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An automatized method for determination of free fatty acids
Author(s) -
Ekström LarsGösta
Publication year - 1981
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/bf02659662
Subject(s) - chromatography , chemistry , linear relationship , sample (material) , flow injection analysis , phase (matter) , analytical chemistry (journal) , fatty acid , linear range , mathematics , detection limit , statistics , biochemistry , organic chemistry
Abstract An automated colorimetric method is described for determining free fatty acids (FFA) in vegetable oils using the flow injection analysis (FIA) technique. In this procedure, an almost linear relationship exists between the peak height and the FFA concentration. Liquid samples can be poured directly into the sample cups on the sampler for an automatic analysis of the FFA content. The dynamic range of this method is from 0.01 to almost 5%. Samples with higher FFA content must be diluted before analysis. The sample capacity is 12–20 injections/hr. No evidence of the existence of the earlier proposed cage‐like complex (Cu(II)(FFA) 2 ) 2 in the organic phase was observed in this study.