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https://www.readbyqxmd.com/read/29772341/development-of-an-auto-phase-separable-and-reusable-graphene-oxide-potato-starch-based-cross-linked-bio-composite-adsorbent-for-removal-of-methylene-blue-dye
#1
Amartya Bhattacharyya, Bhaskar Banerjee, Soumitra Ghorai, Dipak Rana, Indranil Roy, Gunjan Sarkar, Nayan Ranjan Saha, Sriparna De, Tapas Kumar Ghosh, Sourav Sadhukhan, Dipankar Chattopadhyay
In this work, we report the development of a cross-linked bio-composite consisting of graphene oxide, potato starch, cross-linker glutaraldehyde and its application to adsorption of the industrial dye, methylene blue, from aqueous solution. The inexpensiveness, non-hazardous nature and easy bio-degradability are the major reasons for the selection of starch material as one of the components of the bio-composite. The bio-composite has been characterized by FTIR, SEM, XRD, particle size and zeta potential analysis...
May 14, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29772336/dynamic-light-scattering-and-electrophoretic-mobility-studies-of-starch-fatty-acid-complexes-in-solution
#2
Anna Marinopoulou, Stylianos N Raphaelides
Electrophoretic mobility and dynamic light scattering measurements were carried out to investigate the physical characteristics of amylose inclusion complexes with a series of long chain fatty acids, in alkaline solution (0.1 N or 0.01 N KOH). Amylose molecules exhibited lower values of electrophoretic mobility compared to those of the amylose-fatty acid complexes. The presence of amylopectin affected the electrophoretic mobility of starch-fatty acid complexes. Particle size distribution measurements of amylose-fatty acid complexes in aqueous suspension (pH 4...
May 14, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29762618/theoretical-investigation-of-the-swelling-of-polysaccharide-microgels-in-sugar-solutions
#3
R G M van der Sman
In this paper, we explain the increased swelling of crosslinked polysaccharide microgels by the increase of sugar concentration using a modified Flory-Rehner theory. This theory is validated via the investigation of the swelling of dextran microgels in sugar solutions, which can be viewed as a model system for crosslinked starch in sugar solution and custard. An essential part of our modified theory is that starch perceives the sugar solution as an effective solvent rendering a certain hydrogen bond density...
May 15, 2018: Food & Function
https://www.readbyqxmd.com/read/29758308/synthesis-and-evaluation-of-acryloylated-starch-g-poly-acrylamide-vinylmethacrylate-1-vinyl-2-pyrrolidone-crosslinked-terpolymer-functionalized-by-dimethylphenylvinylsilane-derivative-as-a-novel-polymer-flooding-agent
#4
A N El-Hoshoudy, S M Desouky
Starch is a natural biopolymer that subjected to various chemical modifications through different industrial applications. Molecular structure of starch allow its grafting with different vinyl monomers in the presence of crosslinking agents to synthesize cross-linked hydrogels, which used in enhanced oil recovery (EOR) applications, water shutoff and drag reduction. Application of native starch in the field of petroleum reservoirs as a flooding agent suffer from some limitations concerned with microbial degradation, thermal and salinity resistance under harsh petroleum reservoir conditions...
May 11, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29753969/effects-of-curing-conditions-on-the-structure-of-sodium-carboxymethyl-starch-mineral-matrix-system-ft-ir-investigation
#5
Karolina Kaczmarska, Beata Grabowska, Artur Bobrowski, Sylwia Cukrowicz
Strength properties of the microwave cured molding sands containing binders in a form of the aqueous solution of sodium carboxymethyl starch (CMS-Na) are higher than the same molding composition cured by conventional heating. Finding the reason of this effect was the main purpose in this study. Structural changes caused by both physical curing methods of molding sands systems containing mineral matrix (silica sand) and polymer water-soluble binder (CMS-Na) were compared. It was shown, by means of the FT-IR spectroscopic studies, that the activation of the polar groups in the polymer macromolecules structure as well as silanol groups on the mineral matrix surfaces was occurred in the microwave radiation...
