A stable and controllable Prussian blue layer electrodeposited on self-assembled monolayers for constructing highly...

Area of Science:

• Electrochemistry
• Materials Science
• Biotechnology

Background:

• Developing stable and sensitive biosensors is crucial for accurate glucose monitoring.
• Prussian blue (PB) offers catalytic properties but requires stable immobilization.
• Self-assembled monolayers (SAMs) can provide a controlled surface for material deposition.

Purpose of the Study:

• To create a stable Prussian blue (PB) layer on a gold electrode using thioctic acid amide (T-NH(2)) self-assembled monolayers (SAMs).
• To develop a highly efficient glucose biosensor by immobilizing glucose oxidase (GOD) within a PB-chitosan matrix.
• To evaluate the performance of the developed biosensor, including stability, sensitivity, and anti-interference.

Main Methods:

• Electrodeposition of Prussian blue (PB) onto gold electrodes modified with thioctic acid amide (T-NH(2)) SAMs.
• Immobilization of glucose oxidase (GOD) using a PB-chitosan composite matrix.
• Electrochemical characterization and performance evaluation of the glucose biosensor.

Main Results:

• The PB/SAMs electrode demonstrated enhanced stability and catalytic activity for hydrogen peroxide reduction compared to bare electrodes.
• The developed biosensor achieved high sensitivity (59.9 mA M(-1) cm(-2)) and a low detection limit (2 microM) for glucose at 0.0 V.
• The biosensor exhibited good anti-interference properties and characterized kinetic parameters (K(m)(app) = 5.4 mM).

Conclusions:

• The PB layer electrodeposited on T-NH(2) SAMs provides a stable and effective platform for biosensor development.
• The PB-chitosan matrix facilitates highly efficient GOD immobilization, leading to sensitive glucose detection.
• This approach offers a promising strategy for creating advanced biosensors and bioelectronic devices.