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Olive pomace valorization by Aspergillus species: lipase production using solid-state fermentation.

Felisbela Oliveira1, Cláudia Moreira1, José Manuel Salgado1

  • 1CEB - Centre of Biological Engineering, University of Minho, 4710-057, Braga, Portugal.

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|November 26, 2015
PubMed
Summary

Olive mill waste can be valorized by optimizing solid-state fermentation for lipase production. Aspergillus ibericus demonstrated the highest lipase yield using optimized conditions with olive pomace and wheat bran.

Keywords:
A. ibericusA. nigerA. tubingensislipase productionolive pomace (OP)solid-state fermentation (SSF)

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Area of Science:

  • Biotechnology
  • Industrial Microbiology
  • Enzyme Production

Background:

  • Olive mill waste poses an environmental challenge in the Mediterranean.
  • Novel methods for waste management and valorization are crucial.
  • Olive pomace (OP) is a potential substrate for microbial processes.

Purpose of the Study:

  • To optimize solid-state fermentation (SSF) for lipase production using olive pomace (OP).
  • To investigate the effects of various factors on lipase yield by Aspergillus spp.
  • To identify the most effective fungal strain for lipase biosynthesis from OP.

Main Methods:

  • Solid-state fermentation (SSF) using Aspergillus spp.
  • Optimization of key fermentation parameters: OP:wheat bran ratio, NaNO3 concentration, Czapek nutrients, fermentation time, moisture content (MC), and temperature.
  • Statistical analysis of experimental designs to determine significant factors.

Main Results:

  • The OP:WB ratio and MC were the most significant factors influencing lipase production across all tested fungi.
  • Optimized conditions (1:1 OP:WB, 60% MC, 30°C, 7 days) yielded a 4.4-fold increase in lipase for Aspergillus ibericus (90.5 U g⁻¹).
  • Maximum lipase activities for Aspergillus niger and Aspergillus tubingensis were 56.6 U g⁻¹ and 7.6 U g⁻¹, respectively.

Conclusions:

  • Aspergillus ibericus is the most promising strain for lipase production from OP and wheat bran mixtures.
  • Optimized SSF offers an effective strategy for valorizing olive mill waste into valuable enzymes.
  • The study highlights the potential of agro-industrial byproducts as substrates for industrial enzyme synthesis.