This work represented the production possibility of carrot-celery mixture powder with two-fluid atomizer spray dryer and process optimization. A carrot and celery juice were mixed in a ratio of 2:1 (w/w) and was sprayed. The operation variables were included inlet air temperature 120-170°C, maltodextrin concentration 0.7-0.9 (dry matter), and feed flow rate 36-53 (ml/min). Response surface methodology (RSM) was employed to investigate the effect of process variables on some product properties such as moisture content, water activity, hygroscopicity, dissolution time, color change, particle size, β-carotene, and bulk density. This responses were optimized by RSM models and face-centered central composite design. The optimum temperature, feed flow rate, and percentage of maltodextrin were 130 °C, 36 (ml/min), and 0.87 (w/w dry matter), respectively.

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