A modified method for determining free fatty acids from small soybean oil sample sizes |
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| Authors: | I H Rukunudin P J White C J Bern T B Bailey |
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| Affiliation: | (1) Department of Food Science and Human Nutrition, Iowa State University, Ames, Iowa;(2) Department of Agricultural and Biosystems Engineering, Iowa State University, Ames, Iowa;(3) Department of Statistics, Iowa State University, Ames, Iowa |
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| Abstract: | A modification of the AOCS Official Method Ca 5a-40 for determination of free fatty acids (FFA) in 0.3 to 6.0-g samples of
refined and crude soybean oil is described. The modified method uses only about 10% of the weight of oil sample, alcohol volume,
and alkali strength recommended in the Official Method. Standard solutions of refined and crude soybean oil with FFA concentrations
between 0.01 and 75% were prepared by adding known weights of oleic acid. The FFA concentrations, determined from small sample
sizes with the modified method, were compared with FFA percentages determined from larger sample sizes with the Official Method.
Relationships among determinations obtained by the modified and official methods, for both refined and crude oils, were described
by linear functions. The relationship for refined soybean oil had an R
2 value of 0.997 and a slope of 0.99±0.031. The values for crude soybean oil are defined by a line with R
2=0.9996 and a slope of 1.01±0.013. |
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| Keywords: | Crude soybean oil free fatty acid Official Method refined soybean oil titration |
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