Bioethanol from Sweet Potato Clones at Pruning Age and Yeast Concentrations

The use of bioethanol can save premium usage in addition, bioethanol can reduce greenhouse gas emissions by up to 80% from its combustion results so as to decomp additionally greenhouse effects. Raw materials for producing bioethanol from that materials containing glucose, starch, cellulose. The purpose of the study was to find out of tape yeast concentrations on the bioethanol fermentation process of 8 sweet potato clones. The interaction between clone variation and yeast concentration has a noticeable effect on the results of the analysis of starch levels after the fermentation process. Starch levels showed a very significant decrease in the starch levels of fresh raw materials before the fermentation process. The results showed that the interaction between clone variation and yeast concentration had a noticeable effect on the results of the analysis of alcohol levels produced. The highest alcohol content is produced from Sari clones (150 DAP) with a yeast concentration of 15% with a content of 6.59%. The variation of clones and the concentration of yeast interacts manifestly with the results of the analysis of the total sugar content after the fermentation process. The total sugar measured is the total amount of sugar left after the fermentation process. Results showed a significant decrease in total sugar fermentation process by tape yeast showed the absence of starch hydrolysis and a total overhaul of the resulting sugar into alcohol. The concentration of yeast has no effect on the change of pH in the fermentation process, the pH at the end of the fermentation process is in the range of 4.1-6.3.