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Carbohydrate Polymers

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https://www.readbyqxmd.com/read/29773403/synthesis-of-chitin-glucan-aldehyde-quercetin-conjugate-and-evaluation-of-anticancer-and-antioxidant-activities
#1
Anu Singh, P K Dutta, Hridyesh Kumar, Amit Kumar Kureel, Ambak Kumar Rai
In the present study, we have synthesized chitin-glucan-aldehyde-quercetin (chi-glu-ald-que) conjugate via condensation reaction. Synthesis of chitin-glucan-aldehyde (chi-glu-ald) complex was facilitated by the oxidation of chitin-glucan (chi-glu) complex. Formation of conjugate was confirmed by Proton nuclear magnetic resonance spectroscopy (1 H NMR) and Fourier-transform infrared spectroscopy (FT-IR). Morphological studies showed that after grafting of quercetin, several changes on surface were depicted and a more crystalline nature was observed...
August 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29773402/hydroxypropylmethyl-cellulose-hpmc-crosslinked-chitosan-ch-based-scaffolds-containing-bioactive-glass-bg-and-zinc-oxide-zno-for-alveolar-bone-repair
#2
Rabia Zeeshan, Zeeshan Mutahir, Haffsah Iqbal, Moazzam Ali, Farasat Iqbal, Kashif Ijaz, Faiza Sharif, Asma Tufail Shah, Aqif Anwar Chaudhry, Muhammad Yar, Shifang Luan, Ather Farooq Khan, Ihtesham-Ur-Rehman
The success of a dental implant relies on the presence of an optimal alveolar ridge. The aim of this study was to fabricate HPMC crosslinked chitosan based scaffolds for alveolar bone repair. Our results indicated that HPMC crosslinked CH/BG foams presented better morphological structure (132-90.5 μm) and mechanical responses (0.451 MPa with 100 mg BG) as confirmed by SEM analysis and fatigue testing respectively. Cytotoxicity analysis at day 2, 4 and 8 demonstrated that all composites were non-toxic and supported cellular viability...
August 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29773401/optimization-of-orodispersible-and-conventional-tablets-using-simplex-lattice-design-relationship-among-excipients-and-banana-extract
#3
Sureewan Duangjit, Pakorn Kraisit
The objective of this study was focused on the optimization of the pharmaceutical excipients and banana extract in the preparation of orally disintegrating banana extract tablets (OD-BET) and conventional banana extract tablets (CO-BET) using a simplex lattice design. Various ratios of banana extract (BE), dibasic calcium phosphate (DCP) and microcrystalline cellulose (MCC) were used to prepare banana extract tablets (BET). The results indicated that the optimal OD-BET and CO-BET consisted of BE: DCP: MCC at 10...
August 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29773400/synthesis-of-novel-cellulose-based-antibacterial-composites-of-ag-nanoparticles-metal-organic-frameworks-carboxymethylated-fibers
#4
Chao Duan, Jingru Meng, Xinqi Wang, Xin Meng, Xiaole Sun, Yongjian Xu, Wei Zhao, Yonghao Ni
A novel cellulose-based antibacterial material, namely silver nanoparticles@ metal-organic frameworks@ carboxymethylated fibers composites (Ag NPs@ HKUST-1@ CFs), was synthesized. The results showed that the metal-organic frameworks (HKUST-1) were uniformly anchored on the fiber's surfaces by virtue of complexation between copper ions in HKUST-1 and carboxyl groups on the carboxymethylated fibers (CFs). The silver nanoparticles (Ag NPs) were immobilized and well-dispersed into the pores and/or onto the surfaces of HKUST-1 via in situ microwave reduction, resulting in the formation of novel Ag NPs@ HKUST-1@ CFs composites...
August 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29773399/dual-physically-crosslinked-healable-polyacrylamide-cellulose-nanofibers-nanocomposite-hydrogels-with-excellent-mechanical-properties
#5
Jiabao Niu, Jianquan Wang, Xiaofu Dai, Ziqiang Shao, Xiaonan Huang
To develop healable hydrogels with excellent mechanical properties is still a challenge topic. In this study, a novel class of physically crosslinked polyacrylamide based nanocomposite hydrogels reinforced with cellulose nanofibers (CNF) were fabricated using radical polymerization, followed by further strengthening through ferric ions via strong ionic coordination interactions between Fe3+ and carboxyls on CNF surfaces. Then the obtained gels were characterized by FTIR, tensile and compressive measurements as well as healing experiments...
