The hulls of GM were cut into small pieces and dried in a hot air oven at 50 °C for 24 h. The dried samples were milled into powder by blender. Dried powder was separately macerated with 70% acetone at room temperature until the extraction was exhausted. Acetone extract was combined and filtered through a Whatman no. 1 filter paper under suction. The filtrate was concentrated on water bath and evaporates solvent in rotary evaporator to obtain the dry crude extracts.