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Carbohydrate polymers 50건

  1. [해외논문]   Inside Front Cover  


    Carbohydrate polymers v.189 ,pp. IFC , 2018 , 0144-8617 ,

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  2. [해외논문]   Inside Front Cover   SCI SCIE


    Carbohydrate polymers v.189 ,pp. IFC - IFC , 2018 , 0144-8617 ,

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  3. [해외논문]   Synergistic effect of κ-carrageenan and gelatin blends towards adipose tissue engineering   SCI SCIE

    Tytgat, L. (Polymer Chemistry & Biomaterials Group—Centre of Macromolecular Chemistry (CMaC)—Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281, S4-Bis, 9000 Ghent, Belgium ) , Vagenende, M. (Polymer Chemistry & Biomaterials Group—Centre of Macromolecular Chemistry (CMaC)—Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281, S4-Bis, 9000 Ghent, Belgium ) , Declercq, H. (Tissue Engineering and Biomaterials—Department of Basic Medical Sciences, Ghent University, De Pintelaan 185, 6B3, 9000 Ghent, Belgium ) , Martins, J.C. (NMR and Structure Analysis Unit—Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281, S4-Bis, 9000 Ghent, Belgium ) , Thienpont, H. (Brussels Photonics (B-PHOT)—Department of Applied Physics and Photonics, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium ) , Ottevaere, H. (Brussels Photonics (B-PHOT)—Department of Applied Physics and Photonics, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussel) , Dubruel, P. , Van Vlierberghe, S.
    Carbohydrate polymers v.189 ,pp. 1 - 9 , 2018 , 0144-8617 ,

    초록

    Abstract The current paper focuses on the functionalization of κ-carrageenan and gelatin as extracellular matrix polysaccharide and protein mimic respectively to produce hydrogel films for adipose tissue engineering. More specifically, κ-carrageenan as well as gelatin have been functionalized with methacrylate and methacrylamide moieties respectively to enable subsequent UV-induced crosslinking in the presence of a photo-initiator. The gel fraction, the mass swelling ratio and the mechanical properties of both the one-component hydrogels and the protein/polysaccharide blends have been evaluated. The mechanical and swelling properties of the blends could be tuned by varying the hydrogel composition as well as the crosslinking method applied. The in vitro biocompatibility assays indicated a significantly higher cell viability of adipose tissue-derived mesenchymal stem cells seeded onto the blends as compared to the one-component hydrogels. The results show that the blends of gelatin and κ-carrageenan clearly outperform the one-component hydrogels in terms of adipose tissue engineering potential. Highlights Photo-crosslinked κ-carrageenan and gelatin hydrogel blends were obtained. Building block concentration and crosslinking method affect hydrogel properties. In vitro biocompatibility of the blends was superior over the individual hydrogels.

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  4. [해외논문]   Two structurally similar fucosylated chondroitin sulfates from the holothurian species Stichopus chloronotus and Stichopus horrens   SCI SCIE

    Ustyuzhanina, Nadezhda E. (Corresponding authors. ) , Bilan, Maria I. (Corresponding authors.) , Dmitrenok, Andrey S. , Shashkov, Alexander S. , Nifantiev, Nikolay E. , Usov, Anatolii I.
    Carbohydrate polymers v.189 ,pp. 10 - 14 , 2018 , 0144-8617 ,

    초록

    Abstract Two fucosylated chondroitin sulfates SC and SH were isolated from the holothurian species Stichopus chloronotus and Stichopus horrens , respectively. The molar ratio of monosaccharides and sulfate (GalNAc:GlcA:Fuc:SO 3 Na) was suggested as ∼1:1:1:4 for both polysaccharides. Really this theoretical ratio was slightly distorted by the presence of some fucan sulfate in both preparations (about 2% in SH and 10% in SC ), which could not be separated probably due to coincidence with the main components in charge density and molecular weight. The 1D and 2D NMR spectroscopic methods were applied for the detailed structural characterization of SC and SH , which were found to have similar structures. The main chain of SC and SH was shown to be composed of the repeating disaccharide units →4)-β- D -GlcA-(1 → 3)-β- D -GalNAc-(1→ sulfated at O-4 or both at O-4 and O-6 of the N-acetyl-galactosaminyl residues. The ratio of mono- and disulfated GalNAc residues was determined as 1:9 for SC and SH . Only one type of branches linked to O-3 of glucuronyl residues, namely fucosyl 2,4-disulfate residues, were found in both polysaccharides. Therefore polysaccharides SC and SH are two new examples of highly regular fucosylated chondroitin sulfates. Highlights The structures of two natural fucosylated chondroitin sulfates (FCS) were determined. The sea cucumbers Stichopus chloronotus and S. horrens were the sources of FCS. The backbone of the polysaccharides consists mainly of chondroitin sulfate E units. The only one type of Fuc2 S 4 S branches attached to O-3 of GlcA was found.

