π-Donor/π-Acceptor Interactions for the Encapsulation of Neurotransmitters on Functionalized Polysilicon-Based...

Area of Science:

• Materials Science
• Supramolecular Chemistry
• Nanotechnology

Background:

• Bipyridinium salts (viologens) are π-acceptors that interact with π-donors, enabling self-assembly.
• This interaction is leveraged for controlled encapsulation and release of π-donor compounds.
• Polysilicon microparticles offer a versatile platform for functionalization.

Purpose of the Study:

• To synthesize and immobilize gemini-type amphiphilic bipyridinium salts on polysilicon microparticles.
• To investigate their capacity for encapsulating and releasing π-donor neurotransmitters.
• To assess the safety and efficacy of the developed system.

Main Methods:

• Synthesis and characterization of four gemini-type amphiphilic bipyridinium salts.
• Immobilization (covalent and non-covalent) on polysilicon surfaces and microparticles.
• Spectroscopic (UV-Vis, fluorescence) and chromatographic (HPLC) analysis for complex formation and release quantification.
• Contact angle measurements for surface characterization.
• Cytotoxicity and genotoxicity assays (3T3/NIH, HepG2, Caco-2 cell lines).

Main Results:

• Successful synthesis and immobilization of bipyridinium salts on polysilicon.
• Demonstrated encapsulation of neurotransmitters (dopamine, serotonin, adrenaline, noradrenaline).
• Controlled release triggered by ascorbic acid (Vitamin C).
• Low cytotoxicity and genotoxicity of the functionalized bipyridinium salt (1·4PF).

Conclusions:

• Functionalized polysilicon microparticles effectively encapsulate and release neurotransmitters.
• The system offers a promising platform for targeted drug delivery or biosensing applications.
• The low toxicity profile supports potential in vivo applications.