| Using four Qinghai flaxseeds and three flaxseeds from Shanxi, Inner Mongolia and Gansu as raw materials, total phenol were extracted by ultrasound-assisted extraction, the total phenol contents were determined by Folin method, and the antioxidant activity of total phenol was evaluated by DPPH free radical scavenging test. The results showed that the optimal process for ultrasound-assisted extraction of total phenol from flaxseeds was obtained as follows: solid-liquid ratio 1∶ 17, ultrasonic temperature 40 ℃, and ultrasonic time 15 min. Under these conditions, the total phenol content was 30.21 mg/g. The total phenol contents in the flaxseeds from Qinghai Guide, Huzhu, Sanhe and Minhe were 23.16-28.70 mg/g, and the DPPH free radical scavenging rates were 42.62%-51.06%, however, the total phenol contents of flaxseeds from Shanxi, Inner Mongolia and Gansu were 19.97-22.38 mg/g, and the DPPH free radical scavenging rates were 41.84%-42.43%, indicating that the total phenol content and antioxidant capacity in Qinghai flaxseed had certain advantages and had a good application prospect. |
