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Carbohydrate Polymers

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https://www.readbyqxmd.com/read/28927632/extraction-preliminary-characterization-and-antioxidant-properties-of-polysaccharides-from-the-testa-of-salicornia-herbacea
#1
Hongjun Wang, Ziheng Xu, Xinguo Li, Jian Sun, Dan Yao, Hong Jiang, Tiezhong Zhou, Yingzi Liu, Jianguo Li, Chunqiang Wang, Wanbing Wang, Rufeng Yue
Response surface methodology and central composite design based on single-factor experiments were used to optimize the extraction parameters (i.e., extraction time, extraction temperature, and solid-liquid ratio) of polysaccharides from the testa of Salicornia herbacea (STP). The optimal conditions included a liquid-solid ratio of 57:1 (volume/mass), an extraction time of 300min and an extraction temperature of 87°C. Under these conditions, the maximal yield of crude STP was 1.30±0.06%, which agreed with model predictions...
November 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28927631/formulation-and-characterization-of-o-w-emulsions-stabilized-using-octenyl-succinic-anhydride-modified-kudzu-starch
#2
Yiguo Zhao, Nauman Khalid, Gaofeng Shu, Marcos A Neves, Isao Kobayashi, Mitsutoshi Nakajima
Kudzu starch esterified with octenyl succinic anhydride (OSA) was used as a food-grade emulsifier to formulate O/W emulsions. In addition, the difference between the physicochemical properties and emulsifying ability of native kudzu starch and those of OSA-modified kudzu starch was investigated. Granules of the OSA-modified kudzu starches increased in size after gelatinization. The interfacial tension between soybean oil and gelatinized OSA-modified kudzu starch was lower than that of kudzu starch. The droplet size of O/W emulsions decreased to 186nm at 100MPa after three passes...
November 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28927630/sustainable-thermoplastic-elastomers-derived-from-cellulose-fatty-acid-and-furfural-via-atrp-and-click-chemistry
#3
Juan Yu, Chuanwei Lu, Chunpeng Wang, Jifu Wang, Yimin Fan, Fuxiang Chu
Cellulose-based thermoplastic elastomers (TPEs) have attracted considerable attention because of their rigid backbone, good mechanical properties, renewable nature and abundance. In the present study, sustainable TPEs based on ethyl cellulose (EC), fatty acid and furfural were generated by the combination of ATRP and "click chemistry". To fabricate sustainable TPEs with higher toughness, a range of polymers, including mono random-copolymer poly(tetrahydrofurfuryl methacrylate-co-lauryl methacrylate) (P(THFMA-co-LMA), dual polymer side chains PTHFMA and PLMA, and mono-block copolymer PTHFMA-b-PLMA, were designed as side chains to fabricate EC brush copolymers with random, dual or block side chain architectures using the "grafting from" and "grafting onto" methods...
November 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28927629/insight-into-the-interaction-between-chitosan-and-bovine-serum-albumin
#4
Guo Li, Jianying Huang, Tao Chen, Xiangyang Wang, Haijiang Zhang, Qing Chen
Exploiting the uses of proteins and polysaccharides is of increasing interest because the combination of the attributes of these two types of biopolymers can produce small emulsion droplets with good physical stability. The objective of this study was to evaluate the effect of adding chitosan to a bovine serum albumin (BSA) solution at different pH values, and the consequent conformational changes were monitored using UV-vis absorption spectroscopy and fluorescence spectroscopy. Spectroscopic observations were further combined with rheological analysis results to illustrate the interaction mechanism...
November 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28927628/network-structure-and-functional-properties-of-transparent-hydrogel-sanxan-produced-by-sphingomonas-sanxanigenens-nx02
#5
Mengmeng Wu, Zhong Shi, Haidong Huang, Jianmei Qu, Xiaohui Dai, Xuefeng Tian, Weiying Wei, Guoqiang Li, Ting Ma
The micro-network structure and functional properties of sanxan, a novel polysaccharide produced by Sphingomonas sanxanigenens NX02, were investigated. Transparent hydrogel sanxan was a high acyl polymer containing 8.96% acetyl and 4.75% glyceroyl. The micro-network structure of sanxan was mainly cyclic configurations composed of side-by-side intermolecular associations, with many rounded nodes found. Sanxan exhibited predominant gelation behavior at concentrations above 0.1%, which was enhanced by adding cations, especially Ca(2+)...
