Optimization of microwave-assisted extraction of phenolics from potato and its downstream waste using orthogonal array design

► Used orthogonal array design matrix to optimize experimental conditions. ► An optimized MAE method for antioxidants in downstream wastes of potato processing. ► Identification and analysis of phenolics of the potato processing downstream wastes. ► Supernatant of the waste had the highest TPC and antioxidant activities. ► The predominant phenolic compound and contributor to antioxidant activity was chlorogenic acid.