請用此 Handle URI 來引用此文件: http://hdl.handle.net/11455/34921
標題: Characterization of cyclodextrin-modified infrared chemical sensors - Part I. Modeling the mechanisms of interaction
作者: Yang, J.S.
楊吉斯
Lin, H.J.
Huang, H.Y.
關鍵字: cyclodextrin
FT-IR
aromatic acids
inclusion complex
evanescent wave
host-guest interactions
alpha-cyclodextrin
inclusion reactions
dynamic aspects
molecular recognition
aromatic-compounds
complexes
chemistry
acid
期刊/報告no:: Analytica Chimica Acta, Volume 527, Issue 1, Page(s) 27-36.
摘要: To explore the proper-ties of cyclodextrins (CDs) as an optical sensing phase, the behavior of immobilized CD in interaction with analytes was studied in this work. CDs having different cavity sizes were immobilized onto the surface of infrared (IR) internal reflection-sensing element (IRE) to kinetically monitor the behavior of CD in interaction with analytes. Several aromatic compounds having various molecular sizes and functional groups were used to characterize the interaction mechanism. A two-layer modification method was proposed in this work, which utilized a thin hydrophobic film (polyvinyl benzyl chloride) to stick on the IRE and to covalently bond to the CDs through an ethylene diamine linker. The synthesized CD phases exhibited high stability in aqueous solution. To analyze the behavior during the formation of complexes between the guest molecules and the CD phases, we modeled the interaction behavior and treated the kinetic data with the theoretical equations developed in this work. The results indicate that the behavior of the interaction between guest molecules and CDs was explained by considering the formation of two types of complexes: adsorbed complexes and inclusion complexes. The formation of the inclusion complexes was relatively fast, the time required to reach equilibrium could be shorter than a few minutes. The adsorbed complexes were also observed. but their rate of formation was relatively stow; equilibrium could be reached at times greater than 60 min. Based on the signals observed under equilibrium conditions, the concentration of inclusion complexes was approximately three times than that of the adsorbed complexes. (C) 2004 Elsevier B.V. All rights reserved.
URI: http://hdl.handle.net/11455/34921
ISSN: 0003-2670
文章連結: http://dx.doi.org/10.1016/j.aca.2004.08.062
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