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https://www.readbyqxmd.com/read/29786673/fabrication-flexible-and-luminescent-nanofibrillated-cellulose-films-with-modified-sral%C3%A2-o%C3%A2-eu-dy-phosphors-via-nanoscale-silica-and-aminosilane
#1
Longfei Zhang, Shaoyi Lyu, Zhilin Chen, Siqun Wang
Flexible 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-oxidized nanofibrillated cellulose (ONFC) films with long afterglow luminescence containing modified SrAl₂O₄: Eu2+ , Dy3+ (SAOED) phosphors were fabricated by a template method. Tetraethyl orthosilicate (TEOS) and (3-aminopropyl) trimethoxy-silane (APTMS) were employed cooperatively to improve the water resistance and compatibility of the SAOED particles in the ONFC suspension. The structure and morphology after modification evidenced the formation of a superior SiO₂ layer and coarse amino-compounds on the surface of the phosphors...
May 22, 2018: Nanomaterials
https://www.readbyqxmd.com/read/29786635/mechanical-behavior-optimization-of-chitosan-extracted-from-shrimp-shells-as-a-sustainable-material-for-shopping-bags
#2
Giacomo D'Angelo, Amal Elhussieny, Marwa Faisal, I S Fahim, Nicola M Everitt
The use of biodegradable materials for shopping bag production, and other products made from plastics, has recently been an object of intense research-with the aim of reducing the environmental burdens given by conventional materials. Chitosan is a potential material because of its biocompatibility, degradability, and non-toxicity. It is a semi-natural biopolymeric material produced by the deacetylation of chitin, which is the second most abundant natural biopolymer (after cellulose). Chitin is found in the exoskeleton of insects, marine crustaceans, and the cell walls of certain fungi and algae...
May 22, 2018: Journal of Functional Biomaterials
https://www.readbyqxmd.com/read/29785766/schizophyllum-commune-an-unexploited-source-for-lignocellulose-degrading-enzymes
#3
REVIEW
Omar Eduardo Tovar-Herrera, Adriana Mayrel Martha-Paz, Yordanis Pérez-LLano, Elisabet Aranda, Juan Enrique Tacoronte-Morales, María Teresa Pedroso-Cabrera, Katiushka Arévalo-Niño, Jorge Luis Folch-Mallol, Ramón Alberto Batista-García
Lignocellulose represents the most abundant source of carbon in the Earth. Thus, fraction technology of the biomass turns up as an emerging technology for the development of biorefineries. Saccharification and fermentation processes require the formulation of enzymatic cocktails or the development of microorganisms (naturally or genetically modified) with the appropriate toolbox to produce a cost-effective fermentation technology. Therefore, the search for microorganisms capable of developing effective cellulose hydrolysis represents one of the main challenges in this era...
May 21, 2018: MicrobiologyOpen
https://www.readbyqxmd.com/read/29785750/cellulose-membrane-modified-with-polypyrrole-as-an-extraction-device-for-the-determination-of-emerging-contaminants-in-river-water-with-gc-ms
#4
Bárbara Viero de Noronha, Márcio Fernando Bergamini, Luiz Humberto Marcolino Junior, Bruno José Gonçalves da Silva
In this study, a simple, efficient, and reusable device based on cellulose membranes modified with polypyrrole was developed to extract 14 emerging contaminants from aqueous matrices. For chemical polymerization, a low-cost cellulose membrane was immersed in 0.1 mol L-1 pyrrole and 0.5 mol L-1 ammonium persulfate for 40 min in an ice/water bath. The cellulose membranes modified with polypyrrole were accommodated in a polycarbonate holder suitable for solid-phase extraction disks. Solid-phase extraction parameters that affect extraction efficiency, such as sample volume, pH, flow-rate, and desorption were optimized...
May 21, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29785481/encapsulation-of-theophylline-in-gelatin-a-pectin-complex-coacervates
#5
Nirmala Devi, Chayanika Deka, Prajnya Nath, Dilip Kumar Kakati
The present study aims at synthesizing gelatin A-pectin complex coacervates and encapsulation of theophylline in the polymer system. Variation and optimization of different reaction parameters such as pH, ratio between the polymers and cross-linker concentration was carried out to attain higher product yield. Relative viscosity, turbidity and UV-visible measurements were done for optimization. The optimum ratio between gelatin A-pectin was fixed at weight ratio 42:8 and pH=3.5. It was further observed that adhesion between the microcapsules decreased by the use of sodium carboxymethyl cellulose (SCMC) to the coacervate...
