Iodine value determination of edible oils using ATR-FTIR and chemometric methods

2017 ◽  
Vol 119 (9) ◽  
pp. 1600323 ◽  
Author(s):  
Xianghe Meng ◽  
Qin Ye ◽  
Xiaohua Nie ◽  
Lianzhou Jiang
Keyword(s):  
Iodine Value ◽  
Edible Oils ◽  
Chemometric Methods ◽  
Value Determination

FATTY ACIDS AND THEIR ESTERS: III. IODINE VALUES BY THE BROMINE VAPOR METHOD

1936 ◽  
Vol 14b (6) ◽  
pp. 237-242 ◽  
Author(s):  
H. N. Brocklesby ◽  
K. F. Harding
Keyword(s):  
Fatty Acids ◽  
Iodine Value ◽  
Close Agreement ◽  
Wijs Method ◽  
Iodine Values ◽  
Bromine Vapor ◽  
Value Determination ◽  
Vapor Method

A modified bromine vapor method for iodine value determination that allows of the determination of substitution is described. For non-conjugated unsaturated oils free from oxidation or polymerization products, values are obtained that are in close agreement with those found by Wijs' method. The unsaturation of conjugated esters can be determined satisfactorily. Owing to substitution, the unsaturation of oxidized or polymerized esters cannot be determined by this method.

The Dissolution of Vulcanized Rubbers and Its Bearing on Problems of Rubber Analysis

1954 ◽  
Vol 27 (2) ◽  
pp. 535-541
Author(s):  
W. C. Wake
Keyword(s):  
Iodine Value ◽  
Transmission Spectra ◽  
Infrared Transmission ◽  
Roller Mill ◽  
Vulcanized Rubber ◽  
Synthetic Rubber ◽  
Determining Factors ◽  
Analytical Procedures ◽  
Value Determination

Abstract Dissolution of a sample of vulcanized rubber is a necessary preliminary to several analytical procedures, e.g., the determination of iodine value or total fillers. If an infallible and convenient agent were available for this process, then doubtless other analytical procedures would be possible of development or improvement and examination of infrared transmission spectra of vulcanized samples would prove a feasible means of identification. Although decalin and nitrobenzene have been widely and satisfactorily used for natural rubber (polyisoprene), there have been several references in the literature to difficulties encountered with the most widely used synthetic rubber, GR-S. Devices to overcome these difficulties include comminution on a roller mill, swelling the sample in strong swelling agents before transferring to the solvent to be used for the dissolution, and grinding on a rubber mill with a plasticizer. All these must be regarded as being of the nature of palliatives, knowledge of the nature of the dissolution process being the real need before the best condition for carrying it out can be decided on. It is shown in this paper that the process is essentially oxidative in nature and, provided that the solvent and rubber are miscible at the temperature of the dissolution, temperature and efficient aeration are the most important rate-determining factors. The nature of the solvent is, of course, of importance with respect to the analytic procedure attempted as all solvents are not suitable for iodine value determination.

scholarly journals Evaluation of Analytical Results Obtained From Standard AOAC Method and Accelerated Wijs Method for the Determination of Iodine Value of Different Brands of Mustard Edible Oils

2020 ◽  
Vol 5 (8) ◽  
pp. 1323-1327
Author(s):  
Dr. Shashikant Pardeshi
Keyword(s):  
Iodine Value ◽  
Edible Oils ◽  
Mercuric Acetate ◽  
Rapid Determination ◽  
Mustard Oil ◽  
Powder Form ◽  
Engine Oils ◽  
Wijs Method ◽  
Aoac Method

In the present work, accelerated method is used for the measurement of iodine value, wherein mercuric acetate is directly used in the powder form. The method only requires to add the catalyst mercuric acetate in the process of determination without changing the operational steps of the Wijs method. Compared with the Wijs method in which it will take at least 30 minutes to finish it, the rapid determination method can make the determination reaction finished in 3 minutes. The iodine value of different vegetable oils such as Kacchighani mustard oil (Kgmu, Dalda),Kacchighani mustard oil (Kgmu1,Mahakosh), Kacchighani mustard oil (Kgmu2,Tez),premium mustard oil kacchighaani (Pmukg, RRO Mustdil), Kacchighani mustard oil (Kgmu3,Nature fresh) and Kacchighani mustard oil (Kgmu4, Engine)oils were determined by regular Wijs method for 30 minutes whereas when we apply catalytic Wijs method with use of 2 mg, 5 mg and 10 mg of mercuric acetate to perform as catalyst then it is reducing the time of analysis to 3 minutes. When catalyst is used the different values obtained for standard deviations are 0.14 for 2mg, 0.27for 5mg and 0.3 for 10 mg whereas 0.35 for non catalyst addition. The results obtained in this present work aremore % difference in IV of pure kacchighani mustard oil (Pkgmu)and Kacchighani mustard oil (Kgmu2).

scholarly journals Potassium Iodate: A New Versatile Reagent to Determine the Iodine Value of Edible Oils

2021 ◽  
Vol 11 (2) ◽  
pp. 3537-3541
Keyword(s):  
Iodine Value ◽  
Edible Oils ◽  
Sodium Thiosulfate ◽  
Fatty Material ◽  
Potassium Iodate ◽  
Standard Methods ◽  
Ethanoic Acid ◽  
Standard Solution ◽  
Versatile Reagent

Iodine value is regarded as one of the essential parameters to establish edible oils' quality and identity. The research paper describes a simple visual titrating procedure to ascertain the iodine number of oils. The method involves adding potassium iodate to polyunsaturated constituents (alkene double bonds) in fatty material along with ethanoic acid, followed by the determination of unreacted potassium iodate by titrating against a standard solution of sodium thiosulfate in the presence of potassium iodide via the iodometric method. The iodine value of various edible oils determined by the new reagent potassium iodate was found to agree with the results of standard methods like the Hnaus method.

scholarly journals Chemometrics in analytical chemistry

2021 ◽  
Vol 9 (2) ◽  
Author(s):  
Darinka Brodnjak Vončina
Keyword(s):  
Analytical Chemistry ◽  
Environmental Samples ◽  
Edible Oils ◽  
Principal Component ◽  
Chemometric Methods ◽  
Prevention Measures ◽  
Mutual Correlation ◽  
Seasonal Behavior ◽  
Linear Discriminant

Chemometrics is a scientific discipline closely connected with statistics and mathematics. It has an important role in analytical chemistry. Modern analytical methods provide opportunity to collect large amounts of data for various samples. For handling analytical results different chemometric methods are employed, such as basic statistical methods for the determination of mean and median values, standard deviations, minimal and maximal values of measured parameters and their mutual correlation coefficients, the principal component analysis (PCA), cluster analysis (CA), and linear discriminant analysis (LDA). The objectives of chemometrics in analytical chemistry are focused on characterization and chemometrical classification of different samples. The quality of environmental samples such as water, sediment, soil, air samples etc. can be determined according to measured physical and chemical parameters, which represent the individual samples. Chemometric methods give information regarding measured parameters about similarity between sampling locations, sources of pollution, seasonal behavior and time trends. Monitoring of general pollution of environmental samples and following measuring parameters which are above permitted level given by legislation can be used for searching of pollution source and for planning prevention measures from pollution. Food samples can also be characterized by chemometrical methods. Chemometrics can be used for fast and efficient determination of food sample categories, such as edible oils, wines, fruits and fruit juices etc. Classification can also be performed according to the origin, source or season. From all these facts it is evident that the aim of chemometrics in analytical chemistry is high and extensive.

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