Environmental scanning electron microscope imaging of vesicle systems.

Area of Science:

• Materials Science
• Biotechnology
• Nanotechnology

Background:

• Liposome morphology is well-understood through techniques like freeze-fracturing and electron microscopy.
• Conventional imaging often requires sample drying, staining, or fixation, not reflecting the natural hydrated state.

Purpose of the Study:

• To introduce Environmental Scanning Electron Microscopy (ESEM) as a method for imaging liposomes and niosomes in their native hydrated state.
• To dynamically observe hydration changes in lipid films and liposome suspensions in real-time.

Main Methods:

• Utilized Environmental Scanning Electron Microscopy (ESEM) for direct visualization of liposomes and niosomes.
• Monitored dynamic changes in liposome hydration as water content varied in real-time.

Main Results:

• ESEM enabled imaging of liposomes and niosomes without prior sample preparation (drying, staining, fixation).
• Real-time observation of hydration dynamics, including water condensation and evaporation, was achieved.
• Insights into liposome resistance to coalescence during dehydration were gained.

Conclusions:

• ESEM provides a powerful tool for studying liposomes and niosomes in their hydrated state.
• This technique offers a novel, dynamic assay for assessing liposome formulation and stability, particularly concerning dehydration resistance.