Ultrasonication pretreatment at different percent power and
irradiation time had exhibited interesting results. Generally, yield
of sugar from dilute acid hydrolysis of ultrasonicated samples
(Sample 7x–11x) was comparatively higher than the raw sample,
which is in good agreement with similar works dedicated in investigating
effect of this pretreatment on hydrolysis performance of
biomass (Sun and Tomkinson, 2002; Yu et al., 2009). The highest
amount of sugar from hydrolysis of ultrasonicated sample,
132.96 mg sugar/g dry matter, was obtained from Sample 11B
(ultrasonicated at 100% power for 20 min).