Abstract
Salmonella is a common foodborne pathogen, and its detection is essential for managing public food safety. Lateral flow assay (LFA) strips are well suited for the purpose as they are inexpensive and easy to use. However, the sensitive detection of low-concentration targets requires the use of signal amplification strategies. This paper presents a LFA for the ultrasensitive detection of Salmonella based on recombinase polymerase amplification (RPA) and fluorescence-enhanced composite nanospheres dSiO2@CD@SiO2 (dCDS). RPA is capable of rapid (∼20 min) exponential amplification of bacterial DNA and does not require complex instrumentation. Mesoporous silica (dSiO2) has a large specific surface area and radial pore size, making it an excellent structural material for internal assembly. Nanoparticles obtained by loading carbon dots (CDs) had a strong fluorescence signal and stability. We used dCDSs as reporter molecules, which captured a large number of DNA-dCDS complexes on the test line of the LFA. With double signal amplification, the RPA and dCDS-based LFA showed greatly improved sensitivity: The limits of detection for Salmonella in buffer and milk were 3.8 CFU/mL and 36 CFU/mL, respectively. This study provides an inexpensive strategy for the sensitive detection of pathogenic bacteria.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.