Few situations and places where food preservation is required are as follows:
Considering all the harvests got every year, finding ways to store and preserve them to serve people for a longer duration is essential. People will use this stored harvest in troubled times, like during a famine.
Some vegetables and fruits like mangoes or carrots are available only for one season. To consume these products all year round, they are preserved by the farmers.
Food is required to be transported or shifted from one place to another. During this time, it can get spoilt. Therefore, the food items are preserved beforehand.
Now, coming to domestic uses, people take up preservation to increase the shelf life of a few items.
Food preservation techniques
There are many modern and ancient methods of food preservation. Some of them are given as follows:
Freezing: Considered to be one of the easiest and the oldest preservation methods. This method affects the activity of enzymes by slowing them down, which increases the shelf life of the products.
Sugaring: In this process, the food to be preserved is first wholly dehydrated and then covered with sugar. The sugar-packing makes it hard for the growth of microbes.
Fermentation: One of the oldest methods, including the breakdown of carbohydrates using yeast and some bacteria. This process is known to improve the quality of food.
Pasteurization: Method used explicitly for liquid food items like milk. Heat is provided to a specific temperature which helps in the killing of the bacteria.
Vacuum packing: It is commercially used where items are packed in plastic. The air from the packaging gets removed altogether, preventing the growth of aerobic bacteriaâ€”the method usually used during packaging meat.
Irradiation: Food items are exposed to radiation, usually by gamma rays, X-rays, or electron beams. When applied in high concentrations, it kills and inhibits the growth of bacteria, hence preserving the food.
Dehydration: The microorganisms which need an aqueous medium for their growth are stopped by this method. All the water is removed from food products making it less favorable for the bacteria.
Preservatives: Again, the basic principle of preservatives is the same, they stop microbial growth. There are two types of preservatives present which are added in food, artificial and natural. Some natural preservatives include sugar (sugaring), oil, and salt. Artificial preservatives like vitamin C or BHA (butylated hydroxyanisole) are added in packed food items like juices or jams. These added preservatives can have many harmful effects on the body when consumed. Diseases like cancer (conversion of nitrates or nitrites present in preservatives to carcinogens) or heart problems (weakening of heart tissues) can arise due to excessive intake of preservatives.
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