Related Experiment Video
Updated: Jul 3, 2026
13:39
Optical Trapping of Nanoparticles
Published on: January 15, 2013
22.3K
Depolarized Forward Light Scattering for Subnanometer Precision in Biomolecular Layer Analysis on Gold Nanorods
Peter Johansson1, Mikael Käll2, Hana Šípová-Jungová2
1School of Science and Technology, Örebro University, 701 82 Örebro, Sweden.
The Journal of Physical Chemistry Letters
|January 27, 2025
Summary
A new light scattering method tracks how biomolecules attach to gold nanoparticles in real-time. This technique is crucial for optimizing nanoparticle drug delivery and biosensing applications.
Area of Science:
- Nanomedicine
- Biomaterials Science
- Physical Chemistry
Background:
- Functional gold nanoparticles are vital for drug delivery, imaging, and biosensing.
- Nanoparticle performance in vivo depends on interactions with biological molecules and acquired biomolecular layers.
- Real-time tracking of biomolecular attachment to nanoparticles is experimentally difficult.
Purpose of the Study:
- To develop a method for real-time tracking of biomolecular interactions with nanoparticles.
- To characterize nanoparticle functional coatings and biomolecular binding kinetics.
- To determine protein adsorption affinity constants for gold nanoparticles.
Main Methods:
- Utilized a depolarized forward light scattering (DFLS) technique.
- Analyzed rotational relaxation constants of optically anisotropic nanoparticles.
- Measured forward light scattering in a cross-polarized configuration after illumination with linearly polarized light.
Main Results:
- Demonstrated DFLS for characterizing functional coatings on gold nanoparticles.
- Successfully analyzed biomolecular binding kinetics to gold nanoparticles.
- Determined specific protein adsorption affinity constants.
Conclusions:
- DFLS provides a powerful method for studying nanoparticle-biomolecule interactions in complex biological environments.
- This technique can advance nanomedicine and optimize nanoparticle-based drug delivery systems.
- Real-time monitoring of biomolecular attachment is now feasible for improved nanoparticle design.
Related Concept Videos
01:08Atomic Force Microscopy
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...
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...
01:25Overview of Electron Microscopy
The wavelengths of visible light ultimately limit the maximum theoretical resolution of images created by light microscopes. Most light microscopes can only magnify 1000X, and a few can magnify up to 1500X. Electrons, like electromagnetic radiation, can behave like waves, but with wavelengths of 0.005 nm, they produce significantly greater resolution up to 0.05 nm as compared to 500 nm for visible light. An electron microscope (EM) can create a sharp image that is magnified up to 2,000,000X.