Abstract:
The use of fuel oil (BBM) from fossil fuels is not increasing in line with the
decreasing oil production annually. Thus it takes new and renewable energy
sources that can meet the energy needs such as bioethanol from sorghum starch.
Sorghum starch content ranged from 56-73%, with an average of 69.5% and
amounted to 73.8% carbohydrates. This study aims to convert sorghum starch
into bioethanol through likuifikasi, simultaneous saccharification and
fermentation (SFS) and determine the influence of temperature variations on
levels of bioethanol likuifikasi. This study varying the temperature of 75oC
likuifikasi; 85 oC, 95 oC and time-taking process SFS ie 12, 24, 48 and 72 hours at
optimum pH 5 and enzymes mass of each 0.2 mL. Tests were conducted with
alkoholmeter and sugar analysis using visible light spectrophotometer. The
results showed that the highest sugar concentration obtained in the process of
using the enzyme amylase likuifikasi reached 13.95 g / ml at a temperature of
850C, whereas the highest ethanol concentration of 50 g / L at 24 hours SFS and
temperature 85oC.
