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. 2016 Sep 19;6(3):47. doi: 10.3390/bios6030047

Figure 2.

Figure 2

(Left) Raman of solid MTX (A) and SERS (BD) spectra of MTX (10 µM) in PBS solution (B), PBS-HSA solution (C), and diluted human serum (D). Light gray lines represent the background SERS signal due to the substrate itself; (Right) diagnostic plots from repeated double cross-validation (RDCV) of SERS data collected from PBS-HSA solutions (A) and diluted human serum (B). Reprinted with permission from [54].