Abstract:Spray drying processing of extracts from tomato stems and leaves were studied in this paper.Through the single-factor tests and orthogonal test, the optimal spray drying conditions were determined, that is: inlet flow rate of 300 mL/h, total solids content was 15%, maltodextrin dosage of 1.5:1, inlet temperature was 140℃. Among them, the inlet flow rate influence the effect of spray drying mostly. Under above conditions,loss of bacteriostatic activity was 12.3%, the output rate of product was 54.7%.