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)

Kethod home Journal issue About the journal. To determine the iodine value of fats and oils and thus estimate the unsaturation of the fats and oils. The double bonds present in the naturally occurring unsaturated fats are in the Cis form. Jump to site search. From Wikipedia, the free encyclopedia.

If you are the author of this article you do not need to formally request permission to reproduce figures, diagrams etc. Fetching data from CrossRef. Journal of Wojs Science. Journal of Oil Chemists’ Society, Japan.

Iodine value

This quick Wijs’ method gives almost equivalent value of Hoffman’s although it tends to give less value than that of the Wijs’ method. This may take some time to load. Starch is used as the indicator for this reaction so that the liberated iodine will react with starch to give mthod coloured product and thus the endpoint can be observed.


For reproduction of material from all other RSC journals and books: This causes the remaining unreacted ICl to form iidine iodine. This reaction must be carried out in the dark, since the formation of bromine radicals is suppressed by light.

Fatty acids are long chain hydrocarbons with carboxyl groups COOH groups. If vqlue 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. Back to tab navigation Download options Please wait Iodine numbers are often used to determine the amount of unsaturation in fatty acids.

The Wijs method as the standard for iodine absorption. Search articles by author J. Retrieved from ” https: Retrieved 1 Januaryfrom vlab.

Iodine value – Wikipedia

This would lead to undesirable side reactions, and thus falsifying a result consumption of bromine. Mercuric acetate, however, cannot be empolyed now because the reaction solution is hard to meet the regulation of water pollution and its disposal has become difficult.

Kapok seed oil [9]. Back to tab navigation. A higher iodine value indicates a higher degree of unsaturation. By metyod this site, you agree to the Terms of Use wjjs Privacy Policy. Already have an account?

This particular analysis is an example of iodometry. The iodine value or iodine adsorption value or iodine number or iodine index in chemistry is the mass of iodine in grams that is consumed by grams of a chemical substance. Rapeseed and Canola Oil: The chemical reaction associated with this method of analysis involves formation of the diiodo alkane R and R’ symbolize alkyl or other organic groups:. You do not have JavaScript enabled. So handle the reagent with gloves. Information about reproducing material from RSC articles with different licences is available on our Permission Ioine page.


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This bromine is added to the double bonds in the unsaturated fats. Saturated fatty acids will not give the halogenation reaction. For reproduction of material from NJC: 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: Views Read Edit View history. The Wijs method as the standard for iodine absorption J. Unsaturated fatty acids can be converted into saturated by the process of hydrogenation.

On the other hand, linseed oil is highly unsaturatedwhich makes it a drying oilwell suited for making oil paints. Addition of iodine chloride and back-titration with sodium thiosulphate by DIN 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. May 07, accepted:

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