April 24, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29751040/structural-and-morphological-evaluation-of-cnc-reinforced-pva-starch-biodegradable-films
#6
Maria-Cristina Popescu, Bianca-Ioana Dogaru, Mirela Goanta, Daniel Timpu
Nanocomposite films containing cellulose nanocrystals (CNC), as the reinforcing phase, and poly(vinyl alcohol) (PVA)/starch (S) blend, as the matrix, were prepared by solution casting technique. For the preparation, 5, 10, 15 wt% CNC suspension were incorporated in blends containing 90 wt% PVA/10 wt% S, 75 wt% PVA/25 wt% S and 50 wt% PVA/50 wt% S. Structural evaluation was done by Fourier transform infrared spectrometry and X-ray diffraction, and the morphological aspects by atomic force microscopy...
May 8, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29733319/fabricating-high-viscosity-droplets-using-microfluidic-capillary-device-with-phase-inversion-co-flow-structure
#7
Jiang Li, Jia Man, Zhongnan Li, Haosheng Chen
The generation of monodisperse droplets with high viscosity has always been a challenge in droplet microfluidics. Here, we demonstrate a phase-inversion co-flow device to generate uniform high-viscosity droplets in a low-viscosity fluid. The microfluidic capillary device has a common co-flow structure with its exit connecting to a wider tube. Elongated droplets of the low-viscosity fluid are first encapsulated by the high-viscosity fluid in the co-flow structure. As the elongated low-viscosity droplets flow through the exit, which is treated to be wetted by the low-viscosity fluid, phase inversion is then induced by the adhesion of the low viscosity droplets to the tip of the exit, which results in the subsequent inverse encapsulation of the high-viscosity fluid...
April 17, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29729338/preparation-and-characterization-of-starch-based-composite-films-reinforced-by-cellulose-nanofibers
#8
Mahyar Fazeli, Meysam Keley, Esmaeil Biazar
The current study deals with the preparation and characterization of polysaccharide-based biocomposite films acquired by the incorporation of cellulose nanofiber within glycerol plasticized matrix formed by starch. The application of starch-based films is limited due to highly hydrophilic nature and poor mechanical properties. These problems are solved by forming a nanocomposite of thermoplastic starch (TPS) as matrix and cellulose nanofiber (CNF) as reinforcement. CNF is successfully prepared from short henequen fibers which consist of almost 60% cellulose by a chemo-mechanical process...
May 2, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29727647/valorisation-of-blueberry-waste-and-use-of-compression-to-manufacture-sustainable-starch-films-with-enhanced-properties
#9
Cláudia Leites Luchese, Jone Uranga, Jordana Corralo Spada, Isabel Cristina Tessaro, Koro de la Caba
Blueberry waste from juice processing was valorised to develop starch films by compression moulding. The compression process resulted in hydrophobic films with water contact angles even higher than 100° for the films prepared with the highest blueberry waste content. Additionally, the film solubility was reduced by the incorporation of blueberry waste, regardless of the solution pH. These films also exhibited good barrier properties against UV light due to the aromatic compounds present in the blueberry waste...
May 1, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29727641/a-comparative-study-on-the-properties-of-graphene-oxide-and-activated-carbon-based-sustainable-wood-starch-composites
#10
Prasanta Baishya, Tarun Kumar Maji
Activated carbon (AC) prepared from Jatropha curcas and graphene oxide (GO) were employed in the preparation of natural polymer based wood starch composites (WSC) through the solution blending technique using water as a solvent. In this study, methyl methacrylate (MMA) was grafted onto the starch polymer and this MMA grafted starch (MMA-g-starch) was cross-linked with the cheap soft wood flour using the citric acid as cross-linker and water as a solvent in the whole process. The prepared GO and AC were characterized through Fourier transform infrared spectroscopy (FTIR), X-ray diffractometry (XRD), thermogravimetric analysis (TGA) and Raman study...
