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Reference type: Journal
Authors: de Dios AS, Fern�ndez-Gonz�lez A, Bad�a-La��o R, D�az-Garc�a ME
Article Title: Insights Into the Molecular Recognition Mechanism of 5-Hydroxy-Indol Acetic Acid by Imprinted Xero-Gel Materials.
Publication date: 2013
Journal: Science of Advanced Materials
Volume: 5
Issue: (12)
Page numbers: 1940-1947.
DOI: 10.1166/sam.2013.1660
Alternative URL: http://www.ingentaconnect.com/content/asp/sam/2013/00000005/00000012/art00017

Abstract: Molecular recognition by molecularly imprinted polymers is based on the interaction of the template molecule and the polymeric matrix, usually through hydrogen bonds and/or hydrophobic interactions. In this work, we used different spectroscopic techniques in order to shed light on the recognition process of 5-hydroxyindolacetic acid (5-HIAA) by a molecularly imprinted silica-based xero-gel. X-ray photoelectron spectroscopy as well as infrared spectroscopy is used to reveal the recognition process. From the data, a double interaction mechanism can be confirmed which involves (a) hydrogen bonds between the surface hydroxyl groups of the imprinted xero-gel and the hydroxyl-moiety of 5-HIAA and (b) π-π stacking interactions among the aromatic residues in the xero-gel provided by the phenyltrimethoxysilane precursor and the indol group of the 5-HIIA
Author keywords: ATR-FTIR, molecular imprinting, molecular recognition, photoelectron spectroscopy, XPS

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