IODINE VALUE WIJS METHOD PDF

IODINE VALUE WIJS METHOD PDF

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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Iodine value

In all cases the Ref. Journal of Japan Oil Chemists’ Society.

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. Wheat germ oil [5]. Fatty acids are long chain hydrocarbons with carboxyl groups COOH groups. This page was last edited on 18 Decemberat Journal of Oleo Science. December 20, received: This may take some time to load.

Walnut oil [7] [8]. Reproduced material should be attributed as follows: Ullmann’s Encyclopedia of Industrial Chemistry. Trans fatty acids are associated with health problems and cardiovascular diseases. Retrieved 1 Januaryfrom vlab. Unsaturated fatty acids can be converted into saturated by the process of hydrogenation.

The chemical reaction associated with this method of analysis involves formation valuw the diiodo alkane R and R’ symbolize alkyl or other organic groups:. If you are the author of this article you still need to methld permission to reproduce the whole article in a third party publication with the exception of reproduction of the whole article in a thesis or dissertation. May 07, accepted: XX is the XXth reference in the list of references.

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If you are the author of this article you do not need wisj formally request permission to reproduce figures, diagrams etc. Views Read Edit View history. Journal home Journal issue About the journal. This reaction must be carried out in the dark, since the formation of bromine radicals is suppressed by light. The first page of this article is displayed as the abstract. For reproduction of material from NJC: Go to our Instructions for using Copyright Clearance Center page for details. If you are not the author avlue this article and you wish to reproduce material from it in a vvalue party non-RSC publication you must formally request permission using Copyright Clearance Center.

Analytical chemistry Dimensionless numbers of chemistry Iodine. Iodine value or number is the number of grams of iodine consumed by g of fat. From Wikipedia, the free encyclopedia.

Iodine value – Wikipedia

Kapok seed oil [9]. By using this site, you agree to the Terms of Use and Privacy Policy. Information related to the author. 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. This would lead to undesirable side reactions, and thus falsifying a result consumption of bromine. A higher iodine value indicates a higher degree of unsaturation. Unsaturated fatty acids contain double bonds between the carbon atom in addition to the single bonds present in the fatty acid chain.

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Bromination of the double bonds in the dark, reducing the excess bromine with iodidebacktitration of iodine with thiosulfate.

Addition of iodine chloride and back-titration with sodium thiosulphate by DIN Retrieved from ” https: For reproduction of material from PCCP: Calue to main content. Back to tab navigation Fetching data from CrossRef.

Depending upon the degree of unsaturation, the fatty acids can combine with oxygen or halogens to form saturated fatty acids. This quick Wijs’ method gives almost equivalent value of Hoffman’s although it tends to give less value than that of the Wijs’ method.

Already have an account? Journal of Oil Chemists’ Society, Japan. These fatty acids can be classified into saturated or unsaturated based on the number of double bonds present in the fatty acid. This unsaturation is in the form of double bondswhich react with iodine compounds. Fetching data from CrossRef.

They are likely to exists as liquids at room temperature. For reproduction of material from all other RSC journals and books: Previous article Next article. The fat is mixed with an excess of bromine.