Studies of a Lignin-Carbohydrate Complex. Pt. I. The Isolation of a Water Soluble Lignin-Carbohydrate Complex from Alkali Extraction of<i>Eucalyptus obliqua</i>

Merewether, J. W. T.; Samsuzzaman, Lohani A. M.

doi:10.1515/hfsg.1972.26.1.11

Cited by 13 publications

(7 citation statements)

References 13 publications

(15 reference statements)

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“…The filtrate was passed through a cation exchange resin column (Amberlite IR-I2O) and the eluate was concentrated under reduced pressure. Free sugars could not be detected in the hydrolysate by two dimensional paper Chromatographie examination (Merewether/Samsuzzaman 19723).…”

Section: Partial Acid Hydrolysis Of the Lignin-carbohydrate Complexmentioning

confidence: 90%

“…It was filtered and the nitrate was concentrated under reduced pressure. Free sugars were shown to be absent by two dimensional paper Chromatographie examination (Merewether/Samsuzzaman 19723). The nitrate was diluted with 80% acetic acid (20 ml) and the hydrogenation reaction was continued for 6 hours.…”

Section: Methodsmentioning

confidence: 99%

“…The gas-liquid Chromatographie examinations of the unknown and standard samples were carried out by following the same method as described earlier (Merewether/Samsuzzaman 19723). Xylose, arabinose, glucose, galactose and other unknown compounds were shown to be present in the hydrolysate of the hydrogenated lignin-carbohydrate complex (Fig.…”

Section: Acetylation Of Alditolsmentioning

confidence: 99%

“…The filtrate was deionised by passing through cation exchange resin column (Amberlite IR-I2O) and the eluate was concentrated under reduced pressure. Two dimensional paper Chromatographie examinations (Merewether/Samsuzzaman 19723) of the hydrolysate showed the presence of xylose, arabinose, galactose and compound I. The relative proportions of the monosaccharides were determined as alditol acetates by gas-liquid Chromatographie examinations and the results are shown in Table 5.…”

Section: Periodate Oxidation Of the Lignin-carbohydrate Complexmentioning

confidence: 99%

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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: Partial Acid Hydrolysis Of the Lignin-carbohydrate Complexmentioning

confidence: 90%

Section: Methodsmentioning

confidence: 99%

Section: Acetylation Of Alditolsmentioning

confidence: 99%

Section: Periodate Oxidation Of the Lignin-carbohydrate Complexmentioning

confidence: 99%

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

Merewether¹,

Samsuzzaman²,

Cooke³

1972

Holzforschung

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“…In a previous communication (Merewether/Samsuzzaman 1972) the isolation of a water soluble lignincarbohydrate complex from the dilute alkaline extraction of Eucalyptus obliqua was reported. It was found to contain 33% sugar and 19.1% Klason lignin.…”

Section: Introductionmentioning

confidence: 97%

Studies on a Lignin-Carbohydrate Complex. Pt. II. Characterisation of the Water-Soluble Lignin-Carbohydrate Complex

Merewether¹,

Samsuzzaman²,

Calder³

1972

Holzforschung

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Pulp

Kadla¹,

Dai²

2006

Kirk-Othmer Encyclopedia of Chemical Technology

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Pulp, the raw material used in the production of paper, paperboard, fiberboard, and other similar manufactured products, is produced from wood and nonwood plant matter by separating cellular components using mechanical and/or chemical methods. Wood is the dominant source of fiber used in the manufacture of pulp in the western hemisphere. Nonwood fiber sources are used in those locations where wood is in short supply or for pulps requiring special characteristics. In addition to wood, recovered (recycled) fiber represents a growing segment of the overall fiber supply worldwide. Commercial pulp is classified according to the method of manufacture as mechanical, chemical, chemimechanical, and semichemical. Economic factors, product requirements, and desired fiber properties determine the method of pulping. Mechanical pulps, produced through the application of mechanical energy, give rise to materials having high yield, small average particle size, high opacity, and excellent printing characteristics. Mechanical pulps have some undesirable properties, such as low tensile strength and lack of permanence. Chemical pulps are produced by digesting wood using chemicals to remove lignin, extractives, and low molecular weight polysaccharides, frequently resulting in the loss of wood solids that are dissolved during the pulping and bleaching processes. Chemical pulps are used in the bleached or the unbleached state and are composed of longer, stronger fibers that are more stable than mechanical pulps, but have lower yields and less desirable print qualities. Chemimechanical and semichemical pulps are produced in hybrid processes based on the application of both chemicals and mechanical energy. Wood solids originating in the pulping process are recovered in the form of steam and electrical energy. Pulping chemicals are also recovered for reuse in the manufacturing process. Environmental management includes improvements in chemical recovery, process modification to minimize the use of elemental chlorine, and the treatment of process waste streams.

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Studies of a Lignin-Carbohydrate Complex. Pt. I. The Isolation of a Water Soluble Lignin-Carbohydrate Complex from Alkali Extraction ofEucalyptus obliqua

Cited by 13 publications

References 13 publications

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

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

Studies on a Lignin-Carbohydrate Complex. Pt. II. Characterisation of the Water-Soluble Lignin-Carbohydrate Complex

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