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Related Concept Videos

Modified-Release Drug Delivery Systems: Site-Targeted01:24

Modified-Release Drug Delivery Systems: Site-Targeted

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Site-targeted drug delivery systems enhance therapeutic efficacy while minimizing systemic toxicity and treatment costs. Unlike conventional methods, these systems ensure precise drug delivery, improving bioavailability and reducing side effects. Targeted drug delivery is classified into three levels. First-order targeting directs drugs to the capillary beds of specific organs or tissues. Second-order targets specific cell types, such as tumor cells, using receptor-mediated interactions.
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After oral administration, poor permeability often limits the rate at which drugs are absorbed through the intestinal epithelium. Enhancing drug permeability is crucial for effective therapy, and several strategies have been developed to overcome this challenge.One effective strategy involves the use of lipid-based formulations. These formulations enhance dissolution and solubility, targeting physiological mechanisms to increase drug absorption. This includes stimulating bile salt secretion,...
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Related Experiment Video

Updated: May 2, 2026

Preparation and Characterization of Nanoliposomes for the Entrapment of Bioactive Hydrophilic Globular Proteins
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Liposome and protein based stealth nanoparticles.

Eugénia Nogueira, Ana Loureiro, Patrícia Nogueira

    Faraday Discussions
    |March 12, 2014
    PubMed
    Summary

    Researchers developed stealth nanoparticles using polyethylene glycol (PEG) and monosialoganglioside (GM1) coatings to reduce macrophage clearance for improved drug delivery systems.

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    Area of Science:

    • Nanotechnology
    • Materials Science
    • Biomedical Engineering

    Background:

    • Nanoparticles are promising for drug delivery but often face rapid clearance by macrophages.
    • Surface modification is crucial for enhancing nanoparticle circulation time and efficacy.
    • Stealth properties are essential for successful systemic nanoparticle-based therapies.

    Purpose of the Study:

    • To engineer liposomes and protein-based nanoparticles with enhanced stealth characteristics.
    • To evaluate the impact of surface modifications on nanoparticle interaction with macrophages.
    • To assess the potential of these modified nanoparticles for systemic drug delivery.

    Main Methods:

    • Liposomes were coated with polyethylene glycol (PEG) and monosialoganglioside (GM1).
    • Bovine serum albumin (BSA) nanoparticles were prepared with a PEGylated surfactant.
    • Nanoparticle size, zeta-potential, and macrophage internalization were analyzed.

    Main Results:

    • All nanoparticles exhibited monodispersity (80-120 nm) and near-zero zeta-potential.
    • Surface modifications significantly reduced nanoparticle uptake by macrophages.
    • The stealth strategies effectively decreased macrophage clearance.

    Conclusions:

    • Surface-modified liposomes and BSA nanoparticles demonstrate improved stealth properties.
    • These nanoparticles show potential for developing advanced drug delivery nanosystems.
    • The findings support the use of these stealth nanoparticles for intravenous administration.