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More efficient bioethanol production might be possible using persimmon tannin to help yeast thrive

More efficient bioethanol production might be possible using persimmon tannin to help yeast thrive
This powder was used to create the supernatant that showed some beneficial antioxidative properties that help yeast grow. Credit: Osaka Metropolitan University

While ethanol in alcoholic beverages impairs drinkers' motor functions, it is that same substance that can power motor vehicles in a cleaner, more sustainable manner. What is necessary for the production of ethanol is yeast, but ethanol is among the environmental factors that add stress to yeasts, hindering their growth. To promote efficient bioethanol production, scientists have been searching for substances that can help yeasts better withstand ethanol, but few effective ones have been found.

An Osaka Metropolitan University research team, including graduate student Ilhamzah and Professor Ken-ichi Fujita of the Graduate School of Science and Professor Akira Ogita of the Research Center for Urban Health and Sports, has found that tannin from persimmons improves the growth of the yeast strain Saccharomyces cerevisiae in the presence of ethanol.

The findings were published in the Journal of the Science of Food and Agriculture.

"In this study, yeast cultures grown in a medium containing ethanol and persimmon tannin showed an 8.9-fold increase in cell number compared to cultures grown in an ethanol medium without persimmon tannin," stated Professor Fujita.

The researchers explored persimmon tannin because it is known for its antioxidative properties.

"Persimmon tannin reduced ethanol-induced ," Fujita added. "However, persimmon tannin did not prevent ethanol-induced cell membrane damage. This indicates the potential of persimmon tannin as a protective agent to enhance the yeast's tolerance to ethanol stress by limiting oxidative damage, rather than limiting damage to the yeast's cell membranes."

More information: Ilhamzah et al, Persimmon tannin promotes the growth of Saccharomyces cerevisiae under ethanol stress, Journal of the Science of Food and Agriculture (2024). DOI: 10.1002/jsfa.13439

Citation: More efficient bioethanol production might be possible using persimmon tannin to help yeast thrive (2024, May 16) retrieved 14 July 2024 from https://phys.org/news/2024-05-efficient-bioethanol-production-persimmon-tannin.html
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