A DNAzyme-Based Colorimetric Paper Sensor for Helicobacter pylori

Area of Science:

• Biotechnology and Biomedical Engineering
• Molecular Diagnostics
• Point-of-Care Testing

Background:

• Reliable detection of pathogenic bacteria in complex biological samples is a significant challenge.
• Helicobacter pylori (H. pylori) is a pathogen linked to gastric carcinoma, gastric ulcers, and duodenal ulcers.
• Current diagnostic methods often require complex sample processing and specialized equipment.

Purpose of the Study:

• To develop a simple, specific, and sensitive colorimetric paper device for H. pylori detection.
• To enable rapid point-of-care diagnosis of H. pylori infections in human stool samples.
• To create a stable diagnostic tool with minimal sample processing requirements.

Main Methods:

• Utilized an RNA-cleaving DNAzyme, activated by a specific H. pylori protein biomarker, as the sensor molecule.
• Designed a colorimetric paper-based assay leveraging the DNAzyme's catalytic activity.
• Tested the device's performance using human stool samples with minimal pre-treatment.

Main Results:

• The developed paper device demonstrated specific and sensitive detection of H. pylori.
• The assay provided results within minutes, requiring minimal sample processing.
• The device maintained full functionality for at least 130 days under ambient temperature storage.

Conclusions:

• A DNAzyme-enabled paper-based sensor offers a promising approach for rapid H. pylori detection.
• This technology facilitates the development of point-of-care diagnostic devices for pathogens in complex samples.
• The device's stability and ease of use support its potential application in clinical settings.