The iodine value of a substance is the weight of halogens expressed as iodine absorbed by 100 parts by weight of the substance. The quantity of substance used in the determination should be such that at least 70% of the iodine added, as provided in the recommended procedure, is not absorbed 2.2 Iodine Value Determination. 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. An iodine solution is yellow/brown in color and any chemical group in the substance that reacts with iodine will make.
determination of iodine value is of commercial importance viz.: 7 vegetable oils (olive oil, refined palm kernel oil, crude and refined palm oil, tung oil, sunflower seed oil, hydrogenated soya bean oil), 3 animal fats (crude and hydrogenated fish oil, tallow) and a used frying oil. Each of the 11 materials were provided as blind duplicates (i. . It is found that saponification and iodine value of sunflower oil are 144 and 133 respectively. Even though there are different kinds of vegetables, this study is limited to sunflower oil. Keywords: Sunflower Oil, Iodine Value and Saponification Value Iodine value refers to the percentage of iodine absorbed by a substance such as a fat or oil 1. It is an indication of a fat's It is an indication of a fat's potential to be oxidized as it measures the reaction of iodine with the double bonds of unsaturated fatty acids 2
determination of iodine value of fatty acids in the range of 40 to 120. The standards which used for constructing a calibration graph were fatty acids with the known iodine value obtained by AOAC Wijs solution method. A spectrophotometric based analytical system was also proposed by Thomaidis et al.  for determination of olive oil iodine value Zealand Food Standards Code, calculate the iodine content (in mg of iodine (I) per kg of salt) from your result above as follows: iodine (I) content = iodate (IO3−) content x 126.9/174.9 Additional Notes 1. According to the specified limits for iodate in iodised salt, the volume of 0.002 mol L−1 sodium thiosulfat Different methods are available for determining the unsaturation level in fatty acids, one of which is by determining the iodine value of fats. In this experiment, cyclohexane method was used to determine the iodine value of sunflower oil, palm oil and corn oil. Apparatus and materials: Refer to lab manual page 25 with minor modifications The iodine value is the mass of iodine in grams that is consumed by 100 grams of a chemical substance. Iodine numbers are often used to determine the amount.
DETERMINATION OF IODINE VALUE PRESENTED BY HARISH PUDI M PHARM, 2nd SEM DEPT OF PHARMA ANALYSIS, PES COLLEGE OF PHARMACY. 2. CONTENTS DEFINITION IMPORTANCE PRINCIPLE METHODS PROCEDURE CALCULATION 3. IODINE VALUE The iodine value of an oil/fat is the number of grams of iodine absorbed by 100g of the oil/fat, when determined by using Wijs. Add to the BLANK, 20ml of Iodine Monochloride reagent and mix the contents in the flask thoroughly. Incubate the BLANK in dark for 30 minutes. Mean while, Take out the TEST from incubation after 30 minutes and add 10 ml of potassium iodide solution into the flask Determination of Iodine Numbers of Edible Oils RAMESH CHANDRA GUPTA and GULAB KANWAR Department of Biochemistry Kota Medical College Kota 324005 India Introduction This experiment has been introduced recently in the first semester curriculum of undergraduate medical students of our newly established medical college Iodine value (IV) is a measure of the total number of double bonds present in fats and oils. It is expressed as the «number of grams of iodine that will react with the double bonds in 100 grams of fats or oils». The determination is conducted by dissolving a weighed sample in a non-polar solvent such as cyclohexane, then adding glacial acetic acid
A higher iodine value indicates a higher degree of unsaturation. unsaturated fatty acids THEORY Iodine value (IV) is a measure of the total number of double bonds present in fats and oils. It is expressed as the number of grams of iodine that will react with the double bonds in 100 grams of fats or oils. The determination is conducted by. The iodine value from the above experiment were calculated from the average titre volume of sodium thiosulphate (Na 2 S 2 O 3 ) used in the titration of both the sample and the blank and wer raises the iodine value from mean value 18*6 to about 121 and of ethyl crotonate from 24'5 to 170*3. As the general results of our experiments we conclude that Winlder's method is the most convenient and gives reliable results for ordinary fats and oils if the addition takes place in the absence of light Pdf Determination Of Iodine Value Of Palm Oil By Differential Scanning Calorimetry . For more information and source, Biochem Lab 7 Docx Experiment 7 Iodine Number Determination Of Triacylglycerols 2 Table 1 Calculated Iodine Value Of Oil And Fat Lipid Lipid Sample Course Hero A modified determination of iodine value in fats, fatty acids, and fatty acid derivatives is reported. The described procedures, visual and potentiometric, have wide applicability and generate.
