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Carbohydrate Polymers

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https://read.qxmd.com/read/30732786/development-and-physical-chemical-properties-of-pectin-film-reinforced-with-spent-coffee-grounds-by-continuous-casting
#1
J F Mendes, J T Martins, A Manrich, A R Sena Neto, A C M Pinheiro, L H C Mattoso, M A Martins
The ever-growing environmental concerns over the unrestricted fossil sources exploitation for non-biodegradable materials production has stimulated research on alternative renewable resources. The pectin films (HDM) were incorporated in different concentrations of spent coffee grounds (SCG) (5-20% w/w HDM) aiming at developing biodegradable films and the use of an underutilized resource. The films were obtained by continuous casting. The chemical composition, morphology, thermal stability, barrier and mechanical properties (traction and puncture), and functional groups were investigated...
April 15, 2019: Carbohydrate Polymers
https://read.qxmd.com/read/30732785/layer-by-layer-immobilization-of-amphoteric-carboxymethyl-chitosan-onto-biocompatible-silk-fibroin-nanofibrous-mats
#2
Hu Tu, Guomin Wu, Yang Yi, Mengtian Huang, Rong Liu, Xiaowen Shi, Hongbing Deng
Novel antimicrobials with well biocompatibility are urgently needed for human public health protecting. Here, the silk fibroin (SF) nanofibrous mats coated with carboxymethyl chitosan (CMC), both extracted from natural polymers, were fabricated by combining electrospinning and electrostatic layer-by-layer (LBL) self-assembly techniques. The amphoteric CMC could be easily adsorbed on the surface of SF nanofibers due to the electrostatic interaction, which were a highly efficient and "green" route for the surface modification of SF mats...
April 15, 2019: Carbohydrate Polymers
https://read.qxmd.com/read/30732784/enzymatic-hydrolysis-of-cellulose-nanoplatelets-as-a-source-of-sugars-with-the-concomitant-production-of-cellulose-nanofibrils
#3
Leonardo Chávez-Guerrero, Julio Silva-Mendoza, Selene Sepúlveda-Guzmán, Norberto Alan Medina-Aguirre, Sofia Vazquez-Rodriguez, María Elena Cantú-Cárdenas, Nora Aleyda García-Gómez
Cellulose, the most abundant biopolymer on earth, is produced at different ratios by all land plants. Since the morphology and crystallinity of cellulose are key factors involved in its enzymatic hydrolysis, in the present work, we tackled the study of the effects of such variables on the nanocellulose conversion into glucose. Cellulase from Trichoderma sp at 37 °C was used to produce glucose, the best results were found for the cellulose nanoplatelets (S-CNP) after 60 h of hydrolysis, which afforded a conversion of 47% to glucose, in contrast to 15% for the non-purified sample (W-CP) and 22% for microcrystalline cellulose (MCC20) used as control...
April 15, 2019: Carbohydrate Polymers
https://read.qxmd.com/read/30732783/characterization-of-polysaccharide-fractions-from-fruit-of-actinidia-arguta-and-assessment-of-their-antioxidant-and-antiglycated-activities
#4
Rugang Zhu, Xinyu Zhang, Yu Wang, Lijiao Zhang, Jing Zhao, Gang Chen, Jungang Fan, Youfeng Jia, Fengwen Yan, Chong Ning
A novel cell-wall polysaccharides (AAPs) were extracted from the fruits of Actinidia arguta and separated into four parts which were named water-eluted polysaccharide (WPS), salt-eluted polysaccharide (SPS)-1, SPS-2 and SPS-3. The monosaccharide composition and structural analysis showed that SPS-3 and SPS-2 were homogalacturonan (HG)-rich pectin, SPS-1 was rhamnogalacturonan (RG)-rich pectin and WPS was starch-like polysaccharides. All four kinds of polysaccharides displayed the ability to scavenge free radicals, chelate iron ion, inhibit lipid peroxidation and inhibit protein glycation, but SPS was obviously stronger than WPS...
April 15, 2019: Carbohydrate Polymers
https://read.qxmd.com/read/30732782/preparation-of-malto-oligosaccharides-with-specific-degree-of-polymerization-by-a-novel-cyclodextrinase-from-palaeococcus-pacificus
#5
Hangyan Ji, Yuxiang Bai, XiaoXiao Li, Jinpeng Wang, Xueming Xu, Zhengyu Jin
An open reading frame from Palaeococcus pacificus was discovered by genomic analysis. The recombinant PpCD was proved as novel extremely thermal-stable cyclodextrinase with potential on production of malto-oligosaccharides with specific degree of polymerization. This enzyme has extremely high substrate specificity toward cyclodextrins, while the rates of hydrolysis toward macromolecular or linear substrates such as starch, pullulan and amylose were pretty slow. The optimal pH and temperature of PpCD were determined as 6...
