Reverse vesicle formation from the yeast glycolipid biosurfactant mannosylerythritol lipid-D

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  • Fukuoka Tokuma
    Research Institute for Innovation in Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST)
  • Yanagihara Takashi
    Faculty of Science and Technology, Tokyo University of Science
  • Ito Seya
    Faculty of Science and Technology, Tokyo University of Science
  • Imura Tomohiro
    Research Institute for Innovation in Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST)
  • Morita Tomotake
    Research Institute for Innovation in Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST)
  • Sakai Hideki
    Faculty of Science and Technology, Tokyo University of Science
  • Abe Masahiko
    Faculty of Science and Technology, Tokyo University of Science
  • Kitamoto Dai
    Research Institute for Innovation in Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST)

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Mannosylerythritol lipids (MELs) are secreted by yeasts and are promising glycolipid biosurfactants. In our study on the non-aqueous phase behaviors of MEL homologues, we found that MEL-D (4-O-[2’,3’-di-O-alka(e)noyl-β-D-mannopyranosyl]-(2R,3S)-erythritol) forms aggregates in decane. The microscopic observation and the X-ray scattering measurement of these aggregates revealed that they are reverse vesicles that consist of bilayers whose hydrophilic domains are located in the interior of the bilayers. In addition, MEL-D formed reverse vesicles without co-surfactants and co-solvents in various oily solutions, such as n-alkanes, cyclohexane, squalane, squalene, and silicone oils at a concentration below 10 mM. This is the first report on the reverse vesicle formation from biosurfactants.

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