Determination of Iodine Number

Iodine Number Analysis Why and How?

The amount of iodine that reacts with double bonds in 100 grams of fat is the expression of the "iodine number" in grams.

The number of iodine in vegetable oils varies depending on the region where the plant is grown, climatic conditions and seed ripening.

The result of determination of iodine number;

- It shows the degree of saturation and unsaturation of the oil.
- It shows the drying property of the oil.
- It allows us to have information about the hydrogenation process performed in the oil and the determination of whether another oil is mixed with the oil.

There are 2 methods used to determine the iodine number.

- Wijs Method
- Hanus Method

Determination of the iodine number is based on the principle that the oil dissolved in a solvent that does not affect the reaction is left to react with the iodine solution for a certain period of time and the amount of iodine remaining in the environment at the end of the period is back-titrated with sodium thiosulfate solution in the presence of starch indicator.

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