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《Journal of Functional Polymers》 2005-01
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Study on the Molecular Imprinted Polymers with Recognition Properties Towards to Dibenzoyl-tartaric Acid Prepared by Photo-polymerization Method Ⅱ. Characterizing Molecular Recognition Properties

YANG Zuo-guo, XU Zhen-liang(Chemical Engineering Research Center, East China Univesity of Science and Technology, Shanghai 200237,China)  
Using a functional monomer(methyl methacrylate, acrylamide, ethyl acrylate or acrylic acid) and a crosslinker(TMPTA), molecularly imprinted polymers(MIPs) with recognition properties to dibenzoyl-L-tartaric acid(L-DBTA) were prepared by photopo-polymerization method in the presence of a template(L-DBTA) in acetonitrile solution. High-performance liquid chromatographic (HPLC) analysis of molecularly imprinted polymers (MIPs) of dibenzoyl-L-tartaric acid (L-DBTA) with recognition properties were conducted to evaluate the influences of various factors on DBTA binding. The experimental results indicated that the MIPs had higher L-DBTA binding ability than D-DBTA′s and also higher than corresponding non-imprinted polymers. Based on Scatchard analysis, one kind of binding sites was formed in the L-DBTA MIPs. At 293.15K, its equilibrium dissociation constant(K_d) was 0.064mmol/L while the maximum apparent binding capacity(Q_m) was 6.4mg/g. On the basis of isothermal binding thermodynamic investigation, the recognition mechanism between L-DBTA and MIP recognition group was described by Langmuir isothermal binding. Therefore, some thermodynamic parameters were obtained: ΔH=7.40kJ/mol, ΔS=42.74J/mol.K, ΔG_(298)=-5.34kJ/mol. The kinetics analysis illustrated that the interaction between L-DBTA and MIP was very fast and the apparent activation energy was 7.40kJ/mol.
【Fund】: 国家重点基础研究发展计划(973计划)资助(2003CB615705)
【CateGory Index】: TQ316.3
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