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Carbohydrate Polymers

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https://www.readbyqxmd.com/read/28821158/synthesis-characterization-bioactivity-and-potential-application-of-phenolic-acid-grafted-chitosan-a-review
#1
REVIEW
Jun Liu, Huimin Pu, Shuang Liu, Juan Kan, Changhai Jin
In recent years, increasing attention has been paid to the grafting of phenolic acid onto chitosan in order to enhance the bioactivity and widen the application of chitosan. Here, we present a comprehensive overview on the recent advances of phenolic acid grafted chitosan (phenolic acid-g-chitosan) in many aspects, including the synthetic method, structural characterization, biological activity, physicochemical property and potential application. In general, four kinds of techniques including carbodiimide based coupling, enzyme catalyzed grafting, free radical mediated grafting and electrochemical methods are frequently used for the synthesis of phenolic acid-g-chitosan...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821157/in-situ-formation-of-injectable-and-porous-heparin-based-hydrogel
#2
Meeichyn Goh, Younghee Kim, Kihak Gwon, Kiyoon Min, YoungMin Hwang, Giyoong Tae
In this study, by combining photopolymerization and particle leaching technique, in situ formation of porous hydrogel with pore interconnectivity was demonstrated in vivo upon subcutaneous injection into the back of mice as well as in vitro. A precursor solution containing thiolated heparin, PEG-diacrylate (PEG-DA), and gelatin microparticles (GMPs) as a fast dissolving porogen were photopolymerized by visible-light-initiated thiol-ene reaction with eosin Y (EY) as a photo initiator and triethanolamine (TEOA) as a co-initiator...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821156/physicochemical-interactions-of-cycloamylose-with-phenolic-compounds
#3
Shin-Joung Rho, Saehun Mun, Jung Sun Hong, Young-Lim Kim, Ha V Do, Young-Wan Kim, Sang-Ik Han, Yong-Ro Kim
The complex formation capability of cycloamylose (CA), having a degree of polymerization of 23-45, with phenolic compounds (PCs) was investigated using various physicochemical techniques. The fluorescence intensity of PCs increased and then reached a plateau at 10-20mM cyclodextrin, while it continued to increase at up to 60mM CA. Thermodynamic data of CA complexes with PCs revealed that the binding process was primarily enthalpy-driven and spontaneous. CA favored to form the most stable complex with chlorogenic acid (CHA) among all PCs...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821155/simultaneous-influence-of-pectin-and-xyloglucan-on-structure-and-mechanical-properties-of-bacterial-cellulose-composites
#4
Monika Szymańska-Chargot, Monika Chylińska, Justyna Cybulska, Arkadiusz Kozioł, Piotr M Pieczywek, Artur Zdunek
The impact of the matrix polysaccharides on the cellulose microfibrils structure as well as on the mechanical properties of cell walls still remains an open question. Therefore, the aim of investigations was to determine the simultaneous influence of (i) different concentrations of pectins with constant concentration of xyloglucan, and (ii) different concentrations of xyloglucan with constant concentration of pectins on cellulose structure. Composites of bacterial cellulose (BC) produced by Komagataeibacter xylinus are considered to mimic natural plant cell walls...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821154/design-and-characterization-of-a-biocompatible-physical-hydrogel-based-on-scleroglucan-for-topical-drug-delivery
#5
Patrizia Paolicelli, Gabriele Varani, Settimio Pacelli, Elisa Ogliani, Martina Nardoni, Stefania Petralito, Alessandra Adrover, Maria Antonietta Casadei
Physical hydrogels of a high-carboxymethylated derivative of scleroglucan (Scl-CM300) were investigated as potential systems for topical drug delivery using three different therapeutic molecules (fluconazole, diclofenac and betamethasone). Rheological tests were carried out on drug-loaded hydrogels along with in-vitro release studies in a vertical Franz cell, in order to investigate if and how different drugs may influence the rheological and release properties of Scl-CM300 hydrogels. Experimental results and theoretical modeling highlighted that, in the absence of drug/polymer interactions (as for fluconazole and betamethasone) Scl-CM300 matrices offer negligible resistance to drug diffusion and a Fickian transport model can be adopted to estimate the effective diffusion coefficient in the swollen hydrogel...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821153/combination-of-microsized-mineral-particles-and-rosin-as-a-basis-for-converting-cellulosic-fibers-into-sticky-superhydrophobic-paper
