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  1. Journal of the American Oil Chemists' Society
  2. Journal of the American Oil Chemists' Society : Volume 81
  3. Journal of the American Oil Chemists' Society : Volume 81, Issue 5, May 2004
  4. New FTIR method for the determination of FFA in oils
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Journal of the American Oil Chemists' Society : Volume 94
Journal of the American Oil Chemists' Society : Volume 93
Journal of the American Oil Chemists' Society : Volume 92
Journal of the American Oil Chemists' Society : Volume 91
Journal of the American Oil Chemists' Society : Volume 90
Journal of the American Oil Chemists' Society : Volume 89
Journal of the American Oil Chemists' Society : Volume 88
Journal of the American Oil Chemists' Society : Volume 87
Journal of the American Oil Chemists' Society : Volume 86
Journal of the American Oil Chemists' Society : Volume 85
Journal of the American Oil Chemists' Society : Volume 84
Journal of the American Oil Chemists' Society : Volume 83
Journal of the American Oil Chemists' Society : Volume 82
Journal of the American Oil Chemists' Society : Volume 81
Journal of the American Oil Chemists' Society : Volume 81, Issue 12, December 2004
Journal of the American Oil Chemists' Society : Volume 81, Issue 11, November 2004
Journal of the American Oil Chemists' Society : Volume 81, Issue 10, October 2004
Journal of the American Oil Chemists' Society : Volume 81, Issue 9, September 2004
Journal of the American Oil Chemists' Society : Volume 81, Issue 8, August 2004
Journal of the American Oil Chemists' Society : Volume 81, Issue 7, July 2004
Journal of the American Oil Chemists' Society : Volume 81, Issue 6, June 2004
Journal of the American Oil Chemists' Society : Volume 81, Issue 5, May 2004
Kinetic study of the base-catalyzed transesterification of monoglycerides from pongamia oil
$^{1}$H NMR characterization of milk lipids: A comparison between cow and buffalo milk
Direct analysis of Ca, P, and Fe in oleochemicals by inductively coupled plasma MS
New FTIR method for the determination of FFA in oils
Acorn (Quercus spp.) fruit lipids: Saponifiable and unsaponifiable fractions: A detailed study
Impact of oxidized off-flavor of ice cream prepared from milk fat
Effect of triacylglycerol structures on the thermal oxidative stability of edible oil
Lignans and tocopherols in Indian sesame cultivars
Phospholipids from palm-pressed fiber
Catalytic epoxidation of methyl linoleate
Products of the surface oxidation of methyl linoleate
Investigation of soy protein-kymene$^{®}$ adhesive systems for wood composites
Adsorption of FFA in crude catfish oil onto chitosan, activated carbon, and activated earth: A kinetics study
Kinetics of transesterification of palm-based methyl esters with trimethylolpropane
Dehydration of glycerin/water mixtures by pervaporation using homo and copolymer membranes
Prediction of crude sunflower oil deterioration after seed drying and storage processes
Irradiation bleaching of palm oil, palmolein, and palm stearin
The T/2V $^{1/2}$ ratio: Solubility parameter substitute
Journal of the American Oil Chemists' Society : Volume 81, Issue 4, April 2004
Journal of the American Oil Chemists' Society : Volume 81, Issue 3, March 2004
Journal of the American Oil Chemists' Society : Volume 81, Issue 2, February 2004
Journal of the American Oil Chemists' Society : Volume 81, Issue 1, January 2004
Journal of the American Oil Chemists' Society : Volume 80
Journal of the American Oil Chemists' Society : Volume 79
Journal of the American Oil Chemists' Society : Volume 78
Journal of the American Oil Chemists' Society : Volume 77
Journal of the American Oil Chemists' Society : Volume 76
Journal of the American Oil Chemists' Society : Volume 75
Journal of the American Oil Chemists' Society : Volume 74

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New FTIR method for the determination of FFA in oils

Content Provider Springer Nature Link
Author Al Alawi, Ahmed Voort, Frederick R. Sedman, Jacqueline
Copyright Year 2004
Abstract A rapid, practical, and accurate FTIR method for the determination of FFA in edible oils was developed. Analogous to the AOCS titration procedure, the FTIR FFA determination is effected by an acid/base reaction but directly measures the product formed rather than utilizing an end point based on an electrode potential or color change. A suspension of a weak base, potassium phthalimide (K-phthal) in 1-propanol (1-PrOH), is used to convert the FFA present in oils to their carboxylate salt without causing oil saponification, and differential spectroscopy is used to circumvent matrix effects. Samples are first diluted with 1-PrOH, then split, with one-half treated with the K-phthal reagent and the other half with 1-PrOH (blank reagent), their spectra collected, and differential spectra obtained to ratio out the invariant spectral contributions from the oil sample. Quantification of the percentage of FFA in the oil, expressed as %oleic acid, based on measurement of the peak height of the ν (COO$^{−}$) absorption of the FFA salt formed, yielded a calibration with an SE of <0.020% FFA over the range of 0–4%. The method was validated by standard addition and the analysis of Smalley check samples, the results indicating that the analytical performance of the FTIR procedure is as good as or better than that of the standard titrimetric procedure. As structured, the FTIR procedure is a primary method, as calibration is not dependent on reference values provided by another method, and has performance criteria that could lead to its consideration as an instrumental AOCS procedure for FFA determination. The FTIR portion of the analysis is automatable, and a system capable of analyzing ∼60 samples/h was developed that could be of benefit to laboratories that carry out a large number of FFA analyses per day.
Starting Page 441
Ending Page 446
Page Count 6
File Format PDF
ISSN 0003021X
Journal Journal of the American Oil Chemists' Society
Volume Number 81
Issue Number 5
e-ISSN 15589331
Language English
Publisher Springer-Verlag
Publisher Date 2004-01-01
Publisher Place Berlin, Heidelberg
Access Restriction One Nation One Subscription (ONOS)
Subject Keyword Automated analyses edible oils FFA FTIR potassium phthalimide 1-propanol Chemistry/Food Science Analytical Chemistry Biotechnology Industrial Chemistry/Chemical Engineering Biomaterials Agriculture
Content Type Text
Resource Type Article
Subject Organic Chemistry Chemical Engineering
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