Electrochemical bacterial detection using poly(3-aminophenylboronic acid)-based imprinted polymer.

Area of Science:

• Biomaterials Science
• Analytical Chemistry
• Biosensor Technology

Background:

• Rapid bacterial detection is critical for food safety, clinical diagnostics, and biosecurity.
• Whole-cell imprinted polymers offer potential as selective recognition elements in biosensors.
• Existing methods often lack specificity or require complex sample preparation.

Purpose of the Study:

• To develop an electrochemical cell-imprinted polymer (CIP) using 3-aminophenylboronic acid (3-APBA) for selective bacterial detection.
• To investigate the reversible binding capabilities of the CIP for easy bacterial release and sensor regeneration.
• To evaluate the performance of the CIP-based biosensor for label-free bacterial detection.

Main Methods:

• Electrochemical fabrication of a cell-imprinted polymer (CIP) using 3-aminophenylboronic acid (3-APBA) monomer.
• Utilizing the specific interaction between boronic acid groups and cis-diols on bacterial cell surfaces.
• Employing electrochemical impedance spectroscopy (EIS) for label-free detection of target bacteria (Staphylococcus epidermidis).

Main Results:

• The CIP exhibited both morphological and chemical recognition abilities for target bacteria.
• The boronic acid-cis-diol interaction allowed for reversible bacterial capture and easy release, enabling sensor regeneration.
• The biosensor demonstrated a linear response over a bacterial concentration range of 10^3-10^7 CFU/mL.
• High selectivity was observed, with the CIP discriminating target bacteria from non-target species.

Conclusions:

• The developed CIP provides a highly specific and affinity-based recognition element for bacterial detection.
• The switchable interface facilitates easy removal and regeneration of the sensor, enhancing its practical utility.
• This approach holds significant promise for advancing rapid and selective bacterial detection in various critical fields.