2018: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29785208/developing-cellulolytic-yarrowia-lipolytica-as-a-platform-for-the-production-of-valuable-products-in-consolidated-bioprocessing-of-cellulose
#6
Zhong-Peng Guo, Julien Robin, Sophie Duquesne, Michael Joseph O'Donohue, Alain Marty, Florence Bordes
Background: Both industrial biotechnology and the use of cellulosic biomass as feedstock for the manufacture of various commercial goods are prominent features of the bioeconomy. In previous work, with the aim of developing a consolidated bioprocess for cellulose bioconversion, we conferred cellulolytic activity of Yarrowia lipolytica , one of the most widely studied "nonconventional" oleaginous yeast species. However, further engineering this strain often leads to the loss of previously introduced heterologous genes due to the presence of multiple LoxP sites when using Cre -recombinase to remove previously employed selection markers...
2018: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/29784299/effect-of-food-additives-on-egg-yolk-gelation-induced-by-freezing
#7
Monica Primacella, Tao Fei, Nuria Acevedo, Tong Wang
This study demonstrates technological advances in preventing yolk gelation during freezing and thawing. Gelation negatively affects yolk functionality in food formulation. Preventing gelation using 10% salt or sugar limits the application of the yolk. Novel food additives were tested to prevent gelation induced by freezing. Significant reduction (p < 0.05) in gel hardness of frozen-thawed yolk (45 h freezing at -20 °C) indicates that hydrolyzed carboxymethyl cellulose (HCMC), proline, and hydrolyzed egg white and yolk (HEW and HEY) are effective gelation inhibitors...
October 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29783198/toxicity-assessment-of-metal-oxide-nano-pollutants-on-tomato-solanum-lycopersicon-a-study-on-growth-dynamics-and-plant-cell-death
#8
Bilal Ahmed, Mohammad Saghir Khan, Javed Musarrat
The present study for the first time demonstrated the interactions of metal oxide (MO) nano-pollutants (CuO and Al2 O3 -NPs) with tissues and cellular DNA of tomato plants grown in soil sand: silt: clay (667:190:143) and Hoagland-hydroponic system and assessed the hazardous effects of NPs on cell physiology and biochemistry. Results of SEM equipped with EDX revealed attachment of variably shaped CuO-NPs (18 nm) and Al2 O3 -NPs (21 nm) on roots, and internalization followed by translocation in plants by ICP-MS and TEM...
May 18, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29782983/an-in-vivo-biocompatibility-study-of-surgical-meshes-made-from-bacterial-cellulose-modified-with-chitosan
#9
Joanna Piasecka-Zelga, Piotr Zelga, Joanna Szulc, Justyna Wietecha, Danuta Ciechańska
Bacterial cellulose modified with chitosan (MBC) is an innovative biomaterial used in regenerative medicine which may potentially improve treatment outcomes mesh for hernia repair surgery by facilitating better absorption in native tissue with less risk of mesh-related infections. The aim of the present study was to evaluate the biocompatibility of mesh based on MBC, and determine whether immunological reactions occur due to hypersensitivity to the implants. Forty five Imp:WIST rats were randomly assigned to be implanted with one of three mesh types: simple polypropylene mesh (n = 15), mesh modified by bacterial cellulose only (n = 15) and MBC mesh (n = 15) and evaluated after one and three months following intramuscular implantation...
May 18, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29782971/pharmaceutical-grade-oral-films-as-substrates-for-printed-medicine
#10
M Wimmer-Teubenbacher, C Planchette, H Pichler, D Markl, W K Hsiao, A Paudel, S Stegemann
In contact-less printing, such as piezo-electric drop on demand printing used in the study, the drop formation process is independent of the substrate. This means that having developed a printable formulation, printed pharmaceutical dosage forms can be obtained on any pharmaceutical grade substrate, such as polymer-based films. In this work we evaluated eight different oral films based on their suitability as printing substrates for sodium picosulfate. The different polymer films were compared regarding printed spot morphology, chemical stability and dissolution profile...
