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Square wave (SW) voltammograms of MB (12.5 μM) recorded on cysteamine SAM modified electrode after different time of oligoG probe immobilization (black line – 20 min, red – 60 min, green – 120 min, blue – 180 min). SWV conditions: frequency of 100 Hz, amplitude of 0.04 V, step potential of 0.015 V in 50 mM phosphate buffer (pH 7.0) containing 5 mM KCl.
