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https://www.readbyqxmd.com/read/28738644/biosensor-for-the-characterisation-of-hmao-b-inhibitors-and-the-quantification-of-selegiline
#1
Maximilian Aigner, Patricia Preissegger, Kurt Kalcher, Eda Mehmeti, Peter Macheroux, Dale Edmondson, Astrid Ortner
A novel human monoamine oxidase B (hMAO B) based biosensor for inhibitory measurements was developed. It allows both the characterisation of the type of enzyme inhibition and the sensitive and simple determination of inhibitors like selegiline hydrochloride. The sensor consists of a screen printed carbon working electrode modified with 20% manganese dioxide (MnO2) and the enzyme hMAO B, which was immobilised on the electrode via a dialysis membrane (regenerated cellulose, molecular weight cut-off 14000). Inhibition of hMAO B is evaluated by adding different concentrations of the inhibitor selegiline hydrochloride to the enzyme and applying a defined amount of the hMAO B substrate phenylethylamine (PEA)...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738635/microwave-induced-combustion-thermal-and-morphological-aspects-for-understanding-the-mechanism-of-ignition-process-for-analytical-applications
#2
Matheus F Pedrotti, Leticia S F Pereira, Cezar A Bizzi, Jose N G Paniz, Juliano S Barin, Erico M M Flores
In the present work, for the first time a systematic study was performed using an infrared camera and scanning electron microscopy (SEM) coupled to energy dispersive X-ray spectrometry (EDS) to evaluate the mechanisms involved in microwave-induced combustion method, which has been extensively used for sample preparation. Cellulose and glass fiber discs, wetted with the igniter solution (6molL(-1) NH4NO3), were evaluated under microwave field in a monomode system. The temperature of the discs surface was recorded during microwave irradiation and the effect of NH4NO3 concentration and irradiation time on cellulose oxidation was evaluated...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738551/biomass-saccharification-is-largely-enhanced-by-altering-wall-polymer-features-and-reducing-silicon-accumulation-in-rice-cultivars-harvested-from-nitrogen-fertilizer-supply
#3
Zahoor, Dan Sun, Ying Li, Jing Wang, Yuanyuan Tu, Yanting Wang, Zhen Hu, Shiguang Zhou, Lingqiang Wang, Guosheng Xie, Jianliang Huang, Aftab Alam, Liangcai Peng
In this study, two rice cultivars were collected from experimental fields with seven nitrogen fertilizer treatments. All biomass samples contained significantly increased cellulose contents and reduced silica levels, with variable amounts of hemicellulose and lignin from different nitrogen treatments. Under chemical (NaOH, CaO, H2SO4) and physical (hot water) pretreatments, biomass samples exhibited much enhanced hexoses yields from enzymatic hydrolysis, with high bioethanol production from yeast fermentation...
July 12, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28738544/a-xylanase-aided-enzymatic-pretreatment-facilitates-cellulose-nanofibrillation
#4
Lingfeng Long, Dong Tian, Jinguang Hu, Fei Wang, Jack Saddler
Although biological pretreatment of cellulosic fiber based on endoglucanases has shown some promise to facilitate cellulose nanofibrillation, its efficacy is still limited. In this study, a xylanase-aided endoglucanase pretreatment was assessed on the bleached hardwood and softwood Kraft pulps to facilitate the downstream cellulose nanofibrillation. Four commercial xylanase preparations were compared and the changes of major fiber physicochemical characteristics such as cellulose/hemicellulose content, gross fiber properties, fiber morphologies, cellulose accessibility/degree of polymerization (DP)/crystallinity were systematically evaluated before and after enzymatic pretreatment...
July 9, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28738503/integration-of-protein-extraction-with-a-stream-of-byproducts-from-marine-macroalgae-a-model-forms-the-basis-for-marine-bioeconomy
#5
Tejal K Gajaria, Poornima Suthar, Ravi S Baghel, Nikunj B Balar, Preeti Sharnagat, Vaibhav A Mantri, C R K Reddy
The present study describes an advanced biorefinery model for marine macroalgae that assumes significant importance in the context of marine bio-economy. The method investigated in this study integrates the extraction of crude proteins with recovery of minerals rich sap, lipids, ulvan and cellulose from fresh biomass of Ulva lactuca. The protein content extracted was 11±2.12% on dry weight basis with recovery efficiency of 68.75±4.01%. The amino acid composition of crude protein fraction showed iso-leucine as the most abundant amino acid with 16...
