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Coordination bonding-based polydopamine-modified mesoporous silica for sustained avermectin release.

Zhichuan Shen1, Hongjian Wen1, Hongjun Zhou2

  • 1School of Chemistry and Chemical Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou 510220, China.

Materials Science & Engineering. C, Materials for Biological Applications
|September 25, 2019
PubMed
Summary
This summary is machine-generated.

Mesoporous silica nanoparticles modified with polydopamine and metal ions show enhanced pesticide delivery. These novel materials improve UV resistance and controlled release of avermectin, offering a promising pesticide delivery system.

Keywords:
CoordinationMesoporous silicaMetal ionsPolydopamineSustained avermectin release

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Agricultural Chemistry

Background:

  • Mesoporous silica nanoparticles (MSNs) are explored as pesticide delivery vehicles.
  • Surface modification of MSNs can enhance pesticide interaction and efficacy.
  • Polydopamine (PDA) coating offers versatile functionalization for nanoparticles.

Purpose of the Study:

  • To develop and characterize polydopamine-modified mesoporous silica nanoparticles (MSN-PDA) for pesticide delivery.
  • To investigate the effect of metal ion impregnation (Cu, Zn, Fe) on MSN-PDA properties.
  • To evaluate the adsorption, release, UV resistance, and adhesive properties of the developed materials using avermectin (AVM) as a model pesticide.

Main Methods:

  • One-pot synthesis of MSN-PDA nanoparticles with dopamine addition.
  • Impregnation of copper, zinc, and iron ions onto MSN-PDA.
  • Characterization of material structure, surface area, and morphology.
  • Adsorption and in vitro release studies of avermectin (AVM) at different pH values.
  • Assessment of anti-UV properties and adhesive capabilities.

Main Results:

  • MSN-PDA materials exhibited spherical morphology with high surface areas (635.833–1048.960 m²/g).
  • Copper and iron ion complexation significantly enhanced UV resistance and increased AVM loading capacity (to 248 and 243 mg/g, respectively).
  • Metal ions demonstrated a bridging effect, significantly reducing AVM cumulative release (<30% in 180 h) compared to unmodified MSN (<50% in 50–90 h).
  • The adhesive effect of PDA was found to be reduced by metal ion complexation.

Conclusions:

  • MSN-PDA nanoparticles, especially when complexed with copper and iron ions, represent an effective system for controlled pesticide delivery.
  • The enhanced UV resistance and sustained release profile contribute to improved performance as a pesticide vehicle.
  • Metal ion interactions play a crucial role in modulating the adsorption, release kinetics, and stability of the MSN-PDA system.