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Related Experiment Video

Updated: Jan 19, 2026

Assembly and Characterization of Polyelectrolyte Complex Micelles
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Kinetic Control in Assembly of Plasmid DNA/Polycation Complex Nanoparticles.

Yizong Hu, Zhiyu He, Yue Hao

  • 1Cancer Targeting Systems , Chesterford Research Park , Cambridge , CB10 1XL , U.K.

ACS Nano
|September 11, 2019
PubMed
Summary

Flash nanocomplexation (FNC) enables precise control over plasmid DNA (pDNA) and polyethylenimine (lPEI) nanoparticle assembly for gene therapy. This method produces uniform, scalable nanoparticles with tunable pDNA payload, improving transfection efficiency and reducing toxicity.

Keywords:
DNA/polycation nanoparticlegene deliverykinetic controllinear polyethyleniminepolyelectrolyte complextransfectionturbulent mixing

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Gene Therapy Delivery

Background:

  • Polyelectrolyte complex (PEC) nanoparticles, formed from plasmid DNA (pDNA) and polycations like linear polyethylenimine (lPEI), are key nonviral gene therapy vectors.
  • Current methods for controlling nanoparticle properties focus on polycation structure and assembly conditions, but reproducible production requires control over assembly kinetics.

Purpose of the Study:

  • To develop a kinetically controlled method for assembling pDNA/lPEI nanoparticles with tunable size, composition, and pDNA payload.
  • To demonstrate the scalability and reproducibility of this novel assembly process.

Main Methods:

  • Flash nanocomplexation (FNC), a microfluidic technique, was used to rapidly mix pDNA and lPEI solutions, controlling polyelectrolyte complex assembly kinetics.
  • A combined experimental and simulation approach was employed to characterize the resulting nanoparticles.

Main Results:

  • FNC enabled precise control over nanoparticle size (35-130 nm) and pDNA payload (1.3-21.8 copies per nanoparticle).
  • Nanoparticles produced via FNC showed improved uniformity and scalability compared to bulk mixing methods.
  • The study demonstrated a correlation between pDNA payload, formulation composition, and *in vivo* transfection efficiency and toxicity.
  • The nanoparticles exhibited excellent long-term stability in a lyophilized formulation for at least 9 months at -20 °C.

Conclusions:

  • Flash nanocomplexation offers a robust and scalable method for producing well-defined pDNA/lPEI nanoparticles for gene medicine.
  • This approach facilitates the development of off-the-shelf gene therapy products with predictable performance.