共查询到11条相似文献,搜索用时 78 毫秒
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哈密瓜汁对热敏感,为了减少因热处理导致的营养成分和风味物质的损失,采用无机陶瓷膜对哈密瓜汁进行微滤除菌。通过研究三种孔径膜的膜通量、微滤前后哈密瓜汁营养成分的变化及除菌效果,选择最适的膜孔径,并在此基础上选择最适的操作压力和进料温度,从而确定最佳的微滤除菌工艺参数。结果表明:最佳的工艺参数为膜孔径0.2μm,操作压力0.2MPa,进料温度25℃。在此条件下处理的哈密瓜汁透光度可达98.8%,浊度为2.61NTU,菌落总数为13CFU.mL-1,其中大肠菌群、霉菌、酵母菌均未检出。 相似文献
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Clarification and sterilization of raw depectinized apple juice by ceramic ultrafiltration membranes
Jun Li Zhengfu Wang Yiqiang Ge Qingfu Sun Xiaosong Hu 《Journal of the science of food and agriculture》2006,86(1):148-155
Raw depectinized apple juice was clarified and sterilized in a cross‐flow pilot scale ultrafiltration system using ceramic tubular membranes (MEMBRALOX®, Pall) with mean pore size of 100 nm. The permeate flux significantly decreased with time until a steady‐state was established. An increase in filtration pressure increased the permeate flux while there is an optimum pressure (about 0.85 bar) above which the increase of pressure does not increase the flux significantly. The higher the cross‐flow velocity was, the higher was the transmembrane flux. When the operating temperature increased, the permeation rate increased subsequently. Analytical measurement showed that suspended solids and turbidity could almost be removed by the ceramic ultrafiltration membrane, but pH, acidity, sugar and soluble solid content of the juices showed no significant change. The bacteria challenge tests with Micrococcus flavus showed that the logarithm value of the bacteria reduction rate came up to above 9 in the cross‐flow tubular ceramic system. When the permeate was collected in sterile bottles in a laminar flow shell and kept at 4 °C, 8 °C, 25 °C and 35 °C, for 28 days, the apple juice experienced minimal changes in physicochemical properties at lower temperatures of 4 °C, or 8 °C. Copyright © 2005 Society of Chemical Industry 相似文献
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无机陶瓷膜在茶油精炼中的研究 总被引:1,自引:0,他引:1
目的:为解决传统油脂精炼方法存在的问题,研究无机陶瓷膜技术在油脂精炼中的应用。方法:从无机陶瓷膜的截留分子量、压力、温度和混合油浓度研究磷脂、色泽、酸价和膜通量的影响。结果:最佳膜技术处理工艺条件为陶瓷膜2万、压力0.3MPa、温度40℃、混合油浓度50%,经过处理,磷脂含量降到6.86mg/kg,色泽为Y5.2(25.4mm比色槽),酸价为0.63。结论:无机陶瓷膜技术应用到油脂精炼中,可简化油脂精炼工艺、减少能耗、降低生产成本、节省脱色吸附剂的用量,达到脱胶、脱酸和脱色的目的。 相似文献
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通过无机陶瓷膜进行大豆混合油净化的研究,结果表明:选择30~100 nm无机陶瓷膜,在大豆混合油体积分数27.5%、温度43~50℃、真空0.07 MPa条件下,膜通量为562~1 178 L/(m2·h),除杂效果明显,除杂率达100%;100 nm孔径的无机陶瓷膜反洗通量衰竭较快,并有堵塞现象,不宜用于大豆混合油的净化;30 nm孔径的无机陶瓷膜与50 nm孔径的相比,膜通量小,投资增加,50 nm孔径的无机陶瓷膜过滤具有较合适的效果。 相似文献
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采用孔径为200nm、450nm、800nm的无机陶瓷膜过滤酱油,除去其中的大分子蛋白质及菌体,以澄清酱油消除二次沉淀现象。研究了不同孔径的无机陶瓷膜处理酱油,膜通量与过滤温度、过滤时间、操作压力及流速的关系,确定了选用200nm的陶瓷膜、操作温度在30℃、操作压力为0.20MPa过滤酱油可以解决酱油的二次沉淀现象,并可获得较高的膜通量。 相似文献
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