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<p>The improper disposal of cow urine (CU) cause significant environmental, social and health issues. The present study was aimed to develop a sustainable fermentation process using a fermentation medium having cellulosic sugars and cow urine as carbon and nitrogen source, respectively, for the production of β-carotenoids and ethanol. To achieve this, the concentration of CU was standardized along with other media components for the production carotenoids and ethanol using <i>Rhodotorula glutinis</i> CCT-2186 and <i>Saccharomyces cerevisiae</i> IR-2, respectively. Maximum recovery of total carotenoids (155.04&#xa0;mg/L) and ethanol (54.32&#xa0;g/L) were observed in a media supplemented with 1 and 0.5% (v/v) CU, respectively. This process allows for a partial reduction in the supplementation of commonly used nitrogen sources (such as yeast extract, peptone, ammonium sulfate, etc.), which represent a significant part of the industrial production cost. This yeast fermentation method in a medium supplemented with CU is a pioneering one, with no previous reports in the scientific literature.</p>

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Cow urine is a potent organic nitrogen source for microbial production of ethanol and β-carotene: an experimental proof

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月31日

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  • Erick Díaz Ruiz,
  • Richa Arora,
  • Júlio César dos Santos,
  • Silvio Silvério da Silva,
  • Anuj Kumar Chandel

摘要

The improper disposal of cow urine (CU) cause significant environmental, social and health issues. The present study was aimed to develop a sustainable fermentation process using a fermentation medium having cellulosic sugars and cow urine as carbon and nitrogen source, respectively, for the production of β-carotenoids and ethanol. To achieve this, the concentration of CU was standardized along with other media components for the production carotenoids and ethanol using Rhodotorula glutinis CCT-2186 and Saccharomyces cerevisiae IR-2, respectively. Maximum recovery of total carotenoids (155.04 mg/L) and ethanol (54.32 g/L) were observed in a media supplemented with 1 and 0.5% (v/v) CU, respectively. This process allows for a partial reduction in the supplementation of commonly used nitrogen sources (such as yeast extract, peptone, ammonium sulfate, etc.), which represent a significant part of the industrial production cost. This yeast fermentation method in a medium supplemented with CU is a pioneering one, with no previous reports in the scientific literature.