Naslov
Optimization of walnut oil production

Autori
Jokić, Stela ; Moslavac, Tihomir ; Bošnjak, Andreja, Aladić, Krunoslav ; Rajić, Marina ; Bilić, Mate

Izvornik
Croatian journal of food science and technology (1847-3466) 6 (2014), 1; 27-35

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
walnut oil ; screw pressing ; supercritical CO2 extraction ; oil quality ; tocopherols ; optimization

Sažetak
Walnut is recognized worldwide as a functional health food. In the walnut oil production it is very important to find an appropriate method to recover the oil from seeds. Walnut oil in this study was obtained by pressing the seeds followed by extraction with supercritical CO2. The effects of pressing temperature (70, 85, 100 °C), frequency (20, 30, 40 Hz) and nozzle size (8, 10, 12 mm) in pressing experiments on oil recovery and oil temperature were monitored. The optimal calculated pressing condition within the experimental range of the variables studied was determined. In obtained walnut oil the following parameters were analyzed: peroxide value, free fatty acids, insoluble impurities, moisture content, iodine value, saponification value, p- anisidine value and Totox value. The residual oil from pressed cake obtained at optimal conditions was extracted with CO2 with a goal to extract tocopherols residue from walnut after applied screw press process. Content of tocopherols in walnut oil and oil extracted by supercritical CO2 were compared.

Izvorni jezik
Engleski

Znanstvena područja
Prehrambena tehnologija

POVEZANOST RADA