Cellulase Adsorption and Reactivity on a Cellulose Surface from Flow Ellipsometry

2012 ◽  
Vol 51 (35) ◽  
pp. 11389-11400 ◽  
Author(s):  
S. A. Maurer ◽  
C. N. Bedbrook ◽  
C. J. Radke
Keyword(s):  
Cellulase Adsorption ◽  
Cellulose Surface

scholarly journals Effects of Amino Acid Side-Chain Length and Chemical Structure on Anionic Polyglutamic and Polyaspartic Acid Cellulose-Based Polyelectrolyte Brushes

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1789
Author(s):  
Dmitry Tolmachev ◽  
George Mamistvalov ◽  
Natalia Lukasheva ◽  
Sergey Larin ◽  
Mikko Karttunen
Keyword(s):  
Glutamic Acid ◽  
Chain Length ◽  
Chemical Structure ◽  
Side Chain ◽  
Side Chains ◽  
Side Chain Length ◽  
Polyelectrolyte Brushes ◽  
Grafting Density ◽  
The Difference ◽  
Cellulose Surface

We used atomistic molecular dynamics (MD) simulations to study polyelectrolyte brushes based on anionic α,L-glutamic acid and α,L-aspartic acid grafted on cellulose in the presence of divalent CaCl2 salt at different concentrations. The motivation is to search for ways to control properties such as sorption capacity and the structural response of the brush to multivalent salts. For this detailed understanding of the role of side-chain length, the chemical structure and their interplay are required. It was found that in the case of glutamic acid oligomers, the longer side chains facilitate attractive interactions with the cellulose surface, which forces the grafted chains to lie down on the surface. The additional methylene group in the side chain enables side-chain rotation, enhancing this effect. On the other hand, the shorter and more restricted side chains of aspartic acid oligomers prevent attractive interactions to a large degree and push the grafted chains away from the surface. The difference in side-chain length also leads to differences in other properties of the brush in divalent salt solutions. At a low grafting density, the longer side chains of glutamic acid allow the adsorbed cations to be spatially distributed inside the brush resulting in a charge inversion. With an increase in grafting density, the difference in the total charge of the aspartic and glutamine brushes disappears, but new structural features appear. The longer sides allow for ion bridging between the grafted chains and the cellulose surface without a significant change in main-chain conformation. This leads to the brush structure being less sensitive to changes in salt concentration.

Does the cellulose-binding module move on the cellulose surface?

Cellulose ◽  
2009 ◽  
Vol 16 (4) ◽  
pp. 587-597 ◽  
Author(s):  
Yu-San Liu ◽  
Yining Zeng ◽  
Yonghua Luo ◽  
Qi Xu ◽  
Michael E. Himmel ◽  
...  
Keyword(s):  
Cellulose Binding Module ◽  
Cellulose Binding ◽  
Cellulose Surface

Cellulose Electroactive Paper (EAPap): The Potential for a Novel Electronic Material

2008 ◽  
Vol 1129 ◽  
Author(s):  
Joo-Hyung Kim ◽  
Kwangsun Kang ◽  
Sungryul Yun ◽  
Sangyeul Yang ◽  
Min-Hee Lee ◽  
...  
Keyword(s):  
Electronic Material ◽  
Mechanical Performance ◽  
Electronic Components ◽  
Electromechanical Properties ◽  
Actuation Mechanism ◽  
Mechanical Sensors ◽  
Electronic Elements ◽  
Stretching Ratio ◽  
Cellulose Surface ◽  
Quality Metal

AbstractCellulose electro-active paper (EAPap) has attracted much attention as a new smart electronic material to be utilized as mechanical sensors, bio compatible applications and wireless communications. The thin EAPap film has many advantages such as lightweight, flexible, dryness, biodegradable, easy to chemically modify, cheap and abundance. Also EAPap film has a good reversibility for mechanical performance, such as bending movement, under electric field. The main actuation mechanism governed by piezoelectric property can be modulated by material direction and stretching ratio during process. In this paper we present the overview as well as fabrication process of cellulose EAPap as a novel smart material. Also we propose the method to enhance the piezoelectricity, its mechanical and electromechanical properties. In addition, the fabrication of high quality metal patterns with Schottky diode on the cellulose surface is an initiating stage for the integration of the EAPap actuator and electronic components. The integration of flexible actuator and electronic elements has huge potential application including flying magic carpets, microwave driven flying insets and micro-robots and smart wall papers.

scholarly journals Cellulose as an inert matrix for presenting cytokines to target cells: production and properties of a stem cell factor–cellulose-binding domain fusion protein

