Iodine value means the “g” value of halogen which adhere to g of methods such as Hanus method and Wijs method for Iodine value. The processors of oil and fat are in need of a quick determination method of iodine value of oils and fats especially in case of checking the degree of. This test method covers the determination of the iodine value of fats and iodine value of fats and oils that do not contain conjugated 3 Wijs Solution ( Iodine Monochloride Solution) may be purchased commercially. 1.

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Ullmann’s Encyclopedia of Industrial Chemistry. This causes the remaining unreacted ICl to form molecular iodine. Saturated fatty acids contain only single bond between the carbon atoms and are tend to be solids at room temperature. Estimation of Iodine Value of Fats and Oils. The Wijs method as the standard for iodine absorption J.

Authors contributing to RSC publications journal articles, books or book chapters do not need to formally request permission to reproduce material contained in this article provided that the correct acknowledgement is given with the reproduced material. Back to tab navigation Download options Please wait Starch is used as the indicator for this reaction so that the liberated iodine will react with starch to give purple coloured product and thus the endpoint can be observed.

This unsaturation is in the form of double bondswhich react with iodine compounds. For reproduction of material from PCCP: After the reaction is complete, the amount of iodine that has reacted is determined by adding a solution of potassium iodide to the reaction product. December 20, received: Information about reproducing material from RSC articles with different licences is available on our Permission Requests page.


This page was last edited on 18 Decemberat You do not have JavaScript enabled. The fat is mixed with an excess of bromine. The processors of oil and fat are in need of a quick determination method of iodine value of oils and fats especially in case of checking the degree of unsaturation of them in the hydrogenation process. If you are the author of this article you do not need to formally request permission to reproduce figures, diagrams etc.

Iodine numbers are often used to determine the amount of unsaturation in fatty acids. If you are not the author of this article and you wish to reproduce material from it in a third party non-RSC publication you must formally request permission using Copyright Clearance Center. Wheat germ oil [5]. So handle the reagent with gloves. On the other hand, linseed oil is highly unsaturatedwhich makes it a drying oilwell suited for making oil paints.

March 17, Released: Trans fatty acids are associated with health problems and cardiovascular diseases. Bromination of the double bonds in the dark, reducing the excess bromine with iodidebacktitration of iodine with thiosulfate.

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Information related to the author. Reproduced material should be attributed ioodine follows: Unsaturated fatty acids can be converted into saturated by the process of hydrogenation. Register Already have an account?

ioeine Unreacted iodine monobromide or monochloride is then allowed to react with potassium iodideconverting it to iodine, whose concentration can be determined by titration with sodium thiosulfate.


Unsaturated fatty acids contain double bonds between the carbon atom in addition to the single bonds present in the fatty acid chain.

Journal of Japan Oil Chemists’ Society. Journal home Journal issue About the journal. A higher iodine value indicates a higher degree of unsaturation. Fatty acids are long chain hydrocarbons with carboxyl groups COOH groups.

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The Wijs method as the standard for iodine absorption – Analyst (RSC Publishing)

Back to tab navigation Fetching data from CrossRef. For reproduction of material from PPS: The double bonds present in the naturally occurring unsaturated fats are in the Cis methoc. Go to our Instructions for using Copyright Clearance Center page for details.

For reproduction of material from NJC: Meethod fatty acids can be classified into saturated or unsaturated based on the number of double bonds present in the fatty acid.

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Iodine value

Please enable JavaScript to access the full features of the site or access our non-JavaScript page. This would lead to undesirable side reactions, and thus falsifying a result consumption of bromine. Rapeseed and Canola Oil: This particular analysis is an example of iodometry. Hoffman and Green modified the Wijs’ method by employing mercuric acetate as catalyst and made it possible to determine the iodine value of a sample in ten minutes or so.