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Polyaspartamide Functionalized Catechol-Based Hydrogels Embedded with Silver Nanoparticles for Antimicrobial

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This study synthesized polyaspartamide hydrogels with silver nanoparticles (AgNPs) for controlled release and antibacterial applications. The materials showed effective bacteriostatic and bactericidal properties against common bacteria.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biomedical Engineering

Background:

  • Polyaspartamide hydrogels offer versatile platforms for drug delivery and tissue engineering.
  • Silver nanoparticles (AgNPs) possess potent antimicrobial properties.
  • Developing efficient methods for AgNP synthesis and controlled release is crucial for biomedical applications.

Purpose of the Study:

  • To synthesize polyaspartamide-based hydrogels incorporating silver nanoparticles (AgNPs).
  • To investigate the role of hydrogels as templates for AgNP synthesis and dispersion.
  • To evaluate the antimicrobial efficacy and release kinetics of the developed AgNP-hydrogel composites.

Main Methods:

  • Hydrogel synthesis via boron-catechol coordination.
  • In-situ AgNP formation using free catechol moieties within the hydrogel.
  • Transmission Electron Microscopy (TEM) for AgNP size and aggregation analysis.
  • X-ray Diffraction (XRD) for particle size confirmation (Scherrer equation).
  • In vitro release studies in Dulbecco's Modified Eagle Medium (DMEM).
  • Minimum Inhibitory Concentration (MIC) and Minimum Bactericidal Concentration (MBC) assays.

Main Results:

  • TEM confirmed AgNPs < 20 nm with minimal aggregation, indicating hydrogel templating efficiency.
  • XRD analysis corroborated the mean particle size.
  • Slow and sustained release of AgNPs was observed over an extended period in DMEM.
  • Significant bacteriostatic and bactericidal effects were demonstrated against *Staphylococcus aureus* (Gram-positive) and *Escherichia coli* (Gram-negative).

Conclusions:

  • Polyaspartamide hydrogels effectively template the synthesis of well-dispersed AgNPs.
  • The AgNP-hydrogel composites exhibit promising slow-release kinetics.
  • These materials demonstrate potent broad-spectrum antibacterial activity, suggesting potential in antimicrobial applications.