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Carbohydrate Polymers

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https://www.readbyqxmd.com/read/30241868/thermal-decomposition-behaviors-and-kinetics-of-carrageenan-poly-vinyl-alcohol-bio-composite-film
#1
Fanrong Meng, Yijun Zhou, JunYu Liu, Jun Wu, Guoqing Wang, Ruisong Li, Yucang Zhang
Pyrolysis characteristics of carrageenan-polyvinyl alcohol (CG-PVA) composite films were studied on a thermo gravimetric analyzer in N2 atmosphere. A stepwise procedure based on model-free Flynn-Wall-Ozawa (FWO), Kissinger-Akahira-Sunose (KAS) and Friedman-Reich-Levi (FRL) methods were applied to calculate the apparent activation energies (E). The range of E for CG-PVA/LBP/K film was 16.92∼171.53 kJ/mol. Coats-Redfern and master-plots methods were utilized to investigate the most probable mechanisms for CG-PVA/LBP/K film...
December 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/30241867/study-of-green-nanocomposites-based-on-corn-starch-and-cellulose-nanofibrils-from-agave-tequilana-weber
#2
María Guadalupe Lomelí-Ramírez, Edgar Mario Valdez-Fausto, Maite Rentería-Urquiza, Rosa María Jiménez-Amezcua, José Anzaldo Hernández, Jose Guillermo Torres-Rendon, Salvador García Enriquez
Global environmental pollution issues caused by synthetic materials and the lack of practical utilization of the local industrial lignocellulosic waste, force Mexican researchers to produce new biobased sustainable materials that use industrial waste as a source of components. Herein, we show the preparation and characterization of environmentally friendly starch-based nanocomposites reinforced with cellulose nanofibrils (CNF) extracted from Agave tequilana Weber. Tensile, bending and impact mechanical properties of dried and hydrated nanocomposites were studied...
December 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/30241866/cell-interactions-and-cytotoxic-studies-of-cellulose-nanofibers-from-curau%C3%A3-natural-fibers
#3
Sivoney Ferreira Souza, Marcos Mariano, Dennys Reis, Christiane Bertachini Lombello, Mariselma Ferreira, Mohini Sain
Cellulose nanofibers (CNF) were isolated from Curauá fibers (Ananas erectifolius L. B. Smith) through a mechanical grinder preceded by mild chemical treatment. Morphology and surface characteristics of the fibers were followed until it reaches the nanoscale as long and flexible nanofibers. In aqueous suspensions, SAXS techniques revealed that such nanofibers present a twisted ribbon structure while rheological measurements demonstrate its high viscosity and a thixotropic behavior. These characteristics suggests the potential application of CNF in biomedical field, which, in turn, stimulates the toxicological studies of such materials...
December 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/30241865/antioxidative-and-hepatoprotective-effects-of-enzymatic-and-acidic-hydrolysis-of-pleurotus-geesteranus-mycelium-polysaccharides-on-alcoholic-liver-diseases
#4
Xinling Song, Zhonghai Liu, Jianjun Zhang, Chen Zhang, Yuhan Dong, Zhenzhen Ren, Zheng Gao, Min Liu, Huajie Zhao, Le Jia
The present work investigated the antioxidant and hepatoprotective effects of acidic- and enzymatic-hydrolysis mycelium polysaccharide (AcMPS and EnMPS) from Pleurotus geesteranus on alcoholic liver disease (ALD) mice. The animal studies demonstrated that the polysaccharides had potential effects reflected by remitting alcoholic hepatitis, reducing lipid accumulation, preventing oxidative stress, improving inflammatory symptoms, and alleviating the liver functions by histopathologic observation. Results showed that AcMPS (yield of 84%) was composed of L-Rha, D-Rib, L-Ara, D-Glc, D-Man and D-Gal with the Mw of 3...
December 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/30241864/a-pectin-from-fruits-of-lycium-barbarum-l-decreases-%C3%AE-amyloid-peptide-production-through-modulating-app-processing
#5
Lishuang Zhou, Wenfeng Liao, Hui Zeng, Yanli Yao, Xia Chen, Kan Ding
Here, a pectin LBP1C-2 with the molecular weight of 99.8 kDa was purified from fruits of Lycium barbarum L. Its structure was elucidated as a backbone of alternate 1, 2-linked α-Rhap and 1, 4-linked α-GalpA, with branches of terminal (T) -, 1, 3-, 1, 6- and 1, 3, 6-linked β-Galp, T-, 1, 5- and 1, 3, 5-linked α-Araf and T-linked β-Rhap substituted at C-4 of 1, 2, 4-linked α-Rhap. The cell-based experiments indicated that LBP1C-2 suppressed Aβ42 production in a dose-dependent manner with no cytotoxicity...
