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水分活度:(Water Activity)一种食品的平衡蒸气压与相同温度下纯水的饱和蒸气压的比值。
物中的水在同一温度下产生的水蒸气压力与纯水的水蒸气压力的比值。在食品加工过程中控制适当的水分活力对于延长其贮存时间具有重要意义。多数细菌在水分活力低于0.9的食物中均不能生长;酵母在水分活力低于0.85的食物中不能生长;霉菌在水分活力低于0.7的食物中不能生长。脱水食品的水分活力低于0.6,有利于抑制微生物的生长繁殖。
The water in content leaves the specific value of the vapor pressure of the vapor pressure of generation and pure water in same temperature. Proper moisture vigor is controlled to have important sense to extending time of its keep in storage in food treatment process. Most bacterium divides vigor in water under all cannot grow in the food of 0.9; Yeast divides vigor in water under cannot grow in the food of 0.85; Mould divides vigor in water under cannot grow in the food of 0.7. The moisture vigor of dehydration food under 0.6, be helpful for restraining microbial growth to breed.
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