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分子印迹手性整体柱的制备及对非对映异构体的分离 总被引:16,自引:4,他引:16
采用原位分子印迹技术 ,单步制备了一种辛可宁印迹的手性整体柱。为了提高柱效和选择性 ,选择了相对低极性的甲苯 /十二醇复合致孔体系。在等度及梯度洗脱条件下 ,非对映异构体辛可宁与辛可尼丁被完全分离。等度洗脱中相对较宽的峰可以在梯度洗脱中得到改善。同时考察了流动相中醋酸浓度、流速以及温度对分离的影响。由于柱中存在大的流通孔 ,大大降低了分离过程中的柱压降 ,从而使这种柱能够在相对高的流速下使用。提高温度可以提高分离因子 ,在 60℃获得最大分离因子 5 40。 相似文献
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三甲氧基苄啶分子印迹整体柱的制备及色谱性能 总被引:2,自引:0,他引:2
选择甲基丙烯酸为功能单体\, 甲基丙烯酸乙二醇双酯为交联剂, 制备了三甲氧基苄啶分子印迹整体柱, 对整体柱材料的形貌进行了表征, 并且研究了TMP和5种磺胺类药物在分子印迹整体柱上的色谱行为. 相似文献
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三聚氰胺分子印迹整体柱识别性能的研究 总被引:1,自引:0,他引:1
以三聚氰胺(MAM)为模板分子,甲基丙烯酸(MAA)为功能单体,二甲基丙烯酸乙二醇酯(EGDMA)为交联剂,原位聚合法制备了对MAM有很强选择性识别能力的分子印迹整体柱。采用脉冲洗脱法快速筛选MAM的洗脱剂,通过前沿色谱法测定了整体柱对MAM的结合容量。实验表明,所制备的印迹整体柱对MAM有极强亲和作用力,即使在强极性流动相中(甲醇或甲醇-水(V/V=80/20)),MAM在印迹柱上也有强保留,不被洗脱。实验测得结合位点数(Lt)和解离常数(Kd)分别为:印迹柱Lt=2.28×103μmol/g,Kd=2.45×10-5mol/L;空白柱Lt=366μmol/g,Kd=23.7mo/L。该印迹整体柱有望作为固相萃取柱,在线或离线选择性富集样品中的MAM。 相似文献
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微波聚合快速制备分子印迹毛细管电色谱整体柱 总被引:10,自引:0,他引:10
以甲基丙烯酸为功能单体、己二醇二甲基丙烯酸酯为交联剂、 对羟基苯甲酸为模板分子, 采用微波辐射聚合的方式快速制备了分子印迹毛细管电色谱整体柱, 并取得了较好的印迹效果. 分子印迹材料的原位制备5 min即可完成, 大大快于国内外传统的方法. 相似文献
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Water-compatible ciprofloxacin-imprinted monolithic columns were synthesized in water-containing systems for selective extraction of ciprofloxacin from human urine samples. Methanol-water (10:3, v/v) was used as a porogenic solvent and the obtained monolithic imprinted polymers reveal high selectivity to ciprofloxacin in an aqueous environment; the affinity can be easily controlled by adjusting the pH of the mobile phase. Owing to the unique porous structure and flow-through channels existing in the network skeleton of the monolithic MIP, urine samples could be directly injected into the column, proteins and other biological matrix were quickly washed out and ciprofloxacin was selectively retained and enriched. Good linearity was obtained from 0.08 to 400 mg/L (r=0.998) with the relative standard deviations less than 3.6%. The limit of detection of the method was 0.04 mg/L and the recoveries were more than 94.5% at three different concentrations. Moreover, by increasing the injection volume to 2.0 mL, the sensitivity of the method could be improved 100-fold according to the peak height of ciprofloxacin. This expedient greatly simplified the overall procedure, resulting in a rapid and efficient sample analysis while maintaining precision and accuracy. 相似文献
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选用1-乙烯基-3-乙基咪唑四氟硼酸盐([VElm]BF4,一种离子液体)作为功能单体,以Co2+为介导离子,结合1-丁基-3-甲基咪唑四氟硼酸盐([BMIM]BF4)/二甲基亚砜(DMSO)二元致孔体系制备了绿原酸印迹整体柱。经过对制备参数的考察,确定最佳比例为绿原酸:Co2+:[VElm]BF4:EDMA(乙二醇二甲基丙烯酸酯)(摩尔比)=1:1:5:20,[BMIM]BF4:DMSO=3:1(V/V),最大印迹因子达2.10。通过优化色谱条件,最终在乙腈:20 mmol/L乙酸钠缓冲液(pH 4.2)=70:30(V/V)时实现了绿原酸及其类似物的完全分离。由此可见,以离子液体为功能单体及致孔剂,在金属介导策略下制备的分子印迹聚合物可实现绿原酸的特异性识别及分离。 相似文献
