙二醇丙烯酸酯(EDMA)为交联剂,偶氮二异丁腈(AIBN)为引发剂,甲醇为致孔剂,采用分子印迹技术制备了杨梅黄素分子印迹聚合物(MYR-MIP)。通过红外光谱、扫描电镜、热重分析等技术表征了MYR-MIP的理化性能;采用紫外光谱分析研究了MYR-MIP对MYR的等温吸附和动力学吸附特性,研究结果表明MYR-MIP对MYR具有良好的特异性吸附,并且在2 h内达到平衡吸附;高效液相色谱分析表明MYR-MIP对MYR具有优良的选择识别特性。 相似文献
3.
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
4.
5.
采用本体聚合法以黄杉素(Taxifolin,TAX)为模板分子,2-乙烯基吡啶(2-Vpy)为功能单体,乙二醇二甲基丙烯酸酯(EDMA)为交联剂,制备了黄杉素分子印迹聚合物(TAX-MIP)。通过紫外光谱考察了TAX与2-Vpy的非共价作用,并采用静态和动态结合实验评价了TAX-MIP对底物分子的结合特性。结果表明,TAX与2-Vpy通过静电作用形成主客体配合物,其结合常数和化学配位比分别为K=6.06×10 10(mol/L)-4和n=4;TAX-MIP对TAX存在不同亲和力的两类结合位点,并对TAX显示出很高的选择吸附特性和良好的分子识别性能;TAX-MIP对TAX的吸附符合准二级反应动力学方程。 相似文献
6.
以邻苯二甲酸二丁酯(DBP)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(EGD-MA)为交联剂,采用沉淀聚合法制备了分子印迹聚合物。通过静态平衡结合法和Scatchard分析法,研究了分子印迹聚合物的识别性能和结合能力。结果表明,该分子印迹聚合物对模板分子DBP具有较强的吸附特性和很好的选择性,其识别因子可达4.19。Scatchard分析表明,印迹聚合物微球存在2类不同的结合位点。高结合位点的平衡离解常数Kd1=0.078 mg/L,最大表观结合量Qmax1=53.03 mg/g;低结合位点的离解常数Kd2=0.023 mg/L,最大表观结合量Qmax2=33.95 mg/g。 相似文献
7.
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
8.
以纳米TiO2为牺牲载体,绿原酸为模板分子,甲基丙烯酸(MAA)、二甲基丙烯酸乙二醇酯(EGDMA)及偶氮二异丁腈(AIBN)分别为功能单体、交联剂及引发剂,制备了绿原酸印迹聚合物。用傅里叶红外光谱(FTIR)和扫描电镜(SEM)研究了聚合物结构,静态吸附法研究了模板在聚合物上的结合特性。结果表明:除去纳米TiO2基质后的中空分子印迹聚合物H-MIP对模板分子具有较强的吸附能力和较高的吸附选择性(相对选择系数为3.353)。Freundlich模型比Langmuir模型更适合描述H-MIP对模板的等温吸附。将分子印迹聚合物H-MIP用于对杜仲甲醇提取液中绿原酸进行固相微富集时,表现了较好的吸附效果。 相似文献
9.
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
10.
11.
A new molecularly imprinted polymer (KAE-MPS/SiO2) with high performance for recognizing kaempferol (KAE) was prepared by adopting the surface molecular imprinting technique
with silica nanoparticles modified with 3-methacryloxypropyltrimethoxysilane (MPS) as a carrier material, 2-vinylpridine as
the functional monomer and ethylene glycol dimethacrylate as the crosslinker. The static adsorption experiments indicated
that KAE-MPS/SiO2 had significantly higher adsorption capacity for KAE than its non-imprinted polymers. Scatchard analysis revealed that two
classes of binding sites were formed in KAE-MPS/SiO2 with dissociation constants of 0.26 and 2.34 μmol/mL, and the maximum apparent binding capacity was 3.33 and 16.16 μmol/g,
respectively. The selectivity coefficients of KAE-MPS/SiO2 for KAE in relation to competition species myricetin and chlorogenic acid were 2.51 and 4.24, respectively, which suggested
that KAE-MPS/SiO2 had high recognition selectivity and binding affinity for the template KAE. Dynamic binding study showed that the KAE-MPS/SiO2 had good site accessibility and mass transport for KAE. The KAE-MPS/SiO2 can be reused many times without decreasing their adsorption capacities significantly. 相似文献
12.
13.
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. 相似文献
14.
15.
