Abstract
: In order to prevent the oxidation of linseed oil and emulsification during extraction process, Nitrogen-protected and Salt-Assisted Aqueous Extraction (NSAE) of linseed oil was investigated in this study. Nitrogen-protected and salt-assisted were found to be the most effectively in weakening oil oxidation and improving the oil yield, respectively. The highest oil recovery of 87.55% was achieved under optimal conditions of sodium carbonate solution concentration (2 mol/L), solution-to-flour ratio (10 mL/g) and temperature (60°C). Moreover, there were no significant variations in physicochemical properties of Nitrogen-protected and Salt-assisted Aqueous Extracted Oil (NSAEO) and Salt-Assisted Aqueous Extracted Oil (SAEO), but NSAEO showed better oxidation stability. Additionally, NSAEO had a higher content of linoleic acid (18.97±0.05%), α-linolenic acid (56.48±0.12%). Therefore, NSAEO is a promising and environmental-friendly technique for oil extraction in the food industry.
Highlights
Linseed is an important oil crop cultivated worldwide for oil and fiber
Linseed contains approximately 200~250 g/kg crude protein and 400~ 430 g/kg oil, consisting a potential source of protein and energy to be used in animal feeding (Collins et al, 2011; Boylston et al, 1996; Doreau et al, 2009)
It is an excellent source of omega-3 fatty acid, which makes about 55~60% of total fatty acid (Rodriguez et al, 2010; Leyva et al, 2011; Yang and Luo, 2013; Mueller et al, 2010; Choo et al, 2007; Nykter et al, 2006; Herchi et al, 2012)
Summary
Linseed ( known as flaxseed) is an important oil crop cultivated worldwide for oil and fiber. The purpose of this study is to explore the optimal condition of oil extraction process on quantity and quality of linseed oil, with the help of the response surface methodology. Grinded the linseed and obtained mills pass through a 20 mesh sieves, which were measured 10 g meals into stopper flask and commixed with distilled water at a designed ratio (8:1, v/w), prepared sodium carbonate solution (2 mol/L) were added and the nitrogen were inlet the mixtures with the speed of 0.2 m3/h, followed the above steps, the samples were kept in a homoiothermy oscillator water bath (the temperature were set for 70°C and the vibration were at 160 r/m for 2 h), the emulsion phase was centrifuged at 4000 rpm for 15 min to get free oil.
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