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The effects of ultrasound pretreatment processes on oil extraction from tomato wastes

Ali Aarabi Arabani, Fakhrisadat Hosseini, Farzin Abbaspour, Navideh Anarjan

Department of Chemical Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran

Department of Chemical Engineering, East Azarbaijan Science and Research Branch, Islamic Azad University, Tabriz, Iran

Biotechnology Group, Biology Sience Faculty, Alzahra University, Tehran, Iran

Faculty of Chemical Engineering, Sahand University of Technology, Tabriz, Iran

Key words: Pretreatment, Ultrasound, Oil extraction, Waste tomato seed.


hqdefaultThe oily seeds are one of the main components of tomato processing wastes which contain the excellent quality of fatty oils, therefore recycling of these by-products is of interest from either environmental viewpoint due to reduction of potential contaminant charge, or nutritional perspective since the health benefits derived from their bio-active compounds. Pretreatment of oily seeds is one of the main processes of their oil extraction, leading to considerable increase in oil extraction efficiency. The results of this study showed that using combination of ultrasound pretreatment with other physical methods could weaken the particle surface bonds and enhance the extraction yield effectively. The highest improvement in oil extraction from tomato waste seeds was about 28.11% by using ground waste seeds with hot water immersion (25-40C0) and ultrasound (at 550w, 37kHz 90 min). Although the ultrasound pretreatment didn’t affect the fatty acids structure and physicochemical characteristics negatively, it also could improve it in some cases.

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