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All total 16 Articles be found
All total 16 Articles be foundA new protection group strategy for cellulose in an ionic liquid: simultaneous protection of two sites to yield 2,6-di-O-substituted mono-p-methoxytrityl cellulose
Granstr?m, Mari,Olszewska, Anna,M?kel?, Valtteri,Heikkinen, Sami,Kilpel?inen, Ilkka
, p. 1744 - 1747 (2009)
Increased reactivity of cellulose in ionic liquids was revealed when cellulose was protected with a 4-methoxytrityl moiety in the imidazolium-based ionic liquid, 1-allyl-3-methylimidazolium chloride ([amim]Cl). Selectively protected 2,6-di-O-(4-methoxytri
Vacuum-assisted layer-by-layer electrospun membranes: Antibacterial and antioxidative applications
Zhou, Bin,Jin, Xing,Li, Jing,Xu, Wei,Liu, Shilin,Li, Yan,Li, Bin
, p. 54517 - 54524 (2014)
Layer-by-layer assembled films have been exploited for functional materials. Tannic acid with previously confirmed antibacterial and antioxidant potentials was deposited on cellulose nanofibrous mats. The LbL assembly technique allowed sufficient binding of TA and AgNPs-Lys to the supporting substrate via hydrogen bond and electrostatic interactions. The properties and morphology of the AgNPs-Lys/TA multilayer assembly membranes were characterized by X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectra (FT-IR), wide-angle X-ray diffraction (XRD), and scanning electron microscopy (SEM). The antibacterial and antioxidant activities were examined as well. The hybrid composite films have potential application in food packing and wound dressing, and tissue engineering, etc. This journal is
Layer-by-layer structured polysaccharides film-coated cellulose nanofibrous mats for cell culture
Deng, Hongbing,Zhou, Xue,Wang, Xiaoying,Zhang, Chunyan,Ding, Bin,Zhang, Qiuhua,Du, Yumin
, p. 474 - 479 (2010)
For the first time, a novel fibrous polysaccharide scaffold for cell culture was fabricated by the combination of electrospinning and electrostatic layer-by-layer (LBL) self-assembly technique. Oppositely charged chitosan (CS) and alginate (ALG) in aqueous media were alternatively deposited onto the negatively charged cellulose nanofibrous mats which hydrolyzed from electrospun cellulose acetate mats. The morphology and biocompatibility of the resultant scaffolds were investigated by regulating the pH of dipping solutions, the number of deposition bilayers, and the composition of outermost layer. Field emission scanning electron microscopy images indicated that the scaffolds possessed the fibrous structure and the thickness of CS/ALG bilayer formed on fibers was estimated in the range of 8-15 nm. The X-ray photoelectron spectroscopy results verified the existence of nitrogen element of CS on the surface of LBL films. The cell culture experiments demonstrated that the scaffolds have good biocompatibility for Beas-2B human bronchial epithelial cells in vitro.
Regioselective synthesis of lipophilic dithiocarbamate derivatives of cellulose to prepare a novel solvent extraction reagent for selective extraction of PGM ions and Cu(II)
Dhakal, Rabindra Prasad,Inoue, Katsutoshi,Ohto, Keisuke,Baba, Yoshinari
, p. 1064 - 1065 (2006)
Regenerated cellulose from cellulose triacetate was regiose-lectively converted into its lipophilic amino and dithiocarbamate derivatives to prepare novel solvent extraction reagents with series of substitutions and deoxy substitution reaction. The 6-de-oxydithiocarbamate-2,3-didecyl cellulose prepared in this work significantly demonstrated the high lipophilicity coupled with high selectivity for PGM ions and also to the Cu(II) over Ni(II) and Zn(II) in liquid-liquid extraction. Copyright
Functionalized Celluloses with Regular Substitution Pattern by Glycosynthase-Catalyzed Polymerization
Codera, Victoria,Edgar, Kevin J.,Faijes, Magda,Planas, Antoni
, p. 1272 - 1279 (2016/05/09)
Control of the monomer sequence in polymers is extraordinarily difficult by chemical synthesis, though Nature routinely exerts such control, including in the biosynthesis of polysaccharides. This inability has prevented us from being able to match the exquisite structure-activity control exhibited in biosynthesis of bioactive natural polysaccharides. We here address a powerful approach, whereby enzyme-catalyzed polymerization of properly modified building blocks is introduced as a simple route affording polysaccharides with controlled sequence and functionalization pattern. Targeting cellulose as a versatile scaffold for novel biomaterials, we describe the preparation of a perfectly alternating polysaccharide with repeat unit 6′-azido-6′-deoxycellobiose by a glycosynthase-catalyzed polymerization using the Humicola insolens cellulase Cel7B E197A mutant, and its further functionalization to give novel modified cellulose derivatives with a regular substitution pattern.
