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Updated: Jul 15, 2026

Formulating and Characterizing Lipid Nanoparticles for Gene Delivery using a Microfluidic Mixing Platform
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Formulating and Characterizing Lipid Nanoparticles for Gene Delivery using a Microfluidic Mixing Platform

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Solid lipid nanoparticles: formulation factors affecting cell transfection capacity.

A del Pozo-Rodríguez1, D Delgado, M A Solinís

  • 1Pharmacy and Pharmaceutical Technology Laboratory, Pharmacy Faculty, University of the Basque Country (UPV-EHU), Paseo de la Universidad 7, 01006 Vitoria-Gasteiz, Spain.

International Journal of Pharmaceutics
|May 1, 2007
PubMed
Summary

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This study explores solid lipid nanoparticles (SLNs) for gene delivery, optimizing formulations with DOTAP and Tween 80. Optimal DOTAP/DNA ratios achieved significant transfection without compromising cell viability.

Area of Science:

  • Biotechnology
  • Nanomedicine
  • Gene Therapy

Background:

  • Solid lipid nanoparticles (SLNs) are emerging as non-viral vectors for gene delivery.
  • Limited research exists on SLN formulations for effective gene transfection.

Purpose of the Study:

  • To investigate the impact of formulation components on the in vitro transfection efficiency of SLN-DNA complexes.
  • To optimize SLN formulations for enhanced gene delivery using different DOTAP/DNA ratios.

Main Methods:

  • Formulation of SLN-DNA complexes using Precirol ATO 5, DOTAP, and Tween 80.
  • Characterization of nanoparticles for size, surface charge, and DNA protection.
  • In vitro assessment of transfection efficiency and cell viability in HEK293 cells.

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Last Updated: Jul 15, 2026

Formulating and Characterizing Lipid Nanoparticles for Gene Delivery using a Microfluidic Mixing Platform
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Published on: February 25, 2021

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Main Results:

  • Tween 80 incorporation reduced the required cationic lipid (DOTAP) concentration.
  • DOTAP/DNA ratios of 7/1, 5/1, and 4/1 yielded comparable transfection levels (~15% transfected cells).
  • Transfection efficiency correlated with DOTAP/DNA ratio, influencing DNA condensation within SLNs.

Conclusions:

  • Optimized SLN formulations demonstrate potential for gene delivery applications.
  • DNA condensation is a critical factor for SLN transfection capacity, impacting DNA delivery and protection.
  • Further research into SLN-DNA complex optimization can advance non-viral gene therapy strategies.