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The present study deals with the application of glucose oxidase (GOX) for the production of metal gluconates by fermentation method. It provides a method for the conversion of glucose into gluconic acid and its derivatives using the enzyme glucose oxidase (GOX). Due to the presence of calcium carbonate in fermentation medium the gluconic acid is converted into calcium gluconate. Conditions like concentration of substrate, temperature, pH, fermentation period and different phosphate sources were optimized during fermentation. The maximum GOX activity was observed at 35°C (pH 5.5) after 44 h of incubation at 100 rpm. At the maximum enzyme activity, the percentage yield of gluconates are also maximum; both go side by side. Sulphuric and oxalic acids method were employed for the production of gluconic acid. Derivatives of gluconic acid that is, calcium lactate gluconate, sodium gluconate, potassium gluconate, zinc gluconate and copper gluconate were formed by using double displacement and direct methods. The direct method gave the better yield. The percentage yields were 73, 89.63, 81.93, 92.86 and 81.53%, respectively.  Keywords: Glucose oxidase (GOX), metal gluconate, double displacement.

Application of glucose oxidase for the production of metal gluconates by fermentation