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The Study on Vacuum Freeze Drying and Powdering Technology of Dictyophora Indusiata

Author: LiYueHua
Tutor: PanChaoRan
School: Fujian Agriculture and Forestry University
Course: Of Food Science
Keywords: Dictyophora Blanching Vacuum freeze-drying Ultrafine grinding
CLC: TS219
Type: Master's thesis
Year: 2011
Downloads: 72
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Abstract


Bamboo fungus crisp and refreshing, sweet and delicious, bacteria, known as \role of Jundeng. But dictyophora high water content perishable, is not conducive to storage and transport. Vacuum freeze-drying combined with the ultrafine grinding method will be processed into bamboo fungus powder, can effectively extend the shelf life, and can better retain the original dictyophora nutrients, but can also be dictyophora powder added to other foods to expand the scope of application of bamboo fungus. The the fresh dictyophora as experimental material on the vacuum freeze-drying the ultrafine grinding production dictyophora powder process has been systematically studied. Study to determine the the bamboo fungus freeze-drying and milling process in the blanching process, vacuum freeze-drying process and ultrafine grinding process. The main contents and conclusions are as follows: (1) blanching process to determine: blanch mainly inhibit the activity of the bamboo fungus peroxidase (POD), to prevent the occurrence of enzymatic browning reaction. Random combination of two factors test, study steam blanching conditions retention rate of total sugar and POD activity, identify good steam blanching process conditions: steam intensity of 2.5 Pa / g drift hot time of 2.0 min. (2) pre-freezing process to determine: determined on the eutectic point dictyophora, Determination of melting point, the the bamboo fungus eutectic point eutectic point -27 ℃ and -24 ° C; shop materials and by single factor experiment study thickness, pre-freezing temperature and pre-freezing time the dictyophora drying rate, on the basis of single factor further by orthogonal experiment to determine the optimal the dictyophora pre-freezing process parameters: pre-freezing temperature of -35 ° C, pre-freezing time 4 h, to shop material thickness of 12 mm. (3) The vacuum freeze drying process to determine: the saturated vapor pressure of the ice surface under different temperature table, identified by vacuum freeze-drying chamber operating pressure range of 10 Pa -39.99 Pa, on the basis of a single factor, the orthogonal test, through the test data range and variance analysis to determine the optimum the sublimation process conditions: working pressure of 30 Pa, sublimation temperature of 55 ° C, the cold trap temperature of -45 ° C; and to further define the parsing process parameters, but also the first single factor test to determine the range of parameters, after orthogonal test, analysis of variance and multiple comparison test results to determine the optimum analytical conditions were: working pressure to 25 Pa, resolve temperature of 65 ° C, resolution time of 3.5 h. (4) ultrafine grinding process to determine: on the basis of single factor test, ultrafine grinding process using quadratic orthogonal rotation combination test design, the the bamboo fungus polysaccharide dissolution rate Y mill speed X1, crushed the time X 2 , feeding quantity the X 3 of mathematical regression model to analyze the impact of ultrafine grinding parameters on powder polysaccharide, dictyophora, the dissolution rate optimization ultrafine grinding production The bamboo fungus powder optimum conditions: grinding speed of 5240 r / min, the grinding time of 9.2 min, the feeding amount to 39 g.

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