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Please use this identifier to cite or link to this item: http://apo.ansto.gov.au/dspace/handle/10238/7984

Title: Stereoselective synthesis of perdeuterated phytanic acid, its phospholipid derivatives and their formation into lipid model membranes for neutron reflectivity studies.
Authors: Yepuri, NR
Holt, SA
Moraes, G
Holden, P
Hossain, KR
Valenzuela, SM
Darwish, TA
James, M
Keywords: DEUTERATION
LIPIDS
MEMBRANES
SYNTHESIS
PHOSPHOLIPIDS
STEREOCHEMISTRY
Issue Date: 1-Oct-2014
Publisher: Elsevier
Citation: Yepuri, N. R., Holt, S. A., Moraes, G., Holden, P. J., Hossain, K. R., Valenzuela, S. M., . . . Darwish, T. A. (2014). Stereoselective synthesis of perdeuterated phytanic acid, its phospholipid derivatives and their formation into lipid model membranes for neutron reflectivity studies. Chemistry and Physics of Lipids, 183(0), 22-33. doi: http://dx.doi.org/10.1016/j.chemphyslip.2014.04.004
Abstract: We describe a straightforward method, for synthesis of large scale (gram quantities) of highly deuterated phytanic acid from commercially available phytol while preserving the stereochemistry around the chiral centres. The subsequent synthesis of tail-deuterated analogues of the archeabacterial membrane lipids 1,2-di(3RS,7R,11R-phytanyl)-sn-glycero-3-phosphocholine (DPEPC) and 1,2-di(3RS,7R,11R-phytanoyl)-sn-glycero-3-phosphocholine (DPhyPC) from perdeuterated phytanic acid is also described. Both lipids were employed in construction of two different model membranes, namely Langmuir monolayers and a tethered bilayer membrane (TBM) on a solid substrate, characterised by pressure area isotherm and neutron reflectometry techniques. At 10 mN/m pressure the head-group thickness of both monolayers was similar while the thickness of the tail region was significantly larger for tail-deuterated DPhyPC, which was evident from a smaller area per molecule. At 20 mN/m the thickness of the head and tail regions in both lipids was comparable, yet the area per molecule of tail-deuterated DPhyPC was 10% smaller than tail-deuterated DPEPC. In the TBM bilayer model membrane, the thickness of the lipid tails in both inner and outer leaflets was 8.2 Å, giving a total of 16.4 Å. Deuteration enabled unambiguous determination of the relative proportion of the hydrogenous tether, phospholipid and subphase. © 2014, Elsevier Ireland Ltd.
URI: http://dx.doi.org/10.1016/j.chemphyslip.2014.04.004
http://apo.ansto.gov.au/dspace/handle/10238/7984
ISSN: 0009-3084
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