April 15, 2019: Carbohydrate Polymers
https://read.qxmd.com/read/30732781/study-of-chitosan-with-different-degrees-of-acetylation-as-cardboard-paper-coating
#6
Mariane Gatto, Deise Ochi, Cristiana Maria Pedroso Yoshida, Classius Ferreira da Silva
The biodegradability of chitosan is significant for packaging systems. Another relevant property of chitosan is its degree of acetylation (DA), which affects other properties, such as crystallinity and hydrophobicity. The DA can be modulated by chitin deacetylation or even chitosan reacetylation. The novelty of this paper is the application of reacetylated chitosan as a coating for cardboard paper surfaces to improve the barrier and mechanical properties of the paper. Chitosan with 2% DA was reacetylated to yield chitosan with 48% DA...
April 15, 2019: Carbohydrate Polymers
https://read.qxmd.com/read/30732780/formulation-of-pickering-sunflower-oil-in-water-emulsion-stabilized-by-chitosan-stearic-acid-nanogel-and-studying-its-oxidative-stability
#7
Majid Atarian, Ahmad Rajaei, Meisam Tabatabaei, Afshin Mohsenifar, Hojatolah Bodaghi
The aim of this study was to obtain a stable sunflower oil-in-water (O/W) Pickering emulsion stabilized by chitosan (CS)-stearic acid (SA) nanogels and to compare the oxidative stability of the sunflower Pickering emulsion stabilized by CS-SA nanogels with sunflower oil emulsion stabilized by Tween 80. The results of the scanning electron microscopy revealed that by increasing the SA to CS ratio, the uniformity of particles was increased. Also, the results showed that the emulsions with pH of 8, SA to CS ratio of 0...
April 15, 2019: Carbohydrate Polymers
https://read.qxmd.com/read/30732779/fabrication-and-characterization-of-starch-based-nanocomposites-reinforced-with-montmorillonite-and-cellulose-nanofibers
#8
Jiali Li, Mi Zhou, Geng Cheng, Fei Cheng, Yi Lin, Pu-Xin Zhu
In this study, one-dimensional (1D) cellulose nanofibers (CNFs) were used to stabilize the dispersion of two-dimensional (2D) montmorillonite (MMT) plates in aqueous system. Then the prepared MMT/CNF solution was simultaneously merged into water soluble corn starch (CS) to obtain CS/MMT/CNF composite freestanding films through a casting method. The reinforcing effect from building blocks of MMT and CNF, interfacial interactions of hydrogen and covalent bonding together led to enhanced tensile strength and Young's modulus, reduced moisture susceptibility and increased transparency of the ternary CS nanocomposites...
April 15, 2019: Carbohydrate Polymers
https://read.qxmd.com/read/30732778/polysaccharides-as-potential-anticancer-agents-a-review-of-their-progress
#9
REVIEW
Tabassum Khan, Amrita Date, Hardik Chawda, Krina Patel
Cancer is one of the most common diseases seen in developed countries, with over 1.6 million new cases estimated in 2017, in the US alone. The current chemotherapeutic drugs available for the therapeutic management of cancer are associated with major adverse effects like alopecia, anemia, immunodeficiency, fatigue, peripheral neuropathy, fertility issues and neurological problems, to name a few of them. Polysaccharides have emerged as potential chemical entities exhibiting good anticancer activity across a variety of cancer cell lines and can be developed as alternatives of existing cancer chemotherapeutic agents, possessing selective activity against tumor cells with minimal toxic side-effects...
April 15, 2019: Carbohydrate Polymers
https://read.qxmd.com/read/30732777/influence-of-nanocellulose-on-in-vitro-digestion-of-whey-protein-isolate
#10
Lingling Liu, Fanbin Kong
Three types of nanocellulose (NC), namely cellulose nano-fibrils (CNF), TEMPO-oxidized CNF and cellulose nanocrystals (CNC), were studied in terms of their effects on in vitro digestion of whey protein isolate (WPI). The behavior of NC itself during digestion was monitored by particle size, confocal microscopy imaging, viscosity, and zeta potential. 1% CNF and 4% CNC significantly retarded free amino nitrogen (FAN) diffusion (23% and 50% respectively) mainly due to high viscosity. 4% CNC also significantly reduced %FAN release during intestinal digestion...
