Determination of iodine numbers of edible oils wiley online library. It is expressed as the number of grams of iodine that will react with the double bonds in 100 grams of fats, oils, and waxes. Astm d5554 standard test method for determination of the iodine value of fats and oils aoac 920. Estimation of iodine value of fats and oils youtube. It is expressed as the iodine in grams that will react with the double bonds in 100 grams of fats or oils. The iodine value of animal and vegetable fats and oils measures the amount of cc double bonds present in the product. The larger the iodine value the greater the degree of unsaturation. Estimation of iodine value of fats and oils theory.
This unsaturation is in the form of double bonds, which react with iodine compounds. Theory iodine value of fats and oil iodine number is a measure of the total number of double bonds present in fats and oils. Bellier test turbidity temperature acetic acid method. Determination of iodine value of fats and oil discover. Determination of acid value acidity, of iodine value, and of peroxide value. Iodine value or number is the number of grams of iodine consumed by 100g of fat. Determination of iodine value iv along with factors like acid value, peroxide value, saponification value, solid fat index, refraction value, and trans fatty acid content is an important factor. Iodine value is used as a parameter in process control as well as a quality parameter in traded palm oil products.
The higher the iodine value, the more unsaturated fatty acid bonds are present in a fat. 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 100 grams of a chemical substance. Determination of the iodine value of oils and fats results. Determination of iodine value of palm oil by differential scanning calorimetry article pdf available in journal of the american oil chemists society 748. It is defined as the number of grams of iodine absorbed by 100 g of fat. Iodine value of edible oils and fats according to wijs. Seven important parameters for analysis of edible oils and.
To determine the iodine value of fats and oils and thus estimate the unsaturation of the fat oil. Pdf determination of iodine value in triisocetyl citrate. It is expressed as the number of grams of iodine that will react with the double bonds in 100 grams of fats or oils. This unsaturation is in the form of double bonds which react with iodine compounds. The mean value of the blank determination method 051b is automatically stored as auxiliary value h3. Estimation of iodine value of fats and oils procedure. In the food industry the fatty acid composition of oils and fats is of importance in terms of nutritional values and the chemical and physical properties such as. The protocol for iodine value determination usually comprises a titration procedure, such.
Determination of the iodine value of oils and fats oxford. Two collaborative studies were conducted using the wijs method for determining the iodine value in a wide range of vegetable and animal oils and fats. Standard methods for the analysis of oils, fats and. Determination of reichert meissl and polenske value. Iodine value iv is a measure of the total number of double bonds present in fats and oils. If the iodine number is to be characteristic of the oil, the sample should be substantially free of moisture and foreign materials.
The result is expressed as g of iodine i2 per 100 g of sample. Pdf determination of iodine value in triisocetyl citrate citmol. Iodine numbers are often used to determine the amount of unsaturation in fatty acids. The results of a statistical evaluation of the iodine values obtained in the 1st collaborative study in which 11 laboratories from 9 countries participated are summarised in table 2. The iodine value iv indicates the degree of unsaturation of a fat or oil. Several methods for the determination of the iodine number of fats and oils have been used. Fatty acids react with a halogen iodine resulting in the addition of the halogen at the cc double bond site. The iodine number equals the number of mg of iodine required to saturate the fatty acids present in 100 mg of the oil or fat. A b s t r a c t the iodine value iv also called iodine number or iodine absorption value is an important analytical characteristic of unsaturation of fats and oils. Determination of iodine value of palm and palmkernel oil by carbona. Manual on oils and fats food safety and standards authority. The determination is conducted by dissolving a weighed sample in a nonpolar solvent such as cyclohexane, then adding glacial acetic acid.
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