Abstract
Flaxseed oil (FO) is known as a fine source of α-linolenic acid. However, the quality of flaxseed oil is partially contributed to the contents of lipophilic concomitants except for fatty acids. In this research, effect of four extraction methods such as the solvent extraction (SE), the hot pressing (HP), the cold pressing (CP) and the aqueous enzymatic extraction (AE) were investigated on the quality of flaxseed oil. The results showed that the total contents of cyclolinopeptides (CLs) in pressed oils (CPFO, 504.04 μg/g oil; HPFO, 631.41 μg/g oil) were nearly twice that of AEFO and SEFO, and CPFO had a high content of γ-tocopherol (46.51 mg/100 g oil). However, the oil yield of CP was 22.2 %, lower than that of AE (30.3 %), and the phytosterols content of AEFO (347.56 mg/100 g oil) was higher than the pressed oils. Both CPFO and AEFO had a high squalene content, but a low phospholipid content, they were pale yellow, and could be consumed without refining. In conclusion, CPFO could serve as a source of CLs, and AEFO could retain more lipophilic concomitants with a high oil yield, indicating different oil extraction methods provided different strategies for commercial processing of flaxseed oil based on the purpose.
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