May 18, 2018: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29782664/stereoselective-hplc-separation-of-alvimopan-on-cellulose-based-immobilized-polysaccharide-as-a-chiral-stationary-phase
#11
Nitin H Dhekale, Dattatray B Gunjal, Anil H Gore, Yagnakirankumar Komaravolu, K Hima Bindu, Govind B Kolekar
Chiral separation by normal phase high performance liquid chromatography is one of the most powerful technique to quantify the chiral purity of the compounds. In this study, a novel, simple, and specific analytical method was proposed to ascertain the chiral purity of alvimopan (ALV). The normal phase HPLC method was developed based on cellulose tris (3,5-dichlorophenylcarbamate) stationary phase. The separation of ALV isomers achieved by using column CHIRALPAK IC (250 × 4.6 mm, 5 μm), mobile phase n-hexane: isopropyl alcohol: ethanol: diethylamine (650:200:150:5 v/v), column oven temperature 30°C, flow rate 1...
May 21, 2018: Chirality
https://www.readbyqxmd.com/read/29782536/fungal-type-carbohydrate-binding-modules-from-the-coccolithophore-emiliania-huxleyi-show-binding-affinity-to-cellulose-and-chitin
#12
Bart J M Rooijakkers, Martina S Ikonen, Markus B Linder
Six fungal-type cellulose binding domains were found in the genome of the coccolithophore Emiliania huxleyi and cloned and expressed in Escherichia coli. Sequence comparison indicate high similarity to fungal cellulose binding domains, raising the question of why these domains exist in coccolithophores. The proteins were tested for binding with cellulose and chitin as ligands, which resulted in the identification of two functional carbohydrate binding modules: EHUX2 and EHUX4. Compared to benchmark fungal cellulose binding domain Cel7A-CBM1 from Trichoderma reesei, these proteins showed slightly lower binding to birch and bacterial cellulose, but were more efficient chitin binders...
2018: PloS One
https://www.readbyqxmd.com/read/29782055/clinical-and-immunological-effects-of-adsorptive-myeloid-lineage-leukocyte-apheresis-in-patients-with-immune-disorders
#13
REVIEW
Takuro Kanekura
Adsorptive granulocyte and monocyte apheresis (GMA) with the Adacolumn® is an extracorporeal treatment, which uses cellulose acetate (CA) beads as adsorptive leukocytapheresis carriers designed to remove elevated and potentially activated myeloid lineage leukocytes. Reports on the clinical efficacy of GMA in patients with skin lesions have appeared in the published work. Dermatological diseases, which are known to respond to GMA, include pyoderma gangrenosum, skin lesions of Behçet's disease, rheumatoid arthritis, pustular psoriasis, psoriatic arthritis, adult-onset Still's disease, Sweet's syndrome, cutaneous allergic vasculitis and systemic lupus erythematosus rashes...
May 21, 2018: Journal of Dermatology
https://www.readbyqxmd.com/read/29781240/predominant-nonproductive-substrate-binding-by-fungal-cellobiohydrolase-i-and-implications-for-activity-improvement
#14
Mikhail L Rabinovich, Maria S Melnik, Mikhail L Herner, Yakov V Voznyi, Lilia G Vasilchenko
Enzymatic conversion of the most abundant renewable source of organic compounds, cellulose to fermentable sugars is attractive for production of green fuels and chemicals. The major component of industrial enzyme systems, cellobiohydrolase I from Hypocrea jecorina (Trichoderma reesei) (HjCel7A) processively splits disaccharide units from the reducing ends of tightly packed cellulose chains. HjCel7A consists of a catalytic domain (CD) and a carbohydrate-binding module (CBM) separated by a linker peptide. A tunnel-shaped substrate-binding site in the CD includes 9 subsites for β-D-glucose units, 7 of which (-7 to -1) precede the catalytic center...
May 21, 2018: Biotechnology Journal
https://www.readbyqxmd.com/read/29781060/effects-of-physical-and-chemical-aspects-on-membrane-fouling-and-cleaning-using-interfacial-free-energy-analysis-in-forward-osmosis
#15
Wanzhu Zhang, Bingzhi Dong
Natural organic matter (NOM) in micro-polluted water purification using membranes is a critical issue to handle. Understanding the fouling mechanism in the forward osmosis (FO) process, particularly identifying the predominant factor that controls membrane fouling, could have significant effects on exerting the advantages of FO technique. Cellulose triacetate no-woven (CTA-NW) membrane is applied to experiments with a high removal efficiency (> 99%) for the model foulant. Tannic acid (TA) is used as a surrogate foulant for NOM in the membrane fouling process, thus enabling the analysis of the effects of physical and chemical aspects of water flux, retention, and adsorption...
