Discussion
Consider the following statements about oil quality indices:
1. Free fatty acid indicates hydrolytic deterioration.
2. Iodine value indicates the degree of unsaturation.
3. Peroxide value rises indefinitely as oxidation proceeds.
Which of the statements given above is or are correct?
Answer: A
Correct answer: 1 and 2 only
The first two are correct. Free fatty acid content records hydrolysis of the triglycerides, and iodine value measures unsaturation by the mass of iodine adding across the double bonds.
The third is wrong on the chemistry. Hydroperoxides are unstable and decompose into aldehydes and ketones, so peroxide value rises, peaks and then falls as oxidation proceeds. A low reading is therefore ambiguous, and anisidine value is measured alongside it to distinguish a fresh oil from a thoroughly deteriorated one.
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