PRODUCTION OF ETHANOL FROM RICE USING YEAST (SACCHAROMYCES CEREVISIAE)
Abstract
ABSTRACT
This study investigated the production of ethanol from rice using Saccharomyces cerevisiae, chosen for its high carbohydrate content which supports bioethanol generation. Proximate analysis showed 40% carbohydrate, confirming rice as a suitable carbon source for fermentation. Microscopic examination identified typical budding yeast cells, validating S. cerevisiae as the fermenting organism. Fermentation carried out at varying substrate concentrations showed the highest ethanol yield at 10 g. At this level, commercial yeast produced 30 ml while isolated yeast produced 29 ml, with peak alcohol contents of 96.4% and 94.7%, respectively. Yield decreased with increasing substrate concentration, indicating reduced efficiency at higher loads. Findings showed commercial yeast performed slightly better in stability and ethanol output. The study concludes that rice is an effective and low-cost substrate and that S. cerevisiae remains an efficient fermenter for ethanol production. It is recommended that commercial yeast be used for large-scale production, optimum fermentation conditions be maintained, and further research explore the economic viability of rice-based bioethanol systems
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