Aptamer-based SERS biosensor for whole cell analytical detection of E.  coli O157:H7.

Aptamer-based SERS biosensor for whole cell analytical detection of E. coli O157:H7. Anal Chim Acta. 2019 Nov 12;1081:146-156 Authors: Díaz-Amaya S, Lin LK, Deering AJ, Stanciu LA Abstract Infectious outbreaks caused by foodborne pathogens such as E. coli O157:H7 are still imposing a heavy burden for global food safety, causing acute illnesses and significant industrial impact worldwide. Despite the growth of biosensors as a research field, continuous innovation on detection strategies, novel materials and enhanced limits of detection, most of the platforms developed at the laboratory scale never will get to meet the market. The use of aptamers as capture biomolecules has been proposed as a promising alternative to overcome the harsh environmental conditions of industrial manufacturing processes, and to enhance the performance under real, complex, conditions. In this work, we present the feasibility of using aptameric DNA sequences, covalently conjugated to 4-aminothiophenol-gold nanoparticle complexes for the sensitive and highly specific detection of E. coli O157:H7 via surface enhanced Raman spectroscopy (SERS) analysis. Low concentrations of E. coli O157:H7 were detected and quantified within 20 min in both pure culture (∼101 CFU mL-1) and ground beef samples (∼102 CFU mL-1). The SERS intensity response showed a strong negative linear correlation (r2 = 0.995) with increasing concentrations of E. coli O157:...
Source: Analytica Chimica Acta - Category: Chemistry Authors: Tags: Anal Chim Acta Source Type: research