May 20, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29780532/towards-a-molecular-understanding-of-cellulose-dissolution-in-ionic-liquids-anion-cation-effect-synergistic-mechanism-and-physicochemical-aspects
#16
REVIEW
Yao Li, Jianji Wang, Xiaomin Liu, Suojiang Zhang
Cellulose is one of the most abundant bio-renewable materials on the earth and its conversion to biofuels provides an appealing way to satisfy the increasing global energy demand. However, before carrying out the process of enzymolysis to glucose or polysaccharides, cellulose needs to be pretreated to overcome its recalcitrance. In recent years, a variety of ionic liquids (ILs) have been found to be effective solvents for cellulose, providing a new, feasible pretreatment strategy. A lot of experimental and computational studies have been carried out to investigate the dissolution mechanism...
May 7, 2018: Chemical Science
https://www.readbyqxmd.com/read/29780519/molecular-mechanism-of-lytic-polysaccharide-monooxygenases
#17
Erik Donovan Hedegård, Ulf Ryde
The lytic polysaccharide monooxygenases (LPMOs) are copper metalloenzymes that can enhance polysaccharide depolymerization through an oxidative mechanism and hence boost generation of biofuel from e.g. cellulose. By employing density functional theory in a combination of quantum mechanics and molecular mechanics (QM/MM), we report a complete description of the molecular mechanism of LPMOs. The QM/MM scheme allows us to describe all reaction steps with a detailed protein environment and we show that this is necessary...
April 21, 2018: Chemical Science
https://www.readbyqxmd.com/read/29780036/revised-phylogeny-of-the-cellulose-synthase-gene-superfamily-insights-into-cell-wall-evolution
#18
Alan Little, Julian G Schwerdt, Neil J Shirley, Shi F Khor, Kylie Neumann, Lisa A O'Donovan, Jelle Lahnstein, Helen M Collins, Marilyn Henderson, Geoffrey B Fincher, Rachel A Burton
Cell walls are crucial for the integrity and function of all land plants, and are of central importance in human health, livestock production, and as a source of renewable bioenergy. Many enzymes that mediate the biosynthesis of cell wall polysaccharides are encoded by members of the large cellulose synthase (CesA) gene superfamily. Here, we analyzed 29 sequenced genomes and 17 transcriptomes to revise the phylogeny of the CesA gene superfamily in angiosperms. Our results identify ancestral gene clusters that predate the monocot-eudicot divergence and reveal several novel evolutionary observations, including the expansion of the Poaceae-specific cellulose synthase-like CslF family to the graminids and restiids and the characterisation of a previously unreported eudicot lineage, CslM, that forms a reciprocally monophyletic eudicot-monocot grouping with the CslJ clade...
May 20, 2018: Plant Physiology
https://www.readbyqxmd.com/read/29779373/water-in-water-emulsion-gels-stabilized-by-cellulose-nanocrystals
#19
Emna Ben Ayed, Remy Cochereau, Cyrille Dechance, Isabelle Capron, Taco Nicolai, Lazhar Benyahia
Particle stabilized water-in-water emulsions were prepared by mixing dextran and poly(ethylene oxide) (PEO) in water and adding cellulose nanocrystals (CNC). The CNC formed a layer at the surface of the dispersed droplets formed by the PEO rich phase. Excess CNC partitioned to the continuous dextran phase. Aggregation of CNC at different rates was induced by adding NaCl between 10 mM and 100 mM. In the presence of more than 2 g/L CNC, fast aggregation led to the formation of an emulsion gel showing no signs of creaming...
May 19, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29779122/heterologous-expression-of-talaromyces-emersonii-cellobiohydrolase-cel7a-in-trichoderma-reesei-increases-the-efficiency-of-corncob-residues-saccharification
#20
Ningning Sun, Yuanchao Qian, Weiwei Wang, Yaohua Zhong, Meixue Dai
OBJECTIVE: Improve the hydrolysis efficiency of the Trichoderma reesei cellulase system by heterologously expressing cellobiohydrolase Cel7A (Te-Cel7A) from the thermophilic fungus Talaromyces emersonii. RESULTS: Te-Cel7A was expressed in T. reesei under control of the cdna1 promoter and the generated transformant QTC14 could successfully secrete Te-Cel7A into the supernatant using glucose as carbon source. The recombinant Te-Cel7A had a temperature optimum at 65 °C and an optimal pH of 5, which were similar to those from the native host...
May 19, 2018: Biotechnology Letters
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