Abstract:
Generally, the cassava waste which mostly carbohydrate (66.22% dried) and fiber (15.23% dried) were used as feed. Because of high carbohydrate content, it could be used as raw material in glucose production. To hydrolyze cassava waste, it would be done by using acids or enzymes. Hydrolyzation of cassava waste by hydrochloric acid produced hydrolyzate with reducing sugar content 61.68 ±0.62% in 2.5 hours. This research aimed to study the hydrolyzation condition of cassava waste by using three enzymes with ultrafiltration application to enhance the efficiency. It was found that suitable condition for alpha-amylase and glucoamylase were pH 5.0 and temperature 50℃ and gave hydrolyzate with higher reducing sugar content than using each enzyme alone. The amount of alpha-amylase and glucoamylase per gram of cassava waste were 285.6 MWU and 0.21 DU, respectively. At this condition, Vmax was 0.133 mg of reducing sugar/ml.min and gave reducing sugar content in the hydrolyzate at 24.10%. The addition of cellulose 15.48 NCU/g of cassava waste gave hydrolyzate contained a reducing sugar content at 39.02% . The hydrolyzation of cassava waste by alpha-amyhlase and glucoamylase with the ultrafiltration application using, average pressure of 98 kPa, flow rate passed membrane surface at 130 ml/sec and filtration area 28.27 cm2, gave higher reducing sugar content than the non-filtrated. The hydrolyzation of cassava waste with combination of three enzymes, the ultrafiltration did not enhance the efficiency of enzymes. By calculation, filtration area for three enzymes need at least 0.256 cm2/ml of cassava waste solution, or 27 times of filtration area that used in this experiment to accomplish the enhancement.