November 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28927627/investigation-of-glycerol-concentration-on-corn-starch-morphologies-and-gelatinization-behaviours-during-heat-treatment
#6
Xu Chen, Li Guo, Xianfeng Du, Peirong Chen, Yishun Ji, Huili Hao, Xiaonan Xu
The effects of various glycerol concentrations (0%, 5%, 10%, 20%, and 50%, w/w) on the morphologies and gelatinization behaviours of corn starch were evaluated by confocal laser scanning microscopy (CLSM), scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and rapid visco-analyzer (RVA). When corn starch granules with no added glycerol were treated at 65°C, the granules of corn starch were almost completely broken and tightly connected, and the characteristic birefringence of the starch granules disappeared...
November 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28927626/digestibility-of-starches-isolated-from-stem-and-root-tubers-of-arracacha-cassava-cush-cush-yam-potato-and-taro
#7
Mighay Lovera, Elevina Pérez, Alexander Laurentin
Digestibility of arracacha, cassava, cush-cush yam, potato and taro starches was evaluated. In vitro (potentially-available starch and total resistant starch) and in vivo digestibility in the rice weevil (Sitophilus oryzae) bioassay (survival, weight variation, α-amylase like activity [ALA], and uric acid excretion [UAE] as biomarkers) were estimated. In in vitro assays, all starches presented high resistant starch content (14-56%, dry basis), except for cassava starch. In in vivo assays, cush-cush yam and potato starches promoted higher ALA (>3 times) and UAE (>4 times) compare to a reference diet (cornstarch), in agreement to their low digestibility...
November 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28927625/corrigendum-to-ph-responsive-polyurethane-core-and-cellulose-acetate-phthalate-shell-electrospun-fibers-for-intravaginal-drug-delivery-carbohydr-polym-151-2016-1240-1244
#8
Dawei Hua, Zhongche Liu, Fang Wang, Buhong Gao, Fei Chen, Qilu Zhang, Ranhua Xiong, Jingquan Han, Sangram Keshari Samal, Stefaan C De Smedt, Chaobo Huang
No abstract text is available yet for this article.
November 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28927624/investigation-of-lanthanum-impregnated-cellulose-derived-from-biomass-as-an-adsorbent-for-the-removal-of-fluoride-from-drinking-water
#9
Ammavasi Nagaraj, Kishor Kumar Sadasivuni, Mariappan Rajan
High concentrations of fluoride in drinking water can cause the disease fluorosis. Our scope goal is to develop an effective biopolymeric adsorbent for the removal of fluoride to below a specific safety limit set by the World Health Organization. In this study, the natural adsorbent material cellulose was impregnated with lanthanum chloride and effectiveness in adsorbing fluoride was confirmed by FT-IR, XRD, and SEM coupled with EDX techniques. The adsorption data were analyzed by Freundlich, Langmuir, and Redlich-Peterson isotherms...
November 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28927623/nanohybrid-hydrogels-of-laponite-pva-alginate-as-a-potential-wound-healing-material
#10
Nasim Golafshan, R Rezahasani, M Tarkesh Esfahani, M Kharaziha, S N Khorasani
The aim of this study was to develop a novel nanohybrid interpenetrating network hydrogel composed of laponite:polyvinyl alcohol (PVA)-alginate (LAP:PVA-Alginate) with adjustable mechanical, physical and biological properties for wound healing application. Results demonstrated that compared to PVA-Alginate, mechanical strength of LAP:PVA-Alginate significantly enhanced (upon 2 times). Moreover, incorporation of 2wt.% laponite reduced swelling ability (3 times) and degradation ratio (1.2 times) originating from effective enhancement of crosslinking density in the nanohybrid hydrogels...
