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. 2013 Jun 7;13(6):7492–7504. doi: 10.3390/s130607492

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© 2013 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 license (http://creativecommons.org/licenses/by/3.0/).

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Figure 6. — Cyclic voltammograms for Hb/GNPs-GR-SDS/BPG modified electrode at scan rate 0.1 V⁻¹ in buffer solutions at different pH values. pH value(from A to E): 5, 6, 7, 8 and 9.