Combined effect of ohmic heating and enzyme assisted aqueous extraction process on soy oil recovery

Abstract

This research describes a new technological process for soybean oil extraction. The process deals with the combined effect of ohmic heating and enzyme assisted aqueous oil extraction process (EAEP) on enhancement of oil recovery from soybean seed. The experimental process consisted of following basic steps, namely, dehulling, wet grinding, enzymatic treatment, ohmic heating, aqueous extraction and centrifugation. The effect of ohmic heating parameters namely electric field strength (EFS), end point temperature (EPT) and holding time (HT) on aqueous oil extraction process were investigated. Three levels of electric field strength (i.e. OH600V, OH750V and OH900V), 3 levels of end point temperature (i.e. 70, 80 and 90°C) and 3 levels of holding time (i.e. 0, 5 and 10 min.) were taken as independent variables using full factorial design. Percentage oil recovery from soybean by EAEP alone and EAEP coupled with ohmic heating were 53.12 % and 56.86 % to 73 % respectively. The maximum oil recovery (73 %) was obtained when the sample was heated and maintained at 90°C using electric field strength of OH600V for a holding time of 10 min. The free fatty acid (FFA) of the extracted oil (i.e. in range of 0.97 to 1.29 %) was within the acceptable limit of 3 % (oleic acid) and 0.5-3 % prescribed respectively by PFA and BIS.

Extraction from Food and Natural Products by Moderate Electric Field: Mechanisms, Benefits, and Potential Industrial Applications

“…A basic batch‐type MEF extractor system consists of a power supply, an extraction cell, two electrodes, and a data logger along with temperature and electrical sensors (Figure ). A temperature control system is also required whenever an extraction process at controlled low temperatures is desired (Boonchoo, Tongprasan, Tangduangdee, & Asavasanti, ; Lebovka, Praporscic, Ghnimi, & Vorobiev, ; Pare et al., ; Praporscic, Lebovka, Ghnimi, & Vorobiev, ; Saberian et al., , b; Tongprasan et al., ). The system may also be equipped with a variable transformer and a frequency transformer to adjust the electric field strength and applied frequency, respectively (Gavahian et al., ; Ramaswamy et al., ).…”

“…Therefore, industries are seeking alternative methods which can satisfy the demand for higher production rates, while reducing production costs associated with the increasing price of energy (Chemat, Rombaut, Fabiano‐Tixier, Pierson, & Bily, ). Thus, various alternative extraction techniques are being investigated, including ultrasound (Vinatoru et al., ), supercritical fluids (Paula et al., ), pulsed electric field (Fincan, DeVito, & Dejmek, ), microwave (Eskilsson & Björklund, ), and moderate electric field (MEF) (Aamir & Jittanit, ; Al‐Hilphy, AlRikabi, & Al‐Salim, ; Coelho, Pereira, Teixeira & Pintado, ; El Darra, Grimi, Vorobiev, Louka, & Maroun, ; Fraccola et al., ; Khuenpet, Fukuoka, Jittanit, & Sirisansaneeyakul, ; Kowittaya & Asavasanti, ; Lakkakula, Lima, & Walker, ; Loypimai, Moongngarm, Chottanom, & Moontree, ; Nair et al., ; Pare, Nema, Singh, & Mandhyan, ; Pereira et al., ; Saberian, Hamidi‐Esfahani, Gavlighi, Banakar, & Barzegar, ; Saberian, Hamidi‐Esfahani, Gavlighi, & Barzegar, ; Sakharam, Pandey, Singh, Kumar, & Shukla, ; Salengke et al., ; Sensoy & Sastry, ; Tongprasan, Tangduangdee, Soontrunnarudrungsri, Yasurin, & Asavasanti, ; Zhu, Bals, Grimi, Ding, & Vorobiev, ).…”

Ohmic heating as a pre-treatment in solvent extraction of rice bran

“…Free fatty acid content of bran increases rapidly during storage. Therefore it is necessary that the collection and extraction processes are really quick since any delay may result in the rancidity of the oil extracted and therefore the oil obtained will not be of edible grade (Pare et al 2012;Nguyen et al 2012). The composition of rice bran is as follows; Protein-6.7-11.5 %, fat-4.7-12.8 %, fibre-6.2 %, ash-8 %, N.F.E.…”

Optimization of conditions for producing high‐quality oil and de‐oiled meal from almond seeds by water

“…Extraction by solvent appears to be the most commonly used method on a commercial scale, which recovers oils with very high yield (Johnson, 2000;Lamsal, Murphy, & Johnson, 2006;Pare, Nema, Singh, & Mandhyan, 2014). However, this method has the following disadvantages: (1) not environmental friendly; (2) potential of explosion or fire; (3) the extracted oils requiring refining for safe consumption; (4) high cost in operation; (5) adverse effect of solvent on human health (Environmental Protection Agency, 1999;Latif & Anwar, 2009;Tu, Wu, Yang, Li, & Ma, 2017).…”