Surface-enhanced Raman spectroscopic-based aptasensor for Shigella sonnei using a dual-functional metal complex-ligated gold nanoparticles dimer

Colloids and Surfaces. B, Biointerfaces
Shijia WuZhouping Wang

Abstract

Herein, we constructed an aptamer-based sensor for the sensitive and highly specific detection of Shigella sonnei via surface enhanced Raman spectroscopy (SERS) analysis. A composite material integrated of the Raman active 4-MBA ligand of the Eu-complex and citrate-stabilized Au nanoparticles (cit-Au NPs) was synthesized and served as both active substrate and Raman reporter. Aptamers targeted to S. Sonnei was then modified onto the surface of this dual-functional material. With the introduction of S. Sonnei, aptamer bound with target with high affinity and specificity, leaving the dual-functional material onto the bacteria. The SERS intensity response showed a strong positive linear correlation (R = 0.9956) with increasing concentrations of S. sonnei (ranging from 10 to 106 cfu/mL). High specificity was achieved at Shigella species (S. dysenteriae, S. flexneri, S. boydii) and other common bacteria (Salmonella typhimurium, Staphylococcus aureus and Escherichia coli). When applied in real samples, the approach showed recoveries from 92.6 to 103.8 %. The designed approach holds great potential for the construction of various aptasensors for the effective and convenient detection of different food hazards.

Citations

Jan 7, 2021·International Microbiology : the Official Journal of the Spanish Society for Microbiology·Archana VishwakarmaMohandass Ramya
Feb 9, 2021·World Journal of Microbiology & Biotechnology·Danliang LiLili Chen
Feb 15, 2021·Biochemical and Biophysical Research Communications·Maksim V GorbachevskiiAndrei A Novikov
Mar 9, 2021·Frontiers in Microbiology·Mariam Saad, Sebastien P Faucher
Jul 21, 2021·Critical Reviews in Food Science and Nutrition·Yi XuQuansheng Chen

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