Liposome fluidization and melting point depression by compressed and liquid n-alkanes

Geoffrey D. Bothun; Barbara L. Knutson; Herbert J. Strobel; Sue E. Nokes

doi:10.1016/j.colsurfa.2005.12.034

Liposome fluidization and melting point depression by compressed and liquid n-alkanes

Geoffrey D. Bothun, Barbara L. Knutson, Herbert J. Strobel, Sue E. Nokes

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

Fluidization and melting point depression of aqueous dipalmitoylphosphatidylcholine (DPPC, T_m ≈ 315 K) liposomes by compressed/supercritical n-alkanes (C₂ and C₃; 0.8-20.7 MPa) was quantified and compared to fluidization by liquid n-alkanes (C₅-C₁₀) using fluorescence anisotropy. The adsorption of ethane and propane into DPPC bilayers resulted in significant depression of the melting temperature (up to ΔT_m = -16.2 K at 7.0 MPa ethane and propane). Pressure-dependent fluidization by gaseous n-alkanes (1.8-20.7 MPa) and pressure-induced reversal of this fluidization was observed at temperatures corresponding to gel (295 K) and fluid (333 K) phases at atmospheric pressure. The ability to manipulate the degree of bilayer ordering, melting temperature, and width of the phase transition region is discussed in terms of the n-alkane concentration in the bilayer, effect of n-alkane molecular size, and van't Hoff enthalpy of the gel-fluid phase transition. The permeability, phase, and solvent properties of the bilayer can be altered with pressurized ethane or propane, which may provide enhanced control for liposome formation and processing.

Original language	English
Pages (from-to)	50-57
Number of pages	8
Journal	Colloids and Surfaces A: Physicochemical and Engineering Aspects
Volume	279
Issue number	1-3
DOIs	https://doi.org/10.1016/j.colsurfa.2005.12.034
State	Published - May 15 2006

Bibliographical note

Funding Information:
The authors gratefully acknowledge the financial support of the National Science Foundation (Grant BES-9817069) and Dr. Mark Meier in the Department of Chemistry at the University of Kentucky for his assistance in calculating the elliptical n -alkane molecular surface area ( A e ).

Keywords

Cell membrane
Compressed solvent
DPPC
Lipid bilayer
Liposome
Supercritical fluid

ASJC Scopus subject areas

Surfaces and Interfaces
Physical and Theoretical Chemistry
Colloid and Surface Chemistry

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10.1016/j.colsurfa.2005.12.034

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title = "Liposome fluidization and melting point depression by compressed and liquid n-alkanes",

abstract = "Fluidization and melting point depression of aqueous dipalmitoylphosphatidylcholine (DPPC, Tm ≈ 315 K) liposomes by compressed/supercritical n-alkanes (C2 and C3; 0.8-20.7 MPa) was quantified and compared to fluidization by liquid n-alkanes (C5-C10) using fluorescence anisotropy. The adsorption of ethane and propane into DPPC bilayers resulted in significant depression of the melting temperature (up to ΔTm = -16.2 K at 7.0 MPa ethane and propane). Pressure-dependent fluidization by gaseous n-alkanes (1.8-20.7 MPa) and pressure-induced reversal of this fluidization was observed at temperatures corresponding to gel (295 K) and fluid (333 K) phases at atmospheric pressure. The ability to manipulate the degree of bilayer ordering, melting temperature, and width of the phase transition region is discussed in terms of the n-alkane concentration in the bilayer, effect of n-alkane molecular size, and van't Hoff enthalpy of the gel-fluid phase transition. The permeability, phase, and solvent properties of the bilayer can be altered with pressurized ethane or propane, which may provide enhanced control for liposome formation and processing.",

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AU - Bothun, Geoffrey D.

AU - Knutson, Barbara L.

AU - Strobel, Herbert J.

AU - Nokes, Sue E.

PY - 2006/5/15

Y1 - 2006/5/15

N2 - Fluidization and melting point depression of aqueous dipalmitoylphosphatidylcholine (DPPC, Tm ≈ 315 K) liposomes by compressed/supercritical n-alkanes (C2 and C3; 0.8-20.7 MPa) was quantified and compared to fluidization by liquid n-alkanes (C5-C10) using fluorescence anisotropy. The adsorption of ethane and propane into DPPC bilayers resulted in significant depression of the melting temperature (up to ΔTm = -16.2 K at 7.0 MPa ethane and propane). Pressure-dependent fluidization by gaseous n-alkanes (1.8-20.7 MPa) and pressure-induced reversal of this fluidization was observed at temperatures corresponding to gel (295 K) and fluid (333 K) phases at atmospheric pressure. The ability to manipulate the degree of bilayer ordering, melting temperature, and width of the phase transition region is discussed in terms of the n-alkane concentration in the bilayer, effect of n-alkane molecular size, and van't Hoff enthalpy of the gel-fluid phase transition. The permeability, phase, and solvent properties of the bilayer can be altered with pressurized ethane or propane, which may provide enhanced control for liposome formation and processing.

AB - Fluidization and melting point depression of aqueous dipalmitoylphosphatidylcholine (DPPC, Tm ≈ 315 K) liposomes by compressed/supercritical n-alkanes (C2 and C3; 0.8-20.7 MPa) was quantified and compared to fluidization by liquid n-alkanes (C5-C10) using fluorescence anisotropy. The adsorption of ethane and propane into DPPC bilayers resulted in significant depression of the melting temperature (up to ΔTm = -16.2 K at 7.0 MPa ethane and propane). Pressure-dependent fluidization by gaseous n-alkanes (1.8-20.7 MPa) and pressure-induced reversal of this fluidization was observed at temperatures corresponding to gel (295 K) and fluid (333 K) phases at atmospheric pressure. The ability to manipulate the degree of bilayer ordering, melting temperature, and width of the phase transition region is discussed in terms of the n-alkane concentration in the bilayer, effect of n-alkane molecular size, and van't Hoff enthalpy of the gel-fluid phase transition. The permeability, phase, and solvent properties of the bilayer can be altered with pressurized ethane or propane, which may provide enhanced control for liposome formation and processing.

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KW - DPPC

KW - Lipid bilayer

KW - Liposome

KW - Supercritical fluid

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Liposome fluidization and melting point depression by compressed and liquid n-alkanes

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Bibliographical note

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