Food preservative is a chemical substance that is added to food products from preventing decomposition. It is classified into two categories:- chemical and physical.
Some of the chemical preservation are as:-
•Sorbates which includes potassium sorbate, calcium sorbate and sodium sorbate.
•Sulfites - there are different types of sulfite such as sodium sulfite, sodium bisulfite, sodium metabisulfite, potassium bisulfite.
Here are some physical preservative are as:-
•Vitamin E, (tocopherol)
•Vitamin C (ascorbic acid)
•Butylated hydroxyanisole (BHA) – It is used in in the preservation of butter,meats, etc.
•Butylated hydroxytoluene (BHT) –
•Disodium ethylenediaminetetraacetic acid (EDTA) – It is used for food processing
•Citric acid – It is found in citrus fruits.
Mostly chemical food preservatives are used for the preservation of items like methi thepla. If you apply then your food product life will increase. It is considered the best substance for food presevation. You can get easily it in the shop.