Supercritical fluid extraction of oils from apple seeds: Process optimization,chemical characterization and comparison with a conventional solvent extraction |
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| Affiliation: | 1. Latvia State Institute of Fruit-Growing, Graudu 1, Dobele LV-3701, Latvia;2. Poznan University of Life Sciences, Faculty of Food Science and Nutrition, Wojska Polskiego 28, 60-623 Poznan, Poland;1. Department of Food Technology, Kongu Engineering College, Perundurai, Erode 638052, TamilNadu, India;2. Department of Food Process Engineering, SRM University, SRM Nagar, Kattankulathur, Chennai 603203, TamilNadu, India;1. Research Centre for Sustainable Process Technology (CESPRO), Faculty of Engineering & Built Environment, Universiti Kebangsaan Malaysia, 43600 UKM, Bangi, Selangor, Malaysia;2. Chemical Engineering Programme, Faculty of Engineering & Built Environment, Universiti Kebangsaan Malaysia, 43600 UKM, Bangi, Selangor, Malaysia;1. Faculty of Pharmacy, International Islamic University Malaysia, Kuantan Campus, 25200 Kuantan, Pahang, Malaysia;2. Faculty of Pharmacy, Cyberjaya University College of Medical Sciences, 63000 Cyberjaya, Malaysia;3. School of Industrial Technology, Universiti Sains Malaysia, Minden, Penang 11800, Malaysia;1. Instituto Superior de Engenharia de Lisboa, Instituto Politécnico de Lisboa, 1959-007 Lisboa, Portugal;2. Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal;3. CERENA, Centro de Recursos Naturais e Ambiente, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal;4. Institute of Chemical Engineering, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria |
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| Abstract: | Oils from apple seeds were extracted with the application of supercritical fluid (SFE) and Soxhlet techniques. The effect of SFE experimental variables such as pressure (10–30 MPa), temperature (40–60 °C) and carbon dioxide flow rate (1–8 L/h) on the yield, antioxidant activity and total phenolic content was investigated using a central composite design. The experimental data were fitted with a second-order polynomial equation using regression analysis. The maximum yield, obtained at the optimum processing conditions (24 MPa, 40 °C, 1 L/h of carbon dioxide flow rate, 140 min) was 20.5 ± 1.5% (w/w). For comparison, the yield from Soxhlet extraction was 22.5 ± 2.5% (w/w). Both techniques produced an oil with a fatty acids profile rich in linoleic acid. However, the extract from SFE was higher in linoleic acid (63.76 ± 4.96 g/100 goil) than that achieved by Soxhlet (49.03 ± 3.85 g/100 goil). Despite the higher unsaturated fatty acids content, SFE extracts reported a higher oxidative stability (21.4 ± 1.2 h) compared to that one extracted by Soxhlet (12.1 ± 1.1 h). This result was expport addressing the extraction of apple seed oil by supercritical fluid at pressures lower tha The most abundant phenolic compound found in the extract was phloridzin (2.96 ± 0.046 μg/gseed in SFE oil and 1.56 ± 0.026 μg/gseed in Soxhlet). Instead, amygdalin, one of the antinutrients present in seeds, was not detected in the SFE oil.Industrial relevanceThe present study provided results addressing the extraction of apple seed oil by supercritical fluid at pressures lower than 30 MPa. The process allowed extracting an oil that was rich in unsaturated fatty acids, oxidative stable thanks to the high antioxidant activity, and free from anti-nutritional compounds. |
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