The “as eaten” method to measure the Total Dietary Fibre content and an in vitro fermentation with colon bacteria were successfully coupled to see if fibre fractions have a prebiotic effect. Similar growth pattern for modified starch, FOS and GOS were observed (Fig A). The qPCR results indicate a significant stimulation of the growth of gut bacteria by FOS and GOS and in lesser extent by the modified starch (Fig.C). Future experiments will compare the qPCR data with metagenomic analysis of in vitro and in vivo experiments.
DOCUMENT
The transition to a biobased economy necessitates utilizing renewable resources as a sustainable alternative to traditional fossil fuels. Bioconversion is a way to produce many green chemicals from renewables, e.g., biopolymers like PHAs. However, fermentation and bioconversion processes mostly rely on expensive, and highly refined pure substrates. The utilization of crude fractions from biorefineries, especially herbaceous lignocellulosic feedstocks, could significantly reduce costs. This presentation shows the microbial production of PHA from such a crude stream by a wild-type thermophilic bacterium Schlegelella thermodepolymerans [1]. Specifically, it uses crude xylose-rich fractions derived from a newly developed biorefinery process for grassy biomasses (the ALACEN process). This new stepwise mild flow-through biorefinery approach for grassy lignocellulosic biomass allows the production of various fractions: a fraction containing esterified aromatics, a monomeric xylose-rich stream, a glucose fraction, and a native-like lignin residue [2]. The crude xylose-rich fraction was free of fermentation-inhibiting compounds meaning that the bacterium S.thermodepolymerans could effectively use it for the production of one type of PHA, polyhydroxybutyrate. Almost 90% of the xylose in the refined wheat straw fraction was metabolized with simultaneous production of PHA, matching 90% of the PHA production per gram of sugars, comparable to PHA yields from commercially available xylose. In addition to xylose, S. thermodepolymerans converted oligosaccharides with a xylose backbone (xylans) into fermentable xylose, and subsequently utilized the xylose as a source for PHA production. Since the xylose-rich hydrolysates from the ALACEN process also contain some oligomeric xylose and minor hemicellulose-derived sugars, optimal valorization of the C5-fractions derived from the refinery process can be obtained using S. thermodepolymerans. This opens the way for further exploration of PHA production from C5-fractions out of a variety of herbaceous lignocellulosic biomasses using the ALACEN process combined with S. thermodepolymerans. Overall, the innovative utilization of renewable resources in fermentation technology, as shown herein, makes a solid contribution to the transition to a biobased economy.[1] W. Zhou, D.I. Colpa, H. Permentier, R.A. Offringa, L. Rohrbach, G.J.W. Euverink, J. Krooneman. Insight into polyhydroxyalkanoate (PHA) production from xylose and extracellular PHA degradation by a thermophilic Schlegelella thermodepolymerans. Resources, Conservation and Recycling 194 (2023) 107006, ISSN 0921-3449, https://doi.org/10.1016/j.resconrec.2023.107006. [2] S. Bertran-Llorens, W.Zhou. M.A.Palazzo, D.I.Colpa, G.J.W.Euverink, J.Krooneman, P.J.Deuss. ALACEN: a holistic herbaceous biomass fractionation process attaining a xylose-rich stream for direct microbial conversion to bioplastics. Submitted 2023.
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In the context of global efforts to increase sustainability and reduce CO2 emissions in the chemical industry, bio-based materials are receiving increasing attention as renewable alternatives to petroleum-based polymers. In this regard, Visolis has developed a bio-based platform centered around the efficient conversion of plant-derived sugars to mevalonolactone (MVL) via microbial fermentation. Subsequently, MVL is thermochemically converted to bio-monomers such as isoprene and 3-methyl-1,5-pentane diol, which are ultimately used in the production of polymer materials. Currently, the Visolis process has been optimized to use high-purity, industrial dextrose (glucose) as feedstock for their fermentation process. Dutch Sustainable Development (DSD) has developed a direct processing technology in which sugar beets are used for fermentation without first having to go through sugar extraction and refinery. The main exponent of this technology is their patented Betaprocess, in which the sugar beet is essentially exposed to heat and a mild vacuum explosion, opening the cell walls and releasing the sugar content. This Betaprocess has the potential to speed up current fermentation processes and lower feedstock-related costs. The aim of this project is to combine aforementioned technologies to enable the production of mevalonolactone using sucrose, present in crude sugar beet bray after Betaprocessing. To this end, Zuyd University of Applied Sciences (Zuyd) intends to collaborate with Visolis and DSD. Zuyd will utilize its experience in both (bio)chemical engineering and fermentation to optimize the process from sugar beet (pre)treatment to product recovery. Visolis and DSD will contribute their expertise in microbial engineering and low-cost sugar production. During this collaboration, students and professionals will work together at the Chemelot Innovation and Learning Labs (CHILL) on the Brightlands campus in Geleen. This collaboration will not only stimulate innovation and sustainable chemistry, but also provides starting professionals with valuable experience in this expanding field.
This project is aimed to identify stakeholders/partners active/interested in products based upon fermentation in the Northern Netherlands/Niedersachsen region, to create synergism and mutually elaborate the fermentation technology to stimulate economic growth and contribute to the circular/bio-based transition. Furthermore it is also aimed to stimulate and coordinate educational programs in the field of bioprocessing/fermentation in order to meet the requirements of industry (well-educated professionals).
Fungal colorants offer a sustainable alternative to synthetic colors, which are derived from fossil fuels and contribute to environmental pollution. While fungal colorants could be effectively produced through precision fermentation by microorganisms, their adoption in industry remains limited due to challenges in processing, formulation, and application. ColorFun aims to bridge the gap between laboratory research, artisanal practices, and industrial needs by developing a scalable and adaptable colorant processing system. Building on the TUFUCOL project, which focused on optimizing fungal fermentation, ColorFun consortium gears the focus to downstream processing and industrial applications by using green chemistry. Many SMEs have explored fungal colorants using traditional methods, but due to lack of consistency and reproducibility, they are unsuitable for large-scale production. Meanwhile, lab research usually does not translate directly to industrial applications. Researchers can fine-tune processes under controlled conditions while large-scale production requires consistent formulations that work across different material substrates and processing environments. Without bridging these gaps, fungal colorants remain confined to research and small-scale applications rather than becoming viable industrial alternatives. Instead of developing separate solutions for each sector, ColorFun is working towards a set of standardized extraction and stabilization methods for a stable base colorant product. This pre-processed colorant can then be adjusted by different industries to meet their specific needs. This approach ensures both efficiency in production and flexibility in application. Professionals will collaborate in a test-improve-test circle, ColorFun will refine these formulations to ensure they work in real-world conditions. Students will be involved in the project, contributing to curriculum developments in biotechnology, chemistry, and materials science. Combining efforts, ColorFun lowers the barriers aiding fungal colorants to become a mainstream alternative to synthetic feedstocks. By making these colorants scientifically validated, industrially viable, and commercially adaptable, the project helps accelerate the transition to sustainable color solutions and circular economy.