July 5, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28737375/matrix-assisted-3d-printing-of-cellulose-nanofibers-for-paper-microfluidics
#6
Sungchul Shin, Jinho Hyun
Cellulose nanofiber (CNF), one of the most attractive green bioresources, was adopted for construction of microfluidic devices using matrix-assisted 3D printing. CNF hydrogels can support structures printed using CAD design in a 3D hydrogel environment with the appropriate combination of rheological properties between the CNF hydrogel and ink materials. Amazingly, the structure printed freely in bulky CNF hydrogels was able to retain its highly resolved 3D features in an ultrathin 2D paper using a simple drying process...
July 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28737254/1d-and-2d-nmr-spectroscopy-of-bonding-interactions-within-stable-and-phase-separating-organic-electrolyte-cellulose-solutions
#7
Matthew T Clough, Christophe Fares, Roberto Rinaldi
Organic electrolyte solutions (mixtures containing an ionic liquid and a polar, molecular co-solvent) are highly versatile solvents for cellu-lose. However, the underlying solvent-solvent and solvent-solute interactions are not yet fully understood. Herein, mixtures of the ionic liquid 1-ethyl-3-methylimidazolium acetate, the co-solvent 1,3-dimethyl-2-imidazolidinone, and cellulose are investigated using 1D and 2D NMR spectroscopy. The use of a triply-13C-labelled ionic liq-uid enhances the signal-to-noise ratio for 13C NMR spectroscopy, enabling changes in bonding interactions to be accurately pinpoint-ed...
July 24, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28736723/synthesis-and-characterization-of-bacterial-cellulose-and-gelatin-based-hydrogel-composites-for-drug-delivery-systems
#8
W Treesuppharat, P Rojanapanthu, C Siangsanoh, H Manuspiya, S Ummartyotin
Bacterial cellulose and gelatin were successfully used to develop a hydrogel composite material. Hydrogel was synthesized by copolymerization between bacterial cellulose and gelatin. Scanning electron microscopy (SEM) images showed that the bacterial cellulose chain was uniform in size and shape. Glutaraldehyde was employed as a crosslinking agent. H-bonds were formed via the reaction between the amine and hydroxyl groups, which were the functional groups of the gelatin and bacterial cellulose, respectively...
September 2017: Biotechnology Reports
https://www.readbyqxmd.com/read/28736576/the-impact-of-considering-land-intensification-and-updated-data-on-biofuels-land-use-change-and-emissions-estimates
#9
Farzad Taheripour, Xin Zhao, Wallace E Tyner
BACKGROUND: The GTAP model has been used to estimate biofuel policy induced land use changes and consequent GHG emissions for more than a decade. This paper reviews the history of the model and database modifications and improvements that have occurred over that period. In particular, the paper covers in greater detail the move from the 2004 to the 2011 database, and the inclusion of cropland intensification in the modeling structure. RESULTS: The results show that all the changes in the global economy and agricultural sectors cause biofuels induced land use changes and associated emissions can be quite different using the 2011 database versus 2004...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28736462/sequential-release-of-multiple-drugs-from-flexible-drug-delivery-films
#10
Cheryl L Jennings, Ellis K Perry, Thomas D Dziubla, David A Puleo
Sequential release of drugs aligned with the phases of tissue healing could reduce scarring. To achieve this aim, layered film devices comprising cellulose acetate phthalate (CAP) and Pluronic F-127 (Pluronic) were loaded with ketoprofen, quercetin, and pirfenidone. Citrate plasticizers were added to impart flexibility. Release of two or three drugs in sequence over several days was obtained for all multilayered devices tested. Mechanical analysis showed that elongation increased and modulus decreased with increasing plasticizer content...
