LAPSE:2020.0562
Published Article
LAPSE:2020.0562
Investigation of Heating and Freezing Pretreatments on Mechanical, Chemical and Spectral Properties of Bulk Sunflower Seeds and Oil
Gürkan Alp Kağan Gürdil, Abraham Kabutey, Kemal Çağatay Selvi, Petr Hrabě, David Herák, Adéla Fraňková
June 10, 2020
The present study examined the effects of heating and freezing pretreatments on the mechanical, chemical, and spectral characteristics of sunflower seeds and oil under a linear compression process involving a universal compression-testing machine and a pressing vessel of diameter 60 mm with a plunger. The heating temperatures ranged from 40 to 80 °C and freezing temperatures from −2 to −36 °C at constant heating time of 30 min. The pretreated samples of initial height of 80 mm (22.6 × 10−5 m3) were compressed under a preset load of 100 kN and a speed of 5 mm/min. The results showed that oil expression efficiency significantly increased (p < 0.05) with increased heating temperatures but decreased with freezing temperatures. The lowest energy per volume oil of 22.55 ± 0.919 kJ/L was recorded at 80 °C compared to 26.40 ± 0.307 kJ/L noticed at −2 °C and control (25 °C) of 33.93 ± 3.866 kJ/L. The linear regression equations expressing oil expression efficiency, energy per volume oil, peroxide value, and free fatty acid, dependent on heating and freezing temperatures, were described with coefficients of determination between 0.373 and 0.908. Increased heating temperatures increased the UV absorption rate of the oil samples at a wavelength of 350 nm. The study is part of the continuing research on linear compression modeling of all processing factors, whereby the results are intended to be applied to the non-linear process dealing with a mechanical screw press to improve the oil extraction process.
Keywords
energy demand, linear compression, oil expression efficiency, oil quality, oil-bearing crop
Subject
Suggested Citation
Gürdil GAK, Kabutey A, Selvi K?, Hrabě P, Herák D, Fraňková A. Investigation of Heating and Freezing Pretreatments on Mechanical, Chemical and Spectral Properties of Bulk Sunflower Seeds and Oil. (2020). LAPSE:2020.0562
Author Affiliations
Gürdil GAK: Department of Mechanical Engineering, Faculty of Engineering, Czech University of Life Sciences Prague, 16521 Prague, Czech Republic [ORCID]
Kabutey A: Department of Mechanical Engineering, Faculty of Engineering, Czech University of Life Sciences Prague, 16521 Prague, Czech Republic [ORCID]
Selvi K?: Department of Mechanical Engineering, Faculty of Engineering, Czech University of Life Sciences Prague, 16521 Prague, Czech Republic
Hrabě P: Department of Materials and Manufacturing Technology, Faculty of Engineering, Czech University of Life Sciences Prague, 16521 Prague, Czech Republic
Herák D: Department of Mechanical Engineering, Faculty of Engineering, Czech University of Life Sciences Prague, 16521 Prague, Czech Republic [ORCID]
Fraňková A: Department of Food Science, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, 16521 Prague, Czech Republic
Journal Name
Processes
Volume
8
Issue
4
Article Number
E411
Year
2020
Publication Date
2020-03-31
Published Version
ISSN
2227-9717
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Original Submission
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PII: pr8040411, Publication Type: Journal Article
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LAPSE:2020.0562
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doi:10.3390/pr8040411
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Jun 10, 2020
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CC BY 4.0
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Jun 10, 2020
 
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Calvin Tsay
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