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Carbohydrate Polymers

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https://www.readbyqxmd.com/read/28522008/chitosan-chondroitin-sulfate-hydrogels-prepared-in-hmim-hso4-ionic-liquid
#1
Cátia S Nunes, Kessily B Rufato, Paulo R Souza, Elizângela A M S de Almeida, Michael J V da Silva, Débora B Scariot, Celso V Nakamura, Fernanda A Rosa, Alessandro F Martins, Edvani C Muniz
[Hmim][HSO4] ionic liquid (IL) and bio-renewable sources as chitosan (CHT) and chondroitin sulfate (CS) were used to yield hydrogel-based materials (CHT/CS). The use of IL to solubilize both polysaccharides was considered an innovative way based on "green chemistry" principle, aiming the production of CHT/CS blended systems. CHT/CS hydrogels were carried out in homogeneous medium from short dissolution times. The hydrogels were characterized and achieved with excellent stabilities (in the 1.2-10pH range), larger swelling capacities, as well as devoid of cytotoxicity towards the normal VERO and diseased HT29 cells...
August 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28522007/guar-gum-benzoate-nanoparticle-reinforced-gelatin-films-for-enhanced-thermal-insulation-mechanical-and-antimicrobial-properties
#2
Sonia Kundu, Aatrayee Das, Aalok Basu, Md Farooque Abdullah, Arup Mukherjee
This work relates to guar gum benzoate self assembly nanoparticles synthesis and nano composite films development with gelatin. Guar gum benzoate was synthesized in a Hofmeister cation guided homogeneous phase reaction. Self assembly polysaccharide nanoparticles were prepared in solvent displacement technique. Electron microscopy and DLS study confirmed uniform quasi spherical nanoparticles with ζ-potential - 28.7mV. Nanocomposite films were further developed in gelatin matrix. The film capacity augmenting due to nanoparticles incorporation was noteworthy...
August 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28522006/the-influence-of-solvent-formulations-on-thermosensitive-hydroxybutyl-chitosan-hydrogel-as-a-potential-delivery-matrix-for-cell-therapy
#3
Zixian Bao, Changqing Jiang, Zhiguo Wang, Qiuxia Ji, Guohui Sun, Shichao Bi, Ya Liu, Xiguang Chen
Many cell delivery matrices have been developed due to the low transplantation efficiency of cell therapy. In the present study, thermosensitive hydroxybutyl chitosan (HBC) hydrogels were prepared with different formulations' solvent (Dulbecco's modified eagle's medium/phosphate buffered saline [DMEM/PBS], 0:100, 30:70, 50:50, 70:30, 100:0 [v/v]). Their gelation temperature was raised with DMEM ratio increase (from 9.5°C to 20.9°C). Pore sizes of HBC hydrogels treated with high ionic strength solutions became smaller...
August 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28522005/biocompatible-microcrystalline-cellulose-particles-from-cotton-wool-and-magnetization-via-a-simple-in-situ-co-precipitation-method
#4
Mehnaz Rashid, Mohammad Abdul Gafur, Mostafa Kaiyum Sharafat, Hideto Minami, Mohd Abdul Jalil Miah, Hasan Ahmad
This investigation describes the preparation of magnetically doped degradable microcrystalline cellulose (MCC) nanocomposite particles with application potential in biotechnology, solid support for biomolecule/water purification, oil recovery from water and beyond. MCC was first extracted from cotton wool, the most abundant biocompatible polymer, by sulfuric acid hydrolysis and the effect of acid strength was examined. The size of the elongated fiber structure was reduced with increasing acid strength. MCC particles extracted by treatment with 70% sulfuric acid were used to prepare magnetic MCC nanocomposite particles...
August 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28522004/development-of-biocompatible-glycodynameric-hydrogels-joining-two-natural-motifs-by-dynamic-constitutional-chemistry
#5
Luminita Marin, Daniela Ailincai, Simona Morariu, Liliana Tartau-Mititelu
The paper focusses on the synthesis of novel hydrogels by joining natural biodegradable compounds with the aim to achieve biocompatible materials for bio related applications. The hydrogels were prepared from chitosan and citral by constitutional dynamic chemistry, incorporating both molecular and supramolecular dynamic features. The hydrophobic flexible citral has been reversible immobilized onto the hydrophilic chitosan backbone via imine bonds to form amphiphilic glycodynamers, which further self-ordered through supramolecular interactions into a 3D-network of biodynameric hydrogel...