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  5. [해외논문]   Improved miscibility of PA6 and chitosan by the electric-field assisted phase inversion   SCI SCIE

    Zhang, Jingjing (Department of Polymer Science and Engineering, School of Material Science and Chemical Engineering, Ningbo University, Ningbo 315211, Zhejiang, PR China ) , Zhou, Qi (School of Materials and Chemical Engineering, Ningbo University of Technology, Ningbo 315016, Zhejiang, PR China ) , Li, Wei (Department of Polymer Science and Engineering, School of Material Science and Chemical Engineering, Ningbo University, Ningbo 315211, Zhejiang, PR China ) , Petrov, Oleg (Department of Technical Physics II, TU Ilmenau, PO Box 100565, D-98684 Ilmenau, Germany ) , Mattea, Carlos (Department of Technical Physics II, TU Ilmenau, PO Box 100565, D-98684 Ilmenau, Germany ) , Stapf, Siegfried (Department of Technical Physics II, TU Ilmenau, PO Box 100565, D-98684 Ilmenau, Germany)
    Carbohydrate polymers v.189 ,pp. 15 - 21 , 2018 , 0144-8617 ,

    초록

    Abstract A facile and efficient method for the improved miscibility of natural polymer/synthetic polymer blends is reported here based on the electric-field-driven phase inversion. We have employed bioderived chitosan (CS) and Polyamide-6 (PA6) as an example since their blends are known to always result in a large scale phase separation ( i.e. CS settles to the bottom of the blends as sediment) during phase inversion procedure. The condensed structure of the polymer blends has been well characterized, notably by the polarized attenuated total reflectance infrared spectroscopy and proton longitudinal relaxation time ( T 1 ) distribution. The application of an electric field can orient the polar groups which will hinder the crystallization of blends and also increase the interphase interaction between PA6 and CS. The miscibility of the PA6/CS blends has been characterized by scanning electron microscopy and confocal Raman spectroscopy. It is shown that this controllable hydrogen bonding environment, induced by the presence of electric field, indeed greatly hinder the sedimentation of CS without destroying its chemical structure. The improved miscibility of PA6/CS blends can thus significantly increase the toughness and generate a somewhat larger tensile strength. Highlights Miscibility of chitosan and polyamide is improved by the presence of electric field. Electric field orients the polar groups, adjusting the hydrogen bonding of blends. Toughness and tensile strength of blends both increase owing to the electric field. Graphical abstract [DISPLAY OMISSION]

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  6. [해외논문]   Tailor-made conductive inks from cellulose nanofibrils for 3D printing of neural guidelines   SCI SCIE

    Kuzmenko, Volodymyr (Wallenberg Wood Science Center, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden ) , Karabulut, Erdem (Wallenberg Wood Science Center, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden ) , Pernevik, Elin (Department of Chemistry and Chemical Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden ) , Enoksson, Peter (Wallenberg Wood Science Center, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden ) , Gatenholm, Paul (Wallenberg Wood Science Center, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden)
    Carbohydrate polymers v.189 ,pp. 22 - 30 , 2018 , 0144-8617 ,

