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Biophysical Journal 36: 735-741 (1981)
© 1981 the Biophysical Society

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Studies of chromophores in model membranes by polarized light-absorption spectroscopy. The orientation and binding of tetracaine and procaine.

L B Johansson and G Lindblom

ABSTRACT

A method for studying the orientation and binding of chromophores in macroscopically aligned membranes by polarized light absorption spectroscopy is described. Here tetracaine and procaine solubilized in a lamellar phase of octanoyl-1-glyceride (monooctanoin) and water have been investigated. Tetracaine is found to be located in the lipid region with a preferential orientation of the molecular long axis parallel to the hydrocarbon chains. The orientation of procaine, mainly residing in the water region, is very small.






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Copyright © 1981 by the Biophysical Society.