An acetylated galactoglucomannan from Picea abies L. Karst

Capek, Peter; Alföldi, Juraj; Lišková, Desana

doi:10.1016/s0008-6215(02)00090-3

Cited by 67 publications

(41 citation statements)

References 15 publications

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“…[46] The acetylated mannan ( . [14,32,48] Here, through volume integration of the above contours, we report a ratio of 1.5 : 1 for loblolly pine.…”

Section: Naturally Acetylated Structuresmentioning

confidence: 82%

“…[14,32,33] Lignin assignments were confirmed with the NMR database of lignin and cell wall model compounds. [34] Assignment of several polysaccharide crosspeaks were not attempted here, but research is underway toward further assignments.…”

Section: Nmr Assignmentsmentioning

confidence: 91%

“…[12] To extract the naturally acetylated mannans, thermomechanical pulp of spruce (2% consistency) may be suspended in distilled water with stirring at 60 °C, [13] while spruce holocellulose may be extracted with boiling water to obtain the same. [14] Further isolation of holocellulose components involves alkaline extraction, but the remaining α-cellulose steadfastly retains some mannan and xylan.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of nonderivatized plant cell walls using high‐resolution solution‐state NMR spectroscopy

Yelle

Ralph

Frihart

2008

Magnetic Reson in Chemistry

167

179

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A recently described plant cell wall dissolution system has been modified to use perdeuterated solvents to allow direct in-NMR-tube dissolution and high-resolution solution-state NMR of the whole cell wall without derivatization. Finely ground cell wall material dissolves in a solvent system containing dimethylsulfoxide-d 6 and 1-methylimidazole-d 6 in a ratio of 4 : 1 (v/v), keeping wood component structures mainly intact in their near-native state. Two-dimensional NMR experiments, using gradient-HSQC (heteronuclear single quantum coherence) 1-bond 13 C-1 H correlation spectroscopy, on nonderivatized cell wall material from a representative gymnosperm Pinus taeda (loblolly pine), an angiosperm Populus tremuloides (quaking aspen), and a herbaceous plant Hibiscus cannabinus (kenaf) demonstrate the efficacy of the system. We describe a method to synthesize 1-methylimidazole-d 6 with a high degree of perdeuteration, thus allowing cell wall dissolution and NMR characterization of nonderivatized plant cell wall structures.

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“…[46] The acetylated mannan ( . [14,32,48] Here, through volume integration of the above contours, we report a ratio of 1.5 : 1 for loblolly pine.…”

Section: Naturally Acetylated Structuresmentioning

confidence: 82%

Section: Nmr Assignmentsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Characterization of nonderivatized plant cell walls using high‐resolution solution‐state NMR spectroscopy

Yelle

Ralph

Frihart

2008

Magnetic Reson in Chemistry

167

179

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“…The xylans here are mainly substituted with glucuronic acid or 4-O-methyl-glucuronic acid residues (Ebringerova and Heinze, 2000). In contrast, softwood (from conifers) contains mannans such as O-acetylated galactoglucomannans (Capek et al, 2002) as their main hemicellulose, although ample amounts of xylans are also present. Most importantly, the differences and ranges of wall components and their fine structures are also a result of the differences in tissues from which the feedstocks are derived (e.g.…”

Section: Not All Cell Walls Have the Same Polysaccharide Compositionmentioning

confidence: 99%

Cell‐wall carbohydrates and their modification as a resource for biofuels

Pauly¹,

Keegstra²

2008

The Plant Journal

734

510

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SummaryPlant cell walls represent the most abundant renewable resource on this planet. Despite their great abundance, only 2% of this resource is currently used by humans. Hence, research into the feasibility of using plant cell walls in the production of cost-effective biofuels is desirable. The main bottleneck for using wall materials is the recalcitrance of walls to efficient degradation into fermentable sugars. Manipulation of the wall polysaccharide biosynthetic machinery or addition of wall structure-altering agents should make it possible to tailor wall composition and architecture to enhance sugar yields upon wall digestion for biofuel fermentation. Study of the biosynthetic machinery and its regulation is still in its infancy and represents a major scientific and technical research challenge. Of course, any change in wall structure to accommodate cost-efficient biofuel production may have detrimental effects on plant growth and development due to the diverse roles of walls in the life of a plant. However, the diversity and abundance of wall structures present in the plant kingdom gives hope that this challenge can be met.

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“…At present, modification of hemicelluloses with unconventional functional groups is of increasing interest. Thus, various novel hemicellulosic derivatives with different degree of substitution (DS) were synthesized and characterized, e.g., crown ether containing hemicelluloses ethers [4,5,6] or crown ester containing hemicelluloses ester [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of carbamoylethyl hemicelluloses

et al. 2009

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Abstract:The reaction of hemicelluloses, isolated from wheat straw, with acrylamide in alkaline aqueous solution was investigated. The degree of substitution (DS, up to 0.65) of the products could be obtained by adjusting the molar ratios of reagent to xylose unit in hemicelluloses (1.0-10.0) and the molar ratios of catalyst to xylose unit in hemicelluloses (0.5-1.6). Changes in the structure of hemicelluloses were verified by FT-IR and 1 H and 13 C NMR spectroscopies. The results showed that carbamoylethyl groups surely were grafted onto the main chain of hemicelluloses. Moreover, it was also found that the saponification of carbamoylethyl groups to carboxyl groups occurred in alkaline medium. The behavior of modified hemicelluloses was monitored by means of thermo gravimetry (TG) and differential thermal analysis (TGA). It was found that the products had a lower thermal stability than the native hemicelluloses.

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An acetylated galactoglucomannan from Picea abies L. Karst

Cited by 67 publications

References 15 publications

Characterization of nonderivatized plant cell walls using high‐resolution solution‐state NMR spectroscopy

Characterization of nonderivatized plant cell walls using high‐resolution solution‐state NMR spectroscopy

Cell‐wall carbohydrates and their modification as a resource for biofuels

Preparation and characterization of carbamoylethyl hemicelluloses

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