Large pore raspberry textured phosphonate@silica nanoparticles for protein immobilization

Area of Science:

• Materials Science
• Nanotechnology
• Biomaterials

Background:

• Developing novel nanomaterials for efficient protein immobilization is crucial for biosensors and drug delivery.
• Existing mesoporous silica nanoparticles (MSN) can suffer from instability and limited protein loading capacity.

Purpose of the Study:

• To synthesize and characterize large-pore, raspberry-textured phosphonate@silica nanoparticles (RNP_PME(2.5)) for enhanced protein immobilization.
• To evaluate the protein loading capacity, stability, and structural integrity of BSA immobilized on RNP_PME(2.5) compared to other silica nanoparticles.

Main Methods:

• Synthesis of monodisperse raspberry textured phosphonate@silica nanoparticles (70-90 nm) with large pores (11 nm) using a specific organosilanephosphonate.
• Characterization of nanoparticle properties including pore size, surface modification, and stability.
• Protein immobilization studies using bovine serum albumin (BSA) to compare loading capacity and stability with smaller pore nanoparticles and MSN.

Main Results:

• RNP_PME(2.5) nanoparticles demonstrated high phosphonate loading (2.5 mmol g^-1) and excellent stability in aqueous dispersions.
• Highest BSA loading capacity (266 mg g^-1) was achieved with RNP_PME(2.5).
• BSA-immobilized RNP_PME(2.5) exhibited superior stability and better protection against structural distortion compared to other tested nanoparticles.

Conclusions:

• Large-pore raspberry textured phosphonate@silica nanoparticles are effective platforms for high-capacity and stable protein immobilization.
• These nanoparticles offer advantages over smaller pore silica nanoparticles and MSN for protein-based applications.
• The biocompatibility of RNP_PME(2.5) was confirmed through cell internalization studies with HeLa cells.