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 . Solution: Since M 1 and V 2 are the same as in the previous example, we see that only V 1 has changed to 10.00 mL. Rearranging for M 2 as before: M 2 = 0.0050 M * 10.00 mL / 25.00 mL = 0.0020 M, the concentration of iodine used in the reaction in experiment #2. 2. Average each pair of times for each experiment then calculate. Demonstrated by Dr. K. Lalitha, Department of Chemistry, SASTRA Deemed Universit 2.201 Determination of the acid value (A.V.) and the acidity 2.202 Determination of the saponification value (S.V.) 2.203 Determination of the ester value (E.V.) 2.204 Determination of volatile acids (Reichert-Meissi, Polenske and Kirschner values) 2.205 Determination of the iodine value (IV.) 2.206 Determination of di- and tn-unsaturated fatty. No. 127, 2002, 2nd Ed.: Hydroxyproline. Colorimetric Determination as a Measure of Collagen in Meat and Meat Products • No. 39, 1972, 2nd Ed.: Iodine value. Determination in Fats (Wij's method) • No. 116, 1985: Iron. Photometric Determination in Food • No 138, 1991: L-Glutamic Acid and Monosodium Glutamate. Enzymatic Determination in.
An experiment has been developed that combines the FTIR analysis of oils and fats with an iodometric titration. While it is most appropriate for a sophomore or junior laboratory for majors, it also makes a suitable group project or demonstration for nonscience majors. Integration of the experiment into an upper-level biochemistry laboratory is described Iodine value, also called iodine number or iodine index, is the mass of iodine in grams absorbed by 100 grams of oil/fat. It is used in the estimation of the degree of unsaturation in fatty acids. The double bonds present in unsaturated fatty acids react with the iodine; t he more the iodine number, the more the number of C=C bonds DETERMINATION OF SAPONIFICATION VALUE LOW L. K. & NG C. S. INTRODUCTION Saponification is the hydrolysis of esters. Oils and fats are the fatty acid esters of the trihydroxy alcohol, glycerol. The saponification value of an oil is defined as the number of milligrams of potassium hydroxide required to neutralise the fatty acids resulting from th Determination of Refractive Index Determination of Flash Point 6.1 Pensky Martin Closed cup Method 6.2 Hexane Residues in oils and fats Determination of Colour Determination of Melting Point of Fat Determination of Saponification Value Determination of Unsaponifiable Matter Determination of Acid Value Determination of Iodine Value Similarly calculate concentration of iodine in organic layer of all other sets. 2. For aqueous layer Normality of Na 2 S 2 O 3 (N 1 = 0.01N) Volume of organic layer pipetted (V 2) = 10 ml N 1 V 1 (Na 2 S 2 O 3) = N 2 V 2 (Aqueous layer) Similarly calculate concentration of iodine in of all other sets.