Shinhui Lee Hee-Soo Seol Sanung Eom Jaeeun Lee Chaelin Kim Jong-Hwan Park Tae-Hwan Kim Junho H. Lee 《International journal of molecular sciences》2022,23(1)
Monoamine serotonin is a major neurotransmitter that acts on a wide range of central nervous system and peripheral nervous system functions and is known to have a role in various processes. Recently, it has been found that 5-HT is involved in cognitive and memory functions through interaction with cholinergic pathways. The natural flavonoid kaempferol (KAE) extracted from Cudrania tricuspidata is a secondary metabolite of the plant. Recently studies have confirmed that KAE possesses a neuroprotective effect because of its strong antioxidant activity. It has been confirmed that KAE is involved in the serotonergic pathway through an in vivo test. However, these results need to be confirmed at the molecular level, because the exact mechanism that is involved in such effects of KAE has not yet been elucidated. Therefore, the objective of this study is to confirm the interaction of KAE with 5-HT3A through electrophysiological studies at the molecular level using KAE extracted from Cudrania tricuspidata. This study confirmed the interaction between 5-HT3A and KAE at the molecular level. KAE inhibited 5-HT3A receptors in a concentration-dependent and voltage-independent manner. Site-directed mutagenesis and molecular-docking studies confirmed that the binding sites D177 and F199 are the major binding sites of human 5-HT3A receptors of KAE. 相似文献
16.
17.
18.
Uniform molecularly imprinted polymer beads were synthesized by precipitation polymerization for separation of triazine herbicides. A series of imprinted polymers were prepared using ametryn as template and divinylbenzene as crosslinking monomer, in combination with three different functional monomers under different solvent conditions. Under optimized reaction conditions, we obtained uniform molecularly imprinted polymer microspheres that display favorable molecular binding selectivity for triazine herbicides. The imprinted polymer beads synthesized using methacrylic acid as functional monomer in a mixture of methyl ethyl ketone and heptane showed the best results in terms of particle size distribution and molecular selectivity. Compared with nonimprinted polymer microspheres, the imprinted microspheres displayed significantly higher binding for a group of triazine herbicides including atrazine, simazine, propazine, ametryn, prometryn, and terbutryn. For the first time, precipitation polymerization has been used to produce highly uniform imprinted microspheres suitable for affinity separation of triazine herbicides. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012 相似文献
19.
Molecularly imprinted polymers (MIPs) have been extensively used in chemical and biochemical related areas due to their high molecular recognition affinity and selectivity for the target molecule. On the other hand, supercritical polymerization is relatively novel technique, which can be applied in the polymerization without hazard organic solvent. This work introduces a supercritical fluid polymerization technique for preparation of MIP particles. The adsorption properties of prepared MIP particles are also investigated. The MIPs were prepared with methyl methacrylate (MMA) as a third monomer, methacrylic acid (MAA) as a functional monomer, templates (bisphenol A (BPA) and 2,4-dichlorophenoxyacetic acid (2,4-D)), methyl methacrylate (MMA) as a third vinyl monomer and ethylene glycol dimethacrylate (EGDMA) as a cross-linker. Equilibrium binding experiments are conducted to evaluate the binding characteristics of MIPs and templates (BPA and 2,4-D). The Scatchard plot analysis demonstrates that two classes of binding sites are formed with the equilibrium dissociation constants. The adsorption ability of the MIPs was also evaluated by measuring the adsorbed amounts of a similar imprinted template structure, the selectivity factor (α), and the imprinting-induced promotion of binding (IPB). 相似文献
20.
Surface molecularly imprinted polymer microspheres based on nano‐TiO2 for selective recognition of kaempferol
下载免费PDF全文
![点击此处可从《应用聚合物科学杂志》网站下载免费的PDF全文](/ch/ext_images/free.gif)
The molecular imprinting technique is a new method for preparing molecularly imprinted polymers (MIPs) with specific molecular recognition sites for certain target molecules. In this study, a novel, facile preparation method was presented, called “seed precipitation polymerization,” for the synthesis of MIPs via surface imprinting and a support matrix. In the polymerization process, kaempferol was used as the template molecule, methacrylic acid as the functional monomer, nano‐TiO2 as the support, azodiisobutyronitrile as the initiator, and ethylene glycol dimethacrylate as the crosslinker in acetonitrile solvent. The synthesized T‐MIP and MIP were analyzed by infrared spectroscopy and scanning electron microscopy. In addition, the obtained polymers were evaluated by adsorption isotherms and dynamic curves for their selective recognition properties for kaempferol. The results show that T‐MIP shows regular spherical particles; the adsorption dynamic curves of T‐MIP show that the adsorption capacity increases with time and reaches a maximum value and then finally reaches equilibrium, and the T‐MIP exhibits a higher affinity for kaempferol than does the MIP. The adsorption follows pseudo‐second‐order kinetics, the Freundlich adsorption equation fits the experimental data well, and there is strong evidence for multiple‐layer adsorption. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 44888. 相似文献