Structural elucidation and antioxidant activity of lignin isolated from rice straw and alkali‑oxygen black liquor

Jiang, Bo; Zhang, Yu; Gu, Lei; Wu, Wenjuan; Zhao, Huifang; Jin, Yongcan

doi:10.1016/j.ijbiomac.2018.05.063

Cited by 69 publications

(34 citation statements)

References 30 publications

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“…Hence, scavenging these radicals in vivo became a hot topic in relevant medical sciences [48]. To explore whether the components in prehydrolyzate have any additionally beneficial antioxidant capacity, S-L and XOS were analyzed in radical-scavenging assays using DPPH and hydroxyl radicals, which has been considered as the conventional substrates to evaluate the antioxidant capacity [26, 45]. Assay results showed that the antioxidant activities of S-L and XOS were both dose-dependent behavior at concentrations from 0.2–1.2 g/L and 0.5–3 g/L, respectively (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, the XOS from biomass have shown the ability to scavenge free radicals [25]. The lignin has also been verified as the polymer that has the biological properties such as antimicrobial, anti-inflammatory activity, antioxidant for inhibiting oxidation rate of a free radical [26]. Although the XOS and lignin from different biomass have been verified to be applied in the biological filed, limited work was carried out to evaluate if the isolated XOS and solubilized lignin in the prehydrozate by PS-DVB resin possess prebiotics to stimulate the growth of intestinal bacteria and in vitro antioxidant activity.…”

Section: Introductionmentioning

confidence: 99%

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A sustainable process for procuring biologically active fractions of high-purity xylooligosaccharides and water-soluble lignin from Moso bamboo prehydrolyzate

Huang

Wang

Liang³

et al. 2019

Biotechnol Biofuels

200

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Background Prehydrolyzate, which is from the prehydrolysis process in dissolving pulps industry, contains various sugar-derived and lignin compounds such as xylooligosaccharides (XOS), gluco-oligosaccharides, xylose, glucose, and soluble lignin (S-L). The XOS has several beneficial effects on human physiology. XOS and S-L in prehydrolyzate are difficult to efficiently fractionate due to their similar molecular weights and water solubility. In this work, we proposed a sustainable and green process using polystyrene divinylbenzene (PS-DVB) resin to simultaneously separate and recover XOS and S-L. Enzymatic hydrolysis with endo-1,4-β-xylanase and fermentation with P. stipites were sequentially applied to purify XOS to minimize xylose content as well as amplify contents of xylobiose and xylotriose. In addition, 2D-HSQC NMR was used to analyze the structural characteristics of XOS and S-L. Furthermore, the biological abilities of antioxidants and prebiotics of these fractions were investigated by scavenging radicals and cultivating intestinally beneficial bacterias, respectively. Results Results showed that PS-DVB resin could simultaneously separate XOS and solubilized lignin with excellent yields of 93.2% and 85.3%, respectively. The obtained XOS after being purified by enzymatic hydrolysis and fermentation contained 57.7% of xylobiose and xylotriose. 10.4% amount of inherent xylan was found in the S-L fraction obtained by PS-DVB resin separation. 2D-HSQC NMR revealed that lignin carbohydrate complexes existed in both XOS and S-L as covalent linkages between lignin and 4- O -methylglucuronoarabinoxylan. The biological application results showed that the antioxidant capacity of S-L was stronger than XOS, while XOS was superior in promoting growth of intestinal Bifidobacteria adolescentis and stimulating production of short-chain fatty acids by Lactobacillus acidophilus. Conclusions The proposed strategy of sequentially combining hydrophobic resin separation, enzymatic hydrolysis, and fermentation was successfully demonstrated and resulted in simultaneous production of high-quality XOS and solubilized lignin. These biomass-derived products in prehydrolyzate can be regarded as value-adding prebiotics and antioxidants. Electronic supplementary material The online version of this article (10.1186/s13068-019-1527-3) contains supplementary material, which is available to authorized users.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A sustainable process for procuring biologically active fractions of high-purity xylooligosaccharides and water-soluble lignin from Moso bamboo prehydrolyzate

