Dried powder of young and mature fruit rinds of G. mangostana (each 25 g) was separately macerated with 95% ethanol (8×100 mL) at room temperature (25–28 °C) until the extraction was exhausted. Each ethanolic extract was combined and filtered through a Whatman no. 1 filter paper under suction. The filtrate was concentrated under reduced pressure at 50 °C using a rotary vacuum evaporator. The extraction of each sample was done in triplicate and the yield of crude ethanolic extract was reported as mean±SD.