Lignin recovery from a mixture of SIX lignocellulosic biomasses within a biorefinery scheme based on a sequential process of autohydrolysis and organosolv

•A complex mixture of six lignocellulosic biomasses was pretreated for the first time.•High pure lignin was isolated from the sequential autohydrolysis and organosolv.•The temperature had more effect on lignin yield than ethanol concentration and time.•Lignin structure was almost unchanged by the organosolv process.•Lignin showed antioxidant activity as high as the commercial antioxidant BHT.