Multifunctional PTCA/GO for a Glucose-Driven Electrochemiluminescence Biosensor.

Area of Science:

• Electrochemistry
• Materials Science
• Biochemistry

Background:

• Hydrogen peroxide self-decomposition limits 3,4,9,10-perylene tetracarboxylic acid (PTCA) performance in electrochemiluminescence (ECL).
• Novel coreactants are needed to improve ECL sensitivity and efficiency.

Purpose of the Study:

• To develop a new coreactant system for PTCA-based ECL.
• To enhance the detection of glucose and alkaline phosphatase (ALP) using ECL.

Main Methods:

• PTCA/graphene oxide (GO) was synthesized and characterized.
• PTCA/GO was used to activate glucose, generating reactive oxygen species (ROS).
• The oxygen reduction reaction (ORR) pathway of PTCA/GO was investigated.

Main Results:

• PTCA/GO demonstrated glucose oxidase-like and catalase-like activities, producing hydroxyl radicals (·OH) and superoxide radicals (O2•−).
• The ORR of PTCA/GO followed a four-electron pathway, increasing ROS generation.
• The generated ROS reacted with PTCA anion radicals, leading to strong ECL emission.

Conclusions:

• PTCA/GO effectively activates glucose to generate ROS for enhanced PTCA ECL.
• A novel ECL biosensor based on the PTCA/GO-glucose system achieved ultrasensitive detection of glucose and ALP.