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Multivariate Data Analysis for Enhanced Interpretation of Electrochemical Impedance Spectra of Gramicidin-Ion Interactions in Phospholipid Monolayers
Umeå University, Faculty of Science and Technology, Department of Chemistry.
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2007 (English)In: Langmuir, Vol. 23, no 9, 5029-32 p.Article in journal (Refereed) Published
Abstract [en]

This article describes a multifrequency electrochemical impedance study of phospholipid monolayers on a mercury drop electrode in solutions containing electrolytes and gramicidin derivatives: gramicidin A (gA), gramicidin-BOC (g-BOC), and desformylgramicidin (g-des). The impedance spectra have been studied individually (univariate approach) and also transformed using a multivariate data reduction method (multivariate approach). It was shown that the two approaches are complementary. Thus the formation of K+-conducting channels is observed in gA only, and these channels can be distinguished from an interaction of all gramicidin derivatives with Mg2+. An unknown peptide interaction in the monolayer was observed on a slow time scale.

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2007. Vol. 23, no 9, 5029-32 p.
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URN: urn:nbn:se:umu:diva-14455DOI: 10.1021/la062850jOAI: oai:DiVA.org:umu-14455DiVA: diva2:154126
Available from: 2007-06-04 Created: 2007-06-04 Last updated: 2013-03-14Bibliographically approved

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Lindholm-Sethson, BrittaNilsson, David

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