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Surface enhanced Raman scattering spectroscopy of Ag nanoparticle aggregates directly photo-reduced on pathogenic bacterium (Helicobacter pylori)

Paper ID Volume ID Publish Year Pages File Format Full-Text
26724 43973 2011 6 PDF Available
Title
Surface enhanced Raman scattering spectroscopy of Ag nanoparticle aggregates directly photo-reduced on pathogenic bacterium (Helicobacter pylori)
Abstract

To enable us surface enhanced Raman scattering (SERS) spectroscopic detection of bacteria having low affinity for Ag colloidal nanoparticles, we examined simple experimental methodology; SERS detections using Ag nanoparticles aggregates directly synthesized by photo-reduction on the surfaces of such bacteria (Helicobacter pylori). The synthesized Ag nanoparticles aggregated on bacterial surfaces and generated temporally and spectrally fluctuated SERS spectra that are tentatively attributed to amide groups of surface proteins. The selective appearance of amide groups and fluctuation in SERS spectra indicated chemical contribution to SERS. By referring to previous reports, we estimated total SERS enhancement factors to be ∼1011. Electromagnetic (EM) enhancement factors of SERS are up to ∼108. Thus, we considered that chemical ones may be <∼103 in the present SERS active system.

► SERS detections of bacteria which have low affinity for Ag colloidal nanoparticles using Ag nanoparticles photo-reduced on the bacterial surfaces. ► Temporally and spectrally fluctuated SERS spectra from bacterial surfaces are tentatively attributed to amide groups of surface proteins. ► The selective appearance of amide groups in SERS spectra indicates chemical contribution to SERS.

Keywords
SERS; Ag nanoparticle aggregates; Photo-reduction; Bacterial surfaces (Helicobacter pylori)
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Surface enhanced Raman scattering spectroscopy of Ag nanoparticle aggregates directly photo-reduced on pathogenic bacterium (Helicobacter pylori)
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 221, Issues 2–3, 25 June 2011, Pages 181–186
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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