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The purpose of this study was to determine the optimum spray drying conditions of soft persimmon latte using response surface methodology that is a statistical procedure used for optimization studies. A central composite design was applied to investigate the effects of independent variables, inlet temperature (X 1 ), air flow rate (X 2 ), and feed flow rate (X 3 ), on responses such as yield, water absorption index, and total phenolic compounds. Statistical analysis revealed that independent variables significantly affected all the responses. A maximum yield of 8.11 g was obtained at 90℃ of X 1 , 51.82 mL/min of X 2 and 7.00 mL/min of X 3 . A minimum water absorption index of 0.58 was obtained at 101℃ of X 1 , 60.00 mL/min of X 2 and 17.00 mL/min of X 3 . A maximum total phenolic compounds of 298.02 μg/mL was obtained at 90℃ of X 1 , 43.33 mL/min of X 2 and 17.00 mL/min of X 3 . In conclusion, the best spray drying conditions were as follows: X 1 , 90℃; X 2 , 53 mL/min; X 3 , 17 mL/min. Under those optimal conditions, the powder's yield (7.46 g), water absorption index (0.54), and the content of total phenolic compounds (294.75 μg/mL) were estimated.

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