Evanescent-field-induced Raman scattering for bio-friendly fingerprinting at sub-cellular dimension

Boris Snopok*, Denys Naumenko, Elena Serviene, Ingrida Bruzaite, Andrius Stogrin, Juozas Kulys, Valentinas Snitka

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Evanescent field induced chemical imaging concept has been realized in analytical platform based on the μ-tip-enhanced Raman scattering spectroscopy (μ-TERS). The technique aimed to minimize thermal decomposition of dried biological sample as the result of huge concentration of optical field near the tip by increasing the size of an aperture-less "excitation source". μ-TERS technique is similar to classical biosensor systems based on propagating surface plasmon resonance phenomenon but with sensitive elements a few micrometers in size that can be targeted to the area of interest. The utility of the concept is exemplified by the analysis of dried single cell envelope of genetically modified Saccharomyces cerevisiae yeast cells, which do not have any heat-removing pathways, by water as in the case of the living cell. Practical excitation conditions effective for μ-TERS Raman observation of single layer dried biological samples without photodamage-related spectral distortion have been determined - the allowable limit is above 30 s at 13 μW/μm2. Finally, potential of μ-TERS spectroscopy as new bio-friendly instrumental platform for chemical fingerprinting and analytical characterization of buried nanoscale features is discussed.

Original languageEnglish
Pages (from-to)414-421
Number of pages8
JournalTalanta
Volume128
DOIs
Publication statusPublished - 1 Oct 2014
Externally publishedYes

Keywords

  • Atomic force microscopy
  • Cellular envelope
  • Dried biological samples
  • Evanescent wave
  • Raman scattering
  • Surface plasmon resonance
  • Tip enhanced Raman spectroscopy
  • Yeast cell
  • μ-TERS

ASJC Scopus subject areas

  • Analytical Chemistry

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