May 1, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29716625/6-hydroxyethyl-starch-hes-130-0-4-diminishes-glycocalyx-degradation-and-decreases-vascular-permeability-during-systemic-and-pulmonary-inflammation-in-mice
#11
Andreas Margraf, Jan M Herter, Katharina Kühne, Anika Stadtmann, Thomas Ermert, Manuel Wenk, Melanie Meersch, Hugo Van Aken, Alexander Zarbock, Jan Rossaint
BACKGROUND: Increased vascular permeability is a pathophysiological hallmark of sepsis and results in increased transcapillary leakage of plasma fluid, hypovolemia, and interstitial edema formation. 6% hydroxyethyl starch (HES 130/0.4) is commonly used to treat hypovolemia to maintain adequate organ perfusion and oxygen delivery. The present study was designed to investigate the effects of 6% HES 130/0.4 on glycocalyx integrity and vascular permeability in lipopolysaccharide (LPS)-induced pulmonary inflammation and systemic inflammation in mice...
May 1, 2018: Critical Care: the Official Journal of the Critical Care Forum
https://www.readbyqxmd.com/read/29713558/effect-of-4dryfield-%C3%A2-ph-a-novel-adhesion-barrier-on-recurrence-of-intestinal-adhesions-after-extensive-visceral-adhesiolysis
#12
Gerhard Blumhardt, Matthias Haas, Stefanie Polte
Background: Adhesions occur after up to 97% of abdominal interventions causing chronic pain, infertility, and intestinal obstruction. Various concepts to prevent adhesions have been presented but mostly either have low efficacy or are not applicable in resective intestinal surgery or incomplete hemostasis. In this retrospective one-center clinical trial, the course of patients with extensive abdominal adhesiolysis and application of a recent starch-based formulation, 4DryField PH (4DF), is analyzed...
2018: Case Reports in Surgery
https://www.readbyqxmd.com/read/29703051/balanced-10-hydroxyethyl-starch-compared-with-balanced-6-hydroxyethyl-starch-and-balanced-crystalloid-using-a-goal-directed-hemodynamic-algorithm-in-pancreatic-surgery-a-randomized-clinical-trial
#13
Julia Werner, Oliver Hunsicker, Anja Schneider, Henryk Stein, Christian von Heymann, Adrian Freitag, Aarne Feldheiser, Klaus-Dieter Wernecke, Claudia Spies
BACKGROUND: While hydroxyethyl starch (HES) solutions are not recommended any longer in critically ill patients, data on efficacy and safety during surgery are still limited. METHODS: In a randomized controlled trial 63 patients were assigned to receive 10% HES (130/0.42), 6% HES (130/0.42), or crystalloid within a goal-directed hemodynamic algorithm during pancreatic surgery. The primary endpoints were intraoperative volume of HES and time until fully on oral diet...
April 2018: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29702553/cytokine-and-chemokine-recovery-is-increased-by-colloid-perfusates-during-dermal-microdialysis
#14
Sven R Quist, Claudia Kirbs, Charlotte Kloft, Harald P Gollnick
Cytokines and chemokines play important roles in cell signalling, and microdialysis is a promising tool for monitoring these inflammation markers ex vivo. Therefore, the collecting of these mediators at the highest concentrations possible is crucial. Depending on the size of the mediator of interest, the collection of these high molecular mass molecules has thus far been difficult due to their low recovery, even when using high cut-off (100 kDa) microdialysis membranes. This study aimed to optimize the recovery of various cytokines and chemokines by validating the use of different perfusates in cutaneous microdialysis, and comparing intravenous (i...
April 27, 2018: Materials
https://www.readbyqxmd.com/read/29692217/assessing-feasibility-and-safety-of-hydroxyethyl-starch-as-priming-solution-of-cardiopulmonary-bypass
#15
Gui-Zhen Yang, Fu-Shan Xue, Hui-Xian Li, Ya-Yang Liu
No abstract text is available yet for this article.
