Document Detail

Electrostatic potential barrier in asymmetric planar lipopolysaccharide/phospholipid bilayers probed with the valinomycin-K+ complex.
MedLine Citation:
PMID:  1449594     Owner:  NLM     Status:  MEDLINE    
Using the carrier-ion complex valinomycin-K+, current/voltage (I/U) characteristics were registered for planar asymmetric lipid bilayers composed on one side of a phospholipid mixture and on the other side of rough mutant lipopolysaccharide. This system resembles the lipid matrix of the outer membrane of Gram-negative bacteria. The evaluation of the current/voltage curves yielded a highly asymmetric electrical potential barrier. The total potential difference between the phospholipid and the lipopolysaccharide was -85 mV, a result which cannot be explained by contributions of Gouy-Chapman potentials alone. The possible contribution of dipole potentials and influences of headgroup effects are discussed. It is shown that the asymmetry of the I/U-characteristic results from the differences of the surface charge densities of the two monolayers but not from those of the states of order of their hydrocarbon chains.
U Seydel; W Eberstein; G Schröder; K Brandenburg
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Zeitschrift für Naturforschung. C, Journal of biosciences     Volume:  47     ISSN:  0939-5075     ISO Abbreviation:  Z. Naturforsch., C, J. Biosci.     Publication Date:    1992 Sep-Oct
Date Detail:
Created Date:  1993-01-07     Completed Date:  1993-01-07     Revised Date:  2009-11-04    
Medline Journal Info:
Nlm Unique ID:  8912155     Medline TA:  Z Naturforsch C     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  757-61     Citation Subset:  IM    
Forschungsinstitut Borstel, Borstel, Bundesrepublik Deutschland.
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MeSH Terms
Carbohydrate Sequence
Electric Conductivity
Escherichia coli
Lipid Bilayers*
Lipopolysaccharides / chemistry*
Membrane Potentials
Models, Theoretical
Molecular Sequence Data
Phospholipids / chemistry*
Reg. No./Substance:
0/Lipid Bilayers; 0/Lipopolysaccharides; 0/Phospholipids; 2001-95-8/Valinomycin; 7440-09-7/Potassium

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

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