Novel Approach of a Phage-Based Magnetoelastic Biosensor for the Detection of Salmonella enterica serovar Typhimurium in Soil

Abstract

To date, there has been no employment of a magnetoelastic (ME) biosensor method to detect serovar Typhimurium in soil. The ME biosensor method needs to be investigated and modified for its successful performance. The filtration method, cation-exchange resin method, and combinations of both methods were employed for the extraction of. Typhimurium from soil. The number of . Typhimurium and the resonant frequency shift of the ME sensor were then compared using a brilliant green sulfa agar plate and an HP 8751A network analyzer. A blocking study was performed using bovine serum albumin (BSA), polyethylene glycol (PEG), and casein powder suspension. Finally, the modified ME biosensor method was performed to detect. Typhimurium in soil. The number of . Typhimurium was significantly decreased from 7.10 log CFU/soil to 4.45-4.72 log CFU/soil after introduction of the cation-exchange resin method. The greatest resonant frequency shift of the measurement sensor was found when employing centrifugation and filtration procedures. The resonant frequency shift of the PEG-blocked measurement sensor was 3,219 ± 755 Hz, which was significantly greater than those of the BSA- and casein-blocked ME sensor. The optimum concentration of PEG was determined to be 1.0 mg/ml after considering the resonant shift and economic issue. Finally, the modified ME biosensor method was able to detect. Typhimurium in soil in a dose-response manner. Although these modifications of the ME biosensor method sacrificed some advantages, such as cost, time effectiveness, and operator friendliness, this study demonstrated a novel approach of the ME biosensor method to detect . Typhimurium in soil.

Ultrasensitive Detection of Biomarkers by Using a Molecular Imprinting Based Capacitive Biosensor

“…Here, biosensors are superior to existing methods, in particular, due to their robustness and sensitivity. Specifically for the detection of infectious agents, bacteriophages are recently regarded as alternative biorecognition element for biosensors due to their host bacteria specificity 33 34 35 . Replacement of antibodies with bacteriophages is very promising in order to reduce the cost and increase the stability even further 36 .…”

Ultrasensitive Detection of Biomarkers by Using a Molecular Imprinting Based Capacitive Biosensor

“…Here, biosensors are superior to existing methods, in particular, due to their robustness and sensitivity. Specifically for the detection of infectious agents, bacteriophages are recently regarded as alternative biorecognition element for biosensors due to their host bacteria specificity 33,34,35 . Replacement of antibodies with bacteriophages is very promising in order to reduce the cost and increase the stability even further 36 .…”

Magnetoelastic Materials for Monitoring and Controlling Cells and Tissues

“…Implementing chemical surface modification techniques provides another means of restricting non-specific protein adsorption. A common antifouling method used in the medical field and with ME materials includes creating various types of hydrophilic SAMs and PEG to deter non-specific protein attachment [34,38]. Compared to protein blocking agents, synthetic polymer coatings are typically more robust, however they are still susceptible to oxidative damage over time [37].…”