Bioconversion of Biomass for Effective Production of Biofuels as Well as Biobased Chemicals and Materials, 2nd Edition

A special issue of Fermentation (ISSN 2311-5637). This special issue belongs to the section "Industrial Fermentation".

Deadline for manuscript submissions: 31 March 2026 | Viewed by 230

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Department of Basic Science, College of Industrial Technology, Nihon University, 2-11-1 Shinei, Narashino 275-8575, Chiba, Japan
Interests: biomass conversion; fermentation; synthetic biology; environmental microbiology; microbial isolation; enzymes
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Special Issue Information

Dear Colleagues,

In recent years, from the perspectives of carbon neutrality and the UN Sustainable Development Goals, intensive studies have been conducted to develop technologies to convert biomass into fuels, chemicals, materials, etc. Biomass conversion technologies range from simple methods that use biomass as an energy source through combustion to more advanced developments that produce biofuels as well as biobased chemicals and materials through enzymatic hydrolysis and fermentation. Moreover, the level of achievement of these technologies ranges from the basic research stage to the demonstration stage to the practical application stage. Conversely, many kinds of biomass have not yet been effectively utilized, and many of the existing conversion technologies pose problems such as high production costs. An economical business model can be created through the development of biomass conversion technologies that overcome these problems, which contributes to the formation of a recycling-based society.

The purpose of this Special Issue is to present current achievements, challenges, and prospects in biomass conversion technology for the effective production of biofuels as well as biobased chemicals and materials. Such studies include, but are not limited to, the identification and effective utilization of novel microorganisms, metabolic engineering of microorganisms, pretreatment and enzymatic hydrolysis of biomass, microbial fermentation of biofuels as well as biobased chemicals and materials, improved fermentation technology for yield improvement and, the production as well as characterization of novel biobased chemicals and materials.

Dr. Hironaga Akita
Guest Editor

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Keywords

  • biomass conversion
  • enzymatic hydrolysis
  • microbial identification
  • metabolic engineering
  • microbial fermentation
  • biofuel
  • biobased chemicals and materials
  • industrial biotechnology

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Published Papers (1 paper)

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Research

13 pages, 1922 KB  
Article
Palladium Recovery from e-Waste Using Enterobacter oligotrophicus CCA6T
by Hironaga Akita
Fermentation 2026, 12(1), 3; https://doi.org/10.3390/fermentation12010003 (registering DOI) - 20 Dec 2025
Abstract
Palladium, a non-toxic platinum-group metal, is widely used in catalysis, electronics, hydrogen storage, and chemical industries because of its excellent physical and chemical properties. However, given that the number of palladium-producing countries is limited, recycling is considered essential for ensuring a stable and [...] Read more.
Palladium, a non-toxic platinum-group metal, is widely used in catalysis, electronics, hydrogen storage, and chemical industries because of its excellent physical and chemical properties. However, given that the number of palladium-producing countries is limited, recycling is considered essential for ensuring a stable and sustainable global supply. Here, I describe a simple and efficient method for palladium recovery from electronic waste (e-waste) using Enterobacter oligotrophicus CCA6T. To clarify biomineralization capacity, the role of electron donors in modulating biomineralization capacity was examined. Findings showed that formic acid was the most effective donor, enhancing the relative recovery rate to 44% compared to 23% without electron donors. Transmission electron microscopy analysis revealed palladium particles (1–10 nm) distributed across the cell wall, periplasmic space and cytoplasm, confirming active biomineralization rather than passive biosorption. Moreover, based on a comparison with the biomineralization mechanism of Escherichia coli, the biomineralization mechanism of E. oligotrophicus CCA6T was estimated . Reaction parameters were then optimized by testing the effects of formic acid concentration, reaction temperature, and reaction pH. Under optimized conditions, the relative recovery rate exceeded 99% within 6 h using 40 mg/L palladium. When this method was applied to a metal dissolution solution prepared from e-waste , a recovery rate of 94% was achieved from trace concentrations (36 µg/L), and palladium loss from bacteria after the palladium recovery test was negligible (<0.01%). Taken together, these results demonstrate that biomineralization using E. oligotrophicus CCA6T could potentially be applied to the recovery of palladium from e-waste, particularly for trace-level concentrations where conventional methods are ineffective. Full article
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