Ultrasensitive Detection of Staphylococcus aureus Based on Photonic Crystal Microsphere Suspension Array-Assisted...

Area of Science:

• Biotechnology
• Food Safety
• Nanotechnology

Background:

• Current methods for detecting foodborne pathogens like Staphylococcus aureus are often slow and lack sensitivity, posing challenges for effective food safety management, especially during outbreaks.
• There is a critical need for high-throughput, sensitive, and portable detection strategies to ensure food safety and enable rapid response to contamination events.

Purpose of the Study:

• To develop an ultrasensitive suspension array for the detection of Staphylococcus aureus.
• To integrate photonic crystal microsphere (PCM) technology with loop-mediated isothermal amplification (LAMP) for enhanced pathogen detection.
• To evaluate the sensitivity, specificity, and practical applicability of the developed assay for foodborne pathogen analysis.

Main Methods:

• Construction of a suspension array system utilizing photonic crystal microspheres (PCMs) designed with biomimetic microporous three-dimensional structures.
• Integration of PCM's optical signal enhancement capabilities with the amplification power of loop-mediated isothermal amplification (LAMP).
• Detection of target DNA from Staphylococcus aureus without the need for prolonged culturing procedures.

Main Results:

• The developed PCM-LAMP suspension array demonstrated significantly enhanced fluorescence intensity due to the periodic dielectric nanostructure of the biomimetic PCMs.
• Achieved an ultrasensitive limit of detection for Staphylococcus aureus genomic DNA as low as 0.18 fM under optimal conditions.
• The assay exhibited excellent specificity against other bacterial species and accurately quantified trace amounts of target DNA in food samples.

Conclusions:

• The PCM-LAMP suspension array provides a highly sensitive and rapid method for detecting Staphylococcus aureus, overcoming limitations of traditional culture-based methods.
• The integration of PCM technology with LAMP offers a promising platform for improving food safety by enabling swift and accurate identification of foodborne pathogens.
• This developed assay holds significant potential for practical applications in routine food safety monitoring and outbreak investigations.