Horseradish Peroxidase Labelled-Sandwich Electrochemical Sensor Based on Ionic Liquid-Gold Nanoparticles for Lactobacillus brevis

Lactobacillus brevis is the most common bacteria that causes beer spoilage. In this work, a novel electrochemical immunosensor was fabricated for ultra-sensitive determination of L. brevis. Gold nanoparticles (AuNPs) were firstly electro-deposited on the electrode surface for enhancing the electro-conductivity and specific surface area. Ionic liquid was used for improving the immobilization performance of the immunosensor. After optimization, a linear regression equation can be observed between the increment (current) and concentration of L. brevis from 10(4) CFU/mL to 10(9) CFU/mL. The limit of detection can be estimated to be 10(3) CFU/mL.

Automated summary

A novel electrochemical immunosensor was fabricated for ultra-sensitive determination of Lactobacillus brevis, with gold nanoparticles electro-deposited on the electrode surface and ionic liquid used for improving the sensor's immobilization performance. After optimization, a linear regression equation was observed between the current increment and L. brevis concentration, with a detection limit estimated at 10^3 CFU/mL.