The of samples
were first prepared for compositional analysis based on NREL
procedure TP-510-42620 [27], the extractables were analyzed
based on NREL procedure TP-510-42619 [28], the determination
of the total solids content in the biomass was based on NREL
procedure TP-510-42621 [29], and the structural analysis of carbohydrates
and lignin was performed based on NREL procedure TP-
510-42618 [30].