Journal
JOURNAL OF LIPID RESEARCH
Volume 46, Issue 2, Pages 245-251Publisher
ELSEVIER
DOI: 10.1194/jlr.M400155-JLR200
Keywords
lipid membranes; cholestrol; electrometer
Categories
Ask authors/readers for more resources
The effect of palmitic acid (PA) and oleic acid (OA) on electrical parameters of planar membranes was studied. We found a substantial difference between the effects of PA and OA on proton transfer. PA induced a small increase in conductance, requiring a new technique for estimating proton-mediated currents across low-conductance planar bilayers in which an electrometer is used to measure the transmembrane current under virtual short circuit (SCC). Open-circuit voltage and SCC were used to determine proton and leak conductances. CIA caused a marked increase in membrane conductance, allowing the use of a voltage-clamp technique.jlr From SCC data, we were able to estimate the flip-flop rate constants for palmitate (1 x 10(-6) s(-1)) and oleate (49 x 10(-6) s(-1)) anions. Cholesterol, included in the membrane-forming solution, decreased importantly the leak con ductance both in membranes unmodified by FA and in membranes modified by PA added to the bath.-Brunaldi, K., M. A. Miranda, E Abdulkader, R. Curi, and J. Procopio. Fatty acid flip-flop and proton transport determined by short-circuit current in planar bilayers.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available