Effects of extraction techniques on the quality properties and  lipid concomitants of flaxseed oil

Abstract

Abstract: This study aimed to investigate the effects of extraction techniques, including cold pressing, microwave pretreatment coupled with cold-pressed, accelerated solvent extraction, supercritical CO2 extraction, and subcritical fluid extraction on the yield, physicochemical properties, typical lipid concomitants content, oxidation stability and in vitro antioxidant capacity of flaxseed oil.The results showed that the microwave pretreatment coupled with cold-pressed method significantly increased the yield of flaxseed oil, which was 4.3%-10.66% higher when compared with other techniques（P＜0.05）. The supercritical CO2 extraction possessed a better potential on the accumulation of α-linolenic acid in flaxseed oil (54.06%), which was 3.70%-5.31% higher than other techniques（P＜0.05）. Moreover, the different extraction techniques had specific effect on the typical lipid concomitants in flaxseed oil. The highest content of tocopherols, carotenoids, chlorophyll, flavonoids and phospholipids was found in flaxseed oils obtained by accelerated solvent extraction and microwave pretreatment coupled with cold-pressed method. The subcritical fluid extraction significantly increased the contents of phytosterols in flaxseed oil (429.78599.33 mg/100 g), which was 5.07%-30.26%8.50%~%-68.48% higher than other techniques (P＜0.05). The flaxseed oil obtained by the supercritical CO2 extraction possessed the maximum total phenol contents (13.60 mg/100 g) when compared with other techniques. Notably, the extraction techniques had significant effects on the in vitro antioxidant capacity and oxidation stability of flaxseed oil (P＜0.05). The accelerated solvent extraction and microwave pretreatment coupled with cold-pressed flaxseed oils showed the highest oxidation stability and DPPH radical scavenging capacity than oils obtained by cold-pressed, subcritical fluid extraction and supercritical CO2 extraction, but supercritical CO2 extraction flaxseed oils has a strong iron ion reduction ability.. These results advocate the use of microwave pretreatment and accelerated solvent extraction for optimized flaxseed oil extraction.

Key words: extraction techniques, flaxseed oil, lipid concomitants, antioxidant capacity, oxidative stability

Kun YU Chun QianDENG. Effects of extraction techniques on the quality properties and lipid concomitants of flaxseed oil[J]. , 0, (): 0-0.

References

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Effects of extraction techniques on the quality properties and lipid concomitants of flaxseed oil

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