December 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/30241863/fucosylated-chondroitin-sulfate-oligosaccharides-from-isostichopus-badionotus-regulates-lipid-disorder-in-c57bl-6-mice-fed-a-high-fat-diet
#6
Shan Li, Junhui Li, Guizhu Mao, Yaqin Hu, Xingqian Ye, Ding Tian, Robert J Linhardt, Shiguo Chen
Fucosylated chondroitin sulfate (fCS) and its depolymerized derivative (DfCS), prepared from sea cucumbers, are well-known for their anticoagulant activity. However, their other functional activities are poorly understood. Recently, we obtained fCS oligosaccharides from Isostichopus Badionotus by a modified controllable Fenton-system, named as DfCS-Ib. The functional activities of these oligosaccharides are still unclear. The present study investigated anti-hyperlipidemic activity of DfCS-Ib using a high-fat diet (HFD)-fed mice model...
December 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/30241862/polysaccharide-from-fermented-momordica-charantia-l-with-lactobacillus-plantarum-ncu116-ameliorates-type-2-diabetes-in-rats
#7
He Gao, Jia-Jia Wen, Jie-Lun Hu, Qi-Xing Nie, Hai-Hong Chen, Tao Xiong, Shao-Ping Nie, Ming-Yong Xie
The influence of Lactobacillus plantarum-fermentation on the structure and anti-diabetic effects of Momordica charantia polysaccharides were evaluated. High-fat diet and streptozotocin-induced type 2 diabetic rats were administrated with polysaccharides from fermented and non-fermented Momordica charantia (FP and NFP) for 4 weeks. Fermentation affected the physicochemical characterization, monosaccharide composition, molecular weight, and viscosity of Momordica charantia polysaccharides. Treatment with FP significantly ameliorated hyperglycemia, hyperinsulinemia, hyperlipidemia, and oxidative stress in diabetic rats compared with NFP...
December 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/30241861/synthesis-of-cationic-alkylated-chitosans-and-an-investigation-of-their-rheological-properties-and-interaction-with-anionic-surfactant
#8
S J Burr, P A Williams, I Ratcliffe
Two methods were used to alkylate high MW chitosan with glycidyltrimethylammonium chloride (GTAC) in order to produce chitosan derivatives that are water-soluble throughout the pH range. In addition, a novel chitosan derivative was created by alkylating one of the products with the GTAC analogue Quab 342 containing C12 alkyl chains. The phase behaviour and rheological characteristics of the chitosan derivatives were studied in the presence of anionic surfactant. The derivatives were found to form soluble complexes at low and high SDS concentrations and that the Quab 342 derivative was able to form gels...
December 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/30241860/a-polysaccharide-from-eclipta-prostrata-alleviates-experimental-autoimmune-encephalomyelitis-through-inhibiting-th17-cells
#9
Ning Li, Songshan Shi, Feifei Yang, Hongwei Wang, Juan Su, Fei Huang, Hui Wu, Xiaojun Wu, Shunchun Wang
Eclipta prostrata has long been used as a medicinal herb in China. EAP20-1, a homogeneous polysaccharide with anti-complementary activity had been obtained from E. prostrate by using anion-exchange and size-exclusion chromatography. In this study, we found that EAP20-1 could inhibit in vitro lymphocyte proliferation stimulated by concanavalin-A or anti-CD3/anti-CD28 antibodies. Furthermore, in experimental autoimmune encephalomyelitis (EAE) mice, EAP20-1 treatment relieved the clinical symptoms, accompanied by reduced neuroinflammation and demyelination in spinal cords...
December 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/30241859/contrasting-effects-of-albumin-and-hydroxyethyl-starch-solutions-on-physical-properties-of-sodium-hyaluronate-solution
#10
Tsuneo Tatara
Hydroxyethyl starch (HES) solution reportedly sheds the endothelial surface layer (ESL) consisting of polysaccharide glycosaminoglycans, whereas albumin stabilizes the ESL. Here we compared the effects of albumin and HES (MW 130,000) solutions on the physical properties of sodium hyaluronate (NaHA, MW 1.3 × 106 ) solution, a constituent of the ESL. Partial specific volumes (v) and intrinsic viscosities ([η]) of NaHA in 0.15 M NaCl solution containing albumin or HES (1-3%) were calculated from densities and viscosities extrapolated at infinite dilutions...
