Raman-based detection of bacteria using silver nanoparticles conjugated with antibodies
Literature Information
Publication Date
2007-06-05
DOI
10.1039/B701160A
Impact Factor
4.616
Authors
Ghinwa Naja, Pierre Bouvrette, Sabahudin Hrapovic, John H. T. Luong
View Original
Abstract
Surface enhanced Raman scattering (SERS) has been used to detect bacteria captured by polyclonal antibodies sorbed onto protein-A-modified silver nanoparticles. The selectivity and discrimination of the technique were assured by using a specific antibody to the model bacterium, Escherichia coli. As the SERS enhancement mechanism depends upon the metal surface proximity, 8 nm was considered as the optimum distance between the bacterium and the nanoparticle surface. Spectral reproducibility was verified using Principal Components Analysis to differentiate the clusters corresponding to the biomolecules and/or bacteria sorbed onto nanoparticles. Compared to the normal Raman spectrum, the SERS technique resulted in an intensity enhancement of over 20-fold.
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