نتایج جستجو برای: hydrolyses of cellulose
تعداد نتایج: 21167296 فیلتر نتایج به سال:
Alkaline pretreatment with NaOH under mild operating conditions was used to improve ethanol and biogas production from softwood spruce and hardwood birch. The pretreatments were carried out at different temperatures between minus 15 and 100oC with 7.0% w/w NaOH solution for 2 h. The pretreated materials were then enzymatically hydrolyzed and subsequently fermented to ethanol or anaerobically di...
In muro deacetylation of xylan affects lignin properties and improves saccharification of aspen wood
BACKGROUND Lignocellulose from fast growing hardwood species is a preferred source of polysaccharides for advanced biofuels and "green" chemicals. However, the extensive acetylation of hardwood xylan hinders lignocellulose saccharification by obstructing enzymatic xylan hydrolysis and causing inhibitory acetic acid concentrations during microbial sugar fermentation. To optimize lignocellulose f...
An acid proteinase from Aspergillus oryzae was isolated from a commercial powder by successive (NH4)2SO4 fractionation, acetone precipitation, and ion-exchange chromatography on phosphate- and DEAE-cellulose columns. The purified enzyme was found to be homogeneous by ultracentrifuge-sedimentation analysis (S20, W equal 3.63S), but electrofocusing in polyacrylamide gels and electrophoresis at pH...
Background and Objectives: In recent years, use of oleogels as replacers of structured oils has received much attentions due to the health concerns. The objective of the present study was preparation of reinforced ethyl cellulose-based oleogels with adipic acid as replacers of shortening in cakes. Materials & Methods: First, oleogel samples were prepared using ethyl cellulose (at two various ...
Two DNA polymerase isoenzymes, called DpA and DpB on the basis of their elution order from DEAE cellulose, were purified to homogeneity from the thermo-acidophilic eubacterium Bacillus acidocaldarius. The enzymes are weakly acidophilic proteins constituted by a single subunit of 117 and 103 kDa respectively. DpA and DpB differ in thermostability, in thermophilicity, in sensitivity to assay cond...
Acanthamoeba is a free-living amoeba that is an opportunistic pathogen of humans and animals. Its prognosis is potentially poor that requires fast diagnosis and successful treatment. There are two phases in its life cycle: an active trophozoite form and the double-walled resistant cyst. This amoebic genus is the causative agent of two severe diseases in humans: Acanthamoeba keratitis (AK) and ...
there are many reports on the application of different hydrocolloids in the production of leavened breads; most of which show positive effects on bread quality. however, there is little information to prove such effect on flat breads. the main aim of this study was to improve the quality of barbari dough and bread (iranian flat bread) in terms of texture, taste and general acceptability of fres...
abstract background and objective: the formation of urinary infection by uropathogenic e.coli needs numerous virulence factors and biofilm formation is among these factors. bacteria that form biofilms express phenotype traits that appear according to the bacteria type. cellulose is an important compound on the outside of e.coli causing bacterial cell-cell reactions and connection to no...
Nano-cellulose with high amount of free OH groups could be used as supporting agents for boron trifluoride (BF3). Nano-BF3/cellulose is a solid acid and a biodegradable catalyst which was prepared via reaction of nano-cellulose and BF3. The structure of this catalyst was studied by FT-IR, FESEM, TEM, XRD, EDS, TGA, XRF and BET. In this research, the synthesis of...
in this research, (carboxy-3-oxopropylamino)-3-propylsilylcellulose (copapsc) as an organocatalyst, has been synthesized by grafting of succinic anhydride on the nh2-modified cellulose (cellulose functionalized with 3- aminopropyltriethoxysilane). the –co2h group-functionalized cellulose (copapsc) is used as a catalyst for the synthesis of coumarin derivatives from the reaction of phenolic subs...
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