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Water gradient in the membrane-water interface: a time-resolved study of the series of n-(9-anthroyloxy) stearic acids incorporated in AOT/water/iso-octane reverse micelles.

The journal of physical chemistry. B (2012-01-12)
Michel Vincent, Jacques Gallay
ABSTRACT

The water radial distribution in AOT/iso-octane/water reverse micelles (RM), used to mimic the membrane-water interface, was examined by excited-state lifetime and transient spectral measurements of the series of n-(9-anthroyloxy) stearic acids (n-AS), with n = 2, 3, 6, 7, 9, 10, and 12. A water gradient in the RM extended from the polar head group region up to the middle of the surfactant carbon chains. A fast intramolecular excited-state relaxation, involving the rotation of the carboxylic group of the ester bond with respect to the anthracene ring, gave rise to a nanosecond time-dependent fluorescence Stokes shifts (TDFSS). In water-filled RMs, we only observed a water-induced TDFSS occurring over subnano- and nanosecond time scales with decreasing amplitudes and rates as a function of depth, according to the decreasing water gradient and the slowing down of the anthroyloxy moiety rotational motion. This water-induced TDFSS is most likely the result of both H-bond formation and general dipolar relaxation, as indirectly showed by measurements with DMF (a nonprotic polar solvent) instead of water in RMs.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Octane, anhydrous, ≥99%
Sigma-Aldrich
Octane, reagent grade, 98%
Supelco
Octane, analytical standard
Sigma-Aldrich
Octane, puriss. p.a., ≥99.0% (GC)
Sigma-Aldrich
Octane, electronic grade, ≥99.999% metals basis, ≥99% (CP)

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