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. Author manuscript; available in PMC: 2018 Dec 1.
Published in final edited form as: Rev Anal Chem. 2017 Jul 5;36(4):20160037. doi: 10.1515/revac-2016-0037

Figure 2.

Figure 2

SERS spectra of thiolated poly A adsorbed on on AuNPs aggregated with MgSO4 at concentrations (a)–(e) 10−4 – 10−8 M and unthiolated poly A at 10−5 M (f). The diagram represents that unthiolated DNA can reduce the overwhelming adenine signal at 736 cm−1 through the reorientation of the DNA on metal surface, with weaker adenine bands shown in the SERS spectra. Reproduced from Ref. 49 with permission of The Royal Society of Chemistry.