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Camelina oil (Coil) contains 50-60 % of polyunsaturated fatty acids which are susceptible to oxidation. In this work, addition of phospholipids (0-20 mg/g) was assessed to improve the solubility of quercetin in Coil and enhance its oxidative stability. Results showed that the solubility of quercetin in Coil increased up to 7.7-fold by phospholipid addition. The solubility of quercetin in Coil was correlated to the phospholipid concentration and reached a maximum value of 1 298 g/g. The addition of phospholipid-quercetin formulations increased the Coil stability, measured at 60 °C, from 24 h up to 115 h. Coil saturated with only quercetin (168 g/g) did not significantly increase Coil stability, whereas phospholipids alone extended the oxidation lag time up to 40 h. This work successfully developed a solvent-free method for improving the solubility of quercetin in Coil and enhance its oxidative stability.

The objective was to evaluate the performance of four hydro-alcoholic solvents to simultaneously extract oil and more polar molecules as phenolics, among others, to produce complex extracts that eventually could self-emulsify after solvent removal. Walnut press-cake was selected as the sourcing material. Extractions were performed as a semi-continuous operation up to a solvent-to-solid ratio of 28, with a fractional collection of the effluent. Among the solvents, labelled by their alcohol content EtOH 58, EtOH 86, iPro 60 and iPro 90 for ethanol (EtOH) and isopropanol (iPro), iPro 90 allowed to reach an oil extraction efficiency of 97% while the recovery for the other solvents was in the range of 30–40%. For both alcohols, the increase of the solvent hydration negatively influenced the oil extraction but positively increased the recovery of phenolics that reached 17.6 mg GAE/gcake when EtOH 58 was used. Several fractions contained enough surface-active material and oil to self-assemble as emulsions. IPro 90 and EtOH 86 showed better performances in the sense that most extracts were able to emulsify, though extraction kinetics pointed out differences. The most hydrated solvents behaved equally, with extraction yields in the same range and a similar but limited emulsifying capacity of only few fractions.