Lignins of herbaceous plants

Dalimova, G. N.; Abduazimov, Kh. A.

doi:10.1007/bf00629995

Cited by 15 publications

(13 citation statements)

References 32 publications

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“…The GC-MS analysis of the nitrobenzene oxidation products showed that lignin in each organ consisted of guaiacyl, syringyl, and p-hydroxyphenyl units (Table 2), consistent with the result of thioacidolysis. The ratios of syringaldehyde to vanillin (S/V), which indicate the ratios of syringyl to guaiacyl lignins, were 0.61 in the inner part and 0.79 in the outer part (Table 2); the higher S/V ratio in the outer than the inner part was consistent with the results of the Mäule reaction (Figure 1D (Jung and Vogel 1992), and 0.37-0.59 in Miscanthus (Sarkanen and Hergert 1971)], and similar to those in small gramineous plants [e.g., 0.48-0.89 in rice straw (Dalimova and Abduazimov 1994;Dzhumanova and Dalimova 2011), and 0.72-0.93 in wheat straw (Dalimova and Abduazimov 1994)]. …”

Section: Lignin Structures Of E Arundinaceussupporting

confidence: 85%

Characterization of lignocellulose of Erianthus arundinaceus in relation to enzymatic saccharification efficiency

Yamamura

Noda

Hattori

et al. 2013

Plant Biotechnology

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Lignin is a major component of the secondary cell walls of vascular plants, and an obstacle in the conversion of plant cell wall polysaccharides into biofuels. Erianthus spp. are large gramineous plants of interest as potential energy sources. However, lignocelluloses of Erianthus spp. have not been chemically characterized. In this study, we analysed lignins, related compounds, enzymatic saccharification efficiencies, and minerals in the ash of the inner and outer parts of the internode, leaf blade and leaf sheath of Erianthus arundinaceus. Lignins in four organs consisted of guaiacyl, syringyl, and p-hydroxyphenyl units. The ratios of syringyl to guaiacyl lignins and lignin contents ranged from 0.43 to 0.79 and 20 to 28%, respectively, with values highest in the outer part of the internode. The amounts of ferulic acid were similar (7.3-11.8 mg g −1 dry weight of cell-wall material) in all four organs, while there was more p-coumaric acid in the inner part of the internode (44.7 mg g −1 dry weight of cell-wall material) than in other organs (25.7-28.8 mg g −1 dry weight of cell-wall material). The enzymatic saccharification efficiency (24 h reaction time) of the leaf blade was 21.6%, while those of the other organs ranged from 10.0 to 15.2%. The leaf blade had the highest ash content (17.1%); the main inorganic element was silicon. This paper provides the first fundamental knowledge of E. arundinaceus lignins.

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Section: Lignin Structures Of E Arundinaceussupporting

confidence: 85%

Characterization of lignocellulose of Erianthus arundinaceus in relation to enzymatic saccharification efficiency

Yamamura

Noda

Hattori

et al. 2013

Plant Biotechnology

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“…The GC-MS analysis of the nitrobenzene oxidation products showed that lignin in each organ consisted of guaiacyl, syringyl, and p-hydroxyphenyl units (Table 2), consistent with the result of thioacidolysis. e ratios of syringaldehyde to vanillin (S/V), which indicate the ratios of syringyl to guaiacyl lignins, were 0.61 in the inner part and 0.79 in the outer part (Table 2); the higher S/V ratio in the outer than the inner part was consistent with the results of the Mäule reaction (Figure 1D, E; Abduazimov 1994, Dzhumanova andDalimova 2011), and 0.72-0.93 in wheat straw (Dalimova and Abduazimov 1994)]. …”

Section: Lignin Structures Of E Ravennaesupporting

confidence: 75%

Retraction: Characterization of lignocellulose of Erianthus ravennae in relation to enzymatic saccharification efficiency

