Fig. 2 shows the sugar yield from hydrolysis of water hyacinth
samples ultrasonicated at different percent power for irradiation
period of 10, 20 and 30 min. The sugar production from hydrolysis
of ultrasonicated samples was found to be proportional to the
intensification of ultrasonicator power used in the pretreatment
process. Similar trend was observed in hydrolysis of ultrasonicated
corncobs and palm oil empty fruit bunch (Wang and Zhang, 2006;
Yunus et al., 2010).