August 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28522003/lactobacillus-plantarum-cidca-8327-an-%C3%AE-glucan-producing-strain-isolated-from-kefir-grains
#6
M V Gangoiti, A I Puertas, M F Hamet, P J Peruzzo, M G Llamas, M Medrano, A Prieto, M T Dueñas, A G Abraham
Lactobacillus plantarum CIDCA 8327 is an exopolysaccharide (EPS)-producer strain isolated from kefir with promising properties for the development of functional foods. The aim of the present study was to characterize the structure of the EPS synthesized by this strain grown in skim milk or semidefined medium (SDM). Additionally, genes involved in EPS synthesis were detected by PCR. L. plantarum produces an EPS with a molecular weight of 10(4)Da in both media. When grown in SDM produce an heteropolysaccharide composed mainly of glucose, glucosamine and rhamnose meanwhile the EPS produced in milk was composed exclusively of glucose indicating the influence of the sugar source...
August 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28522002/freeze-dried-cylinders-carrying-chitosan-nanoparticles-for-vaginal-peptide-delivery
#7
Marzia Marciello, Silvia Rossi, Carla Caramella, Carmen Remuñán-López
Recently nanoparticle-based vaginal drug delivery formulations have been acquiring great attention for the administration of peptide based-vaccines or microbicides to prevent or treat sexually transmitted diseases. In this work, a straightforward and efficient strategy for the vaginal application and release of peptide-loaded mucoadhesive nanoparticles was developed. This essentially consists of chitosan nanoparticles encapsulated in suitable hydrophilic freeze-dried cylinders. Chitosan nanoparticles are responsible for carrying the peptide drug and allowing adhesion to the vaginal mucosal epithelium...
August 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28522001/cytotoxic-effect-of-a-mannogalactoglucan-extracted-from-agaricus-bisporus-on-hepg2-cells
#8
Amanda do Rocio Andrade Pires, Andrea Caroline Ruthes, Silvia Maria Suter Correia Cadena, Marcello Iacomini
A mannogalactoglucan (RK2-Ab; Mw 1.8×10(4)gmol(-1)) composed by Man (27.3%), Gal (24.4%) and Glc (48.3%) was extracted and characterized from Agaricus bisporus, and its biological activity was evaluated on human hepatocarcinoma cells (HepG2). The partially-O-methylated alditol acetates together with the NMR data suggest the main chain to be composed of α-d-Galp (32.8%) and β-d-Glcp (37.0%) units (1→6)-linked, with β-d-Manp (14.6%), as non-reducing end units, substituting the side chains at O-2 (α-d-Galp units; 3...
August 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28522000/in-vitro-antioxidant-and-antibacterial-activity-of-sulfated-polysaccharides-isolated-from-spatoglossum-asperum
#9
Subramanian Palanisamy, Manoharan Vinosha, Thangapandi Marudhupandi, Periyannan Rajasekar, Narayanan Marimuthu Prabhu
Fucoidan was extracted productively from Spatoglossum asperum and its antioxidant and antibacterial potential against Aeromonos hydrophila was investigated. The isolated fucoidan was characterized by HPLC, FTIR, (1)H and (13)C NMR spectrum. The isolated fucoidan contained 60.9% fucose, 21.35±0.81% sulfate and 4.2±0.56% protein, respectively. The in vitro antioxidant activity was evaluated by DPPH radical scavenging, reducing power and total antioxidant activities. The extracted fucoidan showed antioxidant properties in a dose-dependent manner...
August 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28521999/hyaluronan-random-coils-in-electrolyte-solutions-a-molecular-dynamics-study
#10
Marek Ingr, Eva Kutálková, Josef Hrnčiřík
A computational method of modeling random coils of hyaluronan was developed based on the molecular-dynamics simulations. An oligosaccharide of 48 monosaccharide units was equilibrated within a 70-100ns simulation and randomly chosen pieces of this molecule from different simulation frames were combined to constitute a long polysaccharide chain, both for hyaluronan and its non-ionic analog containing glucose instead of glucuronic acid. The dihedral angles of the glycoside connections of the pieces obeyed the statistics deduced from the simulation...
