Valorization of Food Waste Using Solid-State Fermentation Technology

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

Deadline for manuscript submissions: 29 July 2025 | Viewed by 940

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Special Issue Information

Dear Colleagues,

This Special Issue emphasizes the development of solid-state fermentation as an integrative process for the valorization of food waste generated throughout the food supply chain, pursuing the development of high-impact and valuable products. Food waste generation is a huge issue that is currently concerning people, scientists, industries and governmental sectors due to its associated negative environmental and economic impact. Food waste is accumulated daily throughout the entire food supply chain, occurring during production (damaged food), post-harvest (non-compliant food), distribution (bruised food), processing (bagasse, peels, seeds), retailers (food remnants, offcuts) and final consumers (kitchen leftovers, rotten food). Interestingly, this waste still possesses substantial nutritional richness, most notably in carbohydrates, insoluble and soluble fibre (cellulose, hemicellulose, pectin and lignin), lipids and protein content, as well as having a small concentration of minerals and bioactive compounds such as phenolics and carotenoids. Such richness and also the high availability of waste can be exploited in order to obtain different multi-purpose products through the application of a bioprocess carried out by microorganisms called solid-state fermentation, in which the microorganism can naturally grow and use the lignocellulosic waste as a carbon source. Among the value-added derived products obtained from the fermentation process are single cell proteins for animal feed, catalytic enzymes with high specificity and activity, simple sugars that can be directed to bioethanol production and oligosaccharides for the formulation of prebiotic ingredients that could also lead to a release/accumulation of natural antioxidant and antimicrobials agents of phenolic and carotenoid nature. This issue, focusing on the fermentative process for food waste valorization, will include multidisciplinary areas comprising biotechnology, food science and technology and food chemistry and engineering. We invite research articles that cover an ample scope of lignocellulosic food waste from the processing of any type of crop, including cereals, vegetables and fruit, as well as plants and trees, which are applied as a support source for microbial development. All types of articles related with the fermentation process, including original research, opinions and reviews, are welcome.

Prof. Dr. Cristóbal Noé Aguilar González
Dr. María L. Flores-López
Guest Editors

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Keywords

  • food waste valorization
  • circular bioeconomy
  • biotechnological processes
  • integrative bioprocess
  • solid state fermentation
  • dark fermentation
  • microbial growth
  • lignocellulosic enzyme production
  • bioactive compounds releasement

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Published Papers (1 paper)

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17 pages, 1011 KiB  
Article
Bioprocessing of Spent Coffee Grounds as a Sustainable Alternative for the Production of Bioactive Compounds
by Karla A. Luna, Cristóbal N. Aguilar, Nathiely Ramírez-Guzmán, Héctor A. Ruiz, José Luis Martínez and Mónica L. Chávez-González
Fermentation 2025, 11(7), 366; https://doi.org/10.3390/fermentation11070366 - 26 Jun 2025
Viewed by 266
Abstract
Spent coffee grounds are the most abundant waste generated during the preparation of coffee beverages, amounting to 60 million tons per year worldwide. Excessive food waste production has become a global issue, emphasizing the need for waste valorization through the bioprocess of solid-state [...] Read more.
Spent coffee grounds are the most abundant waste generated during the preparation of coffee beverages, amounting to 60 million tons per year worldwide. Excessive food waste production has become a global issue, emphasizing the need for waste valorization through the bioprocess of solid-state fermentation (SSF) for high added-value compounds. This work aims to identify the operational conditions for optimizing the solid-state fermentation process of spent coffee grounds to recover bioactive compounds (as polyphenols). An SSF process was performed using two filamentous fungi (Trichoderma harzianum and Rhizopus oryzae). An exploratory design based on the Hunter & Hunter method was applied to analyze the effects of key parameters such as inoculum size (spores/mL), humidity (%), and temperature (°C). Subsequently, a Box–Behnken experimental design was carried out to recovery of total polyphenols. DPPH, ABTS, and FRAP assays evaluated antioxidant activity. The maximum concentration of polyphenols was observed in treatment T3 (0.279 ± 0.002 TPC mg/g SCG) using T. harzianum, and a similar result was obtained with R. oryzae in the same treatment (0.250 ± 0.011 TPC mg/g SCG). In the Box–Behnken design, the most efficient treatment for T. harzianum was T12 (0.511 ± 0.017 TPC mg/g SCG), and for R. oryzae, T9 (0.636 ± 0.003 TPC mg/g SCG). These extracts could have applications in the food industry to improve preservation and functionality. Full article
(This article belongs to the Special Issue Valorization of Food Waste Using Solid-State Fermentation Technology)
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