Extraction of Antioxidant Effective Components from Black Wheat Bran and Evaluation of its Antioxidant Capacity

Black wheat bran is by-products of the black wheat processing， which is rich in many physiological active substances， including anthocyanins， phenolic acids and dietary fiber. In this study， the antioxidant activity of black wheat bran was extracted with different solvents and its antioxidant capacity was evaluated.The results showed that the dry matter yield of 75% ethanol extract was the highest， which was 10.72%. The content of total phenol extracted by 50% ethanol extract was the highest， which was 2.9 mg/ 100 mL. The scavenging power of DPPH was the strongest in 50% ethanol extract， and the antioxidant extraction capacity of DPPH was the strongest in 75% ethanol extract. 75% acetone extract had the strongest scavenging effect on ABTS， and 75% methanol extract had the strongest antioxidant extraction effect on ABTS. Therefore， the antioxidant capacities of different solvent extracts are different， and the comprehensive comparison shows that 50% ethanol is more suitable for the extraction of antioxidant active components from black wheat bran.