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Comparative study of methods of determining oil content of sunflower seed
Author(s) -
Robertson J. A.,
Windham W. R.
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/bf02659781
Subject(s) - sunflower seed , sunflower , sunflower oil , extraction (chemistry) , chemistry , gravimetric analysis , significant difference , chromatography , palm oil , near infrared spectroscopy , analytical chemistry (journal) , vegetable oil , mathematics , food science , biology , statistics , organic chemistry , combinatorics , neuroscience
An extraction‐gravimetric method (AOCS Official Method Ai 3‐75) was compared with 2 instrumental techniques, near‐infrared reflec‐tance (NIR) spectroscopy and wide‐line nuclear magnetic resonance (NMR), for the determination of the oil content of oilseed‐type hybrid sunflower seed. Eight sunflower seed samples of varying oil contents, replicated 5 times, were analyzed by the 3 procedures. The overall mean oil contents and standard deviations for the 8 samples were: AOCS method, 44.5% ± 0.33%; NMR, 44.8% ± 0.27%; and NIR, 44.2% ± 0.81%. Analysis of variance of the means of the 3 methods of analysis indicated no difference (p>0.05) in oil content due to the method. However, there was a difference (p>0.001) in total oil content due to replicated analyses of the same sample with the NIR method. With the AOCS and NMR methods, no effect (p>0.05) of replicated analyses of the same sample was found. The NMR method was more precise and repro‐ducible than the other 2 methods. Although the NIR mean oil contents were not significantly different from the means of the other 2 methods, the coefficient of variations for all samples were consistently higher for the NIR analyses than for the AOCS and NMR analyses.