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Enzymatic biosensor using cytochrome C3 as the recognition element. Upon exposure to chromate [Cr (VI)], electrode-immobilized cytochrome C3 reduces Cr (VI) to Cr (III). The current produced by the electrochemical regeneration of reduced cytochrome C3 is proportional to the amount of oxidized cytochrome C3 and, therefore, the Cr (IV) concentration. Ripp et al. [24].