#6
Xiaoyan Yu, Peiwen Bian, Yang Xue, Xueren Qian, Haipeng Yu, Wenshuai Chen, Xiaohai Hu, Peng Wang, Dong Wu, Qinghui Duan, Limei Li, Jing Shen, Yonghao Ni
The unique features of cellulosic paper including flexibility, biodegradability, and low cost enables it as a versatile, sustainable biomaterial for promising applications. In the paper industry, microsized mineral particles are widely used in the production of printing/writing paper grades, while rosin derived from trees is the earliest internal sizing agent for paper hydrophobication. On the basis of existing commercial practices associated with the use of mineral particles and rosin in paper production, we present a process concept of converting cellulosic fibers (paper-grade pulp) into "sticky" superhydrophobic paper involving the use of microsized mineral particles and rosin (a tree-derived natural product, mainly a mixture of resin acids, especially abietic acid with chemical formula of C19H29COOH)...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821152/the-common-lavender-lavandula-angustifolia-mill-pectic-polysaccharides-modulate-phagocytic-leukocytes-and-intestinal-peyer-s-patch-cells
#7
Yordan N Georgiev, Berit S Paulsen, Hiroaki Kiyohara, Milan Ciz, Manol H Ognyanov, Ondrej Vasicek, Frode Rise, Petko N Denev, Haruki Yamada, Antonin Lojek, Vesselin Kussovski, Hilde Barsett, Albert I Krastanov, Irina Z Yanakieva, Maria G Kratchanova
Two pectic (chPS-L1, chPS-L2) and one polyphenolic (chPP-L) fractions were obtained from lavender flowers after boiling water extraction, exhaustive removing of alcohol-soluble molecules and SEC. chPS-L1 (52.4kDa) contains mainly low-acetylated and high-methoxylated homogalacturonans (HG), and smaller rhamnogalacturonan (RG) I backbone fragments rich in 1,3,5-branched arabinan and arabinogalactan (AG) II side chains. chPS-L2 (21.8kDa) contains predominantly similarly esterified HG, followed by RGI with AGII structures and RGII...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821151/flexibility-of-backbone-fibrils-in-%C3%AE-chitin-crystals-with-different-degree-of-acetylation
#8
Zechuan Yu, Denvid Lau
Acetyl groups are backbone outreaches that enhance inter-fibril connection in chitin and chitosan fibril bundle. Removal of acetyl groups affects flexibility of chitosan fibril bundle, thereby affecting mechanical strength of chitosan-based products. Understandings of relationship between degree of acetylation and flexibility of chitin fibril bundle conduce to optimization of synthetic chitin materials. Here, the relationship is examined by performing molecular dynamics simulations. Coiling of chitin and chitosan fibril bundle with different degree of acetylation is observed and flexibility of fibrils is measured...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821150/functionalized-alginate-with-liquid-like-behaviors-and-its-application-in-wet-spinning
#9
Zhen Sang, Wenqian Zhang, Zhiyuan Zhou, Huakang Fu, Yeqiang Tan, Kunyan Sui, Yanzhi Xia
Alginate is a kind of marine-derived plant polysaccharide with useful properties including inherent flame-retardancy and biocompatibility, yet poor flowability and low processing efficiency induced by high viscosity impede its further industrial applications. In this study, PEG-substituted tertiary amines were adapted to functionalize alginate with different molecular weight via acid-base reaction to improve the flowability. Based on alginate with low molecular weight, alginate fluids exhibited excellent flowability at room temperature in the absence of solvent...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821149/solution-blow-spun-nanocomposites-of-poly-lactic-acid-cellulose-nanocrystals-from-eucalyptus-kraft-pulp
#10
Delne Domingos da Silva Parize, Juliano Elvis de Oliveira, Tina Williams, Delilah Wood, Roberto de Jesús Avena-Bustillos, Artur Piotr Klamczynski, Gregory Melvin Glenn, José Manoel Marconcini, Luiz Henrique Capparelli Mattoso
Cellulose nanocrystals (CNCs) were extracted from Eucalyptus kraft pulp by sulfuric acid hydrolysis, and esterified with maleic anhydride (CNCMA). The incorporation of sulfate ester groups on the cellulose surface resulted in higher stability of the nanoparticles in aqueous suspensions and lower thermal stability. Then, PLA/CNC and PLA/CNCMA nanocomposites were successfully obtained by solution blow spinning (SBS) using dimethyl carbonate (DMC) as solvent. CNC and CNCMA indicated to be acting both as nucleating agents or growth inhibitors of PLA crystal and tends to favor the formation of PLA crystals of higher stability...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821148/a-pectic-polysaccharide-from-ligusticum-chuanxiong-promotes-intestine-antioxidant-defense-in-aged-mice