August 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29773398/sulfated-polysaccharide-mediated-tgf-%C3%AE-1-presentation-in-pre-formed-injectable-scaffolds-for-cartilage-tissue-engineering
#6
Neha Ashok Waghmare, Aditya Arora, Arijit Bhattacharjee, Dhirendra S Katti
In this work, a plant-derived polysaccharide carboxymethylcellulose (CMC) was chemically modified to incorporate sulfate groups to facilitate binding of cationic growth factors. The sulfated CMC (heparin mimic) was then used with CMC (glycosaminoglycan mimic) and gelatin (collagen mimic) to fabricate injectable pre-formed, macroporous scaffolds for cartilage tissue engineering. These scaffolds demonstrated high resilience and shape memory, thereby making them injectable through a 14G needle for up to 4-6 aspiration and injection cycles...
August 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29773397/self-healable-tough-supramolecular-hydrogels-crosslinked-by-poly-cyclodextrin-through-host-guest-interaction
#7
Tingting Cai, Shuangjun Huo, Tao Wang, Weixiang Sun, Zhen Tong
A new supramolecular hydrogel with superior self-healing and shape memory properties was synthesized via in-situ copolymerization of the adamantane-containing monomer N-adamantylacrylamide (Ad-AAm) and monomer acrylic acid (AAc) in the polycyclodextrin (PCD) aqueous solution, where PCD served as the polyfunctional physical cross-linker. The PCD-Ad hydrogels showed strength of 40 kPa with breaking strain of 600%, but small tensile loading-unloading hysteresis and residual deformation benefited from the reversible crosslinking structure...
August 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29773396/synthesis-of-xylan-carbonates-an-approach-towards-reactive-polysaccharide-derivatives-showing-self-assembling-into-nanoparticles
#8
Martin Gericke, Lars Gabriel, Katja Geitel, Stefan Benndorf, Poonam Trivedi, Pedro Fardim, Thomas Heinze
Xylan phenyl carbonate (XPC) derivatives were prepared and characterized comprehensively. By conversion of xylan with phenyl chloroformate either in dipolar aprotic solvents with LiCl or in an ionic liquid, XPC with degrees of substitution (DS) of up to 2.0, i.e., fully functionalized derivatives, could be obtained. The synthesis was studied with respect to the influence of different reaction parameters. It was found that the reaction medium as well as the type of starting xylan strongly affected the efficiency of the derivatization...
August 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29773395/x-ray-powder-diffraction-and-other-analyses-of-cellulose-nanocrystals-obtained-from-corn-straw-by-chemical-treatments
#9
C C Hernandez, F F Ferreira, D S Rosa
The extraction of nanocellulose from agro-industrial wastes is feasible due to a significant amount of cellulose contained in these natural fibers. The analysis of chemical treatments effects on the fibers to obtain the nanocellulose must be taken into consideration for the definition of an adequate and efficient methodology. In this study, two alkaline treatments were used (cleaning and bleaching), as well as an acid treatment for the extraction of nanocellulose from corn straw residues. The samples were characterized using Fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRPD), scanning electron microscopy (SEM), dynamic light scattering (DLS) and atomic force microscopy (AFM) to verify the action and modifications caused in their chemical and physical structures...
August 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29773394/grafting-of-steroids-to-hyaluronan-towards-the-design-of-delivery-systems-for-antioxidants-the-role-of-hydrophobic-core
#10
Gloria Huerta-Ángeles, Martina Brandejsová, Jaroslav Novotný, Kateřina Kopecká, Jana Šógorková, Daniela Šmejkalová, Vladimír Velebný
In this work, amphiphilic hyaluronic acid (HA) was synthesized by the chemical bonding of steroids. Particularly, succinyl cholesterol (SCH), cholic acid (CA), deoxycholic acid (DOCA), and 18β-glycyrrhetinic acid (GA) were activated by benzoyl chloride towards the esterification reaction of HA in water. The degree of substitution can be controlled by varying the feed ratio of mixed anhydride to HA and up to 25% (mol/mol) can be obtained. Due to mild reaction conditions, no degradation of the polysaccharide was observed...
