scholarly journals A New Method for the Determination of the Total Fatty Acids and Other Ether-Soluble Constituents of Feedstuffs

1915 ◽  
Vol 7 (3) ◽  
pp. 218-220
Author(s):  
J. B. Rather
Keyword(s):  
Fatty Acids ◽  
New Method ◽  
Total Fatty Acids

QUANTITATIVE ANALYSIS OF FATTY ACIDS IN VULCANIZED STYRENE–BUTADIENE RUBBER BY THERMAL DESORPTION AND THERMALLY ASSISTED HYDROLYSIS AND METHYLATION-GC/MS

2014 ◽  
Vol 87 (3) ◽  
pp. 516-525 ◽  
Author(s):  
Atsushi Watanabe ◽  
Chu Watanabe ◽  
Robert Freeman ◽  
Mari Nakajima ◽  
Norio Teramae ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Thermal Desorption ◽  
Methyl Esters ◽  
Analytical Data ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Relative Standard ◽  
Total Fatty Acids ◽  
Styrene Butadiene

ABSTRACT Determination of stearic acid in rubber is very important from the viewpoint of quality control of products. In place of the conventional liquid-phase extraction procedures for the analysis of additives in rubber, stearic and palmitic acids in vulcanized styrene–butadiene rubber (SBR) samples were directly analyzed in the solid state by thermal desorption (TD)–gas chromatography (GC)/mass spectrometry (MS) and thermally assisted hydrolysis and methylation (THM)–GC/MS. It was found that the precision of analytical data was only fair in the TD-GC/MS analysis, with 7.8% relative standard deviation (RSD), because of the interaction between the polar fatty acids and basic sites in the GC chromatographic system. On the other hand, THM-GC/MS, in which the fatty acids are derivatized to the methyl esters using tetramethylammonium hydroxide, can overcome this problem. Under the optimized measurement conditions of this study for THM-GC/MS, the average determined value (0.62 wt%) of total fatty acids in the SBR samples was found to agree well with the compounded amount (0.64 wt%) used in the preparation stage of the SBR samples, and the RSD was 3.2%.

scholarly journals A New Method for the Determination of Fat and Fatty Acids in Feces

1910 ◽  
Vol 7 (6) ◽  
pp. 421-426
Author(s):  
Otto Folin ◽  
A.H. Wentworth
Keyword(s):  
Fatty Acids ◽  
New Method

THE TITRIMETRIC DETERMINATION OF PLASMA FATTY ACIDS

1951 ◽  
Vol 29 (5) ◽  
pp. 239-244
Author(s):  
Edouard Pagé ◽  
Loraine Michaud
Keyword(s):  
Fatty Acids ◽  
Blood Plasma ◽  
Plasma Lipids ◽  
Benzene Solution ◽  
Ammonium Hydroxide ◽  
Thymol Blue ◽  
Tetramethyl Ammonium Hydroxide ◽  
Total Fatty Acids ◽  
Titrimetric Determination

A method is described for the determination of total fatty acids in small amounts of blood plasma. The plasma lipids are extracted in an alcohol–acetone mixture. Following saponification and hydrolysis, the fatty acids from an aliquot of their benzene solution are dissolved in alcoholic thymol blue and titrated with tetramethyl ammonium hydroxide as recommended by Schmidt–Nielsen. The method is applicable to the study of alimentary hyperlipemia in rats.

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