#11
Chao Huang, Xiyue Cao, Xingfu Chen, Yuping Fu, Yingguo Zhu, Zhengli Chen, Qihui Luo, Lixia Li, Xu Song, Renyong Jia, Zhongqiong Yin, Bin Feng, Yuanfeng Zou
The extensive prospects of polysaccharides in medicine and pharmaceuticals have elicited much interest. Ligusticum chuanxiong polysaccharides, previously extracted as neutral polysaccharides, exhibit antioxidant, anticancer, andantibacterial capacities in vitro. Here we show one pectic polysaccharide extracted from rhizome of L. chuanxiong(LCP-II-I). Structural analysis indicated its long homogalacturonan region is interrupted by rhamnogalacturonan type I, with arabinan and arabinogalactan type I as side chains...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821147/uv-crosslinkable-and-thermo-responsive-chitosan-hybrid-hydrogel-for-nir-triggered-localized-on-demand-drug-delivery
#12
Lei Wang, Baoqiang Li, Feng Xu, Zheheng Xu, Daqing Wei, Yujie Feng, Yaming Wang, Dechang Jia, Yu Zhou
Innovative drug delivery technologies based on smart hydrogels for localized on-demand drug delivery had aroused great interest. To acquire smart UV-crosslinkable chitosan hydrogel for NIR-triggered localized on-demanded drug release, a novel UV-crosslinkable and thermo-responsive chitosan was first designed and synthesized by grafting with poly N-isopropylacrylamide, acetylation of methacryloyl groups and embedding with photothermal carbon. The UV-crosslinkable unit (methacryloyl groups) endowed chitosan with gelation via UV irradiation...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821146/evaluation-of-carboxymethyl-moringa-gum-as-nanometric-carrier
#13
Rimpy, Abhishek, Munish Ahuja
In the present study, carboxymethylation of Moringa oleifera gum was carried out by reacting with monochloroacetic acid. Modified gum was characterised employing Fourier-transform infrared spectroscopy, differential scanning calorimetry, X-ray diffraction, scanning electron microscopy, and Rheology study. The carboxymethyl modification of moringa gum was found to increase its degree of crystallinity, reduce viscosity and swelling, increase the surface roughness and render its more anionic. The interaction between carboxymethyl moringa gum and chitosan was optimised by 2-factor, 3-level central composite experimental design to prepare polyelectrolyte nanoparticle using ofloxacin, as a model drug...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821145/utilization-of-cotton-waste-for-regenerated-cellulose-fibres-influence-of-degree-of-polymerization-on-mechanical-properties
#14
Rasike De Silva, Nolene Byrne
Cotton accounts for 30% of total fibre production worldwide with over 50% of cotton being used for apparel. In the process from cotton bud to finished textile product many steps are required, and significant cotton waste is generated. Typically only 30% of pre consumer cotton is recycled. Here we use cotton waste lint to produce regenerated cellulose fibres (RCF). We find the RCF from waste cotton lint had increased mechanical properties compared to RCF produced from wood pulp. We show that this is likely linked to the higher degree of polymerization (DP) of waste cotton lint...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821144/extraction-purification-and-structural-characterization-of-a-galactoglucomannan-from-the-gabiroba-fruit-campomanesia-xanthocarpa-berg-myrtaceae-family
#15
Shayla Fernanda Barbieri, Andrea Caroline Ruthes, Carmen Lúcia de Oliveira Petkowicz, Rossana Catie Bueno de Godoy, Guilherme Lanzi Sassaki, Arquimedes Paixão Santana Filho, Joana Léa Meira Silveira
In this study, we isolated and structurally characterized, for the first time, a galactoglucomannan (GGM) from the pulp of gabiroba, a Myrtaceae family species. The HPSEC-MALLS-RI analysis showed a homogeneous polysaccharide with molar mass of 25,340gmol(-1). The monosaccharide composition showed that the GGM consisted of Man:Glc:Gal in a molar ratio of 1:1:0.6. Methylation and 1D and 2D NMR analyses suggested that the main chain of the GGM consisted of β-d-Glcp and β-d-Manp units (1→4)-linked. The α-d-Galp substitutions occur mainly at O-6 position of β-d-Manp units...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821143/nmr-spectroscopic-structural-characterization-of-a-water-soluble-%C3%AE-1%C3%A2-3-1%C3%A2-6-glucan-from-aureobasidium-pullulans
