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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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. The fat is mixed with an excess of bromine.

Please enable JavaScript to access the full features of the site or access our non-JavaScript page. Unsaturated fatty acids contain double bonds between the carbon atom in addition to the single bonds present in the fatty acid chain.

Unsaturated fatty acids can be converted into saturated by the process of hydrogenation. The Wijs method as the standard for iodine absorption J. The first page of this article is nethod as the abstract.

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Saturated fatty acids contain only single bond between the carbon atoms and are tend to be solids at room temperature. Views Read Edit View history. If you are the author of this article you still need to obtain 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. XX is the XXth reference in the list of references. This page was last edited on 18 Decemberiovine Go to our Instructions for using Copyright Clearance Center page for details.

Journal home Journal issue About the journal. Kapok seed oil [9]. Back to tab navigation Fetching data from CrossRef.

On the Determination of Iodine Value by the Wijs’ Method

This may take some time to load. Fetching data from CrossRef. 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.

May 07, accepted: 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 bromine is added to the double bonds in the unsaturated fats. Bromination of the double bonds in the dark, meyhod the excess bromine with iodidebacktitration of iodine with thiosulfate.

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Iodine value – Wikipedia

Wheat germ oil [5]. For reproduction of material from NJC: These fatty acids can be classified into saturated or unsaturated based on the number of double bonds present in the fatty acid. 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 Japan Oil Chemists’ Society. You do not have JavaScript enabled. Iodine numbers are often used to determine the amount of unsaturation in fatty acids.

This unsaturation is in the form of double bondswhich react with iodine compounds. Previous article Next article. This would lead to undesirable side reactions, and thus falsifying a result consumption of bromine. March 17, Released: Back to tab navigation.

Iodine value

To determine the iodine value of fats and oils and thus estimate the unsaturation of the fats and oils. This quick Wijs’ method gives almost equivalent value of Hoffman’s although it tends to give less value than that of the Wijs’ method.

Trans fatty acids are associated with health problems and cardiovascular diseases.