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. 2019 Nov 29;9:17922. doi: 10.1038/s41598-019-54380-y

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Dependence of SERS signal intensity ratio and TET concentration (n = 3). (a) Correlation between ratio 455 cm⁻¹/1280 cm⁻¹ versus analyte concentration in logarithmic scale. Linear correlation y = −0.124ln(x) + 1.0154; R² = 0.9738). (b) Correlation between ratio 1320 cm⁻¹/1669 cm⁻¹ versus analyte concentration in logarithmic scale. (c) Correlation between ratio 874 cm⁻¹/1397 cm⁻¹ versus analyte concentration in logarithmic scale. Diamond marker shows the ratio values obtained for milk samples without TET and grey shade the error (standard deviation). Each point in the final calibration curve corresponded to the mean value and the error bars to the standard deviation of three independent measurements.