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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 2, Iss. 7 — Jul. 16, 2007

Characterization of a commercialized SERS-active substrate and its application to the identification of intact Bacillus endospores

Troy A. Alexander and Dianna M. Le  »View Author Affiliations


Applied Optics, Vol. 46, Issue 18, pp. 3878-3890 (2007)
http://dx.doi.org/10.1364/AO.46.003878


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Abstract

Surface-enhanced-Raman-spectroscopy (SERS) can be made an attractive approach for the identification of Raman-active compounds and biological materials (i.e., toxins, viruses, or intact bacterial cells or spores) through development of reproducible, spatially uniform SERS-active substrates. Recently, reproducible (from substrate to substrate), spatially homogeneous (over large areas) SERS-active substrates have been commercialized and are now available in the marketplace. Scanning electron microscopy and high-resolution, tapping-mode atomic force microscopy have been used to analyze these novel plasmonic surfaces for topographical consistency. Additionally, we have assessed, by wavelength-tunable microreflectance spectrometry, the spatial distribution of the localized surface plasmon resonance (LSPR) across a single substrate surface as well as the LSPR λ MAX variance from substrate to substrate. These analyses reveal that these surfaces are topologically uniform with small LSPR variance from substrate to substrate. Further, we have utilized these patterned surfaces to acquire SERS spectral signatures of four intact, genetically distinct Bacillus spore species cultivated under identical growth conditions. Salient spectral signature features make it possible to discriminate among these genetically distinct spores. Additionally, partial least squares, a multivariate calibration method, has been used to develop personal-computer-borne algorithms useful for classification of unknown spore samples based solely on SERS spectral signatures. To our knowledge, this is the first report detailing application of these commercially available SERS-active substrates to identification of intact Bacillus spores.

© 2007 Optical Society of America

OCIS Codes
(170.1580) Medical optics and biotechnology : Chemometrics
(300.6450) Spectroscopy : Spectroscopy, Raman

ToC Category:
Spectroscopy

History
Original Manuscript: December 22, 2006
Revised Manuscript: March 5, 2007
Manuscript Accepted: March 7, 2007
Published: May 31, 2007

Virtual Issues
Vol. 2, Iss. 7 Virtual Journal for Biomedical Optics

Citation
Troy A. Alexander and Dianna M. Le, "Characterization of a commercialized SERS-active substrate and its application to the identification of intact Bacillus endospores," Appl. Opt. 46, 3878-3890 (2007)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ao-46-18-3878

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