    초록

    Abstract Neural tissue engineering (TE), an innovative biomedical method of brain study, is very dependent on scaffolds that support cell development into a functional tissue. Recently, 3D patterned scaffolds for neural TE have shown significant positive effects on cells by a more realistic mimicking of actual neural tissue. In this work, we present a conductive nanocellulose-based ink for 3D printing of neural TE scaffolds. It is demonstrated that by using cellulose nanofibrils and carbon nanotubes as ink constituents, it is possible to print guidelines with a diameter below 1 mm and electrical conductivity of 3.8 × 10 −1 S cm −1 . The cell culture studies reveal that neural cells prefer to attach, proliferate, and differentiate on the 3D printed conductive guidelines. To our knowledge, this is the first research effort devoted to using cost-effective cellulosic 3D printed structures in neural TE, and we suppose that much more will arise in the near future. Highlights A conductive ink for 3D printing is made of nanocellulose and carbon nanotubes. The ink is used to 3D print guidelines for neural tissue engineering. The conductivity of the printed guidelines is 3.8 × 10 −1 S cm −1 . Conductive guidelines direct and enhance neural cell development. Graphical abstract [DISPLAY OMISSION]

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  7. [해외논문]   Natural gum-type biopolymers as potential modified nonpolar drug release systems   SCI SCIE

    Salamanca, Constain H. (Universidad Icesi, Facultad de Ciencias Naturales, Programa de Maestría en Formulación de Productos Químicos y Derivados, Colombia ) , Yarce, Cristhian J. (Universidad Icesi, Facultad de Ciencias Naturales, Programa de Maestría en Formulación de Productos Químicos y Derivados, Colombia ) , Moreno, Roger A. (Departamento de Ciencias Farmacéuticas, Calle 18 No. 122 −135, Cali 760031, Colombia ) , Prieto, Vanessa (Departamento de Ciencias Farmacéuticas, Calle 18 No. 122 −135, Cali 760031, Colombia ) , Recalde, Juanita (Departamento de Ciencias Farmacéuticas, Calle 18 No. 122 −135, Cali 760031, Colombia)
    Carbohydrate polymers v.189 ,pp. 31 - 38 , 2018 , 0144-8617 ,

    초록

    Abstract In this work, the relationship between surface properties and drug release mechanism from binary composition tablets formed by quetiapine fumarate and biopolymer materials was studied. The biopolymers correspond to xanthan and tragacanth gums, which are projected as modified drug release systems. The surface studies were carried out by the sessile drop method, while the surface free energy (SFE) was determinate through Young-Dupree and OWRK semi-empirical models. On the other hand, the drug release studies were performed by in vitro dissolution tests, where the data were analyzed through kinetic models of zero order, first order, Higuchi, and Korsmeyer-Peppas. The results showed that depending on the type and the proportion of biopolymer, surface properties, and the drug release processes are significantly affected, wherein tragacanth gum present a usual erosion mechanism, while xanthan gum describes a swelling mechanism that controls the release of the drug. Highlights The tablet surface properties depend on the type of biopolymer used. Xanthan gum presents a gel formation in the tablet surface. Tragacanth gum describes an abrupt erosion mechanism. Only the xanthan gum shown an extended drug release similar to the reference product.

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  8. [해외논문]   A novel enzymatic approach to nanocrystalline cellulose preparation   SCI SCIE

    Beltramino, Facundo (Corresponding author.) , Blanca Roncero, M. , Vidal, Teresa , Valls, Cristina
    Carbohydrate polymers v.189 ,pp. 39 - 47 , 2018 , 0144-8617 ,

    초록

    Abstract In this work, conditions for an enzymatic pretreatment prior to NCC isolation from cotton linter were assessed. Different cellulase doses and reaction times were studied within an experimental design and NCC were obtained. At optimal enzymatic conditions (20U, 2 h), a total yield greater than 80% was achieved and the necessary enzymatic treatment time was reduced 90%. Different intensities of enzymatic treatments led to proportional decreases in fiber length and viscosity and also were inversely proportional to the amount of released oligosaccharides. These differences within fibers lead to quantitative differences in NCC: increase in acid hydrolysis yield, reduction of NCC surface charge and crystallinity increase. Benefits produced by enzymatic treatments did not have influence over other NCC characteristics such as their sulfur content (≈1%), size (≈200 nm), zeta potential (≈−50 mV) or degree of polymerization (≈200). Evidence presented in this work would reduce the use of harsh sulfuric acid generating a cleaner stream of profitable oligosaccharides. Highlights NCC were produced with a greener technology. Sulfuric acid can be reduced with a cellulase pretreatment. The optimal conditions for enzymatic treatment were established. The enzymatic treatment time was reduced. Enzymatic effects on fibers led to proportional differences in NCC.

