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TETT-functionalized TiO2 nanoparticles for DOX loading: a quantum mechanical study at the atomic scale.

Martina Datteo1, Lorenzo Ferraro1, Gotthard Seifert2

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Researchers explored functionalizing titanium dioxide (TiO2) nanoparticles with silane-type ligands (TETT) for drug delivery. This study details TETT anchoring, stability, and interaction with doxorubicin (DOX) on TiO2 nanoparticles.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Quantum Chemistry

Background:

  • Titanium dioxide (TiO2) nanoparticles are promising for biomedical applications.
  • Developing efficient nanosystems for simultaneous photodynamic therapy and drug transport requires precise surface functionalization.
  • Understanding ligand-surface interactions is crucial for designing targeted drug delivery systems.

Purpose of the Study:

  • To investigate the functionalization of TiO2 nanoparticles with silane-type ligands (TETT) using quantum mechanical methods.
  • To analyze the stability and interactions of TETT ligands on the nanoparticle surface.
  • To determine the binding mechanisms and structures of doxorubicin (DOX) anticancer drug on the functionalized nanoparticle.

Main Methods:

  • Self-consistent charge density functional tight-binding (SCC-DFTB) method for quantum mechanical calculations.
  • Molecular dynamics simulations at 300 K to assess thermal stability.
  • Computational modeling of medium and full coverage TETT ligand functionalization.
  • Analysis of atomistic interactions between ligands, surface, and doxorubicin molecule.

Main Results:

  • The mechanism of TETT ligand anchoring and its stability under thermal treatment were determined.
  • Interactions among TETT ligands and between ligands and the TiO2 surface were analyzed for different coverage models.
  • Two minimum energy structures for doxorubicin attachment to the fully covered nanoparticle were identified.
  • Both covalent and non-covalent (electrostatic) interaction details between DOX and the functionalized nanoparticle were provided.

Conclusions:

  • The study provides atomistic insights into the functionalization of TiO2 nanoparticles for potential drug delivery applications.
  • The developed nanosystem shows promise for simultaneous photodynamic therapy and drug transport.
  • Future work will focus on drug loading capacity and the influence of the aqueous environment's pH.