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 Común, was extracted by expellerpress. The extraction yield and the proximal composition of both varieties were assessed. The oil and the cake, as well as the defatted flour from thevariety with the highest extraction yield, werecharacterised for physico-chemical properties, total polyphenol content andantioxidant capacity. Theoil shelf-life at 25 °C was extrapolated by Rancimat test. Andenes presented an oil yield of 22.1% (vs. 18.4% of Común), CIELAB colour coordinates ofL* = 36.5, a* = 2.2, b* = 20, refractive index and density at 25 ºC of 1.469 and 0.903 g/mL, acid number of 3.2 mg KOH/g, free fatty acids content of1.6%, peroxide number of 2.7 meqO2/kg, p-anisidine number of 1.3, unsaponificable content of 58%, total antioxidant capacity 21.4 μmol 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 (56.2%), γ-tocopherol (555 mg/kg) and β-sitosterol (41900 mg/100 g), respectively. The oil shelf-life at 25 ºC 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

Effect of time and temperature on bioactive compounds in germinated Brazilian soybean cultivar BRS 258.

The objective was to determine the effect of time and temperature on the concentration of bioactive compounds during germination of Brazilian soybean cultivar BRS 258. The concentration of bioactive compounds was optimized using Response Surface Methodology, with a 22 central composite rotational design and germination time and temperature as independent variables. Germination was carried out in a germination chamber, using paper in trays containing 500 g of seeds. Germination temperature and time modified the concentrations of bioactive compounds within the ranges studied. An increase in germination time at 25ºC decreased the concentration of Bowman?Birk inhibitor, lectin and lipoxygenase. After 63 h of germination, a temperature increase from 20ºC to 30ºC resulted in a decrease of lipoxygenase activity by 22.5%. Optimal increases in the concentrations of isoflavone aglycones (daidzein and genistein) and saponin glycosides were observed with a 63 h germination time at 30ºC. Both germination time and temperature had an influence on the composition and concentration of bioactive compounds in germinated soybean flour. Equations determined can be used to predict concentrations of bioactive compounds in germinated soybeans in relation to climate changes and thus optimize their potential use in human health and nutrition.Made available in DSpace on 2018-05-10T01:01:00Z (GMT). No. of bitstreams: 1 EffectoftimeandtemperatureonbioactivecompoundsingerminatedBraziliansoybeancultivarBRS258.pdf: 3035 bytes, checksum: 2aca09a153ac837a4ef839dd29c40b7b (MD5) Previous issue date: 2010-02-03bitstream/item/125031/1/Effect-of-time-and-temperature-on-bioactive-compounds-in-germinated-Brazilian-soybean-cultivar-BRS-258.pd