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Determination of tetracyclines in food samples by molecularly imprinted monolithic column coupling with high performance liquid chromatography 总被引:4,自引:0,他引:4
A novel solid phase extraction (SPE) method for determination of tetracyclines (TCs) in milk and honey samples by molecularly imprinted monolithic column was developed. Using tetracycline (TC) as the template, methacrylic acid (MAA) as the functional monomer, ethylene glycol dimethacrylate (EGDMA) as the cross-linker, methanol as the solvent, cyclohexanol and dodecanol as the mixed porogenic solvents, a TC imprinted monolithic column was prepared by in situ molecular imprinting technique for the first time, and the optimal synthesis conditions and the selectivity of TC imprinted monolithic column were investigated. The interfering substances in food samples and TCs can be separated successfully on imprinted column. Molecularly imprinted solid phase extraction (MISPE) coupling with C18 column was used to determinate the TCs in milk and honey. The recoveries of this method for six tetracyclines antibiotics such as tetracycline (TC), oxytetracycline (OTC), minocycline (MINO), chlortetracycline (CTC), metacycline (MTC) and doxycycline (DTC) were investigated, and high recoveries of 73.3-90.6% from milk samples and 62.6-82.3% from honey samples were obtained. A method for determination of TCs at low concentration level in milk and honey samples was successfully developed by using the monolithic column as the precolumn for solid phase extraction of six TCs compounds. 相似文献
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An S‐mandelic acid imprinted chitosan resin was synthesized by cross‐linking chitosan with glutaraldehyde in 2% acetic acid solution. S‐Mandelic acid imprinted chitosan resin was used to enantioselectively separate racemic mandelic acid in aqueous medium. When keeping the pH of sample solution (100 mM Tris‐H3PO4) at 3.5 and adsorption time at 40 min, the enantiomer excess of mandelic acid in supernatant was 78.8%. The adsorption capacities of S‐mandelic acid imprinted chitosan resin for S‐ and R‐mandelic acid were determined to be 29.5 and 2.03 mg/g, respectively. While the adsorption capacities of non‐imprinted cross‐linked chitosan for S‐ and R‐mandelic acid were 2.10 and 2.08 mg/g, respectively. The result suggests that the imprinted caves in S‐mandelic acid imprinted chitosan resin are highly matched with S‐mandelic acid molecule in space structure and spatial arrangement of action sites. Interestingly, the enantiomer