Electrochemical Detection of Different Foodborne Bacteria for Point-of-Care Applications

Abstract

Bacterial infections resulting from foodborne pathogenic bacteria cause millions of infections that greatly threaten human health and are one of the leading causes of mortality around the world. To counter this, the early, rapid, and accurate detection of bacterial infections is very important to address serious health issue concerns. We, therefore, present an electrochemical biosensor based on aptamers that selectively bind with the DNA of specific bacteria for the accurate and rapid detection of various foodborne bacteria for the selective determination of bacterial infection types. Different aptamers were synthesized and immobilized on Au electrodes for selective bindings of different types of bacterial DNA (Escherichia coli, Salmonella enterica, and Staphylococcus aureus) for the accurate detection and quantification of bacterial concentrations from 101 to 107 CFU/mL without using any labeling methods. Under optimized conditions, the sensor showed a good response to the various concentrations of bacteria, and a robust calibration curve was obtained. The sensor could detect the bacterial concentration at meager quantities and possessed an LOD of 4.2 × 101, 6.1 × 101, and 4.4 × 101 CFU/mL for S. Typhimurium, E. Coli, and S. aureus, respectively, with a linear range from 100 to 104 CFU/mL for the total bacteria probe and 100 to 103 CFU/mL for individual probes, respectively. The proposed biosensor is simple and rapid and has shown a good response to bacterial DNA detections and thus can be applied in clinical applications and food safety monitoring.

A TSHR-Targeting Aptamer in Monocytes Correlating with Clinical Activity in TAO

“…Because of its high affinity, low cost and editability, this aptamer could be used to construct various types of biochemical or electrochemical sensors. 50 …”

“…Because of its high affinity, low cost and editability, this aptamer could be used to construct various types of biochemical or electrochemical sensors. 50 TSHR has been associated with immune system dysfunction and in the pathogenesis of Graves' disease (GD) and TAO, suggesting that inhibiting TSHR activity may have a therapeutic effect in these conditions. Blocking TSHR using the antibody Ki-70 has been shown effective in the treatment of TAO and GD, suggesting that TSHR-21-42 may have similar activity in these diseases.…”

D-Glucose-Mediated Gold Nanoparticle Fabrication for Colorimetric Detection of Foodborne Pathogens

“…Various techniques have been developed for the endpoint detection of LAMP, such as fluorescence [ 20 ], chemiluminescence [ 21 ], electrochemical detection [ 22 ], and colorimetric detection [ 23 ]. In particular, colorimetric detection provides simple and fast visual detection of amplicons and is recognized as an effective platform for POCT [ 24 ].…”