2017: International Journal of Polymeric Materials
https://www.readbyqxmd.com/read/28736147/novel-multifunctional-plant-growth-promoting-bacteria-in-co-compost-of-palm-oil-industry-waste
#11
Clament Fui Seung Chin, Yoshihide Furuya, Mohd Huzairi Mohd Zainudin, Norhayati Ramli, Mohd Ali Hassan, Yukihiro Tashiro, Kenji Sakai
Previously, a unique co-compost produced by composting empty fruit bunch with anaerobic sludge from palm oil mill effluent, which contributed to establishing a zero-emission industry in Malaysia. Little was known about the bacterial functions during the composting process and fertilization capacity of this co-compost. We isolated 100 strains from the co-compost on 7 types of enumeration media and screened 25 strains using in vitro tests for 12 traits, grouping them according to three functions: plant growth promoting (fixation of nitrogen; solubilization of phosphorus, potassium, and silicate; production of 3-indoleacetic acid, ammonia, and siderophore), biocontrolling (production of chitinase and anti-Ganoderma activity), and composting (degradation of lignin, xylan, and cellulose)...
July 20, 2017: Journal of Bioscience and Bioengineering
https://www.readbyqxmd.com/read/28736027/suppression-of-delayed-xenograft-rejection-by-resveratrol-in-a-hamster-to-rat-cardiac-transplantation-model
#12
Y Lian, C Gao, Y Wu, J Xia, Y Leng, Y Liu, M Zhu, J Chen, Z Qi
BACKGROUND: Delayed xenograft rejection (DXR) is an insurmountable barrier for xenotransplantation. Previous studies reported that hamster hearts transplanted into rats undergo DXR and stop functioning after the cessation of immunosuppression. Herein, we investigated the effects of resveratrol on preventing DXR in a hamster-to-rat vascularized cardiac xenograft model. METHODS: Hamster hearts were engrafted into Lewis rat recipients. Recipient rats received a graft acceptance-inducing treatment of leflunomide and FK506 for 2 weeks to prevent acute xenograft rejection (AXR)...
July 2017: Transplantation Proceedings
https://www.readbyqxmd.com/read/28735181/effects-of-cellulose-degradation-products-on-the-mobility-of-eu-iii-in-repositories-for-low-and-intermediate-level-radioactive-waste
#13
Veronica Diesen, Kerstin Forsberg, Mats Jonsson
The deep repository for low and intermediate level radioactive waste SFR in Sweden will contain large amounts of cellulosic waste materials contaminated with radionuclides. Over time the repository will be filled with water and alkaline conditions will prevail. In the present study degradation of cellulosic materials and the ability of cellulosic degradation products to solubilize and thereby mobilise Eu(III) under repository conditions has been investigated. Further, the possible immobilization of Eu(III) by sorption onto cement in the presence of degradation products has been investigated...
July 6, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28735007/lignocellulosic-micro-nanofibers-from-wood-sawdust-applied-to-recycled-fibers-for-the-production-of-paper-bags
#14
Quim Tarrés, Neus Pellicer, Ana Balea, Noemi Merayo, Carlos Negro, Angeles Blanco, Marc Delgado-Aguilar, Pere Mutjé
In the present work, lignocellulosic micro/nanofibers (LCMNF) were produced from pine sawdust. For that, pine sawdust was submitted to alkali treatment and subsequent bleaching stages, tailoring its chemical composition with the purpose of obtaining effective LCMNF. The obtained LCMNF were characterized and incorporated to recycled cardboard boxes with the purpose of producing recycled paper. The obtained results showed that it was possible to obtain LCMNF with the same reinforcing potential than those cellulose nanofibers (CNF) prepared by oxidative or other chemical methods In fact, the obtained papers increased the breaking length of recycled cardboard from 3338m to 5347m, being a value significantly higher than the requirements to produce paper bags...
July 19, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28735005/immobilization-of-antimicrobial-peptides-onto-cellulose-nanopaper
#15
Israel González, Helena Oliver-Ortega, Quim Tarrés, Marc Delgado-Aguilar, Pere Mutjé, David Andreu
In this work we report the production of cellulose nanopapers modified with alkyl ketene dimer (AKD) in order to allow the immobilization of antimicrobial peptides (AMPs) to produce surfaces with antimicrobial properties. Cellulose nanofibers (CNF) were prepared from softwood bleached pulp via high pressure homogenization after chemical pretreatment of fibers via TEMPO oxidation. Nanopapers were then prepared after a casting technique and functionalized with alkyl ketene dimer before AMPs were immobilized. The immobilization process was performed by submerging the samples into AMP aqueous solutions and then dried at room temperature...
