Figure 6
(a) Differential pulse volatmmogram for the stability of graphite electrode after 30 and 180 days in Britton–Robinson buffer solution (pH 4.0) containing 80.0 µM L-tryptophan (curves subjected to baseline correction); (b) bar diagram for the stability of graphite electrode (c) differential pulse volatmmogram for the repeatability (four consecutive measurements) of graphite electrode in Britton–Robinson buffer solution (pH 4.0) containing 80.0 µM L-tryptophan (curves subjected to baseline correction).
