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. 2014 Dec 17;4:7515. doi: 10.1038/srep07515

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Amperometric response of (a) S₁, S₂, S₃ and S₄ to successive additions of 0.1 mM AA at an applied potential of 0.15 V. (b) The corresponding calibration curves of (a). (c) S₃ to the additions of 100 nM AA at an applied potential of +0.15 V. (d) S₃ to successive additions of human serum (black trace) and Vitamin C tablet (red trace) contained 100 μM AA. Inset is the corresponding calibration curves of (d).