November 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28927622/characterization-of-xylan-in-the-early-stages-of-secondary-cell-wall-formation-in-tobacco-bright-yellow-2-cells
#11
Tadashi Ishii, Keita Matsuoka, Hiroshi Ono, Mayumi Ohnishi-Kameyama, Katsuro Yaoi, Yoshimi Nakano, Misato Ohtani, Taku Demura, Hiroaki Iwai, Shinobu Satoh
The major polysaccharides present in the primary and secondary walls surrounding plant cells have been well characterized. However, our knowledge of the early stages of secondary wall formation is limited. To address this, cell walls were isolated from differentiating xylem vessel elements of tobacco bright yellow-2 (BY-2) cells induced by VASCULAR-RELATED NAC-DOMAIN7 (VND7). The walls of induced VND7-VP16-GR BY-2 cells consisted of cellulose, pectic polysaccharides, hemicelluloses, and lignin, and contained more xylan and cellulose compared with non-transformed BY-2 and uninduced VND7-VP16-GR BY-2 cells...
November 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28927621/in-vitro-degradation-and-possible-hydrolytic-mechanism-of-phbv-nanocomposites-by-incorporating-cellulose-nanocrystal-zno-nanohybrids
#12
Somia Yassin Hussain Abdalkarim, Hou-Yong Yu, Mei-Li Song, Ying Zhou, Juming Yao, Qing-Qing Ni
Fabrication and characterization of bbiodegradable nanocomposites based on poly (3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) matrix reinforced with cellulose nanocrystal (CNC)-ZnO nanohybrids via simple solution casting for possible use as antibacterial biomedical materials is reported. The obtained nanocomposites exhibited an excellent antibacterial ratio of 95.2-100% for both types of bacteria namely S. aureus and E. coli and showed 9-15% degradation after one week. The addition of CNC-ZnO showed a positive effect on hydrophilicity and barrier properties...
November 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28927620/addition-of-pullulan-to-trehalose-glasses-improves-the-stability-of-%C3%AE-galactosidase-at-high-moisture-conditions
#13
Naomi Teekamp, Yu Tian, J Carolina Visser, Peter Olinga, Henderik W Frijlink, Herman J Woerdenbag, Wouter L J Hinrichs
Incorporation of therapeutic proteins in a matrix of sugar glass is known to enhance protein stability, yet protection is often lost when exposed to high relative humidity (RH). We hypothesized that especially in these conditions the use of binary glasses of a polysaccharide and disaccharide might yield advantages for protein stability. Therefore, different amounts of the polysaccharide pullulan were introduced in freeze-dried trehalose glasses. In these homogeneous blends, the presence of pullulan above 50 weight % prevented crystallization of trehalose when exposed to high RH...
November 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28927619/investigation-of-accessibility-and-reactivity-of-cellulose-pretreated-by-ionic-liquid-at-high-loading
#14
Takatsugu Endo, Ei Mon Aung, Shunsuke Fujii, Shota Hosomi, Mitsugu Kimizu, Kazuaki Ninomiya, Kenji Takahashi
High loading of cellulose in ionic liquid (IL) pretreatment is potentially a key technique for cellulose conversion to glucose in biorefining. In this work, to expand the potential use of this high loading technique, the accessibility of microcrystalline cellulose pretreated with an IL across a wide cellulose loading range (5-50mol%) and its relationship with the hydrolytic reactivity were comprehensively investigated. The results show that the estimated cellulose accessibility based on the crystallinity and specific surface area was notably higher in 25mol% loading than that for a conventional loading of 5mol%...
November 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28927618/geraniol-grafted-chitosan-oligosaccharide-as-a-potential-antibacterial-agent
#15
Lin Yue, Jingru Li, Wanwen Chen, Xiaoli Liu, Qixing Jiang, Wenshui Xia
The novel derivatives of geraniol grafted chitosan oligosaccharide were synthesized via substitution and deprotection reaction, respectively. The products were identified by Fourier transform infrared (FT-IR), (1)H nuclear magnetic resonance (NMR), X-ray diffraction analysis (XRD), Thermogravimetric analysis (TGA) and UV-vis absorption spectroscopy. It is revealed that the derivatives exhibited a good solubility, thermal stability and antibacterial properties.
