Discussion
Match each quality index in List I with what it measures in List II.
List I
A. Free fatty acid
B. Peroxide value
C. Iodine value
D. Saponification value
List II
1. Primary oxidation
2. Hydrolytic deterioration
3. Mean molecular mass of the fatty acids
4. Degree of unsaturation
Select the correct match.
Answer: D
Correct answer: A-2, B-1, C-4, D-3
The four indices measure four unrelated things. Free fatty acid records hydrolytic deterioration; peroxide value records primary oxidation, the hydroperoxide stage.
Iodine value measures unsaturation, being the mass of iodine adding across the double bonds. Saponification value measures the mean molecular mass of the fatty acids: it is the alkali needed per gram of oil, so short-chain oils such as coconut give high figures around 255 and long-chain ones around 190. Two of the four report deterioration and two report composition, which is the quickest way to halve the problem.
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