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Impact of free hydroxylated and methyl-branched fatty acids on the organization of lipid membranes
Umeå University, Faculty of Science and Technology, Chemistry.
Umeå University, Faculty of Science and Technology, Chemistry.
2008 (English)In: Chemistry and Physics of Lipids, Vol. 154, no 1, 26-32 p.Article in journal (Refereed) Published
Abstract [en]

Differential scanning calorimetry (DSC) has been applied to study the effect of free hydroxylated and methyl-branched fatty acids on the physico-chemical properties of lipid membranes. First, the impact of free hydroxy fatty acids (HFAs) on dimyristoylphosphatidylcholine (DMPC) model membranes was monitored only as a function of chain length and position of the attached hydroxyl group. Second, racemic vs. enantiopure anteiso fatty acids (AFAs) and HFAs were investigated to address the question of which role does a fatty acid's chirality play on its membrane pertubing effect.

The DSC thermograms revealed that the main gel to liquid–crystalline phase transition of the DMPC bilayers which results in a disordering effect of the lipid hydrocarbon chains was affected in different ways depending on the nature of the incorporated fatty acid. Long-chain 2- and 3-HFAs stabilized the gel phase by reducing the phase transition temperature (Tm), whereas short-chain HFAs and long-chain HFAs with the hydroxy group remote from the head group stabilized the more disordered liquid–crystalline state. Additionally, we observed that enantiopure (S)-14-methylhexadecanoic acid ((S)-a17:0) and (R)-2-hydroxy octadecanoic acid and the corresponding racemates had contrary effects upon incorporation into DMPC bilayers. In both cases, the pure enantiomers alleviated the liquid–crystalline state of the biological model membrane.

Place, publisher, year, edition, pages
2008. Vol. 154, no 1, 26-32 p.
Keyword [en]
Differential scanning calorimetry, Phase transition, Anteiso fatty acids, Hydroxy fatty acids, Chirality
Identifiers
URN: urn:nbn:se:umu:diva-9506DOI: doi:10.1016/j.chemphyslip.2008.03.010OAI: oai:DiVA.org:umu-9506DiVA: diva2:149177
Available from: 2008-06-24 Created: 2008-06-24 Last updated: 2011-01-10Bibliographically approved

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CiteExportLink to record
Permanent link

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Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
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Language
  • de-DE
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  • en-US
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  • nn-NO
  • nn-NB
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Output format
  • html
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  • asciidoc
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