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. 2022 Apr 28;365:131974. doi: 10.1016/j.snb.2022.131974

Fig. 4.

Fig. 4

The SERS detection of simulated nasal / throat swabs and classification of nasal / throat swabs. (a) The Raman spectra of simulated nasal swabs with different viral loads from 1300 copies/mL to 100 copies/mL. (b) The Raman spectra of simulated throat swabs with different viral loads from 1300 copies/mL to 100 copies/mL. (c) The mapping of Raman spectra for simulated nasal swabs with 60 copies/mL viral loads. (d) The mapping of Raman spectra for simulated nasal swabs (100 copies/mL, bule lines) and negative throat swabs (red lines). (e) the predicted model by SVM linear kernel function for simulated throat and nasal swab (100 copies/mL). Value 1 is a prediction as positive swabs solution and value 2 is a prediction as negative swabs solution.