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Analytical and Bioanalytical Chemistry

, Volume 411, Issue 21, pp 5563–5576 | Cite as

Development of uncoated near-spherical gold nanoparticles for the label-free quantification of Lactobacillus rhamnosus GG by surface-enhanced Raman spectroscopy

  • Elie AkannyEmail author
  • Anne Bonhommé
  • Carine Commun
  • Anne Doleans-Jordheim
  • François Bessueille
  • Sandrine Bourgeois
  • Claire Bordes
Research Paper

Abstract

The Surface-enhanced Raman spectroscopy (SERS) method based on gold nanoparticles as SERS substrate was investigated for the label-free detection and quantification of probiotic bacteria that are widely used in various pharmaceutical formulations. Indeed, the development of a simple and fast SERS method dedicated to the quantification of bacteria should be very useful for the characterization of such formulations in a more convenient way than the usually performed tedious and time-consuming conventional counting method. For this purpose, uncoated near-spherical gold nanoparticles were developed at room temperature by acidic treatment of star-like gold nanoparticle precursors. In this study, we first investigated the influence of acidic treatment conditions on both the nanoparticle physicochemical properties and SERS efficiency using Rhodamine 6G (R6G) as “model” analyte. Results highlighted that an effective R6G Raman signal enhancement was obtained by promoting chemical effect through R6G-anion interactions and by obtaining a suitable aggregation state of the nanoparticles. Depending on the nanoparticle synthesis conditions, R6G SERS signals were up to 102–103-fold greater than those obtained with star-like gold nanoparticles. The synthesized spherical gold nanoparticles were then successfully applied for the detection and quantification of Lactobacillus rhamnosus GG (LGG). In that case, the signal enhancement was especially due to the combination of anion-induced chemical enhancement and nanoparticle aggregation on LGG cell wall consecutive to non-specific interactions. Both the simplicity and speed of the procedure, achieved under 30 min, including nanoparticle synthesis, sample preparation, and acquisition of SERS spectra, appeared as very relevant for the characterization of pharmaceutical formulations incorporating probiotics.

Graphical abstract

Keywords

Surface-enhanced Raman spectroscopy Lactobacillus rhamnosus Rhodamine 6G Gold nanoparticles 

Notes

Acknowledgments

The authors gratefully acknowledge Carole Farre from the Institute of Analytical Sciences for providing TEM images.

Compliance with ethical standards

Conflict of interest

The authors declare that there is no conflict of interest.

Supplementary material

216_2019_1938_MOESM1_ESM.pdf (326 kb)
ESM 1 (PDF 325 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Institut des Sciences Analytiques, UMR 5280, CNRS, ENS LyonUniversité Lyon 1, Université de LyonVilleurbanneFrance
  2. 2.CNRS, LAGEPP UMR 5007Univ Lyon, Université Claude Bernard Lyon 1VilleurbanneFrance
  3. 3.Equipe de Recherche Bactéries Pathogènes Opportunistes et Environnement, UMR CNRS 5557 Ecologie MicrobienneUniversité de Lyon 1 & VetAgro SupVilleurbanneFrance
  4. 4.Laboratoire de Bactériologie, Institut des Agents Infectieux, Centre de Biologie et Pathologie NordHospices Civils de Lyon (HCL)LyonFrance
  5. 5.ISPB-School of PharmacyUniversité Lyon 1, Université de LyonLyonFrance

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