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The determination of specific free fatty acids in peanut oil by gas chromatography
Author(s) -
Phillips Richard J.,
Singleton Bert
Publication year - 1978
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02676929
Subject(s) - chemistry , chromatography , oleic acid , hydrolysis , gas chromatography , sodium iodide , relative standard deviation , peanut oil , iodide , dimethylformamide , methyl iodide , organic chemistry , biochemistry , detection limit , raw material , solvent
Peanut oil is dissolved in 2,2,4‐trimethylpentane standard. The free acids are extracted into N,N‐dimethylformamide as their sodium salts and treated with methyl iodide. The resulting methyl esters are analyzed by gas chromatography. A typical result for oleic acid is about 200 ppm with a relative standard deviation of 6%. An average recovery of 95% is obtained from a sample spiked with an additional 200 ppm of oleic acid. Evidence is presented that the procedure does not give high values as a result of sample hydrolysis.