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CBSE - VIII
Food Preservation
Food Preservation
Food poisoning may cause infection.We need to store our food properly as food poisoning can cause serious illness and even death.Spoiled food emits a bad smell, has a bad taste and changes colour.Chemical methods of preservation of jams and squashes use preservatives like sodium benzoate and sodium metabisulphite.Common salt absorbs moisture from food, making it dry and uninhabitable for microbes.Sugar reduces moisture in food, which inhibits the growth of microbes that spoil food. Jams, jellies and squashes are preserved using sugar.Bacteria and fungi cannot live in an environment of oil and vinegar.Louis Pasteur discovered the process of pasteurisation.During pasteurisation, milk is first heated to about 70 degrees Celsius for 15 to 30 seconds and then suddenly chilled.Sudden chilling of milk is done during pasteurisation to prevent the growth of microbes.Boiling and freezing are the two other methods used to preserve food.