#16
Hiroyuki Kono, Nobuhiro Kondo, Katsuki Hirabayashi, Makoto Ogata, Kazuhide Totani, Shinya Ikematsu, Mitsumasa Osada
An unambiguous structural characterization of the water-soluble Aureobasidium pullulans β-(1→3, 1→6)-glucan is yet to be achieved, although this β-(1→3, 1→6)-glucan is expected to exhibit excellent biofunctional properties. Thus, we herein report the elucidation of the primary structure of the A. pullulans β-(1→3, 1→6)-glucan using nuclear magnetic resonance spectroscopy, followed by comparison of the obtained structure with that of schizophyllan (SPG). Structural characterization of the A. pullulans β-(1→3, 1→6)-glucan revealed that the structural units are a β-(1→3)-d-glucan backbone with four β-(1→6)-d-glucosyl side branching units every six residues...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821142/manufacture-of-requeij%C3%A3-o-cremoso-processed-cheese-with-galactooligosaccharide
#17
P C Belsito, M V S Ferreira, L P Cappato, R N Cavalcanti, V A S Vidal, T C Pimentel, E A Esmerino, C F Balthazar, R P C Neto, M I B Tavares, P B Zacarchenco, M Q Freitas, M C Silva, R S L Raices, G M Pastore, M A R Pollonio, A G Cruz
The addition of galactooligosaccharide, (GOS, 0, 1.5, 3 or 4g/100g) on the quality parameters of requeijão cremoso was investigated. Chemical characteristics (pH, moisture, fat and protein), color (L*, a*, b*), water mobility by TD- nuclear magnetic resonance, rheology (flow curve and oscillatory tests), microstructure and sensory acceptance (consumer test) were evaluated. The addition of GOS provided a denser and compact structure and reduced number and size of fat globules. Increased GOS level (3 and 4g/100g) improved the softness and spreadability (decrease of G', G″ and apparent viscosity and an increase of tan δ and melting index) and impacted positively on the aroma and taste of the requeijão cremoso...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821141/designed-biocompatible-nano-inhibitor-based-on-poly-%C3%AE-cyclodextrin-ester-for-reduction-of-the-dehp-migration-from-plasticized-pvc
#18
Ahmad Raeisi, Khalil Faghihi, Meisam Shabanian
The easy migration of di(2-ethylhexyl) phthalate (DEHP) from the plasticized PVC (P-PVC) poses a serious threat to human health and the ecosystems. Thus, its control migration from the P-PVC products is very important. In this work, a poly(β-cyclodextrin-ester) network (β-CDP) was synthesized via reaction of β-cyclodextrin with 3,3',4,4'-benzophenone tetracarboxylic dianhydride. As a potential inhibitor for reduction of the DEHP migration, the β-CDP was grafted to Fe3O4 nanoparticles. Poly(β-cyclodextrin-ester) functionalized Fe3O4 nanoparticles (MNP-CDP) has been used in PVC/DEHP system as a reactive nano-inhibitor to reduce DEHP migration...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821140/the-potential-of-cashew-gum-functionalization-as-building-blocks-for-layer-by-layer-films
#19
Álvaro J Leite, Rui R Costa, Ana M S Costa, Jeanny S Maciel, José F G Costa, Regina C M de Paula, João F Mano
Cashew gum (CG), an exudate polysaccharide from Anacardium occidentale trees, was carboxymethylated (CGCm) and oxidized (CGO). These derivatives were characterized by FTIR and zeta potential measurements confirming the success of carboxymethylation and oxidation reactions. Nanostructured multilayered films were then produced through layer-by-layer (LbL) assembly in conjugation with chitosan via electrostatic interactions or Schiff bases covalent bonds. The films were analyzed by QCM-D and AFM. CG functionalization increased the film thickness, with the highest thickness being achieved for the lowest oxidation degree...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821139/charge-functionalized-and-mechanically-durable-composite-cryogels-from-q-nfc-and-cs-for-highly-selective-removal-of-anionic-dyes
#20
Yufei Chen, Jing Ru, Biyao Geng, Haiying Wang, Congcong Tong, Chungui Du, Shengchun Wu, Hongzhi Liu
A composite cryogel was prepared from quaternized nanofibrillated cellulose (Q-NFC) and chitosan (CS) through a combination of freeze-drying and cross-linking with epichlorohydrin. The specific surface area of the composite cryogel was approximately two times that of Q-NFC cryogel. And the composite cryogel exhibited superior adsorption properties of anionic dyes than either the Q-NFC or CS cryogel controls. The adsorption isotherm well fitted the Langmuir model with the maximum theoretical adsorption capacity up to 473...
October 15, 2017: Carbohydrate Polymers
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