共查询到19条相似文献,搜索用时 125 毫秒
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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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以溶菌酶为模板蛋白质,结合分子印迹技术在硅烷化的基质玻片上制备了溶菌酶分子印迹聚合物膜。实验优化了溶菌酶聚合物膜的印迹体系,考察了溶菌酶分子印迹聚合物膜的吸附平衡时间、最大吸附量、特异识别能力、重复使用性以及对实际样品中溶菌酶的分离情况。结果表明,在最优条件下,制备的分子印迹聚合物膜对溶菌酶具有特异吸附能力,印迹因子为3.0,吸附平衡时间为5 min,吸附行为符合Langmuir吸附模型,理论最大吸附量为42.5 mg/g,实际样品中的吸附量为30 mg/g。且此印迹聚合物膜在重复使用5次后,最大吸附量仅下降了5%,具有良好的重复使用性。该方法为复杂生物样品中目标蛋白质的分离富集提供了一种快速、高效的手段。 相似文献
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莠去津分子印迹聚合物的合成及识别性能研究 总被引:1,自引:0,他引:1
以莠去津为模板分子,α-甲基丙烯酸为功能单体,在氯仿溶剂中合成了莠去津分子印迹聚合物.紫外光谱研究表明莠去津与功能单体α-甲基丙烯酸之间确实存在作用力,通过红外光谱分析了聚合物结构,可以确定模板分子与功能单体之间的作用力为氢键.利用透射电镜表征了溶剂用量对印迹聚合物微观形貌的影响,综合利用平衡结合实验考察了不同溶剂用量... 相似文献
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《Analytical letters》2012,45(11):1888-1899
The separation of a molecularly imprinted polymer for cordycepin was investigated. The synthesis employed cordycepin as the molecular template, alpha-methylacrylic acid as the functional monomer, glycol dimethyl acrylate as the cross-linking agent, azobisisobutyronitrile as the initiator, and tetrahydrofuran as the solvent and pore-foaming agent. The interaction between cordycepin and the functional monomer was investigated by ultraviolet-visible and infrared spectroscopy. The properties of the molecularly imprinted polymer were analyzed by scanning electron microscopy, equilibrium adsorption experiments, and the Scatchard equation. Static adsorption, solid phase extraction, and high-performance liquid chromatography experiments were employed to evaluate the adsorption properties and selective recognition characteristics. The results showed that the molecularly imprinted polymer had specific adsorption with cordycepin, and the maximum absorption capacity was 1920 µg/g. Scatchard analysis suggested that high affinity and low affinity binding sites were present. For the high affinity case, the dissociation constant and apparent maximum numbers of the binding sites were 0.0089 mmol/L and 4.78 µmol/g, respectively. The dissociation constant and apparent numbers of binding sites were 0.035 mmol/L and 6.047 µmol/g for the low affinity sites. Compared with the corresponding nonimprinted polymer, the cordycepin molecularly imprinted polymer exhibited higher adsorption and selectivity for cordycepin than structural analogs. 相似文献
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《Analytical letters》2012,45(7):1137-1145
Abstract A molecularly imprinted polymer was prepared using tert-butyloxycarbonyl-L-phenylalanine as the print molecule and methacrylic acid as the functional monomer. The bulk polymer obtained was ground, sieved, packed into a column and investigated in the HPLC-mode by frontal chromatography to determine the number of binding sites and dissociation constants for the enantiomers interacting with the polymer. The dissociation constant for the L-enantiomer of the print molecule was lower than for the D-enantiomer (6.3 mM and 8.1 mM, respectively). This means that the affinity for the L-enantiomer was higher than for the D-enantiomer. The number of binding sites in the polymer giving rise to these dissociation constants were determined to be 28 μmol per g dry polymer. 相似文献
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分子印迹聚合物是具有与模板分子形状、大小及官能团完全匹配的特异识别位点的高分子聚合物,能选择性识别、有效富集目标分析物(模板分子)并去除干扰物,已广泛应用于样品前处理、化学/生物传感、药物输送等领域.然而,在合成过程中,仍存在模板分子洗脱困难、有效识别位点少、结合容量低、传质速率慢等问题.核-壳型分子印迹聚合物即在核层颗粒表面进行分子印迹,即表面印迹,印迹位点仅存在于壳层结构中,利于模板分子洗脱及扩散,能够增加有效识别位点并提高印迹容量.依据核层材料的不同,本文详细介绍了以磁性材料及非磁性材料为核的核-壳型分子印迹聚合物的合成与应用,探讨了中空核-壳分子印迹聚合物的制备与发展,并对核-壳印迹聚合物的发展前景进行了展望. 相似文献
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安定分子印迹聚合物的制备及应用 总被引:1,自引:1,他引:0
以安定为模板分子,通过本体聚合和沉淀聚合的方法合成了分子印迹聚合物材料,考察了交联剂、致孔剂及温度等条件对聚合物材料性能的影响。电镜扫描图片显示本体聚合得到的聚合物呈不规则形状,而沉淀聚合得到的则是微球颗粒,形状规则。吸附实验表明,聚合物微球对安定的最大吸附量约为130μg/g,对奥沙西泮和硝西泮的吸附量约为110μg/g,对安定类化合物具有较高的吸附性能和选择性。通过对比合成现象和聚合物性能,最终选用以DVB为交联剂、乙腈为致孔剂合成的聚合物微球为固相萃取材料填充固相萃取小柱,从饲料及猪尿样品中选择性地分离、富集痕量安定类药物。结合高效液相色谱法检测,奥沙西泮、硝西泮和安定3种药物在0.1~20 mg/L范围内线性良好,相关系数为0.999 6~0.999 9,检出限(S/N=3)为0.03~0.08 mg/L,加标回收率为66%~79%。该方法为安定类药物的检测提供了一种新途径。 相似文献
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Yanjun Tong Yu Xin Hailin Yang Ling Zhang Yuran Zhang Yi Chen Xiaole Xia Wu Wang 《Chromatographia》2011,74(5-6):443-450
Methacrylic acid and ethylene glycol dimethacrylate were respectively used as functional monomer and cross-linker to synthesize molecularly imprinted polymers (MIPs), for adsorption of glutathione (GSH), named GSH-MIPs. Evaluation of various polymers by static experiment indicated the optimum ratio of template to functional monomer was 1:4; the optimal concentration and pH of loading buffer were 5.00?C6.50 mmol L?1 and 5.0, respectively. By Scatchard analysis, the GSH binding site was found in GSH-MIPs, with K d and Q max of 1.96 mmol L?1 and 47.19 ??mol g?1, respectively. The method validated the extraction of GSH from yeast cells samples with the enrichment rate of 76%. 相似文献