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Related Concept Videos

Atomic Force Microscopy01:08

Atomic Force Microscopy

3.5K
Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...
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Updated: Aug 10, 2025

Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers
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Visualization and Characterization of Liposomes by Atomic Force Microscopy.

Konrad Engelhardt1, Eduard Preis1, Udo Bakowsky2

  • 1Department of Pharmaceutics and Biopharmaceutics, University of Marburg, Marburg, Germany.

Methods in Molecular Biology (Clifton, N.J.)
|February 13, 2023
PubMed
Summary

Atomic force microscopy (AFM) visualizes nanometer-sized liposomes for pharmaceutical research. This study details AFM methods for characterizing liposomes, focusing on sample preparation and data processing for high-quality imaging.

Keywords:
Atomic force microscope (AFM)CantileverDrug delivery systemsGene vehicleLiposomesNanotechnologyRoughnessScanning artifactsSilicon waferVesicles

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Pharmaceutical Sciences

Background:

  • Atomic force microscopy (AFM) is a key technique for high-resolution imaging of nanoscale biological samples.
  • Liposomes are crucial drug delivery systems, necessitating precise characterization of their size, morphology, and material properties.
  • AFM offers non-optical visualization of topography, morphology, and mechanical properties, vital for pharmaceutical R&D and QC.

Purpose of the Study:

  • To visualize and characterize empty and drug-loaded liposomes using advanced AFM.
  • To investigate the impact of varying lipid compositions and sizes (50-800 nm) on liposome morphology and properties.
  • To optimize AFM sample preparation, instrumental settings, and data processing for reliable liposome characterization.

Main Methods:

  • Utilized state-of-the-art atomic force microscopy for imaging liposomes.
  • Employed intermittent contact (AC mode) to acquire height, amplitude, and phase data.
  • Focused on meticulous sample preparation techniques and optimized instrumental parameters.

Main Results:

  • Successfully visualized and characterized liposomes of diverse lipid compositions and sizes.
  • Generated detailed topographical and morphological data of liposomes.
  • Identified critical parameters in sample preparation and imaging for troubleshooting.

Conclusions:

  • AFM is a powerful tool for detailed characterization of liposomes in pharmaceutical applications.
  • Careful attention to sample preparation, instrumental settings, and data processing is essential for high-quality AFM results.
  • This study provides a framework for effective AFM utilization in liposome-based drug delivery research.