Yamamura

Noda

Hattori

et al. 2012

Plant Biotechnology

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confidence: 69%

“…However, guaiacyl structures predominated in the oxidation products of natural lignin and rice-husk DLA. The observation of a rather significant quantity of p-hydroxybenzoic acid in the oxidation products of corn stems was a characteristic signature of this plant and reached 5-10%, in agreement with the literature on the content of esterified phenolcarboxylic acids in grasses [3].The ratio of syringaldehyde to vanillin (S/V) is given in many studies as an indicator of the degree of condensation of lignin preparations. For example, the ratio of syringyl and guaiacyl groups in mechanically milled lignin (MML) of wheatstraw (Triticum aestivum L.) internodes showed that the Maule color reaction [treatment of sections of plant material with KMnO 4 solution (1%) for 5 min and then HCl and NH 4 OH (a red color should appear for a positive reaction)] was negative for lignins with S/V < 2 [4].…”

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confidence: 55%

Nitrobenzene oxidation of lignins from several plants of the family Gramineae

Dzhumanova

Dalimova

2011

Chem Nat Compd

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It was found based on results from alkaline nitrobenzene oxidation of natural and isolated dioxane lignins from several plants of the family Gramineae such as rice husks, rice straw, and corn and sorghum stems that the studied lignins consisted of three types of structural units with the predominance of guaiacyl structures.Grasses (Gramineae Juss.) are distributed in nature on all continents, represent a significant part of the biomass of many biocommunities, and are considered one of the most widespread and useful plants for man. The main components of the cell wall, e.g., cellulose, carbohydrates, proteins, extractable substances, of many grasses have by now been investigated. One of the main components of grasses is lignin, the content of which in grasses reaches 15-28% and which is not yet fully studied. It is also known that high-molecular-weight compounds of plant xylem, cellulose and lignin, exhibit valuable properties and can be used in various economic sectors.We reported previously on the isolation of dioxane lignins (DLAs) from rice husk and straw and from corn and sorghum stems. These were characterized by determining the chemical composition and calculating the semi-empirical formula [1,2].The goal of our work was to study the structure of natural lignins and DLAs from rice husk and straw and corn and sorghum stems using alkaline nitrobenzene oxidation (NBO).The yields of NBO products from the studied samples were different for both natural lignins and DLAs isolated from each plant (Fig. 1).HPLC was used to analyze total oxidation products of natural lignins from the grasses ( Table 1). The analysis showed that aromatic aldehydes, ketones, and phenolcarboxylic acids belonging to three types of structural units (p-coumaryl, guaiacyl, and syringyl) were formed by NBO of lignins from the samples.A comparison of the ratio of guaiacyl, syringyl, and p-coumaryl structural units in the alkaline NBO products of natural lignins and DLAs from the studied plants found that syringyl structures predominated in the oxidation products of ricestraw DLA. This may have indicated a low degree of condensation in this lignin (Tables 1 and 2). However, guaiacyl structures predominated in the oxidation products of natural lignin and rice-husk DLA. The observation of a rather significant quantity of p-hydroxybenzoic acid in the oxidation products of corn stems was a characteristic signature of this plant and reached 5-10%, in agreement with the literature on the content of esterified phenolcarboxylic acids in grasses [3].The ratio of syringaldehyde to vanillin (S/V) is given in many studies as an indicator of the degree of condensation of lignin preparations. For example, the ratio of syringyl and guaiacyl groups in mechanically milled lignin (MML) of wheatstraw (Triticum aestivum L.) internodes showed that the Maule color reaction [treatment of sections of plant material with KMnO 4 solution (1%) for 5 min and then HCl and NH 4 OH (a red color should appear for a positive reaction)] was negative for lignins with S/V < 2 [4...

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Lignins of herbaceous plants

Cited by 15 publications

References 32 publications

Characterization of lignocellulose of Erianthus arundinaceus in relation to enzymatic saccharification efficiency

Characterization of lignocellulose of Erianthus arundinaceus in relation to enzymatic saccharification efficiency

Retraction: Characterization of lignocellulose of Erianthus ravennae in relation to enzymatic saccharification efficiency

Nitrobenzene oxidation of lignins from several plants of the family Gramineae

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