Systematic characterization of dmpc/dhpc self-assemblies and their phase behaviors in aqueous solution

Shogo Taguchi, Keishi Suga, Keita Hayashi, Yukihiro Okamoto, Ho Sup Jung, Hidemi Nakamura, Hiroshi Umakoshi

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Self-assemblies composed of 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) and 1,2-dihexanoyl-sn-glycero-3-phosphocholine (DHPC) form several kinds of structures, such as vesicle, micelle, and bicelle. Their morphological properties have been studied widely, but their interfacial membrane properties have not been adequately investigated. Herein, we report a systematic characterization of DMPC/DHPC assemblies at 20C. To investigate the phase behavior, optical density OD500, size (by dynamic light scattering), membrane fluidity 1/PDPH (using 1,6-diphenyl-1,3,5-hexatriene), and membrane polarity GP340 (using 6-dodecanoyl-N,N-dimethyl-2-naphthylamine) were measured as a function of molar ratio of DHPC (XDHPC). Based on structural properties (OD500 and size), large and small assemblies were categorized into Region (i) (XDHPC < 0.4) and Region (ii) (XDHPC ≥ 0.4), respectively. The DMPC/DHPC assemblies with 0.33 ≤ XDHPC ≤ 0.67 (Region (ii-1)) showed gel-phase-like interfacial membrane properties, whereas DHPC-rich assemblies (XDHPC ≥ 0.77) showed disordered membrane properties (Region (ii-2)). Considering the structural and interfacial membrane properties, the DMPC/DHPC assemblies in Regions (i), (ii-1), and (ii-2) can be determined to be vesicle, bicelle, and micelle, respectively.

Original languageEnglish
Article number73
JournalColloids and Interfaces
Volume2
Issue number4
DOIs
Publication statusPublished - 2018 Dec
Externally publishedYes

Keywords

  • Bicelle
  • Membrane fluidity
  • Membrane polarity
  • Phase behavior
  • Phospholipid assembly

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Colloid and Surface Chemistry

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