Two methods have been studied by the scientific research units, typically investigations "stevioside extract from tree sweet grass" of Faculty of natural sciences of the University of can tho and the process of "production process of sugar from the sweet grass tree" of Faculty of mechanical engineering-technology in agriculture and forestry, Hue University In addition, foreign documents also have studies on stevioside extract methods from sweet grass such as: V enkata Sai Prakash Chaturvedula, Mani Upreti and Indra Prakash. 2011, "Diterpene Glycosides from Stevia rebaudiana", Molecules. Vol. 16, no. 5 (3552-3562)
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