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. Author manuscript; available in PMC: 2016 Mar 7.
Published in final edited form as: Analyst. 2015 Jan 19;140(5):1516–1522. doi: 10.1039/c4an01980f

Figure 2.

Figure 2

Averaged SERS spectra of Angiotensin I at concentrations ranging from 50 μM to 50 nM. The inset (plotted in a linear scale) is a plot of the area of the band at 1547 cm−1 assigned to the amide II vibration as a function of Angiotensin I concentration. Error bars in the inset represent the standard deviation.