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This study investigated the blood compatibility of temperature-responsive nanogels with varying charges. Embedding charges in the core, protected by neutral shells, allows tuning of hemocompatibility for drug delivery systems.

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Polymer Chemistry

Background:

  • Nanogels are smart nanomaterials for drug delivery.
  • Limited data exists on nanogel hemocompatibility, especially regarding charge effects.
  • Systematic studies are needed to understand charge impact on nanogel blood compatibility.

Purpose of the Study:

  • To synthesize and evaluate the blood compatibility of temperature-responsive, galactose-based nanogels.
  • To investigate the influence of net positive, negative, or neutral charges in the core or shell on hemocompatibility.
  • To establish a structure-activity relationship for nanogel blood compatibility.

Main Methods:

  • Reversible addition-fragmentation chain transfer (RAFT) polymerization was used to create nanogels.
  • Nanogels with varied core/shell charge (neutral, cationic, anionic) were synthesized.
  • Hemocompatibility was assessed via complement activation, clotting, platelet activation, RBC aggregation, and hemolysis.

Main Results:

  • Nanogel properties and blood compatibility were tunable based on charge placement.
  • Embedding charges within the core, shielded by neutral shells, improved hemocompatibility.
  • Specific charge configurations demonstrated distinct effects on blood component interactions.

Conclusions:

  • Charge placement significantly impacts nanogel hemocompatibility.
  • Neutral carbohydrate shells effectively protect the core, modulating blood interactions.
  • Core-charge engineering offers a strategy for developing safer nanocarriers for systemic delivery.