July 19, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28734590/evaluation-of-electricity-generation-from-lignin-residue-and-biogas-in-cellulosic-ethanol-production
#16
Gang Liu, Jie Bao
This study takes the first insight on the rigorous evaluation of electricity generation based on the experimentally measured higher heating value (HHV) of lignin residue, as well as the chemical oxygen demand (COD) and biological oxygen demand (BOD5) of wastewater. For producing one metric ton of ethanol fuel from five typical lignocellulose substrates, including corn stover, wheat straw, rice straw, sugarcane bagasse and poplar sawdust, 1.26-1.85tons of dry lignin residue is generated from biorefining process and 0...
July 8, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28733938/molecular-cloning-heterologous-expression-and-functional-characterization-of-a-cellulolytic-enzyme-cel-prii-from-buffalo-rumen-metagenome
#17
Ravi K Shah, Amrutlal K Patel, Deepti M Davla, Ishan K Parikh, Ramalingam B Subramanian, Kamlesh C Patel, Subhash J Jakhesara, Chaitanya G Joshi
A cellulase encoding gene, Cel PRII, was identified from Mehsani buffalo rumen metagenome, and cloned and expressed in Escherichia coli BL21(DE3)pLysS. The 1170 bp full length gene encodes a 389 residue polypeptide (Cel PRII) containing a catalytic domain belonging to glycosyl hydrolase (GH) 5 family. The fusion protein consisting of the Cel PRII, thioredoxin tag and 6x Histidine tag with predicted molecular weight of 63 kDa when recovered from inclusion bodies under denaturing conditions, exhibited cellulolytic activity against carboxymethyl cellulose (CMC)...
August 2017: 3 Biotech
https://www.readbyqxmd.com/read/28733828/thermosensitive-in-situ-gel-based-on-solid-dispersion-for-rectal-delivery-of-ibuprofen
#18
Yangdan Liu, Xin Wang, Youping Liu, Xin Di
The objective of this study was to develop a thermosensitive in situ gel based on solid dispersions (SDs) for rectal delivery of ibuprofen (IBU). Thermosensitive (poloxamer 407) and mucoadhesive (hydroxypropylmethyl cellulose E5 and sodium alginate) polymers were used to prepare the in situ gel and the sol-gel transition temperature (T sol-gel) and gel strength were optimized. The in vitro release performance and in vivo pharmacokinetic properties of the in situ gel after their rectal administration to rabbits were investigated...
July 21, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28733671/short-chain-fatty-acids-and-inulin-but-not-guar-gum-prevent-diet-induced-obesity-and-insulin-resistance-through-differential-mechanisms-in-mice
#19
Karolin Weitkunat, Christin Stuhlmann, Anna Postel, Sandra Rumberger, Maria Fankhänel, Anni Woting, Klaus Jürgen Petzke, Sabrina Gohlke, Tim J Schulz, Michael Blaut, Susanne Klaus, Sara Schumann
The role of dietary fibre and short-chain fatty acids (SCFA) in obesity development is controversially discussed. Here, we investigated how various types of dietary fibre and different SCFA ratios affect metabolic syndrome-related disorders. Male mice (B6) were fed high-fat diets supplemented with dietary fibres (either cellulose, inulin or guar gum) or different Ac:Pr ratios (high acetate (HAc) or propionate (HPr)) for 30 weeks. Body-fat gain and insulin resistance were greatly reduced by inulin, but not by guar gum, and completely prevented by SCFA supplementation...
July 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28732923/effect-of-tempo-oxidization-and-rapid-cooling-on-thermo-structural-properties-of-nanocellulose
#20
Mhd Abd Cader Mhd Haniffa, Yern Chee Ching, Cheng Hock Chuah, Kuan Yong Ching, Nik Nazri, Luqman Chuah Abdullah, Liou Nai-Shang
Recently, surface functionality and thermal property of the green nanomaterials have received wide attention in numerous applications. In this study, microcrystalline cellulose (MCC) was used to prepare the nanocrystalline celluloses (NCCs) using acid hydrolysis method. The NCCs was treated with TEMPO [(2,2,6,6-tetramethylpiperidin-1-yl)oxy radical]-oxidation to prepare TEMPO-oxidized NCCs. Cellulose nanofibrils (CNFs) also prepared from MCC using TEMPO-oxidation. The effects of rapid cooling and chemical treatments on the thermo-structural property studies of the prepared nanocelluloses were investigated through FTIR, thermogravimetric analysis-derivative thermogravimetric (TGA-DTG), and XRD...
October 1, 2017: Carbohydrate Polymers
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