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This work aimed to optimize the extraction technology of antioxidant substances from Daldinia concentrica by orthogonal experiments. Using ultrasonic assisted extraction process, the effects of ethanol concentration, solid-liquid ratio, and extraction time on scavenging rate of DPPH radical were inspected. According to the result of single-factor experiment and the orthogonal design method, a L16(4 3 ) orthogonal table was used to study the ultrasonic extraction technology of antioxidant activedoi:10.14456/sjst-psu.2020.131 fatcat:7ly5or4zpjco5ofe2fgztzq7g4