2.6. Evaluation of thermal stability of Senjed peel aqueous extracts
Thermal stability of Senjed peel aqueous extracts was evaluated by heating at 185 ℃ in a vacuum oven (Memmert GmbH, Schwabach, Germany) for 80 min by 10 min intervals in separate crucibles. After each interval, a crucible was removed from the oven, cooled to room temperature and stored at 4 ℃ before antioxidant activity evaluation in DDPH assay system following the above-cited method.