نتایج جستجو برای: cellulose derivatives

تعداد نتایج: 134228  

2005
J. Bugla W. Szeja

We report herein the separation of enantiomers of glycerol derivatives on a cellulose-modified chiral column (Chiracel OD) in normal-phase mode. This method is suitable for monitoring the progress of the reaction and for determination of the enantiomeric purity of products. The lipase Novozyme 435-catalysed enantioselective hydrolysis of 1-O-benzyl-2,3di-O-octanoyl-rac-glycerol has been shown t...

Journal: :Colloids and Surfaces A: Physicochemical and Engineering Aspects 2021

Modification of cellulose derivatives with citric acid leads to gain in sorption capacity towards metal ions, which has been many times applied for heavy sequestration. This work, the first time, investigated in-situ coating a carbon electrode acid-crosslinked derivatives. The occurrence crosslinking bonds was revealed using infrared spectroscopy and thermogravimetric analysis, while other feat...

2011
Omid Rajabi BiBi Sedigheh Fazly Bazzaz Ali Reza Vaseghi Roshanak Salari

Silver nanoparticles have proved to possess significant antibacterial properties. Nanosilver produced by electrochemical reduction stabilized by cellulose derivatives, has been evaluated by European standards (CEN TC 216) in order to find out whether they could be applied in food, industrial, domestic and institutional areas as a suitable disinfectant. Moreover, bactericidal activity of nanosil...

2014
Ari Ivaska Yasuhito Sugano

Cellulose is expected to have a key role in the sustainable society in the future. This natural polysaccharide can be used as alternative raw material to petrochemical products. Cellulose based functional materials can be modified to desired applications by changing their physicochemical properties. Chemical and/or biochemical reactions have so far been used to modify chemical groups on cellulo...

2012
Laura Taajamaa Eero Kontturi Janne Laine Orlando J. Rojas

Morphologies featured in bicomponent 2D ultrathin films were reproduced on 3D non-woven microfibre structures. Fibre networks were constructed by electrospinning hydrophobised cellulose derivatives, trimethylsilyl cellulose (TMSC) and cellulose triacetate (CTA), dissolved in a common solvent. Diverse morphologies were obtained depending on the polymer blend ratio: electrospinning of TMSC produc...

2006
Hans-Joachim G. Jung

The benzoic and cinnamic acids found in forages were tested for their inhibitory effects on digestion of cellulose and hemicellulose by mixed cultures of rumen microorganisms in vitro. Rate and extent of cellulose digestion with the addition of cinnamic acids were determined. The benzoic acids and aldehydes were also compared for their inhibitory potential. Of the benzoic acid derivatives, only...

Journal: :Molecules 2018
Daehwan Kim

A pretreatment of lignocellulosic biomass to produce biofuels, polymers, and other chemicals plays a vital role in the biochemical conversion process toward disrupting the closely associated structures of the cellulose-hemicellulose-lignin molecules. Various pretreatment steps alter the chemical/physical structure of lignocellulosic materials by solubilizing hemicellulose and/or lignin, decreas...

Journal: :Chemical Engineering Journal 2023

Bio-based and biodegradable polymers are essential for a sustainable society. Cellulose is the most abundant biopolymer on earth; however, derivatization necessary its processing, which slows down biodegradability dramatically, e.g. used cigarette filters made from cellulose acetate barely biodegradable. We developed first reversible modification of cellulose, allows processing guarantees full ...

Journal: :Biomaterials 2004
Emilia Entcheva Harold Bien Lihong Yin Chiung-Yin Chung Melissa Farrell Yordan Kostov

Cellulose and its derivatives have been successfully employed as biomaterials in various applications, including dialysis membranes, diffusion-limiting membranes in biosensors, in vitro hollow fibers perfusion systems, surfaces for cell expansion, etc. In this study, we tested the potential of cellulose acetate (CA) and regenerated cellulose (RC) scaffolds for growing functional cardiac cell co...

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