Isolation and characterization of galactoglucomannan from spruce ( Picea abies )

Lundqvist, Jon; Teleman, Anita; Junel, Linda; Zacchi, Guido; Dahlman, Olof; Tjerneld, Folke; Stålbrand, Henrik

doi:10.1016/s0144-8617(01)00210-7

Cited by 225 publications

(153 citation statements)

References 20 publications

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“…Lignocellulose (mainly celluloses, hemicelluloses, and lignin) constitutes a renewable raw material that is widely available in the form of waste from agricultural residues such as sugarcane bagasse, cereal straw, peat moss, wool, rice hulls, coconut coir, and corn cob (Lundqvist et al 2002). Because lignocellulose has high oil adsorption capacity, and is biodegradable, renewable, environmental friendly, inexpensive, and is easily available, it has been a subject of interest among researchers to further reveal its capability as oil sorbents.…”

Section: Introductionmentioning

confidence: 99%

Esterified Coconut Coir by Fatty Acid Chloride as Biosorbent in Oil Spill Removal

Yusof¹,

Mukhair²,

Malek³

et al. 2015

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aCoconut coir, an agricultural waste, was chemically modified using esterification by fatty acid chloride (oleoyl chloride and octanoate chloride) for oil spill removal purposes. The modified coir (coir-oleate and coir-octanoate) were characterized by spectroscopy, thermal studies, contact angle, and morphological studies. The modified coir exhibited an enhancement towards the hydrophobic property but a decreased thermal stability. The oil adsorption performance was tested using a batch adsorption system. The effect of sorbent dosage, oil concentration, and effect of adsorption time on the adsorption capacity of the modified coir were also studied. From the analysis, the long chain oleoyl chloride (C18) was shown to be a better modifier compared to octanoate chloride (C8). The isotherm study indicated that the oil adsorption fitted well to a Langmuir model rather than Freundlich model. From the kinetic study, the result revealed a good fit in pseudo-second order model for all samples studied. The study therefore suggests that esterified coconut coir can serve as a potential biomaterial for the adsorption of spilled oil during operational failures.

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Section: Introductionmentioning

confidence: 99%

Esterified Coconut Coir by Fatty Acid Chloride as Biosorbent in Oil Spill Removal

Yusof¹,

Mukhair²,

Malek³

et al. 2015

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“…P lant ␤-mannans are abundant cell wall polysaccharides having a ␤-1,4-linked mannan backbone, in some cases interrupted by glucose units. Backbone mannose can also have appended galactose side groups linked by ␣-1,6-bonds, such as in galactomannans and in galactoglucomannan, the major softwood hemicellulose (1,2). Konjac glucomannan and carob and guar gum galactomannans are storage polysaccharides, often used in foods because of their gelling properties (3,4).…”

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confidence: 99%

Expression and Characterization of a Bifidobacterium adolescentis Beta-Mannanase Carrying Mannan-Binding and Cell Association Motifs

Kulcinskaja

Rosengren

Ibrahim

et al. 2013

Appl Environ Microbiol

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The gene encoding ␤-mannanase (EC 3.2.1.78) BaMan26A from the bacterium Bifidobacterium adolescentis (living in the human gut) was cloned and the gene product characterized. The enzyme was found to be modular and to contain a putative signal peptide. It possesses a catalytic module of the glycoside hydrolase family 26, a predicted immunoglobulin-like module, and two putative carbohydrate-binding modules (CBMs) of family 23. The enzyme is likely cell attached either by the sortase mechanism (LPXTG motif) or via a C-terminal transmembrane helix. The gene was expressed in Escherichia coli without the native signal peptide or the cell anchor. Two variants were made: one containing all four modules, designated BaMan26A-101K, and one truncated before the CBMs, designated BaMan26A-53K. BaMan26A-101K, which contains the CBMs, showed an affinity to carob galactomannan having a dissociation constant of 0.34 M (8.8 mg/liter), whereas BaMan26A-53K did not bind, showing that at least one of the putative CBMs of family 23 is mannan binding. For BaMan26A-53K, k cat was determined to be 444 s ؊1 and K m 21.3 g/liter using carob galactomannan as the substrate at the optimal pH of 5.3. Both of the enzyme variants hydrolyzed konjac glucomannan, as well as carob and guar gum galactomannans to a mixture of oligosaccharides. The dominant product from ivory nut mannan was found to be mannotriose. Mannobiose and mannotetraose were produced to a lesser extent, as shown by high-performance anion-exchange chromatography. Mannobiose was not hydrolyzed, and mannotriose was hydrolyzed at a significantly lower rate than the longer oligosaccharides.

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“…1 is 125.6 kJ/mol. Typical autohydrolysis pretreatment times range from minutes to several hours, depending on the wanted outcomes (i.e., molecular properties of the dissolved hemicelluloses and lignin, formation of unwanted degradation products, and pulping properties of the pretreated wood) Besides the conventional autohydrolysis, microwave-assisted HWE has been used for extraction of hemicelluloses with high yield from spruce chips (Lundqvist et al 2002(Lundqvist et al ,2003. This treatment strongly shortens the required extraction time, since in this case heating the water to the desired temperature is extremely fast.…”

Section: Hot-water Extractionmentioning

confidence: 99%

Chemical Pretreatments of Wood Chips Prior to Alkaline Pulping - A Review of Pretreatment Alternatives, Chemical Aspects of the Resulting Liquors, and Pulping Outcomes

Lehto

Alén

2015

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The chemical industry is being forced to evaluate new strategies for more effective utilization of renewable feedstocks to diminish the use of fossil resources. In this literature review, the integration of both acidic and alkaline pretreatment phases of hardwood and softwood chips with chemical pulping is discussed. Depending on the pretreatment conditions, high-volume sulfur-free fractions with varying chemical compositions can be produced. In case of acidic pretreatments, the major products include carbohydrates (mono-, oligo-, and polysaccharides), whereas under alkaline (i.e., aqueous NaOH) pretreatment conditions, the sulfur-free fractions of aliphatic carboxylic acids, lignin, and extractives are primarily obtained. All these fractions are potentially interesting groups of compounds and can be used in a number of applications. Finally, the effects of pretreatments on pulping are also considered. Although it is believed that there are important advantages to be gained by integrating this type of renewable raw material-based production, in particular, with kraft pulping, sulfur-free pulping methods such as soda-AQ and oxygen/alkali delignification processes are also briefly discussed.

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Isolation and characterization of galactoglucomannan from spruce ( Picea abies )

Cited by 225 publications

References 20 publications

Esterified Coconut Coir by Fatty Acid Chloride as Biosorbent in Oil Spill Removal

Esterified Coconut Coir by Fatty Acid Chloride as Biosorbent in Oil Spill Removal

Expression and Characterization of a Bifidobacterium adolescentis Beta-Mannanase Carrying Mannan-Binding and Cell Association Motifs

Chemical Pretreatments of Wood Chips Prior to Alkaline Pulping - A Review of Pretreatment Alternatives, Chemical Aspects of the Resulting Liquors, and Pulping Outcomes

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