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. 2016 Oct 21;9(10):857. doi: 10.3390/ma9100857

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© 2016 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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(A) Electrochemical impedance spectroscopy (EIS) of the bare electrode (curve a) and peptide/6-mercapto-1-hexanol (MCH)-modified electrode before (curve b) and after incubation with AuNPs (curve c) or AuNPs/peptide (curve d). Curve e corresponds to that after incubation with DPP-IV only. Curve f corresponds to that of incubation with AuNPs/peptide following the incubation with DPP-IV. The final concentrations of AuNPs, peptide and DPP-IV were 1.8 nM, 0.4 μM and 5 mU/mL, respectively; (B) SEM images of peptide/MCH-modified electrode incubated with AuNPs/peptide before (panel a) and after treatment (curve b) by DPP-IV.