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Item type:Publication, Access status: with files , Pentosane aus Bioethanolschlempe – Untersuchung von Prozessoptionen für DünnschlempeThe increasing demand for dietary fibre in human and animal nutrition requires the use of previously unused resources. Pentosans, a major source of dietary fiber in cereals, are also found in bioethanol stillage, a by-product of bioethanol production. This work investigates options of producing and enriching pentosans from bioethanol stillage. For this purpose, analytical methods for the pentosans are developed and the stillage is comprehensively characterised. The results show that pentosans are particularly enriched in the liquid phase of the thin stillage. The process developed on this basis comprises a solid-liquid separation, a solubilization step and further purification by means of filtration. In this way, a product with a pentosan content of more than 50 %DM can be obtained.Publicationtype: Doctoral Thesis84 40 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Rye bran as a component in the diets of lactating sows : effects on sow and piglet performance(Multidisciplinary Digital Publishing Institute (MDPI), 2024-01-24); ; ; ; From a cost and sustainability perspective, the use of by-products such as rye bran in sow diets is of particular interest. Rye bran has valuable ingredients that have potential benefits for the gut health of sows. The aim of this study was to investigate the effects of including 15% rye bran in the sows’ feed on the performance of sows and piglets. The feeding started one week before the farrowing date and ended at weaning. Performance was evaluated by measuring sow (n = 175) and piglet body weight (n = 1372) and sows’ backfat thickness (n = 80). These data were additionally used to calculate the colostrum intake of the suckling piglets and the sows’ milk production. It was found that there were no differences in the performance parameters between the experimental and control groups. However, this study showed that the piglets with light birth weight (LBW (<1000 g)) and medium birth weight (MBW (1000-1500 g) consumed more colostrum when the sows were fed rye bran (LBW: C/R 203.0 +/- 39.2 g/214.3 +/- 35.9 g; MBW: 291.3 +/- 39.0 g/298.5 +/- 36.4 g). It can be concluded that including 15% rye bran in the feed of lactating sows has no obvious negative effects on the performance of sows and piglets. Further studies are needed to evaluate the possible positive effects of rye bran.Publicationtype: Journal Article29 58 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Grundlagen biochemischer KonversionenBiomasse kann durch biochemische Verfahren in End- bzw. Nutzenergie umgewandelt werden. Die einer derartigen Umwandlung zugrunde liegenden wesentlichen biologischen Grundlagen – und die daraus resultierenden Anforderungen an die Verfahrenstechnik – werden in diesem Kapitel diskutiert. Dazu wird zunächst auf den Aufschluss der Biomasse eingegangen, da biochemische Konversionsprozesse typischerweise langsam sind und deshalb eine große innere Oberfläche, auf der die Biokatalysatoren aktiv werden können, benötigt wird. Diskutiert werden die entsprechenden mechanischen, physikalischen und chemischen Prinzipien. Danach wird zunächst auf die Grundlagen der biochemischen Konversion – und die sie bestimmenden Determinanten – eingegangen; in diesem Kontext werden auch wesentliche Begriffe diskutiert, die in diesem Zusammenhang immer wieder fallen. Anschließend werden sowohl für Enzym-katalysierte als auch für mikrobiologische Umsetzungen jeweils der Aufbau und die Funktion, die Grundlagen der entsprechenden Kinetik und neben potenziellen Hemmungsmechanismen auch exemplarische industrielle Anwendungsfälle dargestellt und vertieft. Final werden ausgehend davon die verfahrenstechnischen „Leitplanken“ einer technischen Umsetzung derartiger Prozesse zur Erzeugung von Energieträgern und / oder Plattformchemikalien begründet abgeleitet und diskutiert; diese stecken quasi das Feld ab, innerhalb dessen sich die verfahrenstechnischen Lösungen bewegen müssen.Publicationtype: Book Part37 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Bioethanolerzeugung(Springer, 2024); ; ; ; Ziel dieses Kapitels ist die Darstellung einer Ethanolerzeugung aus zucker-, stärke- bzw. cellulosehaltiger Biomasse. Dazu wird zunächst auf die biologischen Grundlagen der alkoholischen Gärung beispielsweise mithilfe von Hefen eingegangen, wie sie heute in den kommerziellen Ethanolerzeugungsanlagen großtechnisch umgesetzt wird. Danach wird die entsprechende Verfahrenstechnik diskutiert; dies gilt für Zucker-, Stärke- und Lignocellulose-haltige Input-Materialien und umfasst die Schritte „Bereitstellung einer fermentierbaren Zuckerlösung“, „alkoholische Gärung“, „Destillation“ und „Absolutierung“. Auch wird erörtert, wie die verschiedenen weiteren Stoffströme, die infolge der großtechnischen Ethanolerzeugung neben dem gewünschten Hauptprodukt „Ethanol“ zwingend anfallen, sinnvoll im