Abstract Six enzymes were tested against HMF and its oxidation intermediates to determine substrate specificity, product yield and pathways. A Michaelis–Menten kinetic mathematical model was constructed and some rate parameters… Click to show full abstract
Abstract Six enzymes were tested against HMF and its oxidation intermediates to determine substrate specificity, product yield and pathways. A Michaelis–Menten kinetic mathematical model was constructed and some rate parameters calculated. The best 2,5-diformylfuran (DFF) productivity was obtained with alcohol oxidase (AO) and 10.0 mM HMF, where 3.0 mM DFF was formed, followed by galactose oxidase (GO) and 10.0 mM HMF with a 0.5 mM DFF yield. Oxygen concentration in solution remained unchanged during processes. Substrate concentration affected only AO, where around 10 mol.% more DFF was formed with 5.0 mM HMF. The model was mostly in good agreement with single-enzyme reactions. Multi-enzyme reactions were used for model validation. The combination of AO and catalase was optimal, converting 10.0 mM HMF to 9.7 mM DFF. Small discrepancy between measured and modeled multi-enzyme reactions was observed due to the exclusion of the specific interactions in mechanisms.
               
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