Enhancing Antioxidant Performance of Lignin by Enzymatic Treatment with Laccase

Li, Zhili; Zhang, Jiubing; Li, Qin; Ge, Yuanyuan

doi:10.1021/acssuschemeng.7b04070

Cited by 111 publications

(51 citation statements)

References 30 publications

(43 reference statements)

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“…Many researchers are currently investigating these properties. For example, Li et al (2018) proposed improving the antioxidant properties of two lignins by enzymatic treatment with laccase. The obtained results showed that the enzymatically treated lignin with the highest Ph-OH content and lower M w value possessed the strongest antioxidant activity, which is higher than that of commercial antioxidants.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and structure characterization of polymeric nanoporous microspheres with lignin

et al. 2018

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Nanoporous microspheres with divinylbenzene (DVB), styrene (St), and lignin were synthesized by an emulsion-suspension polymerization method. Several types of lignins were used: (1) kraft lignin before (L-unmod) and after modification with methacryloyl chloride (L-Met) and (2) low-molecularweight kraft lignin unmodified (LWL-unmod) and modified with methacrylic anhydride (LWL-Met). LWL was prepared by ultrafiltration of industrial black liquor using a ceramic membrane with a molecular weight (Mw) cut-off of 5 kDa. The synthesis was optimized by addition of different amounts of lignins. The microsphere texture was characterized using low-temperature nitrogen adsorption and small angle X-ray scattering analyses. The microspheres were nano-and mesoporous with a specific surface area in the range of 0.1-409 m 2 /g. The morphology of the copolymers was studied using field emission scanning electron microscopy and atomic force microscopy. The thermal properties were studied using differential scanning calorimetry and thermogravimetric analysis methods. A significant difference in the microsphere roughness is affected by lignins due to the presence of lignin nanoparticles at the surface of the microspheres. Molecular modeling was used to predict the sorption properties of the copolymers affected by various fields around the particles. The particle size, polydispersity and zeta potential of the St ? DVB, L-Met ? St ? DVB and L-unmod ? St ? DVB samples were measured by dynamic light scattering. Additionally, the point of zero charge of the samples was determined using potentiometric titration. The materials studied have a great potential for sorption processes due to their developed porosity and the presence of a number of active surface functionalities.

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Section: Introductionmentioning

confidence: 99%

Synthesis and structure characterization of polymeric nanoporous microspheres with lignin

et al. 2018

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“…Both processes, lignin removal and modification, now aim at the production of either small compounds as novel chemical building blocks, or at the development of new biomass-based materials. Recent examples include the production of benzaldehyde compounds and vanillin from lignin [78], the development of lignin-based controlled-release fertilizers [79], and the improvement of antioxidant activity of lignin [80], but also the modification of pulp for wood fiber insulation boards manufacturing [81]. Indeed, recent patents regarding the use of laccases in the paper industry are mostly dedicated to the incremental improvements of the established processes either through the addition of chemical mediators or the improved laccase variants (CN108823177A, CN109098025A).…”

Section: Lignin Removal and Modificationmentioning

confidence: 99%

Applications of Microbial Laccases: Patent Review of the Past Decade (2009–2019)

et al. 2019

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There is a high number of well characterized, commercially available laccases with different redox potentials and low substrate specificity, which in turn makes them attractive for a vast array of biotechnological applications. Laccases operate as batteries, storing electrons from individual substrate oxidation reactions to reduce molecular oxygen, releasing water as the only by-product. Due to society’s increasing environmental awareness and the global intensification of bio-based economies, the biotechnological industry is also expanding. Enzymes such as laccases are seen as a better alternative for use in the wood, paper, textile, and food industries, and they are being applied as biocatalysts, biosensors, and biofuel cells. Almost 140 years from the first description of laccase, industrial implementations of these enzymes still remain scarce in comparison to their potential, which is mostly due to high production costs and the limited control of the enzymatic reaction side product(s). This review summarizes the laccase applications in the last decade, focusing on the published patents during this period.

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“…Abundant research has focused on lignin treat as heavy metal adsorbent, since it is abundance in nature, environmental friendly, thermal stability, and easy to access [108][109][110][111]. However, the research progress of ligninbased adsorbents is slow and the adsorption capacity is very low, for example, the heavy metals removal by lignin grafted polyacrylic acid is only 70.1 mg/g, 7.7 mg/g, and 5.3 mg/g for Cd 2+ , Co 2+ , and Hg 2+ , respectively [112,113].…”

Section: Lignin Modificationmentioning

confidence: 99%

Fractionational and structural characterization of lignin and its modification as biosorbents for efficient removal of chromium from wastewater: a review

Wang

Sun

2019

J Leather Sci Eng

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The removal of chromium (Cr) from wastewater by various adsorbents has been investigated. As compared with the commercial activated carbon, the biosorbents with inexpensive and high adsorption capacities are developed from lignocellulosic wastes. Lignin, existing in lignocellulosic biomass, is the second most abundant resource in nature. Recently, lignin-based bio-sorbents were served as an advanced novel material for the metal ions and dye adsorption from wastewater. It has showed several advantages in the wastewater treatments because of the lowcost, high adsorption capacity, easy recover, and possibility of metal recovery. In this review, the isolation of lignin from lignocellulosic biomass was summarized, and the structural characteristics of lignin were comparably analyzed. The modification of lignin was performed to obtain a large surface area, strong binding-site, and high and quick adsorption properties of lignin-based adsorption materials. The adsorption efficiency of Cr ions was found to be strongly dependent on the pH of the wastewater. To further illustrate the adsorption process, the structural changes and the interactions between the metal ions and the functional groups of the lignin-based biosorbents in the adsorption process should be further investigated. Once the cost-effective and high-efficiency modification techniques are developed, lignin-based adsorbents can be expected to be the most suitable alternatives for Cr ions removal from wastewater in industry.

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Enhancing Antioxidant Performance of Lignin by Enzymatic Treatment with Laccase

Cited by 111 publications

References 30 publications

Synthesis and structure characterization of polymeric nanoporous microspheres with lignin

Synthesis and structure characterization of polymeric nanoporous microspheres with lignin

Applications of Microbial Laccases: Patent Review of the Past Decade (2009–2019)

Fractionational and structural characterization of lignin and its modification as biosorbents for efficient removal of chromium from wastewater: a review

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