Document Detail

Complex numbers in chemometrics: examples from multivariate impedance measurements on lipid monolayers.
MedLine Citation:
PMID:  17605995     Owner:  NLM     Status:  MEDLINE    
Electrical impedance gives multivariate complex number data as results. Two examples of multivariate electrical impedance data measured on lipid monolayers in different solutions give rise to matrices (16x50 and 38x50) of complex numbers. Multivariate data analysis by principal component analysis (PCA) or singular value decomposition (SVD) can be used for complex data and the necessary equations are given. The scores and loadings obtained are vectors of complex numbers. It is shown that the complex number PCA and SVD are better at concentrating information in a few components than the naïve juxtaposition method and that Argand diagrams can replace score and loading plots. Different concentrations of Magainin and Gramicidin A give different responses and also the role of the electrolyte medium can be studied. An interaction of Gramicidin A in the solution with the monolayer over time can be observed.
Paul Geladi; Andrew Nelson; Britta Lindholm-Sethson
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-01-21
Journal Detail:
Title:  Analytica chimica acta     Volume:  595     ISSN:  1873-4324     ISO Abbreviation:  Anal. Chim. Acta     Publication Date:  2007 Jul 
Date Detail:
Created Date:  2007-07-03     Completed Date:  2007-08-07     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370534     Medline TA:  Anal Chim Acta     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  152-9     Citation Subset:  IM    
Unit of Biomass Technology and Chemistry, Swedish University of Agricultural Sciences, Box 4097, SE 90403 Umeå, Sweden.
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MeSH Terms
Electric Impedance
Electrochemistry / methods
Lipids / analysis,  standards
Multivariate Analysis
Unilamellar Liposomes / analysis*,  standards*
Reg. No./Substance:
0/Lipids; 0/Unilamellar Liposomes

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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