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. Author manuscript; available in PMC: 2014 Mar 21.
Published in final edited form as: Analyst. 2013 Mar 21;138(6):1665–1673. doi: 10.1039/c2an36478f

Fig. 2.

Fig. 2

SERS (black) and TERS (blue) spectra of native insulin with suppressed amide I bands (—) and with detectable amide I bands (---). For SERS, insulin was mixed with gold nano-particles and laser excitation at λ =785 nm was used. For TERS a silver island coated AFM tip and excitation at λ =532 nm was used.