Question

A consumer states that his or her vegetable oil has a "funny" odor. The oil has...

A consumer states that his or her vegetable oil has a "funny" odor. The oil has been stored in a warm room for some time.

Explain what has happened to the oil and how it could have been prevented.  

Science   Chemistry   
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Answer #1

Oxidative rancidity has caused the oil to become rancid. The unsaturated bonds in the oil took up a molecule of oxygen. The process started with a free radical formation. This is an unstable compound with an unpaired electron. This free radical combines with two oxygen atoms to form a peroxide. Hydrogen is removed from another unsaturated fatty acid and attached to the peroxide to form a hydroperoxide. This reaction is self-perpetuating. Oxidative rancidity is accelerated by certain metals, light, and warm temperatures. Storage in tightly closed containers in a cool, dark place would slow the onset of oxidative rancidity. Antioxidants in the oil also protect against oxidative rancidity.

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