August 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28521998/co2-switchable-behavior-of-chitosan-g-poly-2-dimethylamino-ethyl-methacrylate-as-an-emulsifier
#11
Yeong-Tarng Shieh, Yen-Tzu Lin, Chih-Chia Cheng
Chitosan-g-poly[(2-dimethylamino)ethyl methacrylate] was investigated as a CO2-switchable emulsifier in this study. Poly(2-dimethylamino)ethyl methacrylate (PDMAEMA) was prepared by atom transfer radical polymerization followed by grafting to chitosan (CS). The CO2-responsiveness and reversible CO2-switchable temperature- and pH-sensitive behavior of PDMAEMA and CS-g-PDMAEMA were investigated as emulsifiers via simple CO2 and N2 bubbling. The lower critical solution temperatures (LCSTs) of PDMAEMA and CS-g-PDMAEMA aqueous solutions both increased as pH decreased to about pH 7...
August 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28521997/biodegradable-collagen-sponge-reinforced-with-chitosan-calcium-pyrophosphate-nanoflowers-for-rapid-hemostasis
#12
Tingsheng Yan, Feng Cheng, Xinjing Wei, Yudong Huang, Jinmei He
Efficient and biodegradable hemostatic materials become increasingly important in civilian and military clinical. However, traditional hemostatic materials are difficult to achieve expected effects especially in parenchymal organs with rich vascularity. In facing these challenges, we designed a biodegradable collagen sponge reinforced with chitosan/calcium pyrophosphate nanoflowers (CPNFs-Col sponge) for rapid hemostasis. With specific performances, such as rapid water absorption ability, the positive surface rich in amino groups and high specific surface area (952...
August 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28521996/antimicrobial-agent-free-hybrid-cationic-starch-sodium-alginate-polyelectrolyte-films-for-food-packaging-materials
#13
Ferhat Şen, İrem Uzunsoy, Emre Baştürk, Memet Vezir Kahraman
This study aimed to develop polyelectrolyte structured antimicrobial food packaging materials that do not contain any antimicrobial agents. Cationic starch was synthesized and characterized by FT-IR spectroscopy and (1)H NMR spectroscopy. Its nitrogen content was determined by Kjeldahl method. Polyelectrolyte structured antimicrobial food packaging materials were prepared using starch, cationic starch and sodium alginate. Antimicrobial activity of materials was defined by inhibition zone method (disc diffusion method)...
August 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28521995/synthesis-of-full-interpenetrating-hemicellulose-hydrogel-networks
#14
Laleh Maleki, Ulrica Edlund, Ann-Christine Albertsson
Two methods with different cross-linking mechanisms for designing hemicellulose-based full interpenetrating polymer networks (IPNs) were developed through the sequential synthesis of full IPNs from O-acetyl-galactoglucomannan (AcGGM) utilizing free-radical polymerization and a thiol-ene click reaction. A faster swelling rate was observed for all IPN formulations compared with the single-network gels. The highly porous structure of the IPNs with small interconnected pores was verified using scanning electron microscopy...
August 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28521994/double-coated-enrofloxacin-microparticles-with-chitosan-and-alginate-preparation-characterization-and-taste-masking-effect-study
#15
Mengxi Liu, Daiping Yin, Hualin Fu, Fengying Deng, Guangneng Peng, Gang Shu, Zhixiang Yuan, Fei Shi, Juchun Lin, Ling Zhao, Lizi Yin, Guoqing Fan
Enrofloxacin (ENRO) is widely used as an antimicrobial drug for treatment of uncomplicated and complicated infections in veterinary medicine. Its bitter taste limits its clinical applications in veterinary. To mask the bitter taste of this drug, double-coated taste-masking microparticles of ENRO (DTME) were prepared through stearic acid solid dispersion and chitosan-alginate microparticle coating technologies. The taste-masking effect was evaluated by pig feeding experiment. Results showed that DTME exhibited a spherical-like shape (170490μm)...
