Theonion (AlliumcepaL.) processing industry generates substantial inedible wastes which constitute an environmental risk. Nevertheless, these wastes could be valorized to obtain bioactive compounds with antioxidant, anticancer and antidiabetic properties [1]. For this purpose, subcritical water extraction (SWE) offers an eco-friendly approach by using pressurized hot water (100-374ºC) with unique properties as solvent
