Abstract
Ethanol is the main biofuel produced by fermentation route and the search for new feedstocks to produce fuel ethanol is still a great challenge. This work aims to compare the ethanol production from a new irrigated rice cultivar BRS AG to the conventional cultivar BRS PAMPA applied in Brazil. Six different commercial strains of Saccharomyces cerevisiae (BG-1, CAT-1, FT-858, JP-1, PE-2, and SA-1) were applied in fermentation reactions. Fermentations performed with BRS PAMPA rice revealed that the highest yields were achieved with strain SA-1, corresponding to 93.0% of the theoretical maximum and final ethanol concentration of 58.92 g L−1, and with CAT-1, a yield of 92.7% and final ethanol concentration of 58.93 g L−1. For the fermentations with BRS AG rice, the highest yields were obtained with strain FT-858, exhibiting a 89.6% yield and final ethanol concentration of 62.45 g L−1, and with CAT-1, 87.9% yield and final ethanol concentration of 61.25 g L−1 were achieved. The most appropriate microorganism for ethanol production using BRS PAMPA rice and BRS AG rice was CAT-1. Comparatively, the ethanol yield and productivity using BRS AG were higher than those observed for BRS PAMPA for all strains, except for PE-2 and SA-1 that led to very similar results. The experimental results showed that the giant rice BRS AG is an excellent feedstock for fuel ethanol production in lowland fields.
Highlights
The search for renewable and clean alternative fuels that can supply the global energy demands has increased in recent years
A study of the reaction parameters during the enzymatic hydrolysis contained in the BRS PAMPA rice was carried out
The best reaction condition obtained was used in the hydrolysis reactions of BRS PAMPA rice and BRB AG rice for fermentation reactions with the S. cerevisiae strain
Summary
The search for renewable and clean alternative fuels that can supply the global energy demands has increased in recent years. In addition to environmental problems, fossil fuels may d eplete[1] In this way, ethanol has been considered as the most viable and potential alternative to reduce the use of fossil resources and its production has been increasing over the y ears[3]. The industrial production of ethanol consists of fermentation processes, using microorganisms to convert sugars into alcohol. The United States of America and Brazil are the major producers of bioethanol. They used food crops as feedstock via a biochemical r oute[4]. The United States of America uses starch of corn as a source of Scientific Reports | (2022) 12:2122. In 2019, they produced about 15.8 and 8.6 billion gallons of ethanol, which contributes about 89% of the world’s total ethanol p roduction[4]
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