Simultaneous Extraction of Bioactive Compounds from Olea europaea L. Leaves and Healthy Seed Oils Using Pressurized Propane

Abstract

Olive leaves (OL) are products of olive cultivation with a high commercial value because they contain valuable bioactive compounds. Chia and sesame seeds have a high functional value because of their attractive nutritional properties. When combined in the extraction process, the two products constitute a product of high quality. The use of pressurized propane in vegetable oil extraction is advantageous because it provides solvent-free oil. This study aimed to combine two high-quality products to obtain oils with a unique combination of attractive nutritional properties and high levels of bioactive compounds. The mass percentage yields of the OL extracts with chia and sesame oils were 23.4% and 24.8%, respectively. The fatty acid profiles of the pure oils and their respective OL-enriched oils were similar. There was an aggregation of the 35% and 32% (v/v) bioactive OL compounds in chia and sesame oils, respectively. OL oils exhibited superior antioxidant capacities. The induction times of the OL extracts with the sesame and chia oils increased by 73% and 4.4%, respectively. Incorporating OL active compounds in healthy edible vegetable oils using propane as a solvent promotes the reduction of lipid oxidation, improves the lipid profiles and health indices of the oils, and forms a product with attractive nutritional characteristics.

Quality improvement of oil extracted from flaxseeds (Linum usitatissimum L.) incorporated with olive leaves by cold press

“…These results are in agreement with the previously published data. It has been reported that simultaneous oil extraction from sunflower with olive leaves using solvents could increase the bioactive components of extracted oils (Jaski et al., 2022 , 2023 ). Also, oil extracted from pomegranate seeds with green tea leaves by cold press had higher total phenolic compounds (Dezashibi et al., 2022 ).…”

“…However, using olive leaves in the oil extraction could increase the induction period comparable with the rapeseed and soybean oils. There have been reports on the effect of olive leaves on the improvement of induction period of sunflower and sesame oils, which were extracted via simultaneous extraction by pressurized propane (Jaski et al, 2022(Jaski et al, , 2023. There are also reports that using rosemary and green tea incorporated with oilseeds while oil extraction by cold press could increase the oxidative stability of extracted oils (Ashrafi et al, 2023;Mikołajczak et al, 2021).…”

“…However, they need extraction and also, in many cases, concentration, drying steps, and limitation of solubility of extracts in vegetable oils (Dauber et al, 2022). Olive leaves have been used with sunflower, chia, and sesame seeds in the simultaneous extraction of oil by pressurized propane method, which indicated that this method can reduce lipid oxidation and improve the bioactive components and nutritional characteristics of the extracted oils (Jaski et al, 2022(Jaski et al, , 2023.…”

Olive Oil Waste as a Source of Functional Food Ingredients: Assessing Polyphenolic Content and Antioxidant Activity in Olive Leaves

“…Currently, there is a concern about accomplishing greener procedures when extracting compounds of interest from agro-food matrices such as olives leaves, by employing greener extraction solvents such as water, 70:30 (v/v) water/ethanol solutions or deep eutectic solvents [37]. For olive leaves, in particular, recent works have proposed pressurized propane [38] or isopropanol water [39] for the extraction of bioactive compounds. The first approach is not adequate for polyphenols as they do not have a low boiling point.…”