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. 2016 Dec 21;409(6):1555–1567. doi: 10.1007/s00216-016-0090-z

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© The Author(s) 2016

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 5 — SERS spectra of Salmonella Typhimurium, L. monocytogenes, and C. sakazakii (a). Loadings plot of the first principal component showing the most prominent marker bands and b plot of the PC-1 versus PC-2 for the selected marker band at 650 cm⁻¹ (c). Asterisks represent the scores calculated for test samples (smoked salmon—Salmonella spp., ham—L. monocytogenes, and powdered infant formula—Cronobacter spp.)