August 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28521993/chitosan-oligosaccharides-inhibit-epithelial-cell-migration-through-blockade-of-n-acetylglucosaminyltransferase-v-and-branched-glcnac-structure
#16
Qingsong Xu, Wenjing Wang, Chen Qu, Jianguo Gu, Heng Yin, Zhihao Jia, Linsheng Song, Yuguang Du
Chitosan oligosaccharides (COS) have been shown to regulate various cellular and biological functions. The aim of this study was to investigate the antimetastatic potency of COS and the underlying mechanism. Here, we established a stably N-acetylglucosaminyltransferase V (GnT-V)-overexpressed MCF10A cell line. As expected, GnT-V overexpression greatly promoted cell migration in the transfectants by using wound healing assay. However, the induction in the cell migration was significantly suppressed by an addition of COS...
August 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28521992/tragacanth-nanocapsules-containing-chamomile-extract-prepared-through-sono-assisted-w-o-w-microemulsion-and-uv-cured-on-cotton-fabric
#17
Soraya Ghayempour, Majid Montazer
Encapsulation is the best method to protect the plant extracts against volatility and instability in the presence of air, light, moisture and high temperatures. Nevertheless, application of encapsulated plant extracts on the textiles requires a low-temperature and high rate processing to avoid from breaking or destroying of capsules. The present paper represents application of nanocapsules prepared by ultrasound irradiation assisted W/O/W microemulsion method on the cotton fabric through UV curing method. The surface and structure of nanocapsules and treated cotton fabric using FESEM and FT-IR indicated the spherical nanocapsules with size of 60-80nm stabilized on the fabric surface in a film layer feature...
August 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28521991/nmr-characterization-of-cellulose-acetate-mole-fraction-of-monomers-in-cellulose-acetate-determined-from-carbonyl-carbon-resonances
#18
Hiroyuki Kono, Chinatsu Oka, Ryota Kishimoto, Sayaka Fujita
Cellulose acetate (CA) samples with varying degrees of substitution were prepared via homogeneous acetylation in 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) and by the acid-hydrolysis of cellulose triacetate in acetic acid. Quantitative analysis of the (13)C NMR spectra facilitated the assignment of the carbonyl carbon shifts of the 2-mono-, 3-mono-, 6-mono-, 2,3-di-, 2,6-di-, 3,6-di-, and 2,3,6-tri-substituted anhydroglucose units (AGUs), and the determination of the mole fraction of 7 AGUs and unsubstituted AGU in the CA chains...
August 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28521990/preparation-of-chitosan-composite-film-reinforced-with-cellulose-isolated-from-oil-palm-empty-fruit-bunch-and-application-in-cadmium-ions-removal-from-aqueous-solutions
#19
Rahmi, Lelifajri, Julinawati, Shabrina
Chitosan composite films reinforced with cellulose isolated from oil palm empty fruit bunch had been successfully prepared and applied in cadmium ions removal from aqueous solutions. Cellulose particles were isolated by hydrolyzing oil palm empty fruit bunch with hydrochloric acid. Several compositions were prepared by varying the chitosan/cellulose ratio of composites. The structure and the properties of composites were investigated by Fourier transformed infrared spectroscopy (FTIR), X-ray diffraction (XRD) and mechanical performance measurement...
August 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28521989/synthesis-of-strontium-chondroitin-sulfate-and-the-evaluation-of-its-capability-to-attenuate-osteoarthritis
#20
F B Ma, N Liu, N Hu, C Y Wen, B Tang
Osteoarthritis (OA) is the most prevalent musculoskeletal disorder and the leading cause of joint disability in elderly patients. In this study, we fabricated strontium chondroitin sulfate (SrCS), a new polysaccharide-metal ion complex that is the combination of chondroitin sulfate and strontium, which are two widely adopted chemicals in OA clinical management. The structural, chemical compositions and morphology of as-fabricated SrCS were systematically investigated. Cell proliferation test, RT-PCR and preliminary animal studies were conducted to evaluate the clinical potential of SrCS on OA treatment...
August 15, 2017: Carbohydrate Polymers
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