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Square wave voltammograms of (a) beta-carotene and (b) equivalent volume of Tween 20 using a β-cyclodextrin modified electrode loaded with MB at low, nanomolar concentrations. The two SWV look similar because both are measuring the elution of MB. (c) The calibration curves of the beta-carotene and blank Tween 20 control indicate that the measurement is primarily Tween 20 solubilizing the MB.