In this experiment the Reaction Rate will be calculated by dividing the experimentally determined increase in concentration of one of the products (elemental iodine, I 2), by the corresponding time interval: Δ I 2 Rate = Δ t The experimental determination of the increase in concentration of iodine (I 2), during 59 Example: Determine the concentration of iodine in experiment #2. Solution: Since M 1 and V 2 are the same as in the previous example, we see that only V 1 has changed to 10.00 mL. Rearranging for M 2 as before: M 2 = 0.0050 M * 10.00 mL / 25.00 mL = 0.0020 M, the concentration of iodine used in the reaction in experiment #2. 2. Average each pair of times for each experiment then calculate. Determination of iodine value of oil The iodine value is a measure of the degree of unsaturation in an oil. It is constant for a particular oil or fat. Iodine value is a useful parameter in studying oxidative rancidity of oils since higher the unsaturation the greater the possibility of the oils to go rancid
An experiment which has proved successful in introducing the spectro- scopic determination of molecular energy levels and thermodynamic quantities is the analysis of the visible band spectrum of either iodine or bromine. In addi- tion, this experiment introduces techniques now widely used in high temperature and astro-chemical studies The iodine value (IV) gives a measure of the average degree of unsaturation of a lipid: the higher the iodine value, the greater the number of C=C double bonds. By definition the iodine value is expressed as the grams of iodine absorbed per 100g of lipid. One of the most commonly used methods for determining the iodine value of lipids is Wijs. Showing the results obtained after the acid value experiment of a fat TITRE VALUE OF TYPE OF OIL STATE (F/R) ACID VALUE (mg) KOH (ml) F 0.02 0.112 SOYA BEAN OIL R 0.10 0.560 F 0.05 0.280 EXTRACTED OIL R 0.03 0.168 F 0.04 0.224 MARGARINE R 0.35 1.960 F 0.11 0.616 OLIVE OIL R 0.28 1.568 F 0.03 0.168 VEGETABLE R 0.05 0.280 The table shows. The determination of iodine value is a particular example of iodometry.A solution of iodine I 2 is yellow/brown in color. When this is added to a solution to be tested, however, any chemical group (usually in this test -C=C- double bonds) that react with iodine effectively reduce the strength, or magnitude of the color (by taking I 2 out of solution). ). Thus the amount of iodine required to.
The iodine content and thus the active chlorine content can be determined with iodometry. The determination of arsenic(V) compounds is the reverse of the standardization of iodine solution with sodium arsenite, where a known and excess amount of iodide is added to the sample: As 2 O 5 + 4 H + + 4 I − ⇌ As 2 O 3 + 2 I 2 + 2 H 2 Determination Of Iodine Value Of Oil Experiment. Determination Of Iodine Value Of Fats And Oil Discover Food Tech . Pdf Determination Of Iodine Value In Triisocetyl Citrate Citmol 316 By United Satates Pharmacopeia Hanus Method . For more information and source,. 2.2.2 Saponification Value 6 2.2.3 Iodine Value 6 2.3.4 Free Fatty Acid Measurement 7 2.2.5 Peroxide Value 7 2.3 Toxic Compound 8 2.3.1 Hydroperoxide 10 2.3.2 Adverse Health Effects 12 CHAPTER 3 METHODOLOGY 3.1 Chemicals and Reagents 3.2 Collection of Sample 3.3 Peroxide Value Test 16 CHAPTER 4 RESUL Iodine value = 1.269 (b - a)/w where, w = weight, in g, of the substance. The approximate weight, in g, of the substance to be taken may be calculated by dividing 20 by the highest expected iodine value. If more than half the available halogen is absorbed, the test must be repeated with a smaller quantity of the substance This document specifies a reference method for the determination of the iodine value (commonly known in the industry as IV) of animal and vegetable fats and oils, hereinafter referred to as fats. Annex B describes a method for the calculation of the IV from fatty acid compositional data
Determination of Iodine from Iodine Tablets Your lab instructor will dissolve 4 iodine purification tablets in about 2 liters of deion-ized water. Make sure all of your iodine samples come from the same lab. 6. Refill your buret with sodium thiosulfate solution and record the initial volume The determination of peroxide value is highly empirical. Variations in the procedure may affect the results. In case of divergent results between two laboratories, the two parts must carry out a second series of analyses strictly applying common critical parameters: - Test portion The value obtained depends on the sample mass ∴ The value of distribution coefficient is 2 4 O 4.412 85.5 0.0516 == CCl H C C (b) Calculation of solubility Applying Distribution law, Solubility of iodine in CCl4 85.5 Solubility of iodine in water = ∴ 4 Solubility of iodine in CCl 85.5 0.34 = or Solubility of iodine in CCl 4 = 85.5 × 0.34 = 29.07 g litre-1 EXPLANATION OF DISTRIBUTION.
