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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Generic phase behavior of branched-chain phospholipid monolayers.

Monolayers of chemically modified triple-chain phospholipids have been investigated at the air/water interface using pressure-area isotherms. The condensed phases of the lipids were characterized by grazing incidence X-ray diffraction (GIXD). Increasing chain length corresponds to a temperature effect, which was quantified for different lipids, depending on the head group structure using isotherm (two-dimensional systems) and DSC (three-dimensional systems) measurements. The combination of structure investigations revealed generic phase diagrams, which describe the phase behavior of multiple-chain lipids in two dimensions. For the 1-acyl-2-O-alkyl phospholipids, the generic phase diagram exhibits only L(2d), LS and LE phases while the exchange of the position of the branched acyl and the non-branched alkyl chains at the glycerol backbone leads to a much richer polymorphism (L(2h), L(2d), Ov, LS, S, tau, LE). Here we present the first experimental evidence of the unusual tau phase for multiple-chain lipid monolayers. This phase exhibits an undistorted in-plane lattice despite of tilted chains.[1]


  1. Generic phase behavior of branched-chain phospholipid monolayers. Bringezu, F., Dobner, B., Brezesinski, G. Chemistry (Weinheim an der Bergstrasse, Germany) (2002) [Pubmed]
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