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Microbial Fermentation01:23

Microbial Fermentation

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Fermentation is a crucial anaerobic metabolic process that enables microbes to derive energy from sugar without relying on oxygen or an electron transport chain. This process is fundamental to various biological and industrial applications and is classified based on the metabolic products generated.Role of Pyruvate in FermentationPyruvate and its derivatives serve as key electron acceptors in fermentative pathways. The oxidation of NADH to regenerate NAD+ is essential for the continuation of...
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Microorganisms play a pivotal role in maintaining ecosystem balance by recycling essential elements such as carbon, nitrogen, and phosphorus, as well as supporting processes like bioremediation, wastewater treatment, and biofuel production.Microbes in Elemental CyclesIn the carbon cycle, microorganisms decompose organic matter, releasing carbon dioxide via aerobic respiration. This carbon dioxide is subsequently used by photosynthetic organisms to synthesize organic compounds, closing the...
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Microorganisms play a crucial role in agriculture and the food industry, contributing to soil fertility, crop protection, and food production. Their functions range from nitrogen fixation and biopesticide production to fermentation and food preservation, making them indispensable to sustainable farming and food safety.Role in AgricultureNitrogen-fixing bacteria, such as Rhizobium (symbiotic) and Azotobacter (free-living), convert atmospheric nitrogen into ammonia through biological nitrogen...
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Evaluation of Integrated Anaerobic Digestion and Hydrothermal Carbonization for Bioenergy Production
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Bioconversion of Crop Residues Using Alternative Fermentation-Based Approaches.

Alessandra Verardi1, Paola Sangiorgio1, Alessandro Blasi1

  • 1Italian National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA), Trisaia Research Centre, 75026 Rotondella, Matera, Italy.

Frontiers in Bioscience (Elite Edition)
|September 24, 2023
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Summary

Agroindustrial residues can be converted into valuable products using microbial fermentation, supporting a circular bioeconomy. This review compares fermentation strategies for efficient crop residue valorization and discusses future challenges.

Keywords:
bioconversioncrop residuesfermentationsustainabilityvalue added products

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Area of Science:

  • Agricultural Science
  • Biotechnology
  • Environmental Science

Background:

  • Globally, millions of tons of crop residues are generated, often disposed of as waste, causing pollution and soil degradation.
  • Ineffective management of agroindustrial residues leads to environmental issues and loss of valuable resources.

Purpose of the Study:

  • To review crop residue biomass valorization through microbial fermentation.
  • To analyze raw material properties, risks of improper management, and microbial fermentation strategies.
  • To provide a comprehensive overview of crop residue bioconversion into valuable products.

Main Methods:

  • Literature review of crop residue valorization and microbial fermentation.
  • Analysis of different fermentation strategies: Separate Saccharification and Fermentation (SHF), Simultaneous Saccharification and Fermentation (SSF), Simultaneous Saccharification and Co-fermentation (SSCF), and Consolidated Bioprocessing (CBP).
  • Evaluation of raw material properties, environmental risks, microbial cultures, and industrial product examples.

Main Results:

  • Microbial fermentation efficiently converts nutrient-rich crop residues into products like single-cell proteins, bioalcohols, and fine chemicals.
  • Alternative strategies (SSF, SSCF, CBP) offer advantages over SHF by reducing process time, costs, and contamination.
  • Each fermentation strategy presents unique strengths and weaknesses requiring careful consideration for large-scale implementation.

Conclusions:

  • Crop residue valorization via microbial fermentation is key to a circular bioeconomy.
  • Selection of the optimal fermentation strategy depends on raw material properties, costs, sustainability, and ROI.
  • Further research is needed to address challenges and optimize future outlooks for residue bioconversion.