excess value of mandelic acid in supernatant after adsorption of racemic mandelic acid by R‐mandelic acid imprinted cross‐linked chitosan was 25.4%. The higher enantiomer excess value by S‐mandelic acid imprinted chitosan resin suggests that the chiral carbons in chitosan and the imprinted caves in S‐mandelic acid imprinted chitosan resin combine to play roles for the enantioselectivity of S‐mandelic acid imprinted chitosan resin toward S‐mandelic acid. Furthermore, the excellent enantioselectivity of S‐mandelic acid imprinted chitosan resin toward S‐mandelic acid demonstrates that using chiral chitosan as functional monomer to prepare molecularly imprinted polymers has great potential in enantioseparation of chiral pharmaceuticals. 相似文献
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胃蛋白酶亲和有机聚合物毛细管整体柱的制备及性能考察 总被引:1,自引:0,他引:1
以热引发原位聚合方法制备了聚(甲基丙烯酸缩水甘油酯(glycidyl methacrylate,GMA)-乙二醇二甲基丙烯酸酯(ethyleneglycol dimethacrylate,EDMA))毛细管整体柱,对整体柱的性能进行了表征。结果表明,柱内部结构均匀、渗透性好;整体柱能够实现苯等中性小分子化合物的分离,具有反相色谱特征,重现性和稳定性良好。利用整体柱环氧基团的活性,采用间接法,以戊二醛为连接臂制备胃蛋白酶亲和手性整体柱。在毛细管电色谱模式下进行了柱分离性能研究,并对缓冲液pH值和运行电压等分离条件进行了考察。结果表明,亲和整体柱对4种碱性手性药物(奈福泮、氨氯地平、西酞普兰、扑尔敏)有拆分效果,奈福泮、氨氯地平、西酞普兰能达到基线分离。本文为蛋白质亲和毛细管电色谱整体柱的制备和应用提供了新的思路和方法。 相似文献
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采用超声法制备g-C3N4/NiO复合催化材料,将其滴涂在玻碳电极(GCE)表面构建g-C3N4/NiO/GCE催化电极。采用电聚合方法,以马尿酸为模板分子,邻苯二胺为功能单体构建M IP/g-C3N4/NiO/GCE传感器。采用时间-电流法对传感器制备条件优化。结果表明,复合催化材料对H2O2具有良好的催化效果。分子印迹传感器对马尿酸具有良好的选择性。在优化条件下,马尿酸质量浓度在0.05~2 mg/L范围内,电极电流响应与浓度呈良好的线性关系,检出限为7.1μg/L。将电极用于尿液中马尿酸的检测,回收率在87.3%~95.3%之间。 相似文献
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采用甲基丙烯酸月桂酯为基础功能单体,乙二醇二甲基丙烯酸酯为交联剂,正十二醇、1,4-丁二醇及二甲基亚砜为致孔剂,在内径为75 μm的石英毛细管内制备了具有良好机械性能及化学稳定性的反相毛细管整体柱。考察了致孔剂的种类、比例以及交联剂在单体混合物中的比例对柱压和分离效果的影响;以单体15%、交联剂15%、致孔剂70%(均为质量分数)作为优化配方,在70 ℃条件下反应24 h;并对所合成的毛细管整体柱进行了电镜表征,测试了流速、柱长与柱压的关系。结果表明,毛细管整体柱的通透性良好,可通过延长柱长的方法提高分离效果。将所制备的毛细管整体柱装于纳升级高效液相色谱仪上进行牛血清白蛋白及血浆样本的胰蛋白酶酶切液的分离,获得了比较理想的分离效果。 相似文献
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该文将光子晶体与分子印迹技术结合,制备了分子印迹光子晶体水凝胶膜(MIPHs)作为光学传感器,用于样品中三聚氰胺的快速识别检测。以三聚氰胺为模板分子,通过垂直沉降自组装、填充聚合、去除模板3个步骤,制备得到了反蛋白石结构的三聚氰胺MIPHs。扫描电子显微镜的形貌表征表明,MIPHs具有高度有序的三维大孔结构。该MIPHs作为光学传感器可以将三聚氰胺的分子特异识别过程转换成光学信号,在对目标分析物分析时具有选择性高、响应快、灵敏度高的优点。此外,可以根据MIPHs的颜色变化利用图像软件分析或裸眼识别的方式实现目标分析物快速识别。实验结果表明,在最优条件下,三聚氰胺浓度为10-11~10-6mol/L时,MIPHs的布拉格衍射峰位移从563 nm红移到608 nm,而对三聚氰胺的结构类似物没有明显响应。 相似文献
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针对青霉素药物及乳制品中致敏杂质青霉噻唑酸(PEOA)的特异性分离分析,采用表面印迹聚合法,以青霉噻唑酸为模板分子,制备青霉噻唑酸分子印迹聚合物(PEOA-MIPs)。通过静态吸附、吸附动力学及选择性实验考察其吸附性能,结果显示PEOA-MIPs对青霉噻唑酸有特异的识别能力和快速的传质速率,饱和吸附量为122.78 mg/g,静态吸附和吸附速率分别符合Langmuir模型和准二级动力学方程,表明MIPs的吸附是以化学吸附为主的单分子层吸附。利用扫描电镜(SEM)、红外光谱(FT-IR)和热重分析(TGA)对聚合物进行表征,结果显示聚合物成功接枝在硅胶表面,并具有良好的热稳定性。PEOA-MIPs对PEOA具有特异的识别能力,可用作萃取介质,为建立快速分离分析致敏杂质青霉噻唑酸的方法提供基础。 相似文献