Iodine value

Table of Contents • • • • • • • • • • • • • • • • • • • • • • • • • • Why do we calculate iodine value? Iodine numbers are often used to determine the amount of unsaturation in fats, oils and waxes. … In fatty acids, unsaturation occurs mainly as double bonds which are very reactive towards halogens, the iodine in this case. Thus, the higher the iodine value, the more unsaturations are present in the fat. What is 12.69 in iodine value formula? Determination of iodine value The iodine value was determined by the PORIM Test Method 8. Iodine value was calculated as 12.69N (V 2 V 1)/W where N=Normality of Na 2 S 2 O 3 used; W=the Volume in millilitres of Na 2S 2O 3 used (Blank); V 1=the Volume in millilitres of Na 2S 2O 3 solution used for the determination (test sample). How do you calculate iodine in oil? 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. Oils rich in saturated fatty acids have low iodine numbers, while oils rich in unsaturated fatty acids have high iodine numbers. What is the normal range of iodine value? Decrease in iodine value shows decrease in the number of double bonds and it indicates oxidation of the oil. Iodine value recommended standards are as follows (g of iodine/100g of oil): Palm 50-55, corn 103-135, soybean 120-143, sunflower 110-143 and peanut 84-105 [12]. Read More: Why did Texas secede from Mexico? What is acetyl value? : a measure of the free hydroxyl groups in a su...

Iodine Value The iodine value stands in some relation to oxidative stability and reflects both the propensity of an oil or fat to oxidise and to polymerise and form engine deposits. From: Biodiesel Science and Technology, 2010 Related terms: • Oxidation Reaction • Biodiesel • Transesterification • Feedstock • Antiknock Rating • Cold Filter Plugging Point • Flash Point • Oxidative Stability The iodine value, expressed as grams of I 2 absorbed/100g sample under standard conditions, is a measure of the unsaturation of oils and fats and their fatty acid derivatives, and can be determined in many different ways. IV is used for the determination of the quality of diesel fuel derived from vegetable oils [ 9]. Several alternative calculation procedures to determine IV of oils directly from their FAME composition have been proposed [ 10, 11], including the American Oil Chemists’ Society (AOCS) method Cd 1d-92 [ 10]. According to EN 14214 (Annex B) for determination of the iodine number the mass percentage of the fatty acid methyl esters is multiplied by an assigned weighting factor. Table 6.2 shows the iodine value for a typical rapeseed oil calculated according to this procedure. Whereas the fatty acid molecular weights do affect the determination of IV, the relative amounts of the different acids and their number of double bonds are more crucial for the determination of IV. The iodine value therefore depends mainly on the percentage concentration of unsaturated fatty acid compone...

In a 2013 study published in Lancet, researchers evaluated the effect of insufficient iodine in pregnancy on cognitive outcomes in children. Researchers measured urinary iodine concentration in 1,040 pregnant participants during the first trimester. Later, they also measured the children's intelligence quotient (IQ) at age 8. First, researchers assessed the iodine concentration of 266 pregnant people attending antenatal clinics at the Royal Hobart Hospital in Australia from 1999 to 2000. Then, researchers compared their children's standardized test scores in literacy and math when they were ages 8–9, 10–11, 12–13, and 14–15 years. The study found that even mild iodine deficiency in pregnancy had long-term cognitive effects. For example, children whose parents had iodine deficiency during pregnancy had reduced scores in reading, spelling, and grammar, independent of other factors known to impact learning. These effects did not resolve with sufficient iodine intake during childhood. In addition to cancer treatments, iodine may also help prevent thyroid cancer after nuclear emergencies. Nuclear accidents can release radioactive iodine into the environment, increasing the risk of thyroid cancer in those exposed. Thus, some research has evaluated whether iodine supplementation could reduce cancer risk in high-risk populations following some historic nuclear disasters. The FDA recommends potassium iodide as a thyroid blocking agent in nuclear emergencies. Side Effects of Iodine ...

Thank you for visiting nature.com. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. Iodine value (IV) is a significant parameter to illustrate the quality of edible oil. In this study, three portable spectroscopy devices were employed to determine IV in mixed edible oil system, a new Micro-Electro-Mechanical-System (MEMS) Fourier Transform Infrared Spectrometer (MEMS-FTIR), a MicroNIR TM1700 and an i-Raman Plus-785S. Quantitative model was built by Partial least squares (PLS) regression model and four variable selection methods were applied before PLS model, which are Monte Carlo uninformative variables elimination (MCUVE), competitive reweighted sampling (CARS), bootstrapping soft shrinkage approach (BOSS) and variable combination population analysis (VCPA). The coefficient of determination (R 2), and the root mean square error prediction (RMSEP) were used as indicators for the predictability of the PLS models. In MicroNIR TM1700 dataset, MCUVE gave the lowest RMSEP (2.3440), in MEMS-FTIR dataset, CARS showed the best performance with RMSEP (2.2185), in i-Raman Plus-785S dataset, BOSS gave the lowest RMSEP (2.5058). They all had great improvements than full spectrum PLS model. Four variable selection methods take a smaller num...

Sponsored by Bruker Optics Feb 6 2012 Iodine value (IV) is a measure of the total number of unsaturated double bonds present in fats and oils. It is normally expressed in terms of “number of grams of iodine that will react with the double bonds in 100 grams of fats or oils”. It must be noted that a high IV value in oil consists of a greater number of double bonds than a low IV oil. Fats with high iodine value are normally soft or liquid and are less stable to oxidation. The AOCS recommended method D1959-97 (Wij’s procedure) is broadly used for determination of IV. The method involves adding halogen in the presence of potassium iodide and the titrating the released iodine with sodium thiosulfate using a standard starch solution as the indicator. The time taken for this analysis is at least 30 minutes and has to be performed on samples taken out of the process line. On the other hand, near infrared (NIR) spectroscopy is quick with an analysis time of the order of less than 1 minute and does not need the use of any solvents or reagents. Fiber optic probes are very useful and help perform real time, on-line measurement of IV resulting in huge time and cost savings. Laboratory measurements were performed by AOCS Cd1e-1 method using a -1. Figure 1. Laboratory measurements using FT-NIR spectrometer with 8 mm disposable vials. Figure 2 shows three measured NIR spectra between 7800 and 9000 cm -1. The intensity of the spectral feature at ~8580 cm -1 can be correlated with the known...