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Biophys J, November 2002, p. 2702-2704, Vol. 83, No. 5
*Department of Biophysical Chemistry, Umeå University, SE-901 87 Umeå, Sweden; Department of Biochemistry and Molecular
Pathology, Northeastern Ohio Universities' College of Medicine,
Rootstown, Ohio 44272 USA
The pulsed field gradient NMR method for measuring
self-diffusion has been used for a direct determination of the lateral diffusion coefficient of cholesterol, fluorine labeled at the 6-position, for an oriented lamellar liquid-crystalline phase of
dimyristoylphosphatidylcholine (DMPC)/cholesterol/water. It is found
that the diffusion coefficients of DMPC and cholesterol are equal over
a large temperature interval. The apparent energy of activation for the
diffusion process (58 kJ/mol) is about the same as for a lamellar phase
of DMPC/water, whereas the phospholipid lateral diffusion coefficient
is approximately four times smaller in the presence of cholesterol.
Biophys J, November 2002, p. 2702-2704, Vol. 83, No. 5
© 2002 by the Biophysical Society 0006-3495/02/11/2702/03 $2.00
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