Graphene-based hybrid for enantioselective sensing applications

Area of Science:

• Chemical Biology
• Analytical Chemistry
• Materials Science

Background:

• Chirality is crucial in chemical biology and pharmacology, necessitating methods to differentiate chiral compound forms.
• Existing methods for enantiomer discrimination can be complex or limited in scope.
• Developing efficient and versatile enantioselective sensors is of significant interest.

Purpose of the Study:

• To create an efficient and generic enantioselective sensor.
• To demonstrate the sensor's capability in both electrical and optical modes for detecting tryptophan enantiomers (D-/L-Trp).
• To elucidate the recognition mechanism using experimental data and computational modeling.

Main Methods:

• Fabrication of a hybrid material by coupling reduced graphene oxide (rGO) with γ-cyclodextrin (γ-CD).
• Enantioselective sensing using voltammetric (electrical) and photoluminescence (optical) measurements.
• Molecular docking simulations to understand the chiral recognition mechanism.

Main Results:

• The rGO/γ-CD hybrid material exhibited enantioselective sensing for D-/L-Trp in both electrical and optical modes.
• Electrochemical measurements showed distinct oxidation potentials due to differing Gibbs free energy of enantiomer interactions.
• Optical measurements revealed enantioselective photoluminescence quenching attributed to energy transfer and differential complex formation with γ-CD.

Conclusions:

• The developed rGO/γ-CD sensor provides an efficient and generic platform for enantioselective detection.
• The study successfully combined experimental (voltammetric, photoluminescence) and computational (molecular docking) methods to explain chiral recognition.
• This approach represents a novel application of molecular docking for understanding graphene-related hybrid material enantiosensing capabilities.