Development of a rapid, one-step-visual method to detect Salmonella based on IC-LAMP method

Area of Science:

• Microbiology
• Food Safety
• Molecular Diagnostics

Background:

• Salmonella causes severe gastroenteritis and is prevalent in food samples.
• Current detection methods (cell culturing, immunoassay, PCR) are slow and labor-intensive.
• Rapid monitoring of Salmonella contamination is crucial for public health.

Purpose of the Study:

• Develop a rapid and sensitive immunocapture-loop-mediated isothermal amplification (IC-LAMP) assay.
• Establish a novel method for efficient Salmonella detection.

Main Methods:

• Produced high-affinity monoclonal antibody (mAb) 1B12 against Salmonella.
• Utilized immuno-magnetic beads (IMBs) coated with mAb 1B12 for Salmonella capture.
• Employed loop-mediated isothermal amplification (LAMP) targeting the conserved invA gene of Salmonella.

Main Results:

• Developed IC-LAMP assay with mAb 1B12 and LAMP, reducing detection time to 50 minutes.
• Achieved a detection limit of 5 CFU/ml in spiked water and milk samples.
• Demonstrated high specificity, with no cross-reactivity to similar bacteria.

Conclusions:

• The IC-LAMP assay is a rapid, sensitive, and visual method for Salmonella screening in food.
• This one-step assay is significantly faster than traditional PCR and other methods.
• IC-LAMP is suitable as a primary screening tool for Salmonella detection.