Huang

Wang

Liang³

et al. 2019

Biotechnol Biofuels

200

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“…nanoparticles [39]. Many recent researches reported that lignin showed antibacterial properties in biocomposites [40][41][42]. The antibacterial activity of NAL redistributed filter paper was assessed in this work.…”

Section: Antibacterial Activity Of Deposited Papermentioning

confidence: 99%

Lignin Redistribution for Enhancing Barrier Properties of Cellulose-Based Materials

et al. 2019

Self Cite

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Renewable cellulose-based materials have gained increasing interest in food packaging because of its favorable biodegradability and biocompatibility, whereas the barrier properties of hydrophilic and porous fibers are inadequate for most applications. Exploration of lignin redistribution for enhancing barrier properties of paper packaging material was carried out in this work. The redistribution of nanolized alkali lignin on paper surface showed excellent water, grease, and water vapor barrier. It provided persisted water (contact angle decrease rate at 0.05°/s) and grease (stained area undetectable at 72 h) resistance under long-term moisture or oil direct contact conditions, which also inhibited the bacterial growth to certain degree. Tough water vapor transmission rate can be lowered 82% from 528 to 97 g/m2/d by lignin redistribution. The result suggests that alkali lignin, with multiple barrier properties, has great potential in bio-based application considering the biodegradability, biocompatibility, and recyclability.

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“…Antioxidant evaluation (DPPH• and ABTS• methods) showed lignin from BL had a better radical-scavenging ability than RSE, which was due to the release of p-hydroxyphenyl units by rice straw alkali oxygen cooking. This process caused the destruction of tricin [70]. Lignin and phenolics could also be extracted from milled rice straw by hydrothermal treatment (210°C) to release cellulosic components, delignification (ethanol/water 60.5%, 130°C) to fractionate the lignocellulosic biomass and separation (nanofiltration cutoff 280 Da) to isolate the polyphenols [71].…”

Section: Ligninmentioning

confidence: 99%

“…Py/GC/MS analysis showed the presence of 17 phenolic compounds derived from guaiacyl 72, syringyl 68, and p-hydroxyphenyl 70 units in ratios of 65.09, 23.36, and 11.5%, respectively, the main compounds being Phenol 2-methoxy (guaiacol) 76, phenol 2-methoxy-4-vinyl (4-vinylguaiacol) 77, and 2,6-dimethoxy Figure 6. Residues identified in lignin from rice straw [70].…”

Section: Condensed A-and B-type Condensed Tannins A-type C4-c8 Couplmentioning

confidence: 99%

Antioxidant Compounds from Agro-Industrial Residue

Hernández-Carlos¹,

Santos-Sánchez²,

Salas-Coronado³

et al. 2019

Antioxidants

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Agro-industrial residues are a potential source of antioxidant compounds, which in general are phenolic compounds with a large chemical variability. The structure and the complexity of the phenolic compounds (polyphenols) determine their antioxidant capacity, pretreatments, and extraction methods. This chapter gives an overview of the chemical complexity of the phenolic compounds found in extractable and non-extractable fractions of agro-industrial residues, and representative compounds that are present in such residues are shown. Moreover, extraction methods described in this review showed the use of nonconventional technologies and chemical, enzymatic, or thermic treatments, useful to transform non-extractable polyphenols (NEP) to extractable polyphenol (EP) and then apply the EP extraction methods and recover antioxidants.

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Structural elucidation and antioxidant activity of lignin isolated from rice straw and alkali‑oxygen black liquor

Cited by 69 publications

References 30 publications

A sustainable process for procuring biologically active fractions of high-purity xylooligosaccharides and water-soluble lignin from Moso bamboo prehydrolyzate

A sustainable process for procuring biologically active fractions of high-purity xylooligosaccharides and water-soluble lignin from Moso bamboo prehydrolyzate

Lignin Redistribution for Enhancing Barrier Properties of Cellulose-Based Materials

Antioxidant Compounds from Agro-Industrial Residue

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