Abstract
The aim of this study was to optimize the spray drying process for beetroot juice. Influence of feed flow rate (8, 10 and 11mL/min), processing temperature (140, 150 and 160°C) and maltodextrin concentration (20, 25, and 30%) on packed bulk density, moisture content and betalain content of beetroot powder were assessed using response surface methodology. The following optimum process parameters were determined; feed flow rate feed flow rate of 10mL/min, processing temperature of 149°C and maltodextrin concentration of 20%. The predicted values for packed bulk density, moisture content and betalain content were 0.62g/mL, 6.12 and 33.84mg/100g of dry matter, respectively. Within the optimum parameters, the experimental values for packed bulk density, moisture content and betalain content were 0.62±0.1g/mL, 6.10±0.1 and 33.14±0.1mg/100gm of dry matter. The similarity of the experimental results to the predicted values verified the models.
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