December 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/30241858/effect-of-molecular-weight-of-hyaluronan-on-zein-based-nanoparticles-fabrication-structural-characterization-and-delivery-of-curcumin
#11
Shuai Chen, Yahong Han, Cuixia Sun, Lei Dai, Shufang Yang, Yang Wei, Like Mao, Fang Yuan, Yanxiang Gao
Zein and hyaluronan with different molecular weights (hyaluronic acid, HA and sodium hyaluronate, SHA: 100, 1000, and 2000 kDa) were used to fabricate the zein-hyaluronan (ZH) nanoparticles by the antisolvent coprecipitation method. With increasing molecular weight of hyaluronan, the particle size, zeta-potential, and turbidity were gradually increased. Zeta-potential and Fourier transform infrared spectroscopy (FTIR) results indicated that electrostatic attraction was the dominant driving force, followed by hydrogen bonding and hydrophobic effects...
December 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/30241857/tough-sticky-and-remoldable-hydrophobic-association-hydrogel-regulated-by-polysaccharide-and-sodium-dodecyl-sulfate-as-emulsifiers
#12
Siliang Li, Yang Gao, Haicheng Jiang, Lijie Duan, Guanghui Gao
Hydrophobic association hydrogels have been extensively studied during the past decades. However, the fracture stress of hydrophobic association hydrogels obtained with anionic surfactants (such as sodium dodecyl sulfate) achieved hundreds of Pascal. In this investigation, combined surfactants consisting of polysaccharide (gum arabic) and sodium dodecyl sulfate were utilized to stabilize hydrogels with high fracture stress of more than 1 MPa. Moreover, the hydrogels exhibited excellent self-healing capacity and remoldable behavior without any stimulation...
December 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/30241856/one-pot-fabrication-of-ph-reduction-dual-stimuli-responsive-chitosan-based-supramolecular-nanogels-for-leakage-free-tumor-specific-dox-delivery-with-enhanced-anti-cancer-efficacy
#13
Jiagen Li, Peng Liu
Facile one-pot approach was established to fabricate chitosan-based supramolecular nanogels as pH/reduction dual-stimuli responsive drug delivery system (DDS) for anticancer drug (doxorubicin, DOX), by bioreducible crosslinking of the β-cyclodextrin modified chitosan (CD-CS) with disulfide bond embedded crosslinker (Ad-SS-Ad) via host-guest inclusion and simultaneous DOX loading. The DOX@Ad-SS-Ad/CD-CS supramolecular nanogels with hydrodynamic diameter (Dh ) of 140 nm and drug-loading capacity of 15.9% were obtained with the mass feeding ratio of carrier:DOX at 25:10...
December 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/30241855/extracellular-depolymerisation-triggers-fermentation-of-tamarind-xyloglucan-and-wheat-arabinoxylan-by-a-porcine-faecal-inoculum
#14
Guangli Feng, Bernadine M Flanagan, Barbara A Williams, Deirdre Mikkelsen, Wenwen Yu, Michael J Gidley
Arabinoxylan (AX) and xyloglucan (XG) are important components of primary cell walls of cereal grains and vegetables/fruits, respectively. Despite the established health benefits of these non-starch polysaccharides, the mechanisms of their utilisation by the gut microbiota are poorly understood. In this study, the mechanisms of solubilised wheat AX and tamarind XG degradation were investigated under in vitro fermentation conditions using a porcine faecal inoculum. Through structural analysis of the polymers, we demonstrate that depolymerisation by microbial surface accessible endo-degrading enzymes occurs prior to active fermentation of AX or XG...
December 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/30241854/characterization-antioxidant-and-antiinflammation-of-mycelia-selenium-polysaccharides-from-hypsizygus-marmoreus-sk-03
#15
Min Liu, Wangjinsong Yao, Yongfa Zhu, Hui Liu, Jianjun Zhang, Le Jia
The synergistical action of inflammation response with oxidative stress has been reported to be response for the pathogenesis of lipopolysaccharide (LPS)-induced lung damage. In our present work, the antioxidative and anti-inflammatory efficacies of mycelia selenium polysaccharides (MSPS) from Hypsizigus marmoreus SK-03 in LPS-induced lung damaged mice, and its structure characterizations had been evaluated and analyzed. The animal investigations indicated that MSPS markedly ameliorated pulmonary injuries by the regulations of related inflammatory events via the observably antioxidant effects at the dose of 800 mg/kg...
December 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/30241853/a-heteropolysaccharide-from-saccharina-japonica-with-immunomodulatory-effect-on-raw-264-7-cells
#16
Lihua Geng, Weicheng Hu, Yingjuan Liu, Jing Wang, Quanbin Zhang
A heteropolysaccharide (SHP) with a strong immunomodulatory effect on RAW 264.7 cells was prepared from Saccharina japonica. Chemical analysis demonstrated that SHP was primarily composed of mannose, glucuronic acid, glucose, fucose, galactose, xylose and rahmnose with a molar ratio of 1.00:0.85:0.84:0.58:0.30:0.37:0.15. ESI-MS showed that depolymerized SHP produced oligo-glucuronan, oligo-glucuronomannan, sulfated fuco-oligosaccharides and other hetero-oligosaccharides. The in vitro immunomodulatory results showed that SHP could increase NO production and up-regulate the expression of many immune effectors, including iNOS, COX-2 and TNF-α, displaying an apparent immune enhancement activities...
December 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/30241852/effect-of-structure-features-of-polysaccharides-on-properties-of-dialdehyde-polysaccharide-tanning-agent
#17
Wei Ding, Ya-Nan Wang, Jianfei Zhou, Bi Shi
Sodium alginate (SA), tara gum (TG), starch (ST) and cyclodextrin (CD) were oxidized to dialdehyde polysaccharides (DAPs) using equivalent sodium periodate. The effects of polysaccharide structure features on aldehyde group content, molecular size and tanning performance of DAPs were investigated. Each DAP had abundant aldehyde groups (>7 mmol/g) for fur tanning in the experimental conditions, and DAP with higher aldehyde group content was obtained when polysaccharide with lower molecular weight and linear chain was used...
December 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/30241851/development-of-effective-nano-biosorbent-based-on-poly-m-phenylenediamine-grafted-dextrin-for-removal-of-pb-ii-and-methylene-blue-from-water
#18
Ehsan Nazarzadeh Zare, Moslem Mansour Lakouraj, Neda Kasirian
Novel nano-biosorbent was successfully prepared based on dextrin-g-poly m-phenylenediamine (DgPmPDA) and graphene oxide (GO) by using the solution blending technique and was found to be an effective adsorbent for Pb(II) and methylene blue (MB) dye. The nano-biosorbent was characterized by FTIR, CHN, XRD, SEM, AFM and TGA. The adsorption process depended on the pH of solution, adsorbent dosage, contact time, initial concentration of Pb(II) and MB, and temperature. Experimental results were in good agreement with Langmuir isotherm model for both Pb(II) and MB adsorption...
December 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/30241850/inhibition-of-leishmania-amazonensis-arginase-by-fucogalactan-isolated-from-agrocybe-aegerita-mushroom
#19
Renan Akio Motoshima, Tainara da F Rosa, Léia da C Mendes, Estefânia Viana da Silva, Sthefany R F Viana, Bruno Sérgio do Amaral, Dulce H F de Souza, Luciano M Lião, Maria de Lourdes Corradi da Silva, Lorena R F de Sousa, Elaine R Carbonero
The inhibition of arginase from Leishmania spp. is considered a promising approach to the leishmaniasis treatment. In this study, the potential of a fucogalactan isolated from the medicinal mushroom Agrocybe aegerita was evaluated against arginase (ARG) from Leishmania amazonensis. The polysaccharide was obtained via aqueous extraction, and purified by freeze thawing and precipitation with Fehling solution. Its chemical structure was established by monosaccharide composition, methylation analysis, partial acid hydrolysis, and NMR spectroscopy...
December 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/30241849/an-injectable-self-healing-hydrogel-with-adhesive-and-antibacterial-properties-effectively-promotes-wound-healing
#20
Honglei Chen, Junwen Cheng, Luoxiao Ran, Kun Yu, Bitao Lu, Guangqian Lan, Fangying Dai, Fei Lu
Hydrogels with self-healing capacity can undergo self-repair, establishing safer and longer-lasting products. Hydrogel wound dressings showing self-healing capacity can prolong the lifespan of the material and provide better wound protection. Therefore, in this study, Schiff base reactions (reversible imine linkages) were utilized to design injectable self-healing hydrogels with chitosan and konjac glucomannan. Oxidized konjac glucomannan was used to react with chitosan to form hydrogel. In addition to injectable, self-healing properties, the hydrogels also had adhesive and antibacterial properties, were biocompatible, and promoted wound healing...
December 1, 2018: Carbohydrate Polymers
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