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Fig. Fresh oil & Rancid oil Fig. Rancid Pizza

Example-
a. When butter is kept open for a long time then its smell and tastechanges.
This butter is known as Rancid Butter.
b. Fried chips & snacks acquire a foul smell & a bitter taste when left
exposed to air for a long time.
c. When Pizza/bread is left exposed to air for a longer period, it develops
molds and turns Rancid.

Methods of preventing Rancidity-
a. Adding antioxidants (substances which prevent oxidation) to food.
b. Storing food in airtight containers to slow the process of rancidification.
c. Refrigerating food also helps to slow down rancidification.
d. Flushing food packets with Nitrogen (inert gas at room temperature)
before sealing.

Fig. Storing food in airtight containers Fig. Food packets flushed with Nitrogen

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