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                <term xml:lang="en">microscopie à force atomique</term>
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                <term xml:lang="en">cholesterol</term>
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                <term xml:lang="en">digestion</term>
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              <p>Milk sphingomyelin (MSM) and cholesterol segregate into domains in the outer bilayer membrane surroundingmilk fat globules. To elucidate the morphology and mechanical properties of theses domains, supported lipid bilayers with controlled molar proportions of MSM, dioleoylphosphatidylcholine (DOPC) and cholesterol were produced in buffer mimicking conditions of the milk aqueous phase. Atomic force microscopy imaging showed that (i) for T &lt;35 ° C MSM segregated in gel phase domains protruding above the fluid phase, (ii) the addition of 20 mol % cholesterol resulted in smaller and more elongated lophase domains than in equimolar MSM/DOPC membranes, (iii) the MSM/cholesterol-enrichedl o phase domains were less salient than the MSM gel phase domains. Force spectroscopy measurements furthermore showed that cholesterol reduced the resistance of MSM/DOPC membrane to perforation. The results are discussed with respect to the effect of cholesterol on thebiophysical properties of lipid membranes. The combination of AFM imaging and force mapping provides unprecedented insight into the structural and mechanical properties of milk lipid membranes, and opens perspectives for investigation of the functional properties of MSM domains during milk fat processing or digestion</p>
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