August 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29773393/comparative-study-of-physicochemical-properties-and-bioactivity-of-hericium-erinaceus-polysaccharides-at-different-solvent-extractions
#11
Jing-Kun Yan, Zhi-Chao Ding, Xianli Gao, Yao-Yao Wang, Yan Yang, Di Wu, He-Nan Zhang
In this study, hot water, 0.9% NaCl, citric acid, and 1.25 M NaOH/0.05% NaBH4 were separately used for the extraction of water-soluble H. erinaceus polysaccharides (HEPs; HEP-W, HEP-S, HEP-C, and HEP-A) from the fruit body of Hericium erinaceus. The physicochemical properties and biological activities were then investigated and compared. Results showed that the extraction solvents exhibited significant effects on the extraction yields, molecular weights, monosaccharide compositions, preliminary structural characteristics, microstructures of HEPs and on their contents, such as neutral sugar, uronic acid, protein, and β-(1 → 3)-glucan...
August 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29773392/design-of-reusable-novel-membranes-based-on-bacterial-cellulose-and-chitosan-for-the-filtration-of-copper-in-wastewaters
#12
Leire Urbina, Olatz Guaresti, Jesús Requies, Nagore Gabilondo, Arantxa Eceiza, Maria Angeles Corcuera, Aloña Retegi
This study has been carried out to design novel, environmentally friendly membranes by in situ and ex situ routes based on bacterial cellulose (BC) as a template for the chitosan (Ch) as functional entity for the elimination of copper in wastewaters. Two routes led to bionanocomposites with different aspect and physico-chemical properties. The mechanical behaviour in wet state, strongly related to crystallinity and water holding capacity, resulted to be very different depending on the preparation route although the Ch content was very similar: 35 and 37 wt% for the in situ and ex situ membranes, respectively...
August 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29773391/biohybrid-cellulose-fibers-toward-paper-materials-with-wet-strength-properties
#13
Gino Mangiante, Pierre Alcouffe, Marianne Gaborieau, Elisa Zeno, Michel Petit-Conil, Julien Bernard, Aurélia Charlot, Etienne Fleury
Herein, we report on the preparation of novel cellulose-PEG biohybrid papers with wet strength properties. The biohybrid paper sheets are obtained using a two-step procedure where ω- or α, ω-azide functionalized PEG chains are anchored onto alkyne-functionalized wood fibers through CuAAC ligation in mild and aqueous conditions. The incorporation of the PEG grafts mostly occurs at the periphery of the cellulose fibers and degrees of substitution up to 0.028 are obtained. The presence of PEG grafts significantly increases the tensile, burst and tear strength properties in the wet state, the reinforcement being more pronounced for fibers grafted with α,ω-azide PEG...
August 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29773390/structural-coloration-of-chitosan-coated-cellulose-fabrics-by-electrostatic-self-assembled-poly-styrene-methyl-methacrylate-acrylic-acid-photonic-crystals
#14
Gönül Yavuz, Andrea Zille, Necdet Seventekin, Antonio P Souto
The structural coloration of a chitosan-coated woven cotton fabric obtained by glutaraldehyde-stabilized deposition of electrostatic self-assembled monodisperse and spherically uniform (250 nm) poly (styrene-methyl methacrylate-acrylic acid) photonic crystal nanospheres (P(St-MMA-AA)) was investigated. Bright iridescent coatings displaying different colors in function of the viewing angle were obtained. The SEM, diffuse reflectance spectroscopy, TGA, DSC and FTIR analyses confirm the presence of structural color and the glutaraldehyde and chitosan ability to provide durable chemical bonding between cotton fabric and photonic crystal (PCs) coating with the highest degradation temperature and the lowest enthalpy...
August 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29773389/dynamic-high-pressure-microfluidization-assisting-octenyl-succinic-anhydride-modification-of-rice-starch
#15
Yu-Ting Li, Ri-Si Wang, Rui-Hong Liang, Jun Chen, