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Carbohydrate Polymers

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https://www.readbyqxmd.com/read/28606552/self-assembly-of-nitrogen-doped-carbon-dots-anchored-on-bacterial-cellulose-and-their-application-in-iron-ion-detection
#1
Pengfei Lv, Yixin Yao, Dawei Li, Huimin Zhou, Muhammad Awais Naeem, Quan Feng, Jieyu Huang, Yibing Cai, Qufu Wei
Nitrogen-doped carbon dots (N-CDs) were synthesized through a facile hydrothermal method using citric acid (CA) and ethanediamine (EDA) as precursors. A green and simple fluorescence biosensor was obtained by biosynthesis of bacterial cellulose (BC)/N-CDs. As-prepared N-CDs with rich functional groups exhibited a blue emission under the excitation wavelength of 350nm. Biosynthesis of BC/N-CDs was analyzed by Digital photos, Fourier Transform Infrared (FTIR) and Transmission Electron Microscopy (TEM). The results indicated that N-CDs were successfully anchored on BC...
September 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28606551/carboxymethylation-of-polysaccharide-from-morchella-angusticepes-peck-enhances-its-cholesterol-lowering-activity-in-rats
#2
Yao Li, Ya Yuan, Lin Lei, Fuhua Li, Yueqiao Zhang, Jinlong Chen, Guohua Zhao, Surui Wu, Ran Yin, Jian Ming
The chemically carboxymethylated polysaccharide (CPMEP), which is derived from the purified polysaccharide from Morchella angusticepes Peck (PMEP), was prepared. The degree of substitution of CPMEP was 0.461. Fourier transform infrared spectra analysis and (13)C, (1)H, and DEPT135° NMR spectra indicated C6 position was partially substituted by CH2COOH. Moreover, serum total cholesterol of hypercholesterolemic rats treated with the high dose of PMEP and CPMEP was 1.54mmol/L and 1.29mmol/L compared with that of rats fed with a 2% cholesterol diet (1...
September 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28606550/chitosan-mediated-synthesis-of-flowery-cuo-and-its-antibacterial-and-catalytic-properties
#3
Gownolla Malegowd Raghavendra, Jeyoung Jung, Dowan Kim, Jongchul Seo
In the current investigation, CuO with a flower-like morphology has been successfully synthesized in situ in a chitosan medium (0.0015gmL(-1)) from copper nitrate (Cu(NO3)2·3H2O) and ammonia solution via a facile microwave-induced method. The as-prepared CuO was characterized by SEM, TEM, EDX, XRD, FTIR and TGA. The antibacterial activity of the flower-CuO against Escherichia coli was examined by analyzing colony forming units, and it was proved that the flower-CuO was able to kill >99% bacteria. Further, the flower-CuO exhibited excellent catalytic activity towards the reduction of 4-nitrophenol to 4-aminophenol in the presence of NaBH4...
September 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28606549/molecular-weight-and-helix-conformation-determine-intestinal-anti-inflammatory-effects-of-exopolysaccharide-from-schizophyllum-commune
#4
Bin Du, Yuedong Yang, Zhaoxiang Bian, Baojun Xu
Intestinal anti-inflammatory activities of exopolysaccharide from S. commune were assessed using dextran sulfate sodium (DSS)-induced colitis in mice model. The changes of molecular weight (MW), atomic force microscope morphology, X-ray diffraction, particle size distribution, and viscosity were recorded after sonication treatment. The results indicated that the triple helical structure of exopolysaccharide was dissociated into single helical structure and random coiled structure by ultrasonication via breaking of inter- and intramolecular hydrogen bonds...
September 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28606548/mechanical-properties-of-waste-paper-jute-fabric-reinforced-polyester-resin-matrix-hybrid-composites
#5
Sekhar Das
Hybrid composites were prepared with jute fabric and un-shredded newspaper in polyester resin matrix. The experiment was designed 1:2 weights ratio jute and unshredded newspaper to have 42 (w/w)% fibre content hybrid composites and two different sequences jute/paper/jute and paper/jute/paper of waste newspaper and jute fabric arrangement. Reinforcing material is characterized by chemically, X-ray diffraction methods, Fourier transform infrared spectroscopy and tensile testing. The tensile, flexural and interlaminar shear strength and fracture surface morphology of composites were evaluated and compared...
September 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28606547/self-assembled-supermolecular-hydrogel-based-on-hydroxyethyl-cellulose-formation-in-vitro-release-and-bacteriostasis-application
#6
Nan Sun, Ting Wang, Xiufeng Yan
Self-assembly of cellulose-based hydrogel is a new supermolecular architecture with potential for biomedical applications. In this study, a novel cellulose-based, supermolecular self-assembled hydrogel (gel-(β)CDP-HEC) was studied, which was based on the host-guest interaction between hydrophobic lauryl side chains grafting on hydroxyethyl cellulose (HECC12) and the cavities in poly(β-cyclodextrin) (β-CDP). The critical concentrations of HECC12 and β-CDP should be both fixed at 30mgmL(-1) by the results of dynamic viscosity, rheological property and swelling ratio...
September 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28606546/advanced-multi-targeted-composite-biomaterial-dressing-for-pain-and-infection-control-in-chronic-leg-ulcers
#7
Ovidio Catanzano, Rachael Docking, Patricia Schofield, Joshua Boateng
This study aimed to develop advanced biomaterial polysaccharide based dressings to manage pain associated with infected chronic leg ulcers in older adults. Composite carrageenan (CARR) and hyaluronic acid (HA) dressings loaded with lidocaine (LID) and AgNPs were formulated as freeze-dried wafers and functionally characterized for porous microstructure (morphology), mechanical strength, moisture handling properties, swelling, adhesion and LID release. Antimicrobial activity of AgNPs was evaluated (turbidity assay) against Escherichia coli, Pseudomonas aeruginosa and Staphylococcus aureus whilst cell viability studies (MTT) was performed on normal adult human primary epidermal keratinocyte cells...
September 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28606545/wheat-starch-carbamate-production-molecular-characterization-and-film-forming-properties
#8
Carolin Menzel, Gulaim Seisenbaeva, Peter Agback, Mikael Gällstedt, Antal Boldizar, Kristine Koch
Wheat starch carbamates of different degrees of substitution were produced in laboratory experiments and for the first time their film forming performance were investigated. The carbamation reaction between urea and starch was investigated using a factorial design. Long reaction time, 2h, and high urea content, 10 and 25%, resulted in a high degree of substitution, 0.07 and 0.15, respectively. These starch carbamates were assumed to be cross-linked and showed best film forming properties resulting in continuous and firm films...
September 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28606544/mining-marine-shell-wastes-for-polyelectrolyte-chitosan-anti-biofoulants-fabrication-of-high-performance-economic-and-ecofriendly-anti-biofouling-coatings
#9
Reda F M Elshaarawy, Fatma H A Mustafa, Lasse van Geelen, Amaal E A Abou-Taleb, Hermine R Z Tadros, Rainer Kalscheuer, Christoph Janiak
Banning organotins as antifouling biocides in 2003 was the starting point for many researchers to search for novel economic and environmentally-friendly anti-fouling biocides. In our present contribution, we have successfully functionalized a natural biopolymer, chitosan (CS), isolated from marine wastes with polyelectrolyte brushes akin to ionic liquids. These antifouling biopolymers anchoring polyelectrolyte brushes were in vitro assessed for their ability to eradicate or inhibit the Staphylococcal/Escherichia biofilms...
September 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28606543/structural-investigations-on-arabinogalactan-proteins-from-a-lycophyte-and-different-monilophytes-ferns-in-the-evolutionary-context
#10
Desirée Bartels, Birgit Classen
Today, understanding of cell wall evolution is incomplete due to limited knowledge of cell wall structure of non-flowering plants. Besides polysaccharides, proteoglycans like arabinogalactan-proteins are important constituents of the cell wall of most if not all seed plants. This article provides the first detailed characterization of AGPs from a lycophyte and different ferns, which are the closest living relatives to seed plants. The amount of protein in fern AGPs (6-12%) was in a range comparable to most seed plant AGPs...
September 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28606542/hydroxyapatite-crystallization-in-shrimp-cephalothorax-wastes-during-subcritical-water-treatment-for-chitin-extraction
#11
Angélica Espíndola-Cortés, Rosario Moreno-Tovar, Lauro Bucio, Miquel Gimeno, José Luis Ruvalcaba-Sil, Keiko Shirai
The extraction of calcareous chitin from shrimp cephalothorax was successfully achieved using a subcritical water treatment to attain a deproteinization up to 96%. The treatments also increased the crystalline domain size in the α-chitin fibers. An experimental design of Taguchi allowed the optimization of experiments. The macroelements identified in all samples were Ca, P, S, K, Cl and Al, whereas Cr, Mn, Fe, Ni, Cu, Zn, Br and Sr were also detected as microelements. The assigned crystalline phases by XRD were α-chitin, calcite, HAP and traces of quartz...
September 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28606541/pectin-conjugated-silica-microcapsules-as-dual-responsive-carriers-for-increasing-the-stability-and-antimicrobial-efficacy-of-kasugamycin
#12
Chen Fan, Mingcheng Guo, You Liang, Hongqiang Dong, Guanglong Ding, Wenbing Zhang, Gang Tang, Jiale Yang, Dandan Kong, Yongsong Cao
Kasugamycin is an aminoglycoside antibiotic originally isolated from Streptomyces kasugaensis, which has been widely used for the management of plant diseases. However, photo-thermal instability and low efficiency limit its application. Therefore, it is an urgent task to prevent unwanted loss of kasugamycin and ensure maximum bioactivity at target site. In this work, a novel formulation of kasugamycin that responds to different biological stimuli produced by pests was prepared using silica microcapsules crosslinked with pectin via special disulfide bonds...
September 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28606540/dielectric-behaviour-of-montmorillonite-cyanoethylated-cellulose-nanocomposites
#13
Nadeesh Madusanka, Sai G Shivareddy, Mark D Eddleston, Pritesh Hiralal, Rachel A Oliver, Gehan A J Amaratunga
A dielectric nanocomposite based oncyanoethylatedcellulose (CRS) and MMT nanoclay was successfully prepared with different weight percentages (5%, 10% and 15%) of MMT. MMT nanoplatets obtained via sonication of MMT nanoclay in acetone for a prolonged period was used in the preparation of CRS-MMT nanocomposites. CRS-MMT thin films on SiO2/Si wafers are used to form metal-insulator-metal (MIM) type capacitors. At 1kHz CRS-MMT nanocomposites exhibited high dielectric constants (εr) of 71, 55 and 42 with low leakage current densities (10(-6)-10(-7)A/cm(2)) for nanocomposites with 5%, 10% and 15% weight of MMT respectively, higher than values of pure CRS (21), Na-MMT(10)...
September 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28606539/polysaccharides-with-immunomodulating-activity-from-roots-of-gentiana-crassicaulis
#14
Yuan-Feng Zou, Yu-Ping Fu, Xing-Fu Chen, Ingvild Austarheim, Kari Tvete Inngjerdingen, Chao Huang, Fei-Yi Lei, Xu Song, Lixia Li, Gang Ye, Lemlem Dugassa Eticha, Zhongqiong Yin, Berit Smestad Paulsen
Two polysaccharides, GCP-I-I and GCP-II-I, were obtained from 100°C water extracts of Gentiana crassicaulis roots by DEAE anion exchange chromatography and gel filtration. The results from methanolysis, methylation, FT-IR and NMR, indicated that these two fractions are typical pectic polysaccharides, with HG and RG-I regions and AG-I/AG-II side chains, and some of the galacturonic acid units of fraction GCP-I-I were methyl esterified. Fractions GCP-I-I and GCP-II-I, both exhibited potent complement fixation, and fraction GCP-I-I was more potent than positive control BPII...
September 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28606538/antibacterial-activity-and-mechanisms-of-depolymerized-fucoidans-isolated-from-laminaria-japonica
#15
Ming Liu, Yixiang Liu, Min-Jie Cao, Guang-Ming Liu, Qingchou Chen, Lechang Sun, Haixiu Chen
Fucoidans, sulfated polysaccharides in brown algae, were depolymerized though high-pressure hydrolysis, and their antibacterial activity, structural properties, and antibacterial mechanisms were investigated in this work. The fucoidans from Laminaria japonica show no antibacterial activity before depolymerization; however, their depolymerized products can effectively (p<0.05) inhibit the proliferation of Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). The structure-activity study demonstrated that lower molecular weight and stronger polyanionic property can promote the antibacterial activity...
September 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28606537/enhanced-mechanical-properties-of-hydrothermal-carbamated-cellulose-nanocomposite-film-reinforced-with-graphene-oxide
#16
Sinyee Gan, Sarani Zakaria, Sharifah Nabihah Syed Jaafar
Cellulose carbamate (CC) was synthesized via hydrothermal process and mixed with graphene oxide (GO) to form a homogeneous cellulose matrix nanocomposite films. The properties of CC/GO nanocomposite films fabricated using simple solution-mixing method with different GO loadings were studied. Transmission electron microscope analysis showed the exfoliation of self-synthesized GO nanosheets within the CC matrix. X-ray diffraction results confirmed the crystalline structure of CC/GO films as the CC/GO mass ratio increased from 100/0 to 100/4...
September 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28606536/preparation-and-characterization-of-poly-maleic-acid-grafted-cross-linked-chitosan-microspheres-for-cd-ii-adsorption
#17
Zhenzhen Yu, Qifeng Dang, Chengsheng Liu, Dongsu Cha, Haifeng Zhang, Wenjing Zhu, Qianqian Zhang, Bing Fan
A novel adsorbent, composed of poly(maleic acid)-grafted cross-linked chitosan microspheres (PMACCMs), was prepared via cross-linking with glutaraldehyde and modification by grafting maleic acid. FTIR, zeta potential, elemental analysis, (13)C NMR, DTG, laser particle size analysis, SEM, and BET methods were applied to characterize PMACCMs, exhibiting a successful fabrication, good thermostability, and well-defined surface microstructure beneficial to Cd(II) adsorption. The effects of pH, contact time, and initial concentration on Cd(II) adsorption were also investigated, and the maximum adsorption capacity was 39...
September 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28606535/durable-flame-retardant-finishing-of-cotton-fabrics-with-halogen-free-organophosphonate-by-uv-photoinitiated-thiol-ene-click-chemistry
#18
Lijin Xu, Wei Wang, Dan Yu
Cotton fabrics are treated with a synthetic non-halogenated organophosphorus flame retardant by UV photoinitiated thiol-ene click chemistry. Thiol reactive precursors on cotton surface were prepared by 3-Mercaptopropyltriethoxysilane. The flame retardant property has been tested with different concentrations of flame retardant treatment (i.e., wt 2%, 5%, and 8%) by limited oxygen index (LOI) and vertical burning tests and maintained after 30 washing cycles, which was improved with concentration increases. Thermogravimetric analysis showed that the treatment greatly enhanced the char forming ability of cellulose and the highest residue was left as much as 48...
September 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28606534/ternary-polysaccharide-complexes-colloidal-drug-delivery-systems-stabilized-in-physiological-media
#19
Danjun Wu, Agathe Ensinas, Bernard Verrier, Armelle Cuvillier, Gaël Champier, Stephane Paul, Thierry Delair
Chitosan-hyaluronan (HYA) polyelectrolyte complexes (PECs) were designed to maintain their colloidal stabilities in physiological ionic strength and pH, via a new concept of ternary complexes. This strategy relied on the formation of a binary PEC between chitosan and a strong polyacid, dextran sulphate (DS) or heparin (HEP), and further functionalization with HYA. The major parameter leading to stabilized colloids was a high ratio of the degrees of polymerization of chitosan versus the strong polyacid. The process afforded either positive or negative particles when HYA was used in default or in excess (vs...
September 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28606533/study-of-a-new-biodegradable-hernia-patch-to-repair-abdominal-wall-defect-in-rats
#20
Jing Qiao, Zhiwen Jiang, Yan Yang, Jinhua Chi, Xuesong Qiao, Baoqin Han, Wanshun Liu
A novel biodegradable chitin hernia patch was prepared by acetylation of chitosan fabric in our study. Physicochemical properties, cell compatibility and biodegradability of the chitin patch were quantified. Histopathological study of the functional experiment showed that this newly designed hernia patch promoted collagen deposition and neovascularization by significantly promoting the secretion of FGF1 and TGF-β1 in the early postoperative (P<0.01). Chitin patch caused less inflammation by inhibiting excessive expression of IL-6 and TNF-α when compared to the polypropylene mesh (P<0...
September 15, 2017: Carbohydrate Polymers
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