Ultrasonic-assisted extraction of polyphenol from the seeds of Allium senescens L. and its antioxidative role in Harbin dry sausage.

The ultrasonic-assisted extraction of total polyphenol from Allium senescens L. (ASL) seeds was conducted, and the antioxidant efficacy of ASL seed extract (ASLSE) was assessed in Harbin dry sausages. ASLSE extracted with 1:30 g/mL water at 150 W for 15 min had the highest antioxidant capacities (P < 0.05). Subsequently, different addition levels (0, 2, 4, 6 and 8 g/kg) of freeze-dried ASLSE were applied in dry sausages during a twelve-day fermentation, and BHT treatment was the positive control. The lower pH values and carbonyl contents were detected in the treatments with 6 and 8 g/kg ASLSE than those in the other treatments at 12 d (P < 0.05). However, there was no difference in the water activity, lipid oxidation and color among the treatments with 6 and 8 g/kg ASLSE and 0.2 g/kg BHT (P > 0.05) at 12 d. These results indicated that 6 g/kg ASLSE could be effective in inhibiting lipid and protein oxidation and reducing color deterioration of dry sausages.