Study of dynamics of glucose-glucose oxidase-ferricyanide reaction |
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Authors: | A Nováková L Schreiberová I Schreiber |
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Institution: | 1.Institute of Chemical Technology,Department of Chemical Engineering and Center for Nonlinear Dynamics of Chemical and Biological Systems,Prague,Czech Republic |
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Abstract: | This work is focused on dynamics of the glucose-glucose oxidase-ferricyanide enzymatic reaction with or without sodium hydroxide
in a continuous-flow stirred tank reactor (CSTR) and in a batch reactor. This reaction exhibits pH-variations having autocatalytic
character and is reported to provide nonlinear dynamic behavior (bistability, excitability). The dynamical behavior of the
reaction was examined within a wide range of inlet parameters. The main inlet parameters were the ratio of concentrations
of sodium hydroxide and ferricyanide and the flow rate. In a batch reactor we observed an autocatalytic drop of pH from slightly
basic to medium acidic values. In a CSTR our aim was to find bistability in the presence of sodium hydroxide. However, only
a basic steady state was found. In order to reach an acidic steady state, we investigated the system in the absence of sodium
hydroxide. Under these conditions the transition from the basic to the acidic steady state was observed when inlet glucose
concentration was increased. |
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