Compositional analysis of oil palm fronds
Fig. 1 shows the overview of the NREL processes for the characterization of OPF biomass in this study. As shown in Fig. 1, water and ethanol extraction steps helped to remove a large variety of impurities from the biomass. Water extraction removed inorganic materials, non-structural sugars, soil and proteins [31] while ethanol extraction removed terpenoids, waxes, fat acids, phenolic substances and chlorophyll