April 15, 2019: Carbohydrate Polymers
https://read.qxmd.com/read/30732776/barley-%C3%AE-glucan-accelerates-wound-healing-by-favoring-migration-versus-proliferation-of-human-dermal-fibroblasts
#11
N P Fusté, M Guasch, P Guillen, C Anerillas, T Cemeli, N Pedraza, F Ferrezuelo, M Encinas, M Moralejo, E Garí
β-Glucans are considered candidates for the medication in different human pathologies. In this work, we have purified β-glucan from a selected barley line and tested their effects in primary human dermal fibroblasts. Unexpectedly, we have observed that this compound promoted a short-transitory proliferation arrest at 24 h after its addition on the medium. We have determined that this transitory arrest was dependent on the cell-cycle regulator protein Retinoblastoma. Moreover, dermal fibroblasts increase their migration capacities at 24 h after barley β-glucan addition...
April 15, 2019: Carbohydrate Polymers
https://read.qxmd.com/read/30732775/ph-responsive-poly-xanthan-gum-g-acrylamide-g-acrylic-acid-hydrogel-preparation-characterization-and-application
#12
Meixia Zheng, Fengli Lian, Yujing Zhu, Yi Zhang, Bo Liu, Longtao Zhang, Baodong Zheng
Poly (xanthan gum-g-acrylamide-g-acrylic acid) (XGDA) hydrogel was prepared by grafting acrylamide (AM) and partly neutralized acrylic acid (AA) onto xanthan gum (XG) with trimethylolpropane triglycidyl ether as a cross-linking agent. With the introduction of amino and carboxyl groups by AM and AA, the XG molecules were rearranged with better regularity, leading to higher thermal stability and a more porous structure. The resulting hydrogel exhibited excellent performance in Cu (II)-adsorption and possessed sensitivity to external pH stimuli...
April 15, 2019: Carbohydrate Polymers
https://read.qxmd.com/read/30732774/fast-responsive-photo-switchable-dual-color-fluorescent-cyclodextrin-nanogels-for-cancer-cell-imaging
#13
Pengpeng Deng, Jing Sun, Juanjuan Chen, Xueqing Zou, Liqiong Liao
Photo-switchable dual-color fluorescent nanogels were fabricated via nanoprecipitation in aqueous solution. The spiropyran-modified β-cyclodextrin (β-CD-SP) and 4-amino-7-nitro-1,2,3-benzoxadiazole (NBDNH2 ) were encapsulated into nanogels in the presence of 1,6-hexamethylene diisocyanate (HMDI). In the nanogels, spiropyran moiety acted as fluorescence molecule acceptors under the irradiation of UV or visible light to quench or recover the fluorescence of the NBDNH2 to achieve reversible dual-color fluorescence...
April 15, 2019: Carbohydrate Polymers
https://read.qxmd.com/read/30732773/cationic-cellulose-nanofibers-as-sustainable-flocculant-and-retention-aid-for-reconstituted-tobacco-sheet-with-high-performance
#14
Haoyue Liu, Zhong Liu, Lanfeng Hui, Hongbin Liu, Pengtao Liu, Fangdong Zhang, Xingye An, Yangbing Wen, Shijie Wu
The study that cationic cellulose nanofibers (CCNF) acts as sustainable flocculant and retention aid of precipitated calcium carbonate (PCC) for the preparation of reconstituted tobacco sheet (RTS) was carried out, thanks to the properties of CCNF. In this work, the enhanced flocculation, reflocculation and size properties of PCC flocs induced by CCNF were investigated via a focused beam reflectance measurement (FBRM) system. The physical properties of RTS such as bulk and air permeability etc. were also studied...
April 15, 2019: Carbohydrate Polymers
https://read.qxmd.com/read/30732772/synergistic-clearance-of-intracellular-pathogens-by-hyaluronan-streptomycin-micelles-encapsulated-with-rapamycin
#15
Yuanhao Qiu, Chunbo Lu, Peng Chen, Feifei Sun, Dongdong Wang, Zhaojie Wang, Chunyan Hou, Haibo Mu, Jinyou Duan
Many pathogenic bacteria can invade phagocytic and non-phagocytic cells and colonize inside, which protects them from the attack by host immune system and antibiotics. A novel amphiphilic molecule was synthesized through conjugation of streptomycin and decylamine to hyaluronan. Rapamycin was encapsulted by the spontaneous self-assembly of hyaluronan-based amphiphilic molecules. The newly formed micelles not only facilitated the entry of drugs into host cells in part via CD44 phagocytic receptor, released streptomycin in the acidic compartment, but also could activate autophagy...