April 1, 2018: Perfusion
https://www.readbyqxmd.com/read/29691035/copper-mediated-homogeneous-living-radical-polymerization-of-acrylamide-with-waxy-potato-starch-based-macroinitiator
#16
Yifei Fan, Huatang Cao, Frank van Mastrigt, Yutao Pei, Francesco Picchioni
Cu0 -mediated living radical polymerization (Cu0 -mediated LRP) was employed in this research for the synthesis of starch-g-polyacrylamide (St-g-PAM). The use of a controlled radical grafting technique is necessary, as compared to the traditional free-radical polymerization methods, in order to obtain a well-defined structure of the final product. This is in turn essential for studying the relationship between such structure and the end-properties. Waxy potato starch-based water-soluble macroinitiator was first synthesized by esterification with 2-bromopropionyl bromide in the mixture of dimethylacetamide and lithium chloride...
July 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29686520/enhancement-of-yield-nutritional-and-nutraceutical-properties-of-two-common-bean-cultivars-following-the-application-of-seaweed-extract-ecklonia-maxima
#17
Anna Kocira, Michał Świeca, Sławomir Kocira, Urszula Złotek, Anna Jakubczyk
In the present study, application of Ecklonia maxima extract (Kelpak SL - a water soluble concentrate) was optimized and its impact on yield, nutraceutical and nutritional potential of Phaseolus vulgaris L. (var. Aura and Toska) was measured. The study was carried out in 2012 and 2013 in Poland. During the growing season, 0.2% and 0.4% solution of Kelpak SL was applied by single and double spraying of plants. These four treatments with Kelpak SL were compared with the control, where no biostimulator was applied...
March 2018: Saudi Journal of Biological Sciences
https://www.readbyqxmd.com/read/29684990/acid-base-alterations-during-major-abdominal-surgery-6-hydroxyethyl-starch-infusion-versus-5-albumin
#18
Hyun Jeong Kwak, Oh Kyung Lim, Jae Myung Baik, Youn Yi Jo
Background: To compare the effects of intraoperative infusions of balanced electrolyte solution (BES)-based hydroxyethyl starch (HES) and saline-based albumin on metabolic acidosis and acid/base changes during major abdominal surgery conducted using Stewart's approach. Methods: Forty patients, aged 20-65 years, undergoing major abdominal surgery, were randomly assigned to the HES group (n = 20; received 500 ml of BES-based 6% HES 130/0.4) or the albumin group (n = 20; received 500 ml of normal saline-based 5% albumin)...
April 24, 2018: Korean Journal of Anesthesiology
https://www.readbyqxmd.com/read/29683376/reply-to-assessing-feasibility-and-safety-of-hydroxyethyl-starch-as-priming-solution-of-cardiopulmonary-bypass
#19
Ø S Svendsen, M Farstad, A Mongstad, R Haaverstad, P Husby, V L Kvalheim
No abstract text is available yet for this article.
April 1, 2018: Perfusion
https://www.readbyqxmd.com/read/29665377/impact-of-super-disintegrants-and-film-thickness-on-disintegration-time-of-strip-films-loaded-with-poorly-water-soluble-drug-microparticles
#20
Lu Zhang, Marie Aloia, Barbara Pielecha-Safira, Honghao Lin, Prarthana Manoj Rajai, Kuriakose Kunnath, Rajesh N Davé
Although strip films are a promising platform for delivery of poorly water-soluble drug particles via slurry casting, the effect of critical materials attributes (CMAs), e.g., super-disintegrants on critical quality attributes (CQAs), including film disintegration time (DT), remains under-explored. A two-level factorial design is considered to examine the impact of the super-disintegrant (SDI) type (sodium starch glycolate and croscarmellose sodium), their amount, and film thickness. SDIs were used with hydroxypropyl methylcellulose (HPMC-E15LV) and glycerin solutions along with viscosity matching...
April 14, 2018: Journal of Pharmaceutical Sciences
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