November 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28927617/comparative-study-of-the-effect-of-starches-from-five-different-sources-on-the-rheological-properties-of-gluten-free-model-doughs
#16
Duqin Zhang, Taihua Mu, Hongnan Sun
We investigated the effect of wheat (WS), corn (CS), tapioca (TS), sweet potato (SS) and potato (PS) starches on the rheological properties of starch-hydroxypropylmethylcellulose (HPMC) model doughs. Significant differences were found among model doughs made with different starches in terms of water absorption, development time, and strength. The PS-HPMC dough presented higher maximum creep compliance, followed successively by SS-, TS-, CS-, and WS-HPMC doughs, and the same order was found for the degree of dependence of G' on frequency sweep, suggesting that the resistance to deformation depends on network structure stability...
November 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28927616/functionalization-of-cotton-fabrics-with-plasmonic-photo-active-nanostructured-au-tio2-layer
#17
M Abid, S Bouattour, A M Ferraria, D S Conceição, A P Carapeto, L F Vieira Ferreira, A M Botelho do Rego, M Rei Vilar, S Boufi
A simple approach to functionalize cotton fabrics with Au and TiO2 nanostructured layer is presented. Hybrid fabrics (Cot-Au-TiO2) are prepared through reduction of AuCl4(-) on cotton, followed by a non-aqueous sol-gel procedure using tetrabutyltitanate and a hydrothermal treatment at 110°C. The generation of crystalline TiO2 is confirmed by Raman spectroscopy. The fibres morphology and their roughness are characterized by AFM and FE-SEM. XPS shows how the concentration of the NPs precursors (Au and TiO2) affects the layer composition...
November 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28927615/green-thermal-assisted-synthesis-and-characterization-of-novel-cellulose-mg-oh-2-nanocomposite-in-peg-naoh-solvent
#18
Nikolai Ponomarev, Eveliina Repo, Varsha Srivastava, Mika Sillanpää
Synthesis of nanocomposites was performed using microcrystalline cellulose (MCC), MgCl2 in PEG/NaOH solvent by a thermal-assisted method at different temperatures by varying time and the amount of MCC. Results of XRD, FTIR, and EDS mapping showed that the materials consisted of only cellulose (CL) and magnesium hydroxide (MH). According to FTIR and XRD, it was found that crystallinity of MH in cellulose nanocomposites is increased with temperature and heating time and decreased with increasing of cellulose amount...
November 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28927614/fast-microwave-assisted-green-synthesis-of-xanthan-gum-grafted-acrylic-acid-for-enhanced-methylene-blue-dye-removal-from-aqueous-solution
#19
Edwin Makhado, Sadanand Pandey, Philiswa N Nomngongo, James Ramontja
In the present project, graft polymerization was employed to synthesis a novel adsorbent using acrylic acid (AA) and xanthan gum (XG) for cationic methylene dye (MB(+)) removal from aqueous solution. The XG was rapidly grafted with acrylic acid (CH2=CHCOOH) under microwave heating. Fourier-transform infrared spectroscopy (FTIR), Proton Nuclear magnetic resonance spectroscopy ((1)H NMR), scanning electron microscopy (SEM), X-ray diffraction (XRD) and Thermal gravimetric analysis (TGA) techniques were used to verify the adsorbent formed under optimized reaction conditions...
November 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28927613/physicochemical-transformation-of-rice-straw-after-pretreatment-with-a-deep-eutectic-solvent-of-choline-chloride-urea
#20
Mingzhu Pan, Guomin Zhao, Chunxiang Ding, Bing Wu, Zhina Lian, Hailan Lian
This study focused on the pretreatment with deep eutectic solvent of choline chloride (ChCl)/urea mixtures on rice straw and its chemical fractions of holocellulose, α-cellulose, and acid-insoluble-lignin (AIL). The pretreatment of ChCl/urea was significantly affected by the treated temperature prior to the treated time, and 130°C and 4h was an optimum condition for ChCl/urea pretreatment. The separation capacity of ChCl/urea on the chemical fractions was in an order of AIL (22.87%)> hemicellulose and amorphous cellulose (16...
November 15, 2017: Carbohydrate Polymers
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