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The current work aimed to maximize the yield of total phenolic content (TPC) and associated antioxidant activity of plum leaf extract. The feasibility of using the optimal extract as a natural antioxidant for retarding the oxidation process in sunflower oil using rancimat method was also investigated. One-factor-at-a-time (OFAT) method and 32 full factorial design were implemented in sequence to optimize the studied factors (extraction time ET (10–60 min) and ethanol percentage EtOH% (0%–75%)). DPPH scavenging ability of the obtained extracts were positively (r ≥ 0.7493) and significantly (p .05) differed. Practical applications Plum (Prunus domestica L.) leaves are characterized by a high content of phenolic compounds which varied between 66.50 to 143.7 mg GAE/g powder. Plum leaf extracts exhibited high scavenging activity against DPPH radicals. The protection factor of the freeze-dried optimal leaves extract was insignificantly differed than that of BHT at the concentration of 200 ppm. These findings indicate that plum leaves extract could efficiently retard the oxidation process of edible oils; and consequently, improve their quality and extend their shelf life.
Elsayed et al. (Tue,) studied this question.