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Authors
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Ouyang, W. ; Müller, M. ; Appelhans, D. ; Voit, B.
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Title
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In situ ATR-FTIR investigation on the preparation and enantiospectificity of chiral polyelectrolyte multilayers
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Date
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27.11.2009
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Number
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21822
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Abstract
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Chiral polyelectrolyte multilayers (PEMs) consisting of poly(l-lysine) (PLL), poly(N-(S)alkylated 4-vinylpyridinium iodide), or poly(ethyleneimine maltose) (PEI-m) as polycations and poly(styrenesulfonic acid) sodium salt (PSS) or poly(vinyl sulfate) as polyanions, as well as a nonchiral PEM composed of poly(ethyleneimine) (PEI) and PSS were deposited on silicon substrates and poly(tetrafluoroethylene) membranes using the layer-by-layer method. For these PEMs, enantiospecific interaction toward one enantiomer of either l/d-glutamic acid (l/d-GLU), l/d-tryptophan, or l/d-ascorbic acid (l/d-ASC), respectively, was studied under variation of the concentration, pH, and ionic strength. Both deposition and enantiospecific interaction were analyzed by attenuated total reflection Fourier transform infrared spectroscopy. Our results show a significant enantiospecific preference of d-GLU over l-GLU at PEMs containing PLL and of d-ASC over l-ASC at PEMs containing PEI-m. No such enantiospecific preference was found for nonchiral PEMs containing PEI. The enantiospecificity of PEMs of PLL/PSS toward l/d-GLU could be significantly influenced by the ionic strength and pH values, so that increasing attractive electrostatic interactions resulted in higher enantiospecificity.
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Publisher
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ACS Applied Materials & Interfaces
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Wikidata
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Citation
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ACS Applied Materials & Interfaces 1 (2009) 28782885
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DOI
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https://doi.org/10.1021/am900597c
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Tags
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chiral surface polyelectrolyte multilayer enantiospecific interaction amino acids ascorbic acid permeation secondary structure thin-films salt spectroscopy weak ph poly(l-lysine) separations orientation adsorption
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