نتایج جستجو برای: lignin

تعداد نتایج: 11241  

2018
Lan Yao Chang Geun Yoo Xianzhi Meng Mi Li Yunqiao Pu Arthur J. Ragauskas Haitao Yang

Background: Cellulase adsorption to lignin is considered a cost barrier for bioethanol production; however, its detailed association mechanism is still not fully understood. In this study, two natural poplar variants with high and low sugar release performance were selected as the low and high recalcitrant raw materials (named L and H, respectively). Three different lignin fractions were extrac...

2017
Yinjie Wang Liping Sheng Huanru Zhang Xinping Du Cong An Xiaolong Xia Fadi Chen Jiafu Jiang Sumei Chen

The gene encoding the MYB (v-myb avian myeloblastosis vira l oncogene homolog) transcription factor CmMYB19 was isolated from chrysanthemum. It encodes a 200 amino acid protein and belongs to the R2R3-MYB subfamily. CmMYB19 was not transcriptionally activated in yeast, while a transient expression experiment conducted in onion epidermal cells suggested that the CmMYB19 product localized to the ...

2002

Lignin, a complex phenolic polymer, is important for mechanical support, water transport, and defense in vaseular plants. Compressive strength and hydrophobicity of xylem cell walls are imparted by the lignin polymer, which is deposited during the terminal differentiation of tracheids and other cell types. The resistance of xylem to compressive stresses imposed by water transport and by the mas...

2015
Diwakar Rana Dhrubojyoti D. Laskar Keerthi Srinivas Birgitte K. Ahring

Background: In biorefineries, various pretreatments traditionally employ hazardous chemicals (ammonia, sulfuric acid, sulfite, etc.) for opening the softwood structure and to facilitate easy accessibility of the cellulose for further downstream processing. The resultant lignin (known as technical lignin) after extraction of the carbohydrate fraction as sugars has been either burned as fuel or u...

Journal: :The Biochemical journal 1988
M L Niku-Paavola E Karhunen P Salola V Raunio

One oxidase (EC 1.10.3.2) and three lignin peroxidases (EC 1.11.1.-) were purified from the culture liquid of the white-rot fungus Phlebia radiata Fr. All the enzymes were glycoproteins. The oxidase had Mr 64,000 and the lignin peroxidases I, II and III had Mr values 42,000, 45,000 and 44,000 respectively. The lignin peroxidases were found to share common antigenic determinants: lignin peroxida...

2015
Shengming Zhang Yan Zhang Liang Liu Guizhen Fang

Organosolv lignin degradation was carried out through hydrogenolysis routes with SO4/ZrO2 as the catalyst. Structural characterization and antioxidant activity of organosolv lignin samples were investigated; the antioxidant activity of the organosolv lignin was compared with that of soda lignin. Results showed that the active functional groups contents of organosolv lignin were increased, and t...

2016
Ray Smith

Lignin is an essential structural component of all land plants. It fills spaces in the cell wall between cellulose, hemicellulose, and pectin. Lignin provides the strength to plants from giant Sequoia trees to alfalfa growing in hay fields. A good analogy is that lignin is like the steel reinforcing rods in concrete. Life on earth would not be possible without lignin to allow plants to grow upr...

2018
Jason M. Lang Umesh M. Shrestha Mark Dadmun

This work increases our understanding of the effect of plant source on the mechanical and morphological properties of lignin-based polyurethanes (PUs). Lignin is a polymer that is synthesized inside the plant cell wall and can be used as a polyol to synthesize PUs. The specific aromatic structure of the lignin is heavily reliant on the plant source from which it is extracted. These results show...

Journal: :Bioresource technology 2009
Jae-Jung Ko Yoshihisa Shimizu Kazuhiro Ikeda Seog-Ku Kim Chul-Hwi Park Saburo Matsui

This study is designed to investigate the biodegradation of high molecular weight (HMW) lignin under sulfate reducing conditions. With a continuously mesophilic operated reactor in the presence of co-substrates of cellulose, the changes in HMW lignin concentration and chemical structure were analyzed. The acid precipitable polymeric lignin (APPL) and lignin monomers, which are known as degradat...

Journal: :research journal of pharmacognosy 0
s. hemmati department of pharmaceutical biotechnology, school of pharmacy, shiraz university of medical sciences, shiraz, iran. pharmaceutical sciences research center, shiraz university of medical sciences, shiraz, iran h. seradj department of pharmacognosy, school of pharmacy, shiraz university of medical sciences, shiraz, iran. n. mehrabi department of pharmaceutical biotechnology, school of pharmacy, shiraz university of medical sciences, shiraz, iran.

background and objectives: residues of medicinal plants after extraction and weeds are suitable candidates for bioethanol production. significant barriers exist to make the conversion of lignocellulosic feedstock to biofuel cost effective and environmentally friendly; one of which is the lignin polymer. brassicaceae family is one of the potential targets for biofuel production. the structural c...

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