| 摘要 |
PURPOSE:To extremely reduce the number of bacteria and to freeze a food without change of appearance, taste, etc., of a food by using a rapidly freezing device of refrigerant circulation type and immersing the food in a refrigerant composed of an aqueous solution of ethyl alcohol containing an organic acid (salt). CONSTITUTION:A food such as ham is precooled at 5 deg.C for 24 hours, immersed in a refrigerant composed of an aqueous solution of ethyl alcohol containing an organic acid (e.g. lactic acid) and/or its salt at 0.8-1.5m/sec flow rate in a rapidly freezing device of refrigerant circulation type and frozen so that viscosity will not rise at low temperature of the refrigerant, negative aspects of mild freezing are improved, facilities are efficiently run, time required for freezing is shortened, the number of bacteria attached to the food is extremely reduced and the food is frozen without changing physical properties such as appearance and taste of food, The content of the organic acid or its salt is preferably 0.01-15w/w% and the content of the alcohol is preferably 50-90v/v. |
