In summary, our 2 H NMR measurements show that nalkanes crystallize inside lipid membranes only if the n-alkane melting point lies sufficiently far above the main transition temperature of the lipid membranes. If the temperature difference between the two transitions is too small, upon cooling the n-alkane molecules become trapped in the lipid gel phase and do not crystallize. We observe this at very low cooling rates since the 2 H NMR experiments performed at each temperature had a duration of 1 hour or more. These results suggest that the crystallization temperature of n-alkanes is decreased inside a lipid membrane environment similarly to what happens when chains are dispersed in a non-structured solvent. In order to investigate this in more detail, we performed 1 H NMR and DSC experiments on the system C30/DMPC which are evaluated in the following section.