Abstract

Various plant sterols have been tested for their ability to order soybean phosphatidylcholine bilayers as monitored by 2H-NMR spectroscopy. Sitosterol and 24ξ-methylpollinastanol, a 9β,19-cyclopropylsterol, appear to be the most effective sterols. The presence of either a trans-oriented double bond at C-22 in the C-24 alkylated sterol side chain or a Δ 8(9) in the tetracyclic ring system is shown to reduce significantly the ordering efficiency of the sterol molecule.

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