By Carter Litchfield
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Additional info for Analysis of Triglycerides
Specific for ester linkages. Semiautomated procedure described in 30a. Slightly less a c c u r a t e t h a n G L C of m e t h y l esters or triglycerides. 330, 933, 46, 133, 161, 282, 350, 917 611, 841, 936 33, 387, 413, 746, 771 538, 567 F a s t e s t . m e t h o d if t r i g l y c e r i d e carbon number distributions are d e t e r m i n e d b y G L C . 5 85, 176, 977 References F a s t e s t m e t h o d if f a t t y acid a n a l y s e s are r u n b y G L C . -Phenazobenzoyl chloride Phenylhydrazine Saponify, acidulate, and remove fatty acids.
Sample recovery is the more useful technique, since the fatty acid composition of each fraction can then be determined. The usual diethyl ether extraction of the silicic acid is supplemented by treatment with chloride ion to ensure complete breakup of the Ag+ complexes with the more unsaturated triglycerides (369, 403, 740,772). Hill et al. (369) recommend the following procedure: Triglyceride bands are visualized under ultraviolet light after spraying with 0 . 1 % 2',7'-dichlorofluorescein solution.
Alternatively, saponify, acidulate, isolate fatty acids, and react with 1C4 - d i a z o m e t h a n e , 63 0 N i ( N O s ) 2 , or 6Co(NO3)2. Isolate methyl esters and measure radioactivity. Radioactivity Weight GLC Detector Deposit eluate on moving wire or chain and evaporate solvent. Measure nonvolatile material directly or as its pyrolysis or combustion products in GLC detector. 1 500 <1 M o s t sensitive procedure available. Inorganic salts not suitable for < C i 4 acids, M o s t l y for column chromatography work.
Analysis of Triglycerides by Carter Litchfield