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Analysis of nanoparticle biomolecule complexes.

Stefán B Gunnarsson1, Katja Bernfur, Anders Mikkelsen

  • 1Department of Biochemistry and Structural Biology, Lund University, Box 124, 22100 Lund, Sweden.

Nanoscale
|February 14, 2018
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Summary
This summary is machine-generated.

Nanoparticles in biological fluids form complex biomolecular coronas, leading to aggregation and varied sizes. Separating these complexes reveals concentration-dependent differences in corona composition, crucial for accurate nanoparticle characterization.

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Area of Science:

  • Nanobiotechnology
  • Materials Science
  • Biochemistry

Background:

  • Nanoparticles in biological fluids adsorb biomolecules, forming a biomolecular corona.
  • This corona dictates nanoparticle interactions and biological impact.
  • Aggregation and broad size distribution are significant challenges in nanoparticle characterization.

Purpose of the Study:

  • To investigate nanoparticle aggregation and size distribution in biological fluids.
  • To characterize the biomolecular corona of separated nanoparticle complexes.
  • To highlight the need for advanced characterization methods.

Main Methods:

  • Preparative ultracentrifugation in a sucrose gradient to separate nanoparticle complexes.
  • Analysis of biomolecular corona composition in different size fractions.
  • Titanium dioxide (TiO2) nanoparticles in blood serum were studied.

Main Results:

  • Two distinct nanoparticle complex populations were isolated: fast-sedimenting (pellet) and slow-sedimenting (suspended).
  • Biomolecular corona composition varied between fractions, influenced by serum concentration and nanoparticle surface area.
  • Higher serum concentrations correlated with increased immunoglobulins, lipid-binding proteins, and lipid-rich complexes.

Conclusions:

  • Traditional descriptions of nanoparticles in biological fluids are oversimplified.
  • Sedimentation rate and biomolecular corona composition are critical factors for evaluating nanoparticle behavior.
  • Thorough characterization of nanoparticle-biomolecule complexes is essential for accurate nanobiotechnology applications.