Figure 2 | Scientific Reports

Figure 2

From: Electrochemical determination of L-tryptophan in food samples on graphite electrode prepared from waste batteries

Figure 2

(a) Differential pulse voltammetry curves of 100.0 µM L-tryptophan on graphite electrode in Britton–Robinson buffer solution at different pH values, scan rate 50.0 mV/s (curves subjected to baseline correction); (b) Dependence of the peak potential of 100.0 µM L-tryptophan on pH value of the Britton–Robinson buffer solution; (c) Dependence of current peak of 100.0 µM L-tryptophan on pH value of the Britton–Robinson buffer solution.

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