Mangosteen hulls were collected from a private orchard in Sun-gai Gadut, Negeri Sembilan, Malaysia (2◦43North, 101◦53East) inmid December 2011 and dried under a fan at room temperature fol-lowing the procedure of Cheok et al. (2012a). One kilogram of driedhull was crushed into powder of particle size lower than 4 mm usinga dry crusher (SM100 Comfort, Retsch, Germany). The crushed hullwas stored in a freezer (ACF15F, Acson, Malaysia) at −10◦C untilthe extraction process.