Investigation of the effects of different organosolv pulping methods on antioxidant capacity and extraction efficiency of lignin

Lü, Qi; Liu, Wenjun; Yang, Lei; Zu, Yuangang; Zu, Baishi; Zhu, Minghua; Zhang, Ying; Zhang, Xiunan; Zhang, Rongrui; Sun, Zhen; Huang, Jinming; Zhang, Xiaonan; Li, Wengang

doi:10.1016/j.foodchem.2011.07.116

Cited by 81 publications

(38 citation statements)

References 10 publications

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“…The decrease of the solution absorbance, due to proton-donating activity, was measured at 517 nm using a UV 2300 spectrometer (Shanghai Tianmei Science and Technology Corporation, China). The DPPH radical-scavenging activity was calculated according to a previous paper (Lu et al 2012).…”

Section: Chemical Analysis and Structural Characterizationmentioning

confidence: 99%

Alkaline and Organosolv Lignins from Furfural Residue: Structural Features and Antioxidant Activity

Sun¹,

Cao²,

Xu³

et al. 2013

BioResources

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Furfural residue (FR), composed mainly of cellulose and lignin, is an industrial waste produced during furfural manufacture. In this study, dioxane, alkali, ethanol, alkali-ethanol, and alkaline hydrogen peroxide (AHP) were used to extract lignins from FR. The structural features of these lignins obtained were characterized by sugar analysis, GPC, UV, FT-IR, and HSQC spectra. As compared to dioxane lignin (DL), other lignins showed lower molecular weights (M w ) owing to the partial cleavage of the linkages between lignin units. Results from HSQC spectra revealed that β-O-4' and β-5' were still the major linkages of the FR lignin. Moreover, p-coumaric and ferulic acids were released and coprecipitated in the lignin preparations extracted with alkali and AHP, whereas part of the esters in DL were preserved during the dioxane extraction. Antioxidant activity investigation indicated that the antioxidant property of the alkali and alkali-ethanol lignins was higher than that of the commercial antioxidant, butylated hydroxytoluene. Keywords INTRODUCTIONFurfural residue (FR), an industrial waste, is produced during the manufacture of furfural from corncob, during which hemicelluloses are hydrolyzed to produce the furfural by acid catalysis, while the residue (mainly cellulose and lignin) is usually burnt. It has been estimated that the annual production of FR is about 23 million tons . With the rapidly increasing demand for energy and the declining supply of fossil resources, bioconversion of FR into biofuels, such as bioethanol, has received much attention. Ethanol production from FR would not only reduce environmental pollution, but also efficiently use the corncob material. It has been reported that the furfural production process decreases the degree of polymerization of cellulose, which is beneficial for the enzymatic hydrolysis (Zhang et al. 2009). However, lignin plays a vital role as an inter-and intra-molecular glue, strengthening plant cell walls, which leads to its inability to undergo rapid biotransformation into useful biofuels (Elumalai et al. 2012). Therefore, pretreatment of FR before its biotransformation is needed. The treatment approach is achieved by fractionation of FR into cellulose and lignin with good selectivity and high yield. Thus FR can be fully exploited for the subsequent conversion into biofuels, commodities (i.e., alkali lignin, organosolv lignin, etc.), and other high value-added products.PEER-REVIEWED ARTICLE bioresources.com Sun et al. (2014). "Lignins from furfural residue," BioResources 9(1), 772-785. 773Lignin is an amorphous polymer consisting of phenylpropane units, and their precursors are three monolignols, namely p-coumaryl, coniferyl, and sinapyl alcohols (Terashima and Fukushima 1989). The respective aromatic constituents of these alcohols in the polymers are called p-hydroxyphenyl (H), guaiacyl (G), and syringyl (S) units (Buranov and Mazza 2008). During the lignification process, these monolignols form various interunit bonds, such as β- O-4′, α-O-4′, 4-O-5′, β-5′, β-1′...

