Structural Characterization of Lignin Isolated from Wheat-Straw during the Alkali Cooking Process

Tian, Xiaojun; Wang, Bing; Wang, Bin; Li, Jinpeng; Chen, Kefu

doi:10.15376/biores.12.2.2407-2420

Cited by 7 publications

(7 citation statements)

References 28 publications

(34 reference statements)

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“…Lignin was extracted from the black liquor of wheat straw. The relevant data of the lignin and a more detailed description of the pulping conditions are given in the authors' previous work (Tian et al 2017).…”

Section: Methodsmentioning

confidence: 99%

The use of lignin as cross-linker for polyurethane foam for potential application in adsorbing materials

Wang

Chen

et al. 2017

BioRes

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Lignin was extracted from wheat straw and used for its crosslinking function in the synthesis of polyurethane foam (PUF). The effects of lignin’s addition on the cross-linking structure and macroscopic properties of the PUFs were investigated. A morphological examination, Fourier transform infrared (FT-IR) spectroscopy, and thermogravimetric analysis (TGA) were conducted to measure the performance of the polyurethanes. Kinetic models were simulated to analyze the oily solvent adsorption mechanism of the polyurethane. The results showed that an increase in the cross-linking density was conducive to an improvement of the physical properties of the polyurethane. Moreover, the process of oily solvent adsorption was in accordance with the quasi-second-order kinetic model. Both physical and chemical adsorption occurred during the adsorption process. This work demonstrated a highly effective method for imparting PUFs with an excellent performance and proper lignin content.

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Section: Methodsmentioning

confidence: 99%

The use of lignin as cross-linker for polyurethane foam for potential application in adsorbing materials

Wang

Chen

et al. 2017

BioRes

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“…1:0.7 [ 25 , 27 ]. Wheat and rye lignin typically consist of a small amount of H and ~1:1 in S:G unit ratio [ 28 ]. Previous studies have shown that it has a lower purity and a broader molecular weight distribution than wood lignin [ 25–27 ].…”

Section: Introductionmentioning

confidence: 99%

Spheronized drug microcarrier system from canola straw lignin

Zhang

Svärd

Edlund

2023

Science and Technology of Advanced Materials

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Inhomogeneous lignin from a canola (rapeseed) straw was isolated and valorized as regularly shaped spherical microparticles for drug delivery formulations. Lignin with a purity of 83% and broad molecular weight distribution (Ð > 5.0) was extracted by alkali pulping and acetylated to increase spheronization ability. Lignins with high degrees of acetylation (0.76 and 0.89) were successfully assembled into microparticles with uniform sizes (approximately 2 μm) and smooth spherical surfaces via solvent–antisolvent precipitation. Hydrophobic coumarin 153 and positively charged ciprofloxacin were used as model drugs to assess the encapsulation and release performance of lignin microparticles. Highly acetylated lignin microparticles displayed encapsulation efficiencies of 89.6% for coumarin 153% and 90.6% for ciprofloxacin. Scanning electron microscope images showed that coumarin 153 was encapsulated in the hydrophobic core, while ciprofloxacin was adsorbed on the less hydrophobic shell. The synthesis of lignin microcarriers not only provides a facile approach to utilizing waste canola straw lignin for drug delivery matrices but also has the potential to serve as an alternative lignin powder feedstock for bio-based materials.

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“…The wheat bran predominantly contains non-starch polysaccharides (38%), starch (19%), proteins (18%), and lignin (6%), which is mainly a (G-S)-type (i.e., a ratio S:G:H of 0.9:1.0:0.19). , Noteworthy, ferulic acid is the most abundant phenolic compound in wheat bran lignin followed by p -coumaric acid: figures of 9.7 ± 0.4 and 2.6 ± 0.5 mg/g wheat bran have been reported . Ferulic acid is linked to arabinoxylans through ester links: in the context, to develop a sustainable process for its release, the enzymatic hydrolysis of ester bonds is particularly attractive because of its environmentally friendliness and energy efficiency .…”

Section: Resultsmentioning

confidence: 99%

Whole-Cell Bioconversion of Renewable Biomasses-Related Aromatics to cis,cis-Muconic Acid

Molinari

Pollegioni

Rosini

2023

ACS Sustainable Chem. Eng.

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Lignin and wheat bran represent renewable feedstocks for generation of useful and value-added compounds such as vanillin (a popular flavoring agent) and cis,cis-muconic acid (ccMA, a building block for the synthesis of plastic materials). In the present work, we report on the setup of an efficient and green process for producing such valuable compounds based on (a) the optimization of the extraction procedures for vanillin from lignin and ferulic acid from wheat bran and (b) the genetic engineering of an Escherichia coli strain with up to three plasmids differing in copy numbers to modulate the expression of up to seven recombinant enzymes. In detail, we used two sequential reactions catalyzed by the decarboxylase Fdc and the dioxygenase Ado to convert wheat bran-derived ferulic acid into vanillin: nature-identical vanillin was produced in one pot with a >85% yield in 20 h. Next, the dehydrogenase LigV, the demethylase VanAB, the decarboxylase AroY, and the dioxygenase C12O converted lignin-derived vanillin into ccMA with a >95% conversion yield and a productivity of 4.2 mg of ccMA/g of Kraft lignin in 30 min. Finally, when the optimized E. coli strain expressing all the abovementioned enzymes was used, ccMA was produced with a >95% conversion yield starting from ferulic acid in 10 h following product isolation, corresponding to 0.73 g of ccMA/g of ferulic acid, 1.4 g of ccMA/L, and 2.2 g of ccMA/g of wheat bran biomass. The optimized whole-cell system represents a sustainable and cost-competitive process for producing high value-added products from renewable resources.

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Structural Characterization of Lignin Isolated from Wheat-Straw during the Alkali Cooking Process

Cited by 7 publications

References 28 publications

The use of lignin as cross-linker for polyurethane foam for potential application in adsorbing materials

The use of lignin as cross-linker for polyurethane foam for potential application in adsorbing materials

Spheronized drug microcarrier system from canola straw lignin

Whole-Cell Bioconversion of Renewable Biomasses-Related Aromatics to cis,cis-Muconic Acid

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