- A 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
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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
- Granstr?m, Mari,Olszewska, Anna,M?kel?, Valtteri,Heikkinen, Sami,Kilpel?inen, Ilkka
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- Structural parameters of cellulose produced by Acetobacter Xylinum and their variation in the course of drying of gel films
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The cellulose-producing power of the VKM V-800 Acetobacter xylinum strain under conditions of static culture was studied. The culture medium was optimized with the aim to increase the cellulose yield and obtain highly crystalline cellulose I with molecula
- Baklagina,Khripunov,Tkachenko,Gladchenko,Lavrent'ev,Volkov,Nilova,Denisov,Sukhanova,Zanaveskina,Klechkovskaya,Feigin
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- Vacuum-assisted layer-by-layer electrospun membranes: Antibacterial and antioxidative applications
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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
- Zhou, Bin,Jin, Xing,Li, Jing,Xu, Wei,Liu, Shilin,Li, Yan,Li, Bin
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- Synthesis of cellulose in vitro by using a cellulase/surfactant complex in a nonaqueous medium
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High and dry: The synthesis in vitro of longer-chain cellulose with more than 100 anhydrous glucopyranose units in the polymer has been performed by a new technique for glycosynthesis. This method uses enzymatic polymerization with enzyme/surfactant complexes that act in nonaqueous organic media. (Chemical Equation Presented).
- Egusa, Shizuka,Kitaoka, Takuya,Goto, Masahiro,Wariishi, Hiroyuki
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- Layer-by-layer structured polysaccharides film-coated cellulose nanofibrous mats for cell culture
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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.
- Deng, Hongbing,Zhou, Xue,Wang, Xiaoying,Zhang, Chunyan,Ding, Bin,Zhang, Qiuhua,Du, Yumin
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- The surface structure of well-ordered native cellulose fibrils in contact with water
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CP/MAS 13C NMR spectroscopy was used in combination with spectral fitting to examine the surface structure of hydrated cellulose I fibrils from Halocynthia and Gluconoacetobacter xylinus. To increase the spectral intensities and minimize signal overlap, G. xylinus celluloses site-specifically enriched in 13C either on C4 or on both C1 and C6 were examined. The experimental data showed multiple C4 and C6 signals for the water accessible fibril surfaces in the highly crystalline celluloses. These signal multiplicities were attributed to structural features in the surface layers induced by the fibril interior, and could not be extracted by spectral fitting in celluloses with a lower degree of crystallinity such as cellulose from cotton.
- Malm, Erik,Bulone, Vincent,Wickholm, Kristina,Larsson, Per Tomas,Iversen, Tommy
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- Regioselective synthesis of lipophilic dithiocarbamate derivatives of cellulose to prepare a novel solvent extraction reagent for selective extraction of PGM ions and Cu(II)
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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
- Dhakal, Rabindra Prasad,Inoue, Katsutoshi,Ohto, Keisuke,Baba, Yoshinari
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- Functionalised Chromatography Medium Comprising Polymer Nanofibres and Process of Preparation Thereof
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The present invention provides a functionalised polymeric chromatography medium, prepared by a process which comprises (i) providing a substrate formed of one or more polymer nanofibres, (ii) grafting one or more neutral polymer chains from the substrate, and (iii) contacting the grafted product with a reagent which functionalises the product of step (ii) as a chromatography medium, wherein step (ii) comprises reacting a plurality of compounds of formula and/or its enantiomers, and/or its derivatives of formula (I) and/or enantiomers and/or diastereomers thereof: with one or more functional groups present on the nanofibre substrate, wherein R1, R2, R3, R4 and R5 may be the same or different, and are chosen from H, halogen, C1-C4 alkyl, or C1-C4 alkoxy provided that at least one of R1, R2, R3, R4 or R5 is not hydrogen.
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Page/Page column 18-27; 29
(2019/10/20)
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- Functionalized Celluloses with Regular Substitution Pattern by Glycosynthase-Catalyzed Polymerization
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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.
- Codera, Victoria,Edgar, Kevin J.,Faijes, Magda,Planas, Antoni
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p. 1272 - 1279
(2016/05/09)
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- MULTISTAGE FRACTIONATION PROCESS FOR RECALCITRANT C5 OLIGOSACCHARIDES
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Methods are disclosed for increasing the level of C5 monosaccharides produced from lignocellulosic biomass using a multistage fractionation process to handle recalcitrant C5 oligosaccharides without producing unwanted degradation products. Methods for reducing C5 monosaccharides degradation products produced from lignocellulosic biomass are also disclosed. In addition, compositions and products produced by the methods are disclosed.
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- Fibrinogen-coated particles for therapeutic use
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The invention provides a particle comprising fibrinogen bound on the surface of an albumin matrix, wherein said particle is capable of coaggregation with platelet, and of aggregation in a solution containing soluble fibrinogen at a concentration of soluble fibrinogen not capable by it self of formation of a clot upon activation by thrombin.
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- Cyclodextrin derivatives having at least one nitrogen-containing heterocycle, their preparation and use
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Reactive cyclodextrin derivatives have at least one nitrogen-containing heterocycle. The reactive cyclodextrin derivatives include at least one nitrogen-containing heterocycle having at least one electrophilic center.
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- Resolution of stereoisomers of aliphatic epoxides
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A method of resolving a mixture of stereoisomers of an aliphatic epoxide containing two or less oxygen atoms is provided. The method comprises utilizing a polysaccharide or a derivative thereof as a resolving agent.
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- Method of mosquito control
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A process is described for the control of the development of mosquitos in a body of water, by spreading on the body of water a particulate carbohydrate compound. The carbohydrate compound may be a given compound that forms a hydrophillic gum-like layer once spread on the surface of the water. The gum-like layer prevents the development of mosquito in the larvae and pupae stages. It is also believed to inhibit the laying of eggs on the water surface by the female mosquito. The layer found is environmentally safe as the carbohydrates used are common in food products.
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- Preparation having excellent absorption property
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A preparation containing an absorption promoter selected from specific classes of water-soluble macromolecular compounds having chelating activity, preferably in the presence of a salt at a concentration such that the composition exhibits higher osmotic pressure than isotonic sodium chloride solution, and a medicine is found to promote absorption of the medicine through a gastrointestinal organ such as the colon, rectum, or vagina.
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- Controlled release pesticides
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Controlled release pesticide-polymers are prepared by reacting a polymer having a pendant group containing a reactive hydrogen with a chloroformamide derivative of a pesticide. In a preferred embodiment, metribuzin chloroformamide is prepared by reacting metribuzin with phosgene at a temperature of about 40° C. The metribuzin chloroformamide is then reacted with cellulose to form a pesticide-polymer from which the metribuzin is released under use conditions by hydrolytic degradation of the carbamate bond attaching the metribuzin to the polymer.
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