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SERS-based immunosensor for E. coli contaminants detection in milk using silver-coated nanoporous silicon substrates by Divagar Muthukumar; Giorgi Shtenberg is a Chemistry article available to read on EtoBox.

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The dairy sector is frequently affected by contagious and environmental factors that spread between animals by numerous means and induce the inflammatory disease of bovine mastitis (BM). Herein, silver decorated porous silicon (Ag-pSi) SERS platform was designed for rapid and reliable Escherichia coli (predominant BM pathogen) detection in various milk origins. The inherent surface void and pore morphology were physically optimized to augment the SERS effect using 4-aminothiphenol (4ATP) while achieving an enhancement factor >4.6 × 107. An indirect immunoassay evaluated the residual unreacted antibodies using an optimized 4ATP/Ag-pSi SERS platform modified with secondary antibodies. Under optimized conditions, the porous substrate offered high sensitivity toward target bacteria detection of 3 CFU mL−1 and linear response of 101–105 CFU mL−1. Moreover, the selectivity and specificity of the designed sensing platform were cross-validated against other interfering bacteria without compromising its performance efficiencies. Finally, the applicability of the developed system for real-life conditions was elucidated in different milk samples (bovine, goat, sheep) with recovery values of 7

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Author

Divagar Muthukumar; Giorgi Shtenberg

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Chemistry (Physical Sciences)