What is the purpose of an iodine value test on stearic acid raw material?

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SUMMARY

The iodine value test is utilized to determine the degree of unsaturation in fatty acids, including stearic acid, which is a saturated fatty acid. Despite its saturation, performing this test on stearic acid raw material can reveal the presence of unsaturated impurities. A result greater than zero indicates the contamination of the sample with unsaturated fatty acids, which is critical for quality assurance in pharmaceutical applications. Thus, the iodine value test serves as a quality control measure to ensure the purity of stearic acid used in formulations.

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CrimpJiggler
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In my lab at college we were analysing various pharmaceutical excipients, stearic acid being one of them. We did an iodine value test on it. From what I've read, the iodine-value test is to determine the degree of unsaturation of a compound. Stearic acid is a saturated fatty acid so I don't understand how this test can be performed on it. It was a raw material sample we were analysing like you would do if you were a quality assurance analyst for a pharmaceutical company. What purpose could performing an iodine value test on a stearic acid raw material sample serve?
 
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Just guessing - if the result is anything but zero, you know you have unsaturated impurities.
 

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