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Cyclic voltammograms of (a) 400 μM CHP at the surface of MWCNTPE; (b) 400 μM CHP at the surface of CPE in the presence of 200 μM Hcy; (c) 400 μM CHP at the surface of MWCNTPE in the presence of 200 μM Hcy; (d) 200 μM Hcy at the surface of MWCNTPE; (e) MWCNTPE in the buffer solution. Conditions: 0.04 mol L−1 universal buffer (pH 4.0), scan rate of 20 mVs−1.
