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Updated: Jun 3, 2025

Author Spotlight: Advancing Anaerobic Microbiota Research Using a Novel Respirometry Protocol
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Brazilian Food Waste as a Substrate for Bioethanol Production.

Íthalo Barbosa Silva de Abreu1, Rayssa Karla Silva2, Joyce Gueiros Wanderley Siqueira1

  • 1Research Group on Biomass Energy, Department of Nuclear Energy, Federal University of Pernambuco, Recife 50740-545, PE, Brazil.

Foods (Basel, Switzerland)
|January 8, 2025
PubMed
Summary
This summary is machine-generated.

Food waste can be converted into fermentable sugars and bioethanol using acid or enzymatic hydrolysis. Acid hydrolysis proved more efficient, yielding higher bioethanol from raw food waste, offering a sustainable biofuel alternative.

Keywords:
acid digestionbiofuelsenzymesfood wastemunicipal solid waste

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Area of Science:

  • Biotechnology
  • Biochemistry
  • Environmental Science

Background:

  • Food waste (FW) is a significant environmental contaminant, releasing greenhouse gases and impacting soil and water bodies.
  • FW presents a valuable resource for biofuel and bioproduct generation, contributing to a circular bioeconomy.
  • Developing efficient methods for FW valorization is crucial for mitigating environmental issues and promoting sustainable resource management.

Purpose of the Study:

  • To investigate the conversion of food waste into fermentable sugars and bioethanol.
  • To compare the efficiency of acid and enzymatic hydrolysis for sugar production from food waste.
  • To optimize conditions for acid hydrolysis and evaluate bioethanol yield from different hydrolysates.

Main Methods:

  • Food waste underwent lipid removal as a pretreatment step.
  • Hydrolysis was performed using amylases (enzymatic) and sulfuric acid under varying conditions (time, concentration, solid load, temperature).
  • Bioethanol production was achieved through static submerged fermentation using *Saccharomyces cerevisiae* with hydrolysates as carbon sources.

Main Results:

  • The optimal conditions for acid hydrolysis yielded the highest concentration of reducing sugars (1.5% sulfuric acid, 15% solid load, 1 hour at 127 °C).
  • Acid hydrolysis demonstrated higher efficiency (76.26%) compared to enzymatic hydrolysis (72.7%).
  • The highest bioethanol yield (0.49 kg·kg glucose⁻¹) was obtained from the acid hydrolysate of raw food waste.

Conclusions:

  • The investigated processes are effective for bioethanol production from food waste.
  • Acid hydrolysis is a more efficient method for producing fermentable sugars from food waste compared to enzymatic hydrolysis.
  • This study offers sustainable alternatives for food waste management and low-cost biofuel production.