Determination of iodine value was done according to Hanuš using a solution of iodo-monobromine and by back titration with 0.1 N solution of sodium thiosulfide . Chem. zvesti 29 (2) 256-264 (1975) 25$ V. KOMAN, E. DANIELOVÁ Simultaneously, the iodine values were derived by determination of unsaturated fatt In this experiment you will investigate the kinetics of the reaction between persulfate and iodide ions S 2O 8 2-+ 2I-→ 2SO 4 2-+ I 2 (R1) The rate of reaction may be measured by adding a small, known quantity of thiosulfate. The iodine produced in this reaction (R1) is, as it is formed, reduced back to iodide by the thiosulfate: 2S 2O 3 2. Iodine number (IN) The iodine number is determined according to the ASTM D4607-94 method. The iodine number is defined as the milligrams of iodine adsorbed by 1.0 g of carbon when the iodine concentration of the filtrate is 0.02 N (0.02 mol L-1). This method is based upon a three-point isotherm. A standard iodine solution is treated with thre Iodine value: C x Conversion factor; mg/gm. Factor:Mol wt. of iodine (127) x normality of iodine x 40 / Wt. of carbon x Blank reading . C=B-A . Note: Iodine test should be performed on dry basis . Carbon should be dried in oven at 110 o C for three hours before weighing . Iodine value is expressed in mg/gm of carbo IODINE NUMBER (Wijs Method) ⎯ continued 2. If the iodine number is to be characteristic of the oil, the sample should be substantially free of moisture and foreign materials. 3. The iodine number of refined corn oil is usually about 125, and this value is assumed for the recommended sample size. For samples with higher o
VALUE''DETERMINATION OF THE IODINE VALUE OF OILS AND FATS Results May 9th, 2018 - For this investigation samples of crude fish oil tung the iodine value on each sample using carbon tetrachloride and one determination only using a' 'Saponification Experiment Pdf WordPress Co 6. Define saponification value of an oil or fat . Ans: See the 'theory' of the project. 7. Define iodine value of an oil. What does this indicate ? Ans: Iodine value of an oil is defined as the mass in grams of iodine that react with 100 grams of oil. It is a measure of the degree of unsaturation of an oil. 8 High the iodine value high is unsaturation. So, the basic objective of this test is to determine the iodine number of fat. 1. Principle: Fatty acids react with halogen that is iodine that results in addition of halogen at C=C double bond site Earl N. Meyer Date of Experiment: 2/2/2010 Florence F. Lask (partner) Abstract: The rate, rate law and activation energy of the iodination of acetone are determined by observing the disappearance of the characteristic color of iodine in water. By systematically varying the concentration of reactants, the rate law is determined to be: Rate disappearance of a reactant. In this experiment, the rate of consumption of the iodine will be measured to determine the rate of the reaction. As reaction (1) runs, the amount of iodine (I 2) produced from it will be followed using reaction (2): 2S 2 O 3 2 + I 2 S 4 O 6 2 + 2I (2) thiosulfate iodine tetrathionate iodid
simultaneously forming iodine, and if the iodine is subsequently titrated with thiosulfate, the technique is iodometry. Iodometry is an example of an indirect determination since a product of a preliminary reaction is titrated. The use of iodine as a titrant suffers from two major disadvantages. First, iodine is no value. Iodine value is used to measure unsaturation or the average number of double bonds in fats and oils. It is defined as the number of grams of iodine that could be added to 100 g of oil, which is measured with the AOCS Method cd 1-25. A high, iodine value indicates high unsaturation. The chemical reaction associated with this method o In this experiment we will study the kinetics of the reaction between iodine and acetone: O H+ O C + I2(aq) + HI(aq) C H3C CH3 H3C CH2I The rate of this reaction is found to depend on the concentration of the hydrogen ion (acid, HCl) as well as the concentrations of the reactants (acetone and iodine). The rate law for this reaction i ISO 3961:2009 specifies a reference method for the determination of the iodine value (IV) of animal and vegetable fats and oils, hereinafter referred to as fats. Annex A describes a method for the calculation of the IV from fatty acid compositional data. This method is not applicable to fish oils
