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Related Experiment Video

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Phase Behavior of Charged Vesicles Under Symmetric and Asymmetric Solution Conditions Monitored with Fluorescence Microscopy

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Characterization of DODAB/DPPC vesicles.

Cecília N C Sobral¹, Marco A Soto, Ana M Carmona-Ribeiro

¹Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, P.O. Box 26077, 05513-970 São Paulo, SP, Brazil.

Chemistry and Physics of Lipids

|February 9, 2008

Summary

This summary is machine-generated.

Dioctadecyldimethylammonium bromide (DODAB)/dipalmitoylphosphatidylcholine (DPPC) cationic vesicles show optimal stability at 50% DODAB. This composite formulation enhances colloid stability across various salt concentrations, crucial for biotechnological applications.

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Published on: January 19, 2020

Area of Science:

Materials Science
Colloid and Surface Chemistry
Biotechnology

Background:

Dioctadecyldimethylammonium bromide (DODAB) and dipalmitoylphosphatidylcholine (DPPC) are key lipids for vesicle formulation.
Cationic vesicles are essential for various biotechnological applications.
Understanding lipid-bilayer interactions is crucial for vesicle stability.

Purpose of the Study:

To characterize DODAB/DPPC cationic vesicles.
To investigate the effect of DODAB concentration on vesicle phase behavior and colloid stability.
To assess the stability of composite vesicles in different salt concentrations.

Main Methods:

Vesicle preparation via vortexing lipid films.
Characterization techniques: phase behavior determination, size distribution analysis, zeta-potential measurement, and colloid stability assessment.
Evaluation of vesicle stability in varying NaCl concentrations (1, 50, 150mM).

Main Results:

Non-monotonic phase behavior observed with increasing DODAB percentage.
Maximum mean phase transition temperature and colloid stability achieved at 50% DODAB.
Remarkable colloid stability for 50% DODAB/DPPC vesicles in all tested NaCl concentrations, unlike pure DPPC or DODAB vesicles.
Vesicle size decreased with increasing DODAB, while zeta-potential remained constant due to reduced counterion binding.

Conclusions:

A strong correlation exists between bilayer structure stability and overall colloid stability.
The 50% DODAB/DPPC composite vesicles exhibit superior colloid stability compared to pure lipid vesicles.
The findings suggest potential for these stable cationic vesicles in diverse biotechnological applications.