Fabricating three-dimensional carbohydrate hydrogel microarray for lectin-mediated bacterium capturing.

Area of Science:

• Biomaterials Science
• Microbiology
• Carbohydrate Chemistry

Background:

• Escherichia coli (E. coli) detection is crucial for public health.
• Current detection methods can be time-consuming and complex.
• Targeting bacterial surface components offers specific capture strategies.

Purpose of the Study:

• To develop a 3D carbohydrate hydrogel microarray for efficient E. coli capture.
• To investigate the binding interactions between E. coli and immobilized carbohydrates.
• To establish a sensitive assay for bacterial detection and adhesion inhibition.

Main Methods:

• Fabrication of a 3D carbohydrate-modified polyacrylamide hydrogel microarray.
• Utilizing multivalent binding of concanavalin A (Con A) and immobilized monosaccharides for E. coli capture.
• Employing bright-field microscopy for direct observation of captured bacteria.
• Performing bacterial adhesion inhibition assays with various saccharides.

Main Results:

• The α-D-mannopyranoside (Man-α) modified hydrogel surface demonstrated high efficiency in capturing E. coli.
• The assay achieved a low detection limit of 1.0×10^4 cells/mL and a wide dynamic range (1.0×10^5 to 1.0×10^9 cells/mL).
• Satisfactory results were obtained in bacterial adhesion inhibition assays using ten different saccharides.

Conclusions:

• The 3D carbohydrate hydrogel microarray serves as an effective micro-reactor for E. coli capture.
• The assay provides a sensitive and reliable platform for E. coli detection.
• The developed system shows potential for studying bacterial adhesion mechanisms and developing inhibitors.