Health Benefits, Antioxidant Activity, and Sensory Attributes of Selected Cold-Pressed Oils

Abstract

The consumption of cold-pressed oils (CPOs) has continuously increased due to their health-promoting compounds, such as polyunsaturated fatty acid (PUFA), tocopherols, sterols, and polyphenols. This study focused on the estimation and comparison of the physicochemical properties and sensory quality of six CPOs: linseed oil (CPLO), pumpkin oil (CPPO), milk thistle oil (CPMTO), rapeseed oil (CPRO), camelina oil (CPCO), and sunflower oil (CPSO), which are the most popular in the Polish market. These oils were analysed for their fatty acid composition (FAC), their tocopherol, sterol, polycyclic aromatic hydrocarbon (PAHs), water, and volatile matter (WVM) contents, as well as their antioxidant activity (AA) and oxidative stability parameters. Moreover, quantitative descriptive analysis (QDA) was performed to obtain detailed information on the sensory profiles and quantitative data on the CPOs’ attributes that affected consumer acceptability and purchase intent. All of the analysed CPOs were rich in PUFA (27.94–68.42%). They were characterised by the different total amounts of health-beneficial compounds, such as tocopherols (TTC = 44.04–76.98 mg/100 g), sterols (TSC = 300–684 mg/100 g), and polyphenols (TPC = 2.93–8.32 mg GA/100 g). Additionally, their AA was determined using 2,2-diphenyl-1-picrylhydrazyl (DPPH), 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS), and ferric reducing antioxidant power (FRAP) methods, with results ranging between 185.36–396.63, 958.59–1638.58, and 61.93–119.21 µmol TE/100 g, respectively. However, the deterioration parameters of CPOs, such as peroxide values (PV = 0.24–4.61 meq O2/kg), p-anisidine values (pAnV = 0.39–4.77), acid values (AV = 0.31–2.82 mg KOH/g), and impurity amounts (Σ4PAHs = 1.16–8.76 μg/kg and WVM = 0.020–0.090%), did not exceed the level recommended by the Codex Alimentarius Commission. The obtained results indicated that all of the investigated CPOs are valuable sources of health-promoting bioactive compounds.

Physicochemical properties and fatty acid profile of oil extracted from black soldier fly larvae (Hermetia illucens)

“…To obtain natural oil products, the pressing method is based only on a mechanical process [54]. Therefore, the pressing method is a rich source of phytosterols, tocopherols, carotenoids, and polyphenols that are associated with antioxidant capacity [55,56]. According to previous studies, the pressing method has advantages with regard to the retention of active components to scavenge free radicals both in vivo and in vitro [57,58].…”

Trends in authentication of edible oils using vibrational spectroscopic techniques

“…These oils generally have relatively higher levels of bioactive compounds such as polyphenolic compounds, phytosterols and tocopherols contributing to their association with positive health benefits. 139 Cold pressed oils are defined as ‘those obtained, without altering the oil, by mechanical procedures only, e.g. expelling or pressing, without the application of heat.…”

The Effect of Extraction by Pressing at Different Temperatures on Sesame Oil Quality Characteristics

“…In recent years, consumer interest in virgin vegetable oils has increased worldwide, largely due to the growing evidence that these oils have beneficial nutritional and health effects [6]. One type of these oils are cold pressed oils [7].…”