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Related Concept Videos

Membrane Fluidity01:23

Membrane Fluidity

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Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.
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Related Experiment Video

Updated: Aug 10, 2025

Fluorescence-Based Measurements of Phosphatidylserine/Phosphatidylinositol 4-Phosphate Exchange Between Membranes
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DPH Probe Method for Liposome-Membrane Fluidity Determination.

Wei He1

  • 1School of Pharmacy, China Pharmaceutical University, Nanjing, China. weihe@cpu.edu.cn.

Methods in Molecular Biology (Clifton, N.J.)
|February 13, 2023
PubMed
Summary
This summary is machine-generated.

Liposome membranes can become unstable due to ion deposition. This study describes using the fluorescent probe 1,6-diphenyl-1,3,5-hexatriene (DPH) to measure liposome membrane fluidity and assess stability.

Keywords:
1,6-diphenyl-1,3,5-hexatrieneFluidityFluorescence anisotropyLiposome

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Area of Science:

  • Biochemistry
  • Materials Science
  • Physical Chemistry

Background:

  • Liposomes are vesicle structures with phospholipid bilayers.
  • Continuous phospholipid exchange leads to ion accumulation and membrane instability.
  • Reliable methods are needed to evaluate liposome stability.

Purpose of the Study:

  • To describe a method for determining liposome membrane fluidity.
  • To utilize 1,6-diphenyl-1,3,5-hexatriene (DPH) as a fluorescent probe for this purpose.

Main Methods:

  • Employing 1,6-diphenyl-1,3,5-hexatriene (DPH) as a fluorescent probe.
  • Measuring DPH fluorescence anisotropy to infer membrane fluidity.
  • Relating DPH anisotropy to liposome membrane stability.

Main Results:

  • DPH fluorescence anisotropy is inversely correlated with membrane fluidity.
  • Higher DPH anisotropy indicates lower membrane fluidity.
  • This method provides a means to assess liposome stability.

Conclusions:

  • The DPH method is effective for determining liposome membrane fluidity.
  • This technique aids in evaluating the stability of liposomes.
  • Understanding membrane fluidity is crucial for liposome applications.