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Item type:Publication, Access status: without files , Recovery of prebiotic carbohydrates from side streams of biorefineries exemplified by fructans and pentosans from bioethanol thin stillage(2023-06-07); One of the main challenges in existing biorefineries is the insufficient product diversification. The valorization of side streams, here exemplified by bioethanol stillage, may widen the product portfolio and thereby may improve economic efficiency of bioethanol production plants. Valuable carbohydrates, namely fructans and pentosans, can be found in bioethanol stillage. Fructans are long-chain carbohydrates consisting almost exclusively of fructose monomers (C6-sugars), while pentosans are a group of carbohydrates, mainly built from the C5-sugars arabinose and xylose. Both types of carbohydrates belong to the group of prebiotics making them especially interesting for food and feed applications. Therefore, prebiotics from stillage offer the potential for a provision of value food and feed components besides fuel production. Currently most literature deals with Dried Distiller’s Grains (with solubles) (DDG(S)) in order to obtain proteins or pentosans. However, this side stream has already competitive utilization paths such as animal feed. Against this background, thin stillage is especially interesting as competitive utilizations hardly exist. The main objective of this research project is to develop an integrated process for the production of prebiotic carbohydrates from bioethanol thin stillage. Within this work, a new process concept for the production of prebiotics, in particular pentosans and (partly fructans), is investigated and assessed. Against this background, this work contributes to a holistic utilization of biomass and to the idea of a bioeconomic approach. The results show only small mounts of fructans (about 0.5 %DM) but significant amounts of pentosans to present in thin stillage (about 15 to 20 %DM), mainly allocated in the liquid phase. By means of chemical, biochemical and hydrothermal treatments pentosans from the solid phase can be dissolved as well allowing for their subsequent purification. Based hereon, a promising process pathway for the production of especially pentosans has been identified. However, further research is required for the investigation of such purification step(s).Publicationtype: Conference Poster22 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Quantification of fructans in cereal-based bioethanol stillage based on a simplified analytical methodBackground and Objectives Cereal-based bioethanol stillage, the main by-product of industrial bioethanol production, is a potential substrate for fructans. However, the quantification of fructans in such complex sample matrices is still a challenge for the corresponding analytics to be overcome to allow for the identification and utilization of such unused fructan sources. Especially a possible utilization or rather the corresponding process development requires appropriate analytics first. Thus, this paper aims to develop and apply a method for fructan quantification in bioethanol stillage using common a high-performance liquid chromatography–refractive index detector. Findings A new approach for fructan quantification is presented allowing for simple fructan determination in bioethanol stillage for comparably high sample throughput. The developed analytical method performs fructan quantification by means of fructose- and glucose-equivalent determination after targeted acidic hydrolysis adapted to the respective sample matrix. On the basis of this method, up to 2.5% of fructans were found in the dry matter of cereal-based bioethanol stillage. Conclusion Cereal-based bioethanol stillage is assessed to be a potential source of fructans. The presented analytical method can be the basis for respective process development and, thus, may contribute to a higher-value utilization of stillage. Significance and Novelty According to current knowledge, no determination of fructans in stillage or corresponding analytical methods have been published so far.Publicationtype: Journal ArticleScopus© Citations 2 91 167