Prediction of crude sunflower oil deterioration after seed drying and storage processes |
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Authors: | M?M?Bax M?C?Gely Email author" target="_blank">E?M?SantallaEmail author |
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Affiliation: | (1) Seeds Technology Program (TECSE), Chemical Engineering Department Facultad de Ingeniería, Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA), Av. Del Valle 5737, B7400JWI Olavarría, Argentina |
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Abstract: | The effects of air-drying temperature and storage time on several characteristics of crude sunflower oil were evaluated in
terms of FFA and PV. Long storage affected oil content to a greater extent than air-drying temperature. FFA and PV varied
between 0.53 and 1.22% and between 10.7 and 23.3. meq O2/kg, respectively, when samples of uniform initial moisture content (approximately 28%) were dried at various temperatures
between 25 and 90°C to approximately 7% moisture content, stored for 8 mon, and then analyzed. Both oil quality characteristics
increased exponentially with air-drying temperature (T) and linearly with storage time (t). Mathematical functions of the form A·exp(B·T)+C·t (where A, B, and C are parameters adjusted from experimental data) most closely predicted the experimental loss of quality of sunflower oil
in terms of FFA and PV with variations in T and t. Statistical analysis showed SE of the estimated parameters of 0.08 and 1.19 and coefficients of determination, R
2, of 0.922 and 0.939 for FFA and PV, respectively, which were significant at 95% confidence. High-oleic seeds from a similar
experiment were used to validate the proposed equation. The results of applying the mathematical function proposed above showed
a reasonable ability to predict the experimental values with SE of 0.037 and 0.808 and R
2 of 0.983 and 0.972 for FFA and PV, respectively, which were significant at 95% confidence. Plots of residuals showed random
distribution. The results obtained suggested that the equation proposed could be used as a quality-loss model in sunflower
drying simulations. |
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Keywords: | Deterioration models drying free fatty acids oil content peroxide value storage sunflower |
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