Nanoshell-Enhanced Raman Spectroscopy on a Microplate for Staphylococcal Enterotoxin B Sensing

Area of Science:

• Nanotechnology
• Biochemistry
• Analytical Chemistry

Background:

• Staphylococcal enterotoxin B (SEB) is a dangerous toxin requiring rapid detection.
• Existing detection methods often lack sensitivity or speed.
• Surface-enhanced Raman scattering (SERS) offers high sensitivity for molecular detection.

Purpose of the Study:

• To develop a sensitive SERS immunosensor for SEB detection.
• To utilize a novel Au@Ag core-shell nanoparticle structure for enhanced signal reporting.
• To validate the sensor's performance in complex matrices like milk.

Main Methods:

• Fabrication of Au@Ag core-shell nanoparticles with a 4-nitrothiophenol (4-NTP) linker.
• Immobilization of antibodies onto the nanoparticle surface for SEB capture.
• Detection of SEB using SERS spectroscopy with the Au@Ag nanoparticles as signal reporters.
• Quantification of SEB in spiked milk samples.

Main Results:

• The Au@Ag core-shell structure provided significant electromagnetic enhancement for SERS.
• The developed SERS immunosensor achieved a low limit of detection of 1.3 pg/mL for SEB.
• The sensor demonstrated high accuracy and reliability when analyzing SEB in spiked milk samples.

Conclusions:

• The SERS-encoded Au@Ag core-shell immunosensor is a highly sensitive and accurate platform for SEB detection.
• This technology shows great promise for the rapid detection of biotoxins, pathogens, and environmental pollutants.
• The developed method offers a viable tool for food safety and environmental monitoring applications.