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

Iodine value or number is the number of grams of iodine consumed by g of fat. They are likely to exists as liquids at room temperature. 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.

For reproduction of material from PCCP: Bromination of the double bonds in the dark, reducing the excess methood with iodidebacktitration of iodine with thiosulfate.

Iodine value

By using this site, you agree to the Terms of Use and Privacy Policy. This would lead to undesirable side reactions, and meethod falsifying a result consumption of bromine.

A higher iodine value indicates a higher degree of unsaturation. Starch is used as the indicator ioodine this reaction so that the liberated iodine will react with starch to give purple coloured product and thus the endpoint can be observed. To determine the iodine value of fats and oils and thus estimate the unsaturation of the fats and oils.


Kapok seed oil [9]. 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. In all cases the Ref. Jump to site search. Saturated fatty acids contain only single bond between the carbon atoms and are tend to be solids at room temperature. The chemical reaction associated with this method of analysis involves formation of the diiodo alkane R and R’ symbolize alkyl or other organic groups:.

Journal of Oleo Science. This particular analysis is an example of iodometry. Register Already have an account? Go to our Instructions for using Copyright Clearance Center page for details. Retrieved 1 Januaryfrom vlab. This page was last edited on 18 Decemberat From Wikipedia, the free encyclopedia.

Trans fatty acids are associated with health problems and cardiovascular diseases. The first page of this article is displayed as the abstract. The double bonds present in the naturally occurring unsaturated fats are in the Cis form. Saturated fatty acids will not give the halogenation reaction.

Jump to main content. For reproduction of material from PPS: Authors have investigated other methods of quick determination of iodine value especially for the oils in the iocine process and have found after all the Wijs’ method could be appropriate by only shortening the reaction time to three minutes for the oils of the iodine value less than about If you are the author of this article you do not need to formally request permission to reproduce figures, diagrams etc.


Walnut oil [7] [8].

Unsaturated fatty acids contain double bonds between the carbon atom in addition to the single bonds present in the fatty acid chain. Depending upon the degree of unsaturation, the fatty acids can combine with oxygen or halogens to form saturated fatty acids.

May 07, accepted: Previous Article Next Article. This bromine is added to the double bonds in the unsaturated fats. Iodine monochloride is caustic.

Previous article Next article. Analytical chemistry Dimensionless numbers of chemistry Iodine. 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. Methdo fatty acids can be converted into saturated by the process of hydrogenation.

Retrieved from ” https: This may take some time to load. You do not have JavaScript enabled. This reaction must be carried out in the dark, since the formation of bromine radicals is suppressed by light. Information about reproducing material from RSC articles mwthod different licences is available on our Permission Requests page.

Fetching data from CrossRef. Journal home Journal issue About the journal. Wheat germ oil [5]. Rapeseed and Canola Oil: Triglycerides are made up of three fatty acids linked to glycerol by fatty acyl esters. Already have an account? Search articles by author J.