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Letter

Localization of Dibromophenol in DPPC/Water Liposomes Studied by Anomalous Small-Angle X-ray Scattering

Zoltán Varga,^† Attila Bóta,*^† and Günter Goerigk^‡

Institute of Physical Chemistry, Budapest University of Technology and Economics, Megyetem rkp 3, H-1521 Budapest, Hungary, and Institute of Solid State Physics, Research Centre Jlich, D-52425 Jlich, Germany

J. Phys. Chem. B, 2006, 110 (23), pp 11029–11032

DOI: 10.1021/jp061750j

Publication Date (Web): May 20, 2006

†

Budapest University of Technology and Economics.

To whom correspondence may be addressed. Tel.: +36 1 463 2473. Fax: +36 1 463 3767. E-mail: abota@mail.bme.hu.

‡

Research Centre Jülich.

Abstract

The localization of 2,4-dibromophenol molecules along the bilayer normal was investigated by anomalous small-angle X-ray scattering (ASAXS) with synchrotron radiation. The ASAXS measurements, executed at three different energies, provide the separation of the scattering of the bromine atoms of dibromophenol molecules from that of the whole system. Using a full q-range model, the localization of the dibromophenol molecules was characterized at a lower (0.1) and a higher (1) dibromophenol/lipid molar ratio corresponding to the gel and to the interdigitated phases of the vesicle matrix, respectively.

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