Rahmen integrierter Gesamtkonzepte nutzbar gemacht werden können. Final wird dann noch auf die Nutzungsmöglichkeiten der jeweiligen Alkohole und der weiteren in Koppelproduktion anfallenden Nebenströme eingegangen.Publicationtype: Book Part24 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Process options for the recovery of a pentosan-enriched fraction from wheat-based bioethanol thin stillageAim: Stillage, the main residue from cereal-based bioethanol production, offers a great potential for the recovery of pentosan-type carbohydrates. Therefore, potential process options for the recovery of pentosans from bioethanol thin stillage are investigated and their basic feasibility is demonstrated on a laboratory scale. Findings: The main result of this work is the development of a three-stage process for pentosan recovery, including solid–liquid separation, pentosan solubilisation and purification. The pentosan content of the thin stillage used here was determined to be about 14% related to dry matter (DM). By means of solid–liquid separation, these pentosans accumulate in the liquid phase (up to 80%), while the remainder (about 20%) is found in the solid phase. Solubilisation of these insoluble pentosans was achieved by using either a hydrothermal, an alkaline or an enzymatic treatment. Here, the results indicate a maximum solubilisation yield of 90% with a hydrothermal treatment using liquid hot water at 180 °C. Ultrafiltration and precipitation are investigated for purification. The most promising process option in this study is solid–liquid separation followed by ultrafiltration. In this case, the total pentosan yield is assessed to be about 48% (based on thin stillage) with a final pentosan concentration of about 30%DM. Graphical Abstract: [Figure not available: see fulltext.]Publicationtype: Journal ArticleScopus© Citations 1 38 42 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Rye and rye bran as components of diets in piglet production : effects on Salmonella Prevalence(Multidisciplinary Digital Publishing Institute (MDPI), 2023-07-10); ; ; ; The nutritional benefits of rye (and therefore rye bran) are mainly due to its high content of fermentable dietary fiber, the non-starch polysaccharides (NSP). Microorganisms in the large intestine are able to convert these into short-chain fatty acids (SCFA), including butyrate. Butyrate strengthens the epithelial barrier function in the colon by nourishing the enterocytes and inhibiting the spread of Salmonella in the intestinal tract. Therefore, the aim of this study was to test under field conditions whether a diet with rye or rye bran as the main ingredient for gilts, sows, and weaned piglets is associated with a lower Salmonella prevalence. Depending on the age groups, between 20-30% rye or between 15-20% rye bran was used in the experimental group. A total of n = 1983 boot swabs, n = 356 fecal samples, and n = 1909 serum samples were examined. The results of this study show that rye or rye bran at the levels used had no apparent effect on the number of positive Salmonella samples. However, the Salmonella OD values in the experimental groups were significantly lower than in the control group. This suggests that the use of rye leads to a lower incidence of infection, but this effect could not be proven from swabs.Publicationtype: Journal ArticleScopus© Citations 1 54 88 - Some of the metrics are blocked by yourconsent settings
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 , Plant-based fructans for increased animal welfare: provision processes and remaining challengesFructans are carbohydrates consisting of fructose monomers linked by β-2,1- and/or β-2,6-glycosidic bonds with linear or branched structure. These carbohydrates belong to the group of prebiotic dietary fibre with health-promoting potential for humans and mammals due to their indigestibility and selective stimulation of microorganisms in the gastrointestinal tract. This makes fructans interesting mainly for healthy food as well as animal feed applications. As a consequence of a growing public awareness for animal welfare, dietary fibre and thus fructans move into the focus as a fibre-rich feeding improving not only animals’ health but also their well-being. Against this background, this paper summarises the known effects of fructans focusing on pigs and highlights the state of the art in fructan production processes from plant material as well as selected current research lines. Additionally, an attempt is made to assess the potential of European fructan production for an application as animal feed. Based on this, challenges in the field of fructan production are addressed and alternative substrates for fructans are discussed and pointed out.Publicationtype: Review ArticleScopus© Citations 7 121 139 - 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 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Characterisation and recovery of prebiotic carbohydrates from side-streams of biorefineriesPublicationtype: Conference Paper37