Amino acid ionic liquid modified mesoporous carbon: a tailor-made nanostructure biosensing platform

Area of Science:

• Materials Science
• Biotechnology
• Analytical Chemistry

Background:

• Ordered graphitized mesoporous carbon (GMC) is a hydrophobic material with limited applications in aqueous biosensing.
• Amino acid ionic liquids (AAILs) offer biocompatibility and improved dispersion properties.
• Tyrosinase biosensors are crucial for detecting phenolic pollutants.

Purpose of the Study:

• To develop a novel nanocomposite material for enhanced tyrosinase biosensor performance.
• To investigate the synergistic effects of GMC and AAILs on tyrosinase activity and sensor stability.
• To create a sensitive and stable biosensor for phenol detection.

Main Methods:

• Surface modification of GMC with hydrophilic AAILs (1-ethyl-3-methylimidazolium alanine, EMIM[Ala]).
• Fabrication of a tyrosinase biosensor using the GMC-AAIL nanocomposite.
• Comparative analysis of biosensor performance with and without AAIL modification.
• Electrochemical characterization and stability testing of the biosensor.

Main Results:

• The GMC-AAIL nanocomposite exhibited enhanced biocompatibility and aqueous dispersion.
• Tyrosinase activity in the presence of EMIM[Ala] was approximately ten times higher than in pure PBS.
• The GMC-AAIL-based biosensor showed superior signal-to-noise ratio, stability, repeatability, and working life compared to GMC-based sensors.
• The biosensor retained over 90% of its initial response after 21 days of storage.
• A low detection limit of 20 nmol L(-1) and high sensitivity of 1385 mA cm(-2) M(-1) were achieved for phenol detection.

Conclusions:

• Surface modification of GMC with hydrophilic AAILs significantly improves tyrosinase biosensor performance.
• The GMC-AAIL nanocomposite provides a promising platform for enzyme-based biosensors and biocatalysis.
• This approach offers a strategy for prolonging enzyme stability in biosensing applications.