Multivariate data analysis for enhanced interpretation of electrochemical impedance spectra of gramicidin-ion interactions in phospholipid monolayers
by Lindholm-Sethson, B.; Geladi, P.; Koeppe, R. E.; Jonsson, O.; Nilsson, D.; Nelson, A.
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.
- Journal
- Langmuir
- Volume
- 23
- Issue
- 9
- Year
- 2007
- Start Page
- 5029-5032
- URL
- https://dx.doi.org/10.1021/la062850j
- ISBN/ISSN
- 1520-5827; 0743-7463
- DOI
- 10.1021/la062850j