Imaging phospholipid conformational disorder and packing in giant multilamellar liposome by confocal Raman microspectroscopy

Hemanth Noothalapati, Keita Iwasaki, Chikako Yoshimoto, Keisuke Yoshikiyo, Tomoe Nishikawa, Masahiro Ando, Hiro o. Hamaguchi, Tatsuyuki Yamamoto

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Liposomes are closed phospholipid bilayer systems that have profound applications in fundamental cell biology, pharmaceutics and medicine. Depending on the composition (pure or mixture of phospholipids, presence of cholesterol) and preparation protocol, intra- and inter-chain molecular interactions vary leading to changes in the quality (order and packing) of liposomes. So far it is not possible to image conformational disorders and packing densities within a liposome in a straightforward manner. In this study, we utilized confocal Raman microspectroscopy to visualize structural disorders and packing efficiency within a giant multilamellar liposome model by focusing mainly on three regions in the vibrational spectrum (C[sbnd]C stretching, C[sbnd]H deformation and C[sbnd]H stretching). We estimated properties such as trans/gauche isomers and lateral packing probability. Interestingly, our Raman imaging studies revealed gel phase rich domains and heterogeneous lateral packing within the giant multilamellar liposome.

Original languageEnglish
Pages (from-to)186-190
Number of pages5
JournalSpectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
Volume187
DOIs
Publication statusPublished - 2017 Dec 5

Keywords

  • Conformational disorder
  • Giant liposomes
  • Liposome imaging
  • Multilamellar liposomes
  • Packing efficiency
  • Raman spectroscopy

ASJC Scopus subject areas

  • Analytical Chemistry
  • Atomic and Molecular Physics, and Optics
  • Instrumentation
  • Spectroscopy

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