Question

What type of substance is used to prevent rancidity??

Answer 1

Fats and oils undergo certain undesirable changes during storage which result in spoilage. The major spoilage of fats and oils is rancidity.

 
Synthetic antioxidants like butylated hydroxy anisole (BHA), butylated hydroxy toluene (BHT) and propylgallate can be added to prevent rancidity.

Naturally occurring antioxidants like vitamin C, b carotene and vitamin E protect against rancidity.
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Answer 2

Antioxidants like Vitamin A and C breaks the contact of oxygen and the food which prevent rancidity. Even species like Sage prevents rancidity. Nitrogen gas is also flushed in packets of chips because it is an inert gas which also prevents rancidity.