Abstract:
Bioethanol can be produced by fermentation of materials containing starch, glucose and cellulose fibers. This
research tried to produce bioethanol from pineapple reject which is material containing glucose. The purpose of
this research was to determine the influence 0/ glucose concentration on the acquisition of ethanol and to obtain
the optimum glucose concemration for the production of bioethanol from pineapple reject raw materials.
Bioethanol production consists of several stages, namely preparation of raw materials; fermentation and
purification products. Variahles for the research is the concentration of glucose: 13%, 14%, i5%, 16% and 17%
by fermentation time l2. 14, 36, 48, 60, 72, 84, 96, J08, and J20 hours. Anaerobic fermentation process tokes
place at pH 4.5 by using Saccharomyces cerevisiae which will outline the glucose into ethanol Added nutrients
are urea and NPK respectively 0.5% and 0.06% of the volume of fermentation medium. The FeSUitsshowed that
the highest ethanol content of 17% and the highest yield of 11.33% is obtained at a concentration of J6%
gluoose with 7.34 gIL cell dry within 84 hours of fermentation.