1999 ◽  
Vol 339 (2) ◽  
pp. 429-434
Author(s):  
J. Greg DOHENY ◽  
Eric J. JERVIS ◽  
M. Marta GUARNA ◽  
R. Keith HUMPHRIES ◽  
R. Antony J. WARREN ◽  
...  
Keyword(s):  
Stem Cell ◽  
Fusion Protein ◽  
Stem Cell Factor ◽  
Direct Analysis ◽  
Binding Domain ◽  
Target Cells ◽  
Cellulose Binding Domain ◽  
Binding Characteristics ◽  
Cellulose Binding ◽  
Cellulose Surface

A chimaera of stem cell factor (SCF) and a cellulose-binding domain from the xylanase Cex (CBDCex) effectively immobilizes SCF on a cellulose surface. The fusion protein retains both the cytokine properties of SCF and the cellulose-binding characteristics of CBDCex. When adsorbed on cellulose, SCF–CBDCex is up to 7-fold more potent than soluble SCF–CBDCex and than native SCF at stimulating the proliferation of factor-dependent cell lines. When cells are incubated with cellulose-bound SCF–CBDCex, activated receptors and SCF–CBDCex co-localize on the cellulose matrix. The strong binding of SCF–CBDCex to the cellulose surface permits the effective and localized stimulation of target cells; this is potentially significant for long-term perfusion culturing of factor-dependent cells. It also permits the direct analysis of the effects of surface-bound cytokines on target cells.

Phosphorylation of the cellulose surface with PCl3 and P(O)Cl3

2021 ◽  
pp. 1-5
Author(s):  
Marcin H. Kudzin ◽  
Zdzisława Mrozińska ◽  
Małgorzata Giełdowska ◽  
Agnieszka A. Krata ◽  
Paweł Urbaniak ◽  
...  
Keyword(s):  
Cellulose Surface

scholarly journals ADSORPTION OF NANOWOLLASTONITE ON CELLULOSE SURFACE: EFFECTS ON PHYSICAL AND MECHANICAL PROPERTIES OF MEDIUM-DENSITY FIBERBOARD (MDF)

CERNE ◽  
2016 ◽  
Vol 22 (2) ◽  
pp. 215-222 ◽  
Author(s):  
Hamid Reza Taghiyari ◽  
Roya Majidi ◽  
Asghar Jahangiri
Keyword(s):  
Mechanical Properties ◽  
Density Functional ◽  
Medium Density Fiberboard ◽  
Physical And Mechanical Properties ◽  
Mechanical Tests ◽  
National Standard ◽  
Medium Density ◽  
Wood Fibers ◽  
Strong Adsorption ◽  
Cellulose Surface

ABSTRACT Effects of nanowollastonite (NW) adsorption on cellulose surface were studied on physical and mechanical properties of medium-density fiberboard (MDF) panels; properties were then compared with those of MDF panels without NW-content. The size range of NW was 30-110 nm. The interaction between NW and cellulose was investigated using density functional theory (DFT). Physical and mechanical tests were carried out in accordance with the Iranian National Standard ISIRI 9044 PB Type P2 (compatible with ASTM D1037-99) specifications. Results of DFT simulations showed strong adsorption of NW on cellulose surface. Moreover, mechanical properties demonstrated significant improvement. The improvement was attributed to the strong adsorption of NW on cellulose surface predicted by DFT, adding to the strength and integrity between wood fibers in NW-MDF panels. It was concluded that NW would improve mechanical properties in MDF panels as a wood-composite material, as well as being effective in improving its biological and thermal conductivity.

Fabrication of durable hydrophobic cellulose surface from silane-functionalized silica hydrosol via electrochemically assisted deposition

2015 ◽  
Vol 132 (44) ◽  
pp. n/a-n/a ◽  
Author(s):  
Ning Guo ◽  
Yuanhui Chen ◽  
Qingqing Rao ◽  
Yunjie Yin ◽  
Chaoxia Wang
Keyword(s):  
Functionalized Silica ◽  
Silica Hydrosol ◽  
Cellulose Surface

Cellulase Adsorption and an Evaluation of Enzyme Recycle During Hydrolysis of Steam-Exploded Softwood Residues

2002 ◽  
pp. 641-654
Author(s):  
Yanpin Lu ◽  
Bin Yang ◽  
David Gregg ◽  
John N. Saddler ◽  
Shawn D. Mansfield
Keyword(s):  
Cellulase Adsorption ◽  
Hydrolysis Of ◽  
Enzyme Recycle
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