High stearic high oleic sunflower oil extraction: Influence of temperature, moisture and dehulling on kinetic parameters

DE FIGUEIREDO, A. K.; FERNANDEZ, M. B.; NOLASCO, S.M.

EUROPEAN JOURNAL OF LIPID SCIENCE AND TECHNOLOGY

WILEY-V C H VERLAG GMBH

Lugar: Weinheim; Año: 2023

1438-7697

In the present work, the influence of temperature, moisture content and dehulling on the kinetic parameters of the oil extraction of high stearic high oleic (HSHO) sunflower seeds was analyzed. A modified Fick´s diffusion model that considers extraction as the sum of two components (diffusion and washing) was used. The washing fraction (M0/M∞) and diffusion coefficients (Deff) were calculated taking into account the number of terms appropriate to each case. The statistical analysis showed a dependence of M0/M∞ on temperature in the 40–50°C range, while no statistical differences were detected in the 50–60°C range. Although there were changes in the model parameters with the moisture content of the seeds (7.8, 6.9 and 4.8% dry basis), no specific trend was evidenced. The effective diffusion coefficient for the dehulled sample (1.48 ± 0.13.10−12 m2.s−1) was 60% higher than that of the unshelled sample (0.95 ± 0.05.10−12 m2.s−1). The extraction kinetics of tocopherols at 50°C was also analyzed. Practical Application: The manuscript performs an analysis of different factors that influence the extraction of oil from high stearic and high oleic sunflower seeds (HSHO), which directly affect the efficiency of the oil extraction process. The results of this study provide useful information for a joint evaluation of oil extraction yields and costs resulting from the processing of a non-conventional sunflower hybrid, promoting, in addition, the development of healthy high value-added oils.