Preventing oxidation of canola and sunflower oils by addition of pomegranate seed oil

Abstract

The study was designed to explore the antioxidative effect of pomegranate seed oil (PSO) at different concentrations (5 and 7%) against oxidation of plant-based oils (canola oil and sunfl ower oil) during storage (60 days) as compared to artifi cial antioxidant butylated hydroxyanisole (BHA, 200 ppm). Rancimat and Schaal oven analysis were employed for the assessment of potential consequences of PSO against oxidation in plant based oils. The variation in total phenolic contents (TPC), antioxidant activity, peroxide value (POV), and tocopherol contents during storage were evaluated by Schaal oven test at 62 °C. The substantially (P≤0.05) higher induction period (IP) values were observed for PSO blended oil samples as compared to blank oil samples. The addition of PSO in plant-based oils improved the oxidative stability by enhancing the antioxidant potential and TPC, decreasing POV, and slowing down the degradation of tocopherol contents during storage. The fi ndings of the present study suggest that PSO might be used as an alternative potential antioxidant to synthetic antioxidants.

Blending of Sunflower Oil with Pomegranate Seed Oil from Blanched Seeds: Impact on Functionality, Oxidative Stability, and Antioxidant Properties

“…From Figure 3b, it is apparent that the DPPH radical scavenging capacity of SO decreased at a faster rate than that of SO:PSO and SO:BPSO. The finding concurs with results from previous studies [26]. The reaction rate constants for the depletion of DPPH radical scavenging capacity in SO, SO:PSO, and SO:BPSO were 0.182, 0.111, and 0.119 mmol Trolox (n−1) •day −1 , respectively.…”

“…The levels of α and δ-tocopherols in this study were lower, compared to literature, indicating losses during the GC-MS analysis. Lower levels of tocopherols in both SO (δ-tocopherols: 12.4 µg/g) and SO:PSO blend (δ-tocopherols: 13.2 µg/g) have been reported in similar studies [26]. The extraction efficiency of tocopherols may depend on the size, polarity of the tocopherols, and whether they exist as free or complexed molecules in the seed matrix [3].…”

Enrichment of Sunflower Oil with Ultrasound-Assisted Extracted Bioactive Compounds from Crithmum maritimum L.

“…Again, the RSA of the supplemented oil was 11 and 7-fold the values observed for the original oil, at the beginning and at the end of the accelerated oxidation test, respectively. Similarly, Siraj et al [39] studied the oxidative stability of canola and sunflower oil, supplemented with pomegranate seed oil, at 62 • C for 60 days and observed that the radical scavenging activity of the samples decreased during storage time. In the beginning of the experiment (day 0), the supplemented sunflower oil sample had an antioxidant activity of 52.71 ± 0.17 mg Trolox/kg, which decreased with the storage time and reached 20.02 ± 2.14 mg Trolox/kg after 12 days at 60 • C (62% reduction) (Figure 7).…”

Evaluation of three spectroscopic techniques in determination of adulteration of cold pressed pomegranate seed oils

“…There are various reports in the literature showing the high phenolic and carotenoid contents of PSO [3,8,9]. Moreover, PSOs have been proposed as a more effective alternative to synthetic antioxidants to protect plant-based oils against oxidation [24].…”