PR-water activity and dehydration -大昌华嘉,激光粒度仪,接触角测量仪,表面/界面张力仪,旋光仪,密度仪,全自动进样器,折光仪,全自动氨基酸分析仪,Zeta电位及纳米粒度仪,比表面和孔隙度分析仪,薄层色谱扫描仪,总有机碳(TOC)分析仪,元素分析仪,水分活度仪,火焰光度计/氯离子分析


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PR-water activity and dehydration 发布时间:2014/05/27 13:44:11

Water activity is defined as the current volume and availability of “free” water in a sample and should not be directly compared with the water content (g water/ g substance). The water activity is given as the aw – value and ranges between 0 (absolute dryness) and 1 (condensed humidity). Only this component takes an active part in the exchange with the ambient humidity and can possibly form the ideal medium for microbiological growth on the surface which influences the microbiological stability. The water activity also has an important effect on the chemical reactions in food.