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(A-B) Original and (C-D) background subtracted CVs recorded at a CDH variant E501C modified GC/MWCNT electrode in argon-saturated 50 mM acetate buffer (pH 5.5), containing 30 mM CaCl2 (black), after the addition of 50 mM glucose (blue) and the addition of 20 μM ferrocene (red). The CVs were recorded (A-C) before and (B-D) after the papain treatment, sweeping the potential at 2 mV/s.
