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Acidophilic heterotrophs: basic aspects and technological applications.

Ernesto González1,2, Fernando Vera2, Felipe Scott3

  • 1Department of Chemical and Materials Engineering, Faculty of Chemistry, Universidad Complutense de Madrid, Madrid, Spain.

Frontiers in Microbiology
|June 3, 2024
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Summary
This summary is machine-generated.

Acid-loving microorganisms (acidophiles) can consume organic matter and reduce iron, offering potential in biomining and robust fermentation. Their unique traits enable applications in bioremediation and microbial electrochemical systems.

Keywords:
acidiphiliumacidophilefermentationheterotrophmixotrophorganic matter

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Area of Science:

  • Microbiology
  • Environmental Science
  • Biotechnology

Background:

  • Acidophiles are microorganisms thriving in acidic conditions, often associated with autotrophic metabolism.
  • However, numerous acidophiles capable of heterotrophic growth utilizing organic matter have been identified.
  • Many acidophiles exhibit iron-reducing capabilities, relevant for industrial applications.

Purpose of the Study:

  • To provide an updated overview of acidophile basic characteristics and technological applications.
  • To explore their potential in biomining, bioremediation, and fermentation processes.
  • To discuss their use in microbial electrochemical systems and as a source of extremozymes.

Main Methods:

  • Extensive literature review of scientific publications on acidophiles.
  • Analysis of studies focusing on acidophile metabolism, particularly heterotrophic and iron-reducing capabilities.
  • Compilation of data on current and potential technological applications.

Main Results:

  • Over 80 heterotrophic acidophiles have been isolated from diverse environments.
  • Acidophiles' iron reduction ability can enhance mining processes, especially when oxidative bioleaching is inefficient.
  • Their growth in acidic media reduces contamination risk, making them suitable for robust fermentation.

Conclusions:

  • Acidophiles possess diverse metabolic capabilities beyond autotrophy, including heterotrophy and iron reduction.
  • These microorganisms offer significant potential for biotechnological applications in biomining, bioremediation, and biopolymer production.
  • Further research into acidophiles and their extremozymes could lead to innovative industrial processes.