TRIBE. Can. J. Chem. 57, 458 (1979).Phospholipid bilayers containing branched chain molecules, phytol (I), vitamin E (2), and phytanic acid (3), have been investigated by 3'P nmr, esr, and differential scanning calorimetry (dsc).A 31P lanthanide induced shift study indicated varying permeabilities to Pr3+ in the order phytanic acid > vitamin E > phytol > egg yolk lecithin alone; the half-lives (in days) were 0.002,0.14, 0.83, and 6.5, respectively. The activation energy for Pr3+ permeation through the egg yolk lecithin -phytol membrane was found to be 84.9 + 0.8 kJ.The following esr order parameters, S3, were obtained using the extrinsic spin label, 5-doxylpalmitic acid, in oriented mixed multibilayers: S3 (1) Faisant appel la rmn du 31P, h la rpe et a I'analyse enthalpique differentiel (aed), on a etudie des doubles couches de phospholipides contenant des molkules a chaines ramifiees comme le phytol (I), la vitamine E (2) et I'acide phytanique (3).Une etude de deplacements induits par les lanthanides des spectres rmn du 31P met en relief que les diverses permeabilites au Pr3+ sont dans I'ordre acide phytanique > vitamine E > phytol > EYL (seui); les demi-vies respectives (en jours) sont 0.002,0.14,0.83 et 6.5. L'energie d'activation pour l'impregnation du Pr3+ a travers une membrane de EYL-phytol est egale a 84.9 + 0.8 kJ.Dans des couches multiples mixtes orientkes, les paramttres d'ordre S3, mesuds en rpe en faisant appel a I'acide doxyl-5 palmitique, un marqueur de spin intrinskque, sont les suivants:S3 (1)
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