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<p>The use of fossil fuels contributes significantly to environmental pollution and global warming. Factors such as rising energy demand, depletion of fossil fuel reserves, population growth, and anticipated increases in fuel prices are accelerating the global shift toward cleaner energy sources. Among these alternatives, the production of bioethanol from marine microorganisms has garnered attention for its economic feasibility and low environmental impact.This study aimed to isolate and identify yeast strains from the water and sediments of the Bushehr coast capable of bioethanol production. Additionally, optimal production conditions for the most efficient strain were investigated. A total of 18 yeast strains were isolated and identified through morphological and molecular analyses, revealing that the strains belonged to the genera <i>Pichia</i> and <i>Candida</i>. After assessing the amount of ethanol produced during the fermentation process, the following strains were selected as the top bioethanol producing strains were identified as:<i> Pichia</i> sp. isolate BK10,<i> Pichia kudriavzevii</i> isolate BK40, <i>Pichia kudriavzevii</i> isolate BK50, <i>Pichia fermentans</i> isolate MK20, and <i>Candida parapsilosis</i> isolate BK30. Bioethanol production was conducted using a microfermentation method with various carbon sources, including glucose, fructose, lactose, and sucrose. The highest ethanol yield of 100.28g/L was obtained with glucose as the carbon source. Furthermore, UV-induced mutagenesis of the superior strain increased bioethanol production to 119.92g/L. These marine yeast strains demonstrate significant potential for industrial applications, particularly in small-scale bioreactor-based alcohol production.</p>

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The potential of bioethanol production in marine yeasts and investigation of the optimal conditions of production in the selected isolates

  • 期刊论文

  • 发表日期：

    2025年2月20日

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  • Banafsheh Khajeh,
  • Hossein Zolgharnein,
  • Isaac Zamani,
  • Kamal Ghanemi

摘要

The use of fossil fuels contributes significantly to environmental pollution and global warming. Factors such as rising energy demand, depletion of fossil fuel reserves, population growth, and anticipated increases in fuel prices are accelerating the global shift toward cleaner energy sources. Among these alternatives, the production of bioethanol from marine microorganisms has garnered attention for its economic feasibility and low environmental impact.This study aimed to isolate and identify yeast strains from the water and sediments of the Bushehr coast capable of bioethanol production. Additionally, optimal production conditions for the most efficient strain were investigated. A total of 18 yeast strains were isolated and identified through morphological and molecular analyses, revealing that the strains belonged to the genera Pichia and Candida. After assessing the amount of ethanol produced during the fermentation process, the following strains were selected as the top bioethanol producing strains were identified as: Pichia sp. isolate BK10, Pichia kudriavzevii isolate BK40, Pichia kudriavzevii isolate BK50, Pichia fermentans isolate MK20, and Candida parapsilosis isolate BK30. Bioethanol production was conducted using a microfermentation method with various carbon sources, including glucose, fructose, lactose, and sucrose. The highest ethanol yield of 100.28g/L was obtained with glucose as the carbon source. Furthermore, UV-induced mutagenesis of the superior strain increased bioethanol production to 119.92g/L. These marine yeast strains demonstrate significant potential for industrial applications, particularly in small-scale bioreactor-based alcohol production.