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Related Experiment Videos

PEG Quantitation Using Reversed-Phase High-Performance Liquid Chromatography and Charged Aerosol Detection.

Mackensie C Smith1, Jeffrey D Clogston2

  • 1Cancer Research Technology Program, Nanotechnology Characterization Laboratory, Leidos Biomedical Research, Inc., Frederick National Laboratory for Cancer Research, P.O. Box B, Frederick, MD, 21702, USA.

Methods in Molecular Biology (Clifton, N.J.)
|October 18, 2017
PubMed
Summary

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Advancements in Nanoparticle Characterization.

Methods in molecular biology (Clifton, N.J.)·2024

Quantify polyethylene glycol (PEG) on gold nanoparticles using RP-HPLC. This method distinguishes bound and free PEG, crucial for nanoparticle performance and biocompatibility.

Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Polyethylene glycol (PEG)ylation is vital for nanoparticle efficacy, influencing biocompatibility and circulation.
  • Accurate quantitation of PEG, particularly distinguishing bound from free fractions, is essential for understanding nanoparticle behavior.
  • Current methods may not sufficiently differentiate PEG states, limiting precise characterization.

Purpose of the Study:

  • To present a robust method for quantifying polyethylene glycol (PEG) on colloidal gold nanoparticles.
  • To differentiate between bound and free PEG fractions post-PEGylation.
  • To enable accurate assessment of PEGylation impact on nanoparticle properties.

Main Methods:

  • Utilized reversed-phase high-performance liquid chromatography (RP-HPLC) coupled with charged aerosol detection (CAD).
Keywords:
Charged aerosol detectorDisplacementDissolutionGold nanoparticlesPolyethylene glycol (PEG)StabilitySurface characterization

Related Experiment Videos

  • Developed two approaches for PEG quantitation: KCN-mediated dissolution and DTT-mediated displacement of PEG.
  • Incorporated a centrifugation step to separate bound and free PEG fractions.

    • Main Results:

    • Successfully quantified total PEG and differentiated bound versus free PEG fractions.
    • Demonstrated the method's applicability to 30 nm colloidal gold nanoparticles with 20 kDa PEG.
    • Validated the quantitation accuracy through distinct PEG dissolution/displacement mechanisms.

    Conclusions:

    • The described RP-HPLC-CAD method provides accurate PEG quantitation on gold nanoparticles.
    • Distinguishing bound and free PEG is achievable, offering critical insights into nanoparticle functionality.
    • The method is adaptable to various nanoparticle sizes and PEG chain lengths.