Enzymatische Abbauversuche an schwinggemahlenem Holz und Zellstoff

Grohn, H.; Schierbaum, Fritz

doi:10.1515/hfsg.1958.12.3.65

Cited by 14 publications

(5 citation statements)

References 5 publications

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“…The inability of emulsin to hydrolyse sugar units completely from the complex can be explained in a number of ways such as, the carbohydrate is attached to lignin at a hindered position, the linkage between lignin and carbohydrate is other than glycosidic, or simply because the complex eventually precipitated. This result is in agreement with the results obtained by others (Grohn/Schierbaum 1958;Pew 1957;Pew/Weyna 1962). Hayashi (1961) suggested the presence of phenol-β-D-glycosidic linkage between lignin and carbohydrate from the increase in phenolic hydroxyl groups on treatment with alkali or enzymes.…”

Section: Resultssupporting

confidence: 94%

Studies on a Lignin-Carbohydrate Complex. Pt. III. Nature of the Complex

Merewether¹,

Samsuzzaman²,

Cooke³

1972

Holzforschung

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Keywords Lignin-carbohydrate complex Catalytic hydrogenation Partial hydrolyses Enzymic hydrolysis Periodate oxidation Nature of polysaccharide Benzyl-ether linkage Eucalyptus obliqua Schlüsselwörter (Sachgebiete) Lignin-KohlenhydratKomplex Katalytische Hydrogenierung Partielle Hydrolyse Enzymatische Hydrolyse Perj odat-Oxy dation Polysaccharid-Beschaffenheit Benzyl-Äther-Bindung Eucalyptus obliqua Studies on a Lignin-Carbohydrate Complex. Pt. III. Nature of the Complex SummaryThe catalytic hydrogenation of the lignin-carbohydrate complex showed that the unidentified compound I obtained after acid hydrolysis of the complex was an alkaline degradation product of glucose. The relative proportions of the monosaccharides in the carbohydrate fraction of the complex were determined as their alditol acetates by gas-liquid chromatography. From partial acid and enzymic hydrolyses and periodate oxidation reaction it has been suggested that the carbohydrate fraction of the complex is highly branched. The nature of the polysaccharides attached to the lignin are possibly xylan and araban types. It has been postulated from the results obtained from the catalytic hydrogenation and enzymic hydrolysis of the complex, that the carbohydrate is bonded to lignin, either at a non-benzylic position or possibly at a sterically hindered benzylic position. Studien über den Lignin-Kohlenhydrat-Komplex. III. Beschaffenheit des Komplexes Zusammenfassung Die katalytische Hydrogenierung des Lignin-Kohlenhydrat-Komplexes zeigte, daß die nach Säurehydrolyse des Komplexes erhaltene, nicht identifizierte Verbindung I ein alkalisches Abbauprodukt der Glukose war. Die relativen Monosaccharid-Anteile in der Kohlenhydratfraktion des Komplexes wurden als ihre Alditol-Acetate durch Gas-Flüssigkeits-Chromatographie bestimmt. Aufgrund der partiellen Säure-und enzymatischen Hydrolysen sowie der PerjodatOxydation wurde angenommen, daß die Kohlenhydratfraktion des Komplexes stark verzweigt ist. Die am Lignin hängenden Polysaccharide sind möglicherweise vom Xylan-und Araban-Typ. Aufgrund der aus der katalytischen Hydrogenierung und enzymatischen Hydrolyse des Komplexes erhaltenen Ergebnisse wurde festgestellt, daß die Kohlenhydrate an das Lignin gebunden sind, und zwar entweder in einer nicht Benzyl-oder möglicherweise in einer sterisch gehinderten Benzyl-Siellung.

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Section: Resultssupporting

confidence: 94%

Studies on a Lignin-Carbohydrate Complex. Pt. III. Nature of the Complex

Merewether¹,

Samsuzzaman²,

Cooke³

1972

Holzforschung

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“…. Furthermore, it was reported that, by thorough milling of cellulose and spruce wood, water‐soluble products (WSPs) were obtained . However, owing to the prolonged milling duration, high energy inputs are required to obtain significant yields of WSPs.…”

Section: Introductionmentioning

confidence: 99%

Kinematic Modeling of Mechanocatalytic Depolymerization of α‐Cellulose and Beechwood

et al. 2018

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Mechanocatalytic depolymerization of lignocellulose presents a promising method for the solid-state transformation of acidified raw biomass into water-soluble products (WSPs). However, the mechanisms underlining the utilization of mechanical forces in the depolymerization are poorly understood. A kinematic model of the milling process is applied to assess the energy dose transferred to cellulose during its mechanocatalytic depolymerization under varied conditions (rotational speed, milling time, ball size, and substrate loading). The data set is compared to the apparent energy dose calculated from the kinematic model and reveals key features of the mechanocatalytic process. At low energy doses, a rapid rise in the WSP yield associated with the apparent energy dose is observed. However, at a higher energy dose obtained by extended milling duration or high milling speeds, the formation of a substrate cake layer on the mill vials appear to buffer the mechanical forces, preventing full cellulose conversion into WSPs. By contrast, for beechwood, there exists a good linear dependence between the WSP yield and the energy dose provided to the substrate over the entire range of WSP yields. As the formation of a substrate cake in depolymerization of beechwood is less severe than that for the cellulose experiments, the current results verify the hypothesis regarding the negative effect of a substrate layer formed on the mill vials upon the depolymerization process. Overall, the current findings provide valuable insight into relationships between the energy dose and the extent of cellulose depolymerization effected by the mechanocatalytic process.

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“…1 In mechanical pulping, the internal processes leading to the deconstruction of wood are predominantly physical in nature. 2 Surprisingly, although mechanical processing of biomass has been long established, 3,4 the combination of acid catalysis and mechanical forces in a 'one-pot process ' has not yet been extensively studied for performing processes that are chemical in nature, such as catalytic biomass conversion. Only recently have some reports on solvent-free approaches for the acid-catalyzed depolymerization of cellulosedriven by mechanical forcesemerged in the literature.…”

Section: Introductionmentioning

confidence: 99%