Improvisation of diffusion coefficient in surface modified magnetite nanoparticles: A novel perspective

Area of Science:

• Materials Science
• Nanotechnology
• Biochemistry

Background:

• Surface properties of support materials are critical for tethering biomolecules.
• Porous carriers often present diffusional limitations that necessitate surface modification.
• Nanoparticles require surface engineering to optimize their functionality.

Purpose of the Study:

• To investigate the effect of chitosan surface coating on the porosity of solvo-thermally synthesized magnetite nanoparticles (MNs).
• To evaluate the impact of altered porosity on the diffusional properties and activity of tethered urease.
• To establish a novel approach for mitigating diffusional limitations in nanoparticle-based systems.

Main Methods:

• Solvo-thermal synthesis of magnetite nanoparticles (MNs).
• Surface modification of MNs with chitosan to form MNβ.
• Characterization using FT-IR, EDS, DLS, and magnetization curves.
• Enzyme (urease) tethering and diffusion coefficient (De) evaluation via conductivity measurements.
• Optimization using Box-Behnken design (BBD).

Main Results:

• Successful synthesis and surface modification of MNs with chitosan confirmed by instrumental analysis (FT-IR, EDS, DLS).
• Chitosan coating altered nanoparticle porosity, impacting sorption profiles.
• Optimized conditions using BBD led to enhanced activity of tethered urease (U-MNβ) due to improved diffusion.
• Superparamagnetic behavior and narrow size distribution of MNs were observed.

Conclusions:

• Chitosan surface coating effectively modifies the porosity of magnetite nanoparticles.
• Altered surface porosity enhances the diffusion and activity of tethered enzymes.
• This approach offers a promising strategy to overcome diffusional limitations in nanoparticle applications.
• The study provides new insights into nanoparticle surface modification for biomolecular tethering.