1.1 This test method covers the determination of the relative activation level of unused or reactivated carbons by adsorption of iodine from aqueous solution. The amount of iodine absorbed (in milligrams) by 1 g of carbon using test conditions listed herein is called the iodine number 2. Determination of Total hardness Repeat the above titration method for sample hard water instead of standard hard water. Let the burette reading of EDTA be V 3 ml. 3. Determination of Permanent hardness Take 100 ml of sample hard water in 250 ml beaker. Boil it to remove temporary hardness to about half of this volume and cool to room. Determination of Iodine Value The method specified by ISO 3961 (1989) was used. 0.4g of the sample was weighed into a conical flask and 20ml of carbon tetra chloride was added to dissolve the oil. Then 25ml of Dam's reagent was added to the flask using a safety pipette in fume chamber
Form 6 Chemistry Experiment NKM Experiment 11 p.3/3 3. How does the concentration of iodine change throughout the experiment ? 4. Find the gradient of the graph. 5. Does the rate of the reaction, which in this case is directly proportional to the gradient of the graph, vary with different concentrations of iodine ? 6 In this experiment the concentration of the hydronium ion is maintained at a constant value (approximately 2 10 5 M) by using a buffer solution. Therefore, the expression for the rate of the reaction simplifies to rate = k' [H 2 O 2]a[I-]b (3) where k' is the rate constant at a given hydronium ion concentration and is equal to k[H 3 O+]c. The. A modified determination of iodine value in fats, fatty acids, and fatty acid derivatives is reported. The described procedures, visual and potentiometric, have wide applicability and generate less solvent waste. These analytical procedures are based on a nonchlorinated solvent system. The performance of the new procedures was evaluated in a multiple-laboratory study Discussion The measured volume used in the standardization of the iodine solution (0.0146 L) was accurate as the difference between it and the theoretical value of 0.0227 L was 0.0081 L. From the experiment, 0.16 g of vitamin V was found to be in the apple juice sample which was only 0.15 g higher than the expected value from the bottle label. iodine is in skin and bones and very small amount (under 1.0 %) in blood. Iodine is given in food to prevent the consequences of iodine deficiency. It is proved that table salt is, consumed in relatively constant amounts (about 10 g/day), the great carrier of iodine, so it proved to be the most reliable way to take in iodine (WHO/NUT/94.6)
The iodine clock reaction is a well-known and memorable chemical reaction where two colorless solutions are mixed and, after a period of time ranging from seconds to minutes, the solution suddenly turns from colorless to colored (yellow or bluish-black 5) Iodine Test: Iodine test is an indicator for the presence of starch. Iodine solution (iodine dissolved in an aqueous solution of potassium iodide) reacts with starch producing a blue-black color. Apply this test to all the polysaccharides provided. Procedure: - To 2-3 mL of polysaccharide solution, add 1-2 drops of iodine solution Determination of iodine species content in iodized salt with various methods a. Dry method The simulated iodized salt sample was made by mixing potassium iodate (122.30 mg) with 1 kg NaCl p.a. in a ribbon blender and mixed at 24 rpm for 10-15 min, until visual homogeneity was achieved Experiment 6: THE RATE LAWS OF AN IODINE CLOCK REACTION 59 Purpose: The rate law for the reaction of an iodine clock reaction is to be established. It involves the determination of the order of reaction with respect to each of two reactants, as well as the determination of the rate constant for a particular temperature. Introduction:. Experiment 1 (Lab period 1) Spectrophotometry: Absorption spectra and the use of light absorption to measure concentration Spectrophotometry is a procedure that is frequently utilized in biological laboratories. Probably the most common application in biology of this technique is in the measurement of the concentration of a compound in solution between 0.18 and 0.25. Note these wavelengths and also this amount of iodide/iodine stock solution! 6. Place this same amount of the iodide/iodine stock solution into several 100 mL volumetric flasks. To each flask, add between 1 mL and 10 mL of the 0.1M KI solution and dilute each to the mark with water. This should increase the absorbanc