Lignin-carbohydrate complexes in forages: structure and consequences in the ruminal degradation of cell-wall carbohydrates

Cornu, A.; Besle, JM; Mosoni, Pascale; Grenet, Élisabeth

doi:10.1051/rnd:19940501

Cited by 49 publications

(24 citation statements)

References 60 publications

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“…Wheat straw lignin is known to contain arabinoxylans as the main carbohydrate impurities with lignin being linked with arabinose side chains of xylan by ether bonds (Sun et al, 1997). The majority of these ether linkages occur at the a-position of the propanoid chains of lignin as initially suggested by their possible cleavage under acidic conditions (Mc Donough, 1993;Cornu et al, 1994;Lawther et al, 1996) and later confirmed by NMR and xylanase-based fractionation (Barakat et al, 2007). Applying MW instead of CH decreased significantly the xylose content of the lignin but had almost no effect on the arabinose content.…”

Section: Characterization Of Extracted Ligninsmentioning

confidence: 99%

Microwave-assisted extraction of lignin from triticale straw: Optimization and microwave effects

Monteil-Rivera

Huang

Paquet

et al. 2012

Bioresource Technology

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Presently lignin is used as fuel but recent interests in biomaterials encourage the use of this polymer as a renewable feedstock in manufacturing. The present study was undertaken to explore the potential applicability of microwaves to isolate lignin from agricultural residues. A central composite design (CCD) was used to optimize the processing conditions for the microwave (MW)-assisted extraction of lignin from triticale straw. Maximal lignin yield (91%) was found when using 92% EtOH, 0.64 N H 2 SO 4 , and 148°C. The yield and chemical structure of MW-extracted lignin were compared to those of lignin extracted with conventional heating. Under similar conditions, MW irradiation led to higher lignin yields, lignins of lower sugar content, and lignins of smaller molecular weights. Except for these differences the lignins resulting from both types of heating exhibited comparable chemical structures. The present findings should provide a clean source of lignin for potential testing in manufacturing of biomaterials.Crown

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Section: Characterization Of Extracted Ligninsmentioning

confidence: 99%

Microwave-assisted extraction of lignin from triticale straw: Optimization and microwave effects

Monteil-Rivera

Huang

Paquet

et al. 2012

Bioresource Technology

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“…In grasses, ferulic and pcoumaric acids are esterified to hemicellulose and lignin (Jeffries 1990;Mueller-Harvey & Hartley 1986). Xylans appear to be a major interface between lignin and other carbohydrate components (Cornu et al 1994;Jeffries 1990). Ferulic acid anchors hydrophobic lignins to hydrophilic polysaccharides via alkali-sensitive ester bonds.…”

Section: Tertiary Architecturementioning

confidence: 99%

“…Lignin-carbohydrate complexes (LCCs) are recognized as key structures determining forage digestibility (Hatfield et al 1999). These intricate associations between cellulose, hemicellulose and lignin prevent polymer hydrolyzing enzymes access to its substrates (Cornu et al 1994).…”

Section: Enzyme Access To Substratementioning

confidence: 99%

“…Toxicity of lignin-carbohydrate complexes (LCCs) to rumen microflora has been debated, but in vivo toxicity is thought to be insignificant due to dilution and rapid detoxification by the microflora (Cornu et al 1994;Wilson & Mertens 1995). However, the toxic effects of LCCs at biodegradation foci remain largely unknown.…”

Section: Toxicity Of Lignin-carbohydrate Complexes and Lignocellulosementioning

confidence: 99%

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Lignocellulose biodegradation: Fundamentals and applications

Malherbe

Cloete

2002

Rev Environ Sci Biotechnol

405

163

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“…It increased arabinose degradability by favouring microbial attack, whereas it acted on UAs mostly by solubilising the related polymers. This differential effect of ammonia treatment on monomeric compounds might be related to the cell wall structural heterogeneity at the molecular level and the type and number of ester linkages differing between hemicelluloses (Cornu et al, 1994). It might also stem from differences in chemical composition and accessibility between plant tissues and parts (Bourquin and Fahey, 1994).…”

Section: Discussionmentioning

confidence: 99%

Rumen digestion of rice straw structural polysaccharides: effect of ammonia treatment and lucerne extract supplementation in vitro

Agbagla-Dohnani

Cornu

Broudiscou

2012

animal

Self Cite

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The combined effects of lucerne (Medicago sativaL.) extract supplementation and ammonia treatment of rice straw (Oryza sativa, variety Thaibonnet) on the ruminal digestion of cell wall components were investigated in six continuous culture systems using a randomised complete block design. Data were fitted to second-order polynomial models. Untreated rice straw had higher contents of ash-free cell wall residues (CWR; 763v.687 g/kg dry matter (DM)) and non-cellulosic sugars (191v.166 g/kg DM) than treated rice straw. Ammoniation preferentially removed xylose, which resulted in a lower xylose-to-arabinose ratio (5.1v.5.8). In absence of lucerne supplementation and ammoniation, degradability coefficients were 0.54, 0.46, 0.58, 0.54, 0.42 and 0.60 for cellulose–glucose, xylose, arabinose, galactose, mannose and uronic acids, respectively. Both factors had significant effects on the microbial degradation of structural polysaccharides. With lucerne extract at an optimal level, ammonia treatment increased ash-free cell wall degradation by more than 10%. The degradability coefficients were increased by ammoniation without any significant interaction with lucerne extract, except for glucose, whose degradability was mostly influenced by lucerne extract in a curvilinear way. The comparison of regression coefficients in cell wall and CWR models suggested that ammoniation improved the degradabilities of xylose, galactose and mannose by partly solubilising the corresponding hemicelluloses and by improving the susceptibility of the remaining fraction to microbial attack, whereas it increased the degradability of arabinose only by favouring microbial attack.

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Lignin-carbohydrate complexes in forages: structure and consequences in the ruminal degradation of cell-wall carbohydrates

Cited by 49 publications

References 60 publications

Microwave-assisted extraction of lignin from triticale straw: Optimization and microwave effects

Microwave-assisted extraction of lignin from triticale straw: Optimization and microwave effects

Lignocellulose biodegradation: Fundamentals and applications

Rumen digestion of rice straw structural polysaccharides: effect of ammonia treatment and lucerne extract supplementation in vitro

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