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  9. [해외논문]   A comparative study of gelatin and starch-based nano-composite films modified by nano-cellulose and chitosan for food packaging applications   SCI SCIE

    Noorbakhsh-Soltani, S.M. (Corresponding author.) , Zerafat, M.M. , Sabbaghi, S.
    Carbohydrate polymers v.189 ,pp. 48 - 55 , 2018 , 0144-8617 ,

    초록

    Abstract Environmental concerns have led to extensive research for replacing polymer-based food packaging with bio-nano-composites. In this study, incorporation of nano-cellulose into gelatin and starch matrices is investigated for this purpose. Chitosan is used to improve mechanical, anti-fungal and waterproof properties. Experiments are designed and analyzed using response surface methodology. Nano-Cellulose is synthesized via acid hydrolysis and incorporated in base matrices through wet processing. Also, tensile strength test, food preservation, transparency in visible and UV and water contact angle are performed on the nano-composite films. DSC/TGA and air permeability tests are also performed on the optimal films. The results show that increasing nano-cellulose composition to 10% leads to increase the tensile strength at break to 8121 MN/m 2 and decrease the elongation at break. Also, increasing chitosan composition from 5% to 30% can enhance food preservation up to 15 days. Highlights NCC addition improves Modulus, transparency and food preservation. Chitosan enhancement improves preservation and transparency in gelatin films. Transparency and strength in gelatin films are higher compared with starch films. Increasing glycerol results in reduction of modulus and strength.

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  10. [해외논문]   A new biodegradable sisal fiber–starch packing composite with nest structure   SCI SCIE

    Xie, Qi (School of Mechanical Engineering, Key Laboratory of High Efficiency and Clean Mechanical Manufacture (Ministry of Education) Shandong University, Jinan 250061, China ) , Li, Fangyi (School of Mechanical Engineering, Key Laboratory of High Efficiency and Clean Mechanical Manufacture (Ministry of Education) Shandong University, Jinan 250061, China ) , Li, Jianfeng (School of Mechanical Engineering, Key Laboratory of High Efficiency and Clean Mechanical Manufacture (Ministry of Education) Shandong University, Jinan 250061, China ) , Wang, Liming (School of Mechanical Engineering, Key Laboratory of High Efficiency and Clean Mechanical Manufacture (Ministry of Education) Shandong University, Jinan 250061, China ) , Li, Yanle (School of Mechanical Engineering, Key Laboratory of High Efficiency and Clean Mechanical Manufacture (Ministry of Education) Shandong University, Jinan 250061, China ) , Zhang, Chuanwei (School of Mechanical Engineering, Key Laboratory of High Efficiency and Clean Mechanical Manufacture (Ministry of Education) Shandong University, Jinan 250061,) , Xu, Jie , Chen, Shuai
    Carbohydrate polymers v.189 ,pp. 56 - 64 , 2018 , 0144-8617 ,

    초록

    Abstract A new completely biodegradable sisal fiber–starch packing composite was proposed. The effects of fiber content and alkaline treatment on the cushioning property of the composites were studied from energy absorption efficiency, cellular microstructure and compatibility between fiber and starch. With increasing fiber content, the nest structure of composites becomes dense first and then loosens, resulting in initial enhancement and subsequent weakening of the cushioning property of the composites. The composite with 4:13 mass ratio of fiber and thermoplastic starch (TPS) exhibit the optimal cushioning property. Alkaline treatment increases the compatibility between sisal fiber and TPS, promotes the formation of dense nest structure, thereby enhances the cushioning property of the composites. After biodegradability tests for 28 days, the weight loss of the composites was 62.36%. It's found that the composites are a promising replacement for expandable polystyrene (EPS) as packing material, especially under large compression load (0.7–6 MPa). Highlights A biodegradable composite was proposed which can replace EPS as packing material. Cushioning property of composites improve as the density of nest structure increases. Nest structure becomes dense first and then loosens as the fiber content increases. Alkaline treatment promotes the formation of dense nest structure. Weight loss of the composite was 62.36% after biodegradability tests for 28 days.

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