Lupinus mutabilis oil obtained by expeller press: Yield, physicochemical characterization, antioxidant capacity, fatty acids and oxidative stability analyses

The oil of debittered and dehulled grains from two Andean lupins (Lupinus mutabilis) from Peru, Andenes and Cornirn, was extracted by expeller press. The extraction yield and the proximal composition of both varieties were assessed. The oil and the cake, as well as the defatted flour from the variety with the highest extraction yield, were characterised for physico-chemical properties, total polyphenol content and antioxidant capacity. The oil shelf-life at 25 degrees C was extrapolated by Rancimat test. Andenes presented an oil yield of 22.1% (vs. 18.4% of Cornirn), CIELAB colour coordinates of L* = 36.5, a* = 2.2, b* = 20, refractive index and density at 25 degrees C of 1.469 and 0.903 g/mL, acid number of 32 mg KOH/g, free fatty acids content of 1.6%, peroxide number of 2.7 megO(2)/kg, p-anisidine number of 1.3, unsaponificable content of 58%, total antioxidant capacity 21.4 mu mol TE/g and total polyphenol content of 7.0 mg AGE/100 g. The predominant fatty acid, tocopherol and phytosterol in the oil were oleic acid (562%), gamma-tocopherol (555 mg/kg) and beta-sitosterol (41900 mg/100 g), respectively. The oil shelf-life at 25 degrees C was 2.7 years. The Lupinus mutabilis oil extracted by expeller presented an acceptable quality with a lower environmental negative impact than the oils obtained by solvent extraction.

Automated summary

The oil from two Andean lupins (Lupinus mutabilis) varieties from Peru, Andenes and Cornirn, was extracted by expeller press. The study evaluated the extraction yield, proximal composition, physico-chemical properties, total polyphenol content, and antioxidant capacity of the oils. Andenes variety showed higher oil yield, better quality, and higher antioxidant capacity.