Fig. 1B shows the results of pre-treatment 2 using a high speed homogenizer. It can be observed that a dosage of 20% WBY gave the highest reducing sugar yield after 10 min. While all other dosages reached their maximum values after 15 min. The maximum reducing sugar yield increased with the dosage of WBY with values of 9.83%, 11.22% and 16.17% for 5%, 10% and 15% respectively. Although the maximum yield from 20% WBY reached faster with a value of 13.26%, it was lower than that from 15% WBY. Similar trend was observed in pre-treatment 1 for the dosage of 20%.