April 15, 2019: Carbohydrate Polymers
https://read.qxmd.com/read/30732771/stimuli-responsive-cellulose-paper-materials
#16
REVIEW
Zhijian Li, Xiaohan Yang, Wei Li, Hanbin Liu
Cellulose paper derived from plants has served as a carrier of cultural inheritance since it was invented 2000 years ago. It attracted more and more attentions in recent years working as a versatile platform to develop functional materials because of its good flexibility, sustainability, biodegradability, low cost and great capability to be modified. Once be functionalized, such as modified with stimuli-responsive polymers, small molecules or inorganic particles, papers may be sensitive to external stimuli from environments and consequently find applications in wide ranges including protein separation, controlled drug release, switchable surfaces, sensoring devices and smart substrates with various colors, etc...
April 15, 2019: Carbohydrate Polymers
https://read.qxmd.com/read/30732770/changes-in-the-physicochemical-properties-of-barley-and-oat-starches-upon-the-use-of-environmentally-friendly-oxidation-methods
#17
Magdalena Kurdziel, Maria Łabanowska, Sławomir Pietrzyk, Joanna Sobolewska-Zielińska, Marek Michalec
In this work, two environmentally friendly modification methods, UV irradiation and thermal treatment, were applied for the first time for modifications of oat and barley starches. Their impacts on starch properties were compared with those observed for starch oxidation with NaClO. XRD, EPR, FTIR, SEM and SEC methods were used to characterize the effects of modifications on starch structures. The decreases in molecular weight and crystallinity degree showed the destruction of starch structures upon prolonged UV irradiation and thermal treatment, more advanced in barley starch...
April 15, 2019: Carbohydrate Polymers
https://read.qxmd.com/read/30732769/study-on-the-wet-web-strength-and-pressability-of-paper-sheet-during-the-press-process-with-the-addition-of-nano-fibrillated-cellulose-nfc
#18
Zonghong Lu, Xingye An, Hao Zhang, Min Guan, Jing Liu, Yiwei Sun, Shuangxi Nie, Haibing Cao, Bin Lu, Hongbin Liu
The properties of wet-web strength and pressability of base paper affect the frequency of sheet breaks and machine runnability during the paper-making process. In this paper, the effect of nano-fibrillated cellulose (NFC) on the wet-web strength and pressability of paper sheet during the press process of paper-making was explored. It was found that the tensile energy absorption (TEA) of the sample was increased from 6.32 to 10.93 J/m2 at 50% wet web solid content when 5% NFC was added. The web solid content was decreased from 50...
April 15, 2019: Carbohydrate Polymers
https://read.qxmd.com/read/30732768/contribution-of-different-state-of-adsorbed-water-to-the-sub-t-g-dynamics-of-cellulose
#19
Hao Zhao, Zhen Chen, Xianfeng Du, Lin Chen
The contribution of different states of adsorbed water to the sub-Tg dynamics of cellulose was investigated by means of dielectric spectroscopy in couple with LF-NMR. The distribution and hydration state of adsorbed water in cellulose were determined by LF-NMR, based on which the role that different state of adsorbed water plays in typical secondary dielectric relaxations is discussed in detail. The variation of the dynamic characteristics of these relaxations suggested that three states of bound water present in moist cellulose, including tightly bound, non-freezable loosely bound, and freezable loosely bound water...
April 15, 2019: Carbohydrate Polymers
https://read.qxmd.com/read/30732767/a-green-composite-hydrogel-based-on-cellulose-and-clay-as-efficient-absorbent-of-colored-organic-effluent
#20
Qiyang Wang, Yixiang Wang, Lingyun Chen
This work has developed a convenient way of constructing wood cellulose and clay green composite hydrogel as efficient adsorbent of colored organic effluent. The optimized cellulose/montmorillonite(MTM) hydrogels showed excellent methylene blue (MB) absorption with the maximum capacity of adsorption (Qmax ) of 277 mg/g, which is not only higher than MTM alone, but also higher than many other natural clay composite adsorbents. Adsorption mechanism and kinetic studies that the physisorption was a major processing in MB absorption and the adsorption mainly occurred in the internal structure of composite hydrogel...
April 15, 2019: Carbohydrate Polymers
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