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以胡萝卜、大豆为主要功能原料,采用喷雾干燥法生产冲溶性良好的固体饮料,对胡萝卜和大豆制汁(浆)的喷雾干燥最佳工艺条件以及加工过程中营养成分损失和产品保存等进行了研究。最优工艺参数为:进风温度250℃,进料总固形物含量9%,进料速度25mL/min,喷头压力0.35MPa。胡萝卜素保存率和产品的水分含量与进风温度,进料速度,喷头压力显著相关。 相似文献
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为了改善合成维生素E醋酸酯干粉的喷雾干燥效果,优化喷雾干燥工艺,主要研究了进风温度、进风频率、雾化器频率和进料频率的变化对合成维生素E干粉喷雾干燥效果的影响,并采用正交试验优化喷雾干燥条件,分析进风温度、进风频率、雾化器频率和进料频率的变化对产品的收率、产品品质的影响。结果显示:当进风温度为180℃、进风频率为60HZ、雾化器频率为40HZ,进料频率为40HZ时,产品得率最高,达96.5%,所制备的合成维生素E醋酸酯干粉的水分含量为3.5%,粒度主要分布在40~80目之间。 相似文献
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响应面法优化金银花真空远红外辐射干燥工艺 总被引:2,自引:0,他引:2
以金银花为干燥对象,进行真空远红外辐射干燥试验。通过二次回归正交试验,建立干燥速率和物料中绿原酸含量与辐射板温度、干燥室压力和物料量之间的数学模型,并进行方差分析。通过响应面分析,研究各干燥参数对干燥速率和绿原酸含量的影响情况。结果表明:回归模型具有良好的拟合性;对干燥速率和绿原酸含量的影响显著性顺序均为辐射板温度>物料量>干燥室压力;干燥速率随着板温的升高、压力的下降和物料量的减少而上升,绿原酸含量随着压力的下降和物料量的减少而上升,随着板温的升高,绿原酸含量先缓慢上升后下降。 相似文献
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以鲜洋葱为原料,研究平均干燥温度、履带速率、进料速率对洋葱五层网带式热风干燥效果的影响。在单因素实验的基础上,采用Box-Behnken实验,以平均干燥温度、履带速率、进料速率为影响因素,以含水量、干燥得率、光学指数综合评分为响应值建立二次回归方程。结果表明,对洋葱粒综合评分的影响大小顺序为干燥温度>履带速率>进料速率,得到最佳生产工艺参数为干燥温度70℃、履带速率10 cm/min、进料速率1200 kg/h,在此条件下,综合评分结果为82.02,与理论值82.32相差较小,优化结果可靠。 相似文献
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玉米膨化食品加工参数研究 总被引:7,自引:2,他引:7
以玉米糁为材料,采用DSE-25型双螺杆挤压膨化实验室工作站为加工设备,分析了加工温度和物料含水量对扭矩、压力、膨化率和产品含水量的影响。结果表明,在试验设计的加工温度和物料含水量范围内,加工温度和物料含水量对螺杆扭矩、第4区压力、第5区压力、产品膨化率和含水量都有极显著影响。加工温度对第4区压力影响较大;物料含水量对扭矩、第5区压力、产品膨化率和含水量影响较大。随着加工温度上升,物料含水量增加,扭矩、压力、产品膨化率降低;随着加工温度升高,物料含水量下降,产品含水量降低。 相似文献
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应用喷雾干燥技术制备雏生素A微胶囊,以进风温度、出风温度,第一次均质压力和第二次均质压力为自变量,以微胶囊化效率、产率、贮藏保留率为评价指标,利用模糊数学的理论和方法处理实验数据,以模糊综合评价值为目标函数对喷雾工艺参数进行优化,确定了最佳工艺参数。 相似文献
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研究了以阿拉伯树胶和麦芽糊精为壁材 ,喷雾干燥法制备微胶囊化肉桂醛的工艺条件 .探讨了壁材组成、乳化剂用量、固形物质量分数、芯壁比、进风温度、进料速度、喷射压力等对微胶囊化效果的影响 .经过正交试验 ,确定了最佳工艺条件 .实验结果表明 ,阿拉伯胶和麦芽糊精的最佳质量配比为 1∶1,蒸馏单甘酯的用量为 0 .4 g/dL ,固形物质量分数为 4 0 % ,芯材与壁材的配比为 1mL∶10 g ,肉桂醛微胶囊化的最佳喷雾干燥条件为进风温度 2 2 5℃ ,进料流量 2 10mL/h ,喷射压力0 .18MPa .实验还表明 ,肉桂醛微胶囊产品有一定的缓释抑菌效果 . 相似文献
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ABSTRACT— The cooling effectiveness during pneumatic transport of a spray-dried food product has been investigated. Differential equations which describe the product and air temperatures as a function of distance from the initial mixing point have been derived and solved. The predicted results have been compared to experimental data obtained in a conveying tube equipped with thermocouples. The results indicated the equilibrium temperature of the air-product mixture could be predicted and was a function of loading ratio. Increased loading ratio decreased the distance required to reach the equilibrium temperature. The effectiveness of product cooling after reaching the equilibrium temperature was a function of conditions at the conveying tube wall. Results indicated that a water spray over the exterior surface was more effective than forced-air circulation which, in turn, was more effective than natural air circulation. 相似文献
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S. Ambros S. A. W. Bauer L. Shylkina P. Foerst U. Kulozik 《Food and Bioprocess Technology》2016,9(11):1901-1911
Freeze drying is one important step in downstream processing of probiotics and starter cultures production and requires a long duration of the drying step, which, therefore, often is the overall production bottleneck. Microwave accelerated vacuum drying already showed promising results in terms of product quality for various food products. However, poor information on drying microorganisms by microwaves is available. The aim of this work was to set up a suitable microwave-vacuum drying process for the conservation of lactic acid bacteria and to investigate the optimum process parameters to achieve dried cultures with high survival and activity. The probiotic Lactobacillus paracasei ssp. paracasei F19 was used as model strain. The influence of the process parameters chamber pressure (7–30 mbar), specific microwave power input (1–5 W/g), and maximum product temperature (30–45 °C) on the main quality parameters survival rate, metabolic activity, and water activity of the dried samples were analyzed. Continuous energy input was shown to act detrimentally to the cells due to extreme temperature rise in the second drying stage. Proper temperature regulation could be obtained by pulsed microwave input according to a maximum set temperature. Intermediate microwave power between 3 and 4 W/g, the lowest tested pressure level of 7 mbar and low product temperatures of 30–35 °C, resulted in the highest survival and activity of the bacterial cells. With these results, it could be shown that microwave-vacuum drying appears as a promising alternative drying technique for the preservation of starter and probiotic cultures. 相似文献