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Section: Chemical Analysis and Structural Characterizationmentioning

confidence: 99%

Alkaline and Organosolv Lignins from Furfural Residue: Structural Features and Antioxidant Activity

Sun¹,

Cao²,

Xu³

et al. 2013

BioResources

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“…Furthermore, properties potentially interesting in high value applications, such as antimicrobial activity [12] or cytotoxic effects [13] have been shown. The antioxidant properties of lignins stem from their radical scavenging capacity [13][14][15][16][17], following the general mechanism of monomeric phenols. The hindered phenolic hydroxyl groups being part of the lignin structure act as proton donors and are able to stabilize the radical in the quinone resonance structure [16].…”

Section: Introductionmentioning

confidence: 99%

“…In general, radical scavenging activity of lignin is negatively influenced by increasing heterogeneity, dispersity, molecular weight average and carbohydrate admixtures [13,15,16]. Lignins extracted in sodium hydroxide aqueous medium (alkali lignins) have been shown to have higher activity than other types of lignins, such as lignosulfonates, Kraft, or steam explosion lignin, with a radical scavenging activity similar to that of epicatechin, used as a reference antioxidant [14,17]. Alkali lignins contain a fraction of free phenolic monomers, mainly ferulic and p-coumaric acids [8], likely to account for this high radical scavenging activity.…”

Section: Introductionmentioning

confidence: 99%

Potential of Lignins as Antioxidant Additive in Active Biodegradable Packaging Materials

et al. 2013

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Abstract Due to their polyphenolic structure lignins bear a number of interesting functional properties, such as antioxidant activity. Natural antioxidants are very much looked for in the aim of protection of light or oxygen sensitive goods and are being used in active packaging. Poly(lactide) (PLA)-lignin films were prepared by twin screw extrusion followed by thermo-compression using two different commercial sources of alkali lignins obtained from gramineous plants. A good dispersion of lignin in the matrix was observed. Mechanical properties of the compounded material were merely diminished and oxygen barrier properties slightly enhanced. The chromatographic study of the lignins revealed that the low molecular weight fraction of both lignins increased during the polymer processing. The migration of low molecular weight compounds in an ethanol/water solution simulating fatty foodstuff was performed and the antioxidant activity of the extract was analysed. It was found that the activity increases with increasing severity of the heat treatment because of the generation of free phenolic monomers during processing. These results open an interesting way for application of lignins as an active compound in packaging materials. Lignins do not impair the mechanical and barrier performance of the polymer and the plastics processing even allows for the generation of active substances.

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“…These processes have several advantages such as avoiding the use of sulfur-containing reagents, the option to use the process with both woody and nonwoody feedstock, a higher yield for equal residual lignin content, and the efficient recovery of solvents from the process. Different organic solvents, such as ethanol, acetic acid, esters, soda-amine and ethanolalkali (Sahin and Young 2008;Sarkanen 1990;Shatalov and Pereira 2005;Vázquez et al 1999), have been studied on a laboratorial scale (Jiménez et al 2008;Lu et al 2012;González et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Grinding process for the production of nanofibrillated cellulose based on unbleached and bleached bamboo organosolv pulp

et al. 2016

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Nanofibrillated cellulose (NFC) is a type of nanomaterial based on renewable resources and produced by mechanical disintegration without chemicals. NFC is a potential reinforcing material with a high surface area and high aspect ratio, both of which increase reinforcement on the nanoscale. The raw materials used were unbleached and bleached bamboo organosolv pulp. Organosolv pulping is a cleaner process than other industrial methods (i.e. Kraft process), as it uses organic solvents during cooking and provides easy solvent recovery at the end of the process. The NFC was produced by treating unbleached and bleached bamboo organosolv pulps for 5, 10, 15 and 20 nanofibrillation cycles using the grinding method. Chemical, physical and mechanical tests were performed to determine the optimal condition for nanofibrillation. The delamination of the S2 layer of the fibers during nanofibrillation contributed to the partial removal of amorphous components (mainly lignin), which have low polarity and improved the adhesion of the fibers, particularly the unbleached cellulose. The transverse modulus of elasticity of the unbleached NFC was highest after 10 nanofibrillation cycles. Further treatment cycles decreased the modulus due to the mechanical degradation of the fibers. The unbleached NFC produced by 10 cycles have a greater transverse modulus of elasticity, the crystallite size showed increase with the nanofibrillation, and after 5 nanofibrillation cycles, no differences are observed in the morphology of the fibers.Viviane daC. Correia (&) Á V. dos Santos Á

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Investigation of the effects of different organosolv pulping methods on antioxidant capacity and extraction efficiency of lignin

Cited by 81 publications

References 10 publications

Alkaline and Organosolv Lignins from Furfural Residue: Structural Features and Antioxidant Activity

Alkaline and Organosolv Lignins from Furfural Residue: Structural Features and Antioxidant Activity

Potential of Lignins as Antioxidant Additive in Active Biodegradable Packaging Materials

Grinding process for the production of nanofibrillated cellulose based on unbleached and bleached bamboo organosolv pulp

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