Noel Francis G. Belleza, Fiel Christian P. Mamon, Roberto G. Tubongbanua Jr. (February 2008)
Philippine Science High School Western Visayas Campus – Department of Science and Technology (DOST-PSHS WVC), Brgy. Bito-on, Jaro, Iloilo City 5000, Philippines
ABSTRACT
Ethanol is a clean-burning, high-octane fuel that is produced from renewable sources. These sources are divided into sugar-containing materials, starchy materials and cellulosic materials. In this study, different varieties of ube namely ube (Dioscorea alata), kayos (Dioscorea hispida), baong (Dioscorea sp.) and banayan (Dioscorea luzonensis) were used as sources of starch for processing into ethanol.
The different varieties of ube underwent starch extraction, starch hydrolysis, fermentation and distillation. German thermohydrometer was used in order to determine the ethyl alcohol content.
Results of the study showed that the ethyl alcohol content of extracts from different varieties of ube ranged from 3.90% to 4.15% with banayan yielding the least amount of ethyl alcohol and ube with the greatest amount of ethyl alcohol content.
One-way ANOVA showed a significance level of 0.257. This means that there is no significant difference between the ethyl alcohol content of the different varieties of ube.