The Study On The Production Of Tomato And Carrot Compound Powder By The Spray Drying Technology

Tomato and carrot contain abundant nutritional substance. Lycopene and β-carotene which are the key studies in the international at present have an obvious effect on anti-cancer. There are a lot of problems in the production of the tomato powder by the technology of spray drying at these days. We usually adopt traditional technology in the production of carrot which exist considerable disadvantages in the taste, shape and ingredients of nutrition. The technology of spray drying on the production of carrot has not been reported at present.The index of output and carotenoid of the general kinds of tomatoes and carrots planted in the northern areas had been valued. The tomato adopted is the kind of Holland baili. We took the carrot called chrysoidine number 1 which was bred by the vegetable and flower research institution of the Agricultural Science Academe as the proceeding object.By the studies in the antioxidant protection on the main gradients of nutrition and the production of tomto and carrot compound powder by the spray drying technology in this paper we had decided the optimum processing conditions.The optimum broken temperature of the tomato had been confirmed by determining the impact of broken temperature on the activity of pectous enzyme and the solvency of the product. Carrots were intenerated to passive the enzyme system and expel air to prevent oxidation and to make the tissue soft for crushing. The temperature was chosen as 85℃,90 ℃,95℃and 100℃ respectively in the single factor contrastive experiment. We took the loss rate of carotenoid as the index to confirm the shortest time which was needed to intenerate the tissue in different temperatures.Antioxidants were added in the processing of tomato brokenness and carrot' tissue softness, among which Vc was regarded as the nutritional fortifier at the same time. The adding amounts of the antioxidants were determined by adding NaHSO₃ and Vc in the single factor contrast trials. The range adding amounts of NaHSO₃ was 0.25⁰.35g/kg and Vc was 0.27 0.33g/kg.In the process of mixed preparation for plasm, the ratio of the tow raw materials affected the color of the mixed plasm, degree of wall hanging in the process of spraying and the yield of the product. The ratio of tomato to carrot was 6:4 which was verified by the contrastive trial.The pH of the mixed plasm also had an influence on the product. After confirming therange of pH was 3.0³.4,The technical parameters were determined by the orthogonal experiment which took NaHSO3, Vc and pH as three factors. The adding amount of NaHSO3 was 0.30g/kg, Vc 0.33g/kg, pH was 3.2.Embedding reagent influenced the effect of the embedment of raw materials, by the single factor experiment , the amount of maltodextrin was 40% and The ratio of maltodextrin to Beta-link dextrin determined was 5:1.Select the range of isotropic pressure was 0⁴0Mpa,analysis the solubility,the remain of the nuturance of the product, confirmed the isotropic pressure was 25Mpa, And two times.Through the single factor and orthogonal experiment with three factors four levels, the main technical parameters of spray drying were determined. The intake temperature was 130°C, the wind speed was 1.0 m3 ? min"1, the injection pressure was 190kpa, the feeding amount was 4 X 180ml/h.