| dc.description.abstract | Sago is a genus of palm that can be utilized to produce fermentable sugars as
substrate for bioethanol. Sago pith is a heterogeneous substrate consists of starch and fiber.
Acid hydrolysis by microwave heating radiation can break down starch and fibers together in a
very short time, so it is considered to be very efficient process. The use of microwave energy
(as power level) and variation of heating time can produce fermentable sugar with certain
characteristics. This study included the preparation and analysis of sago pith flour; process of
acid hydrolysis (0.3 M and 0.5 M H2SO4) using two steps microwave heating, first with power
level 30% (1, 2 and 3 min) and second with power level 70% (3 min); and ethanol production.
The conventional treatment (autoclaving at 121C for 15 min) was carried for the comparison.
The highest fermentable sugar (105.7 g/l) was resulted from microwave heating with power
level 30% for 2 min followed by the power level 70% for 3 min. This hydrolyzate then used
as substrate for bioethanol fermentation and partially neutralized (pH 3, 4, 5) by using yeast
Issatchenkia orientalis, and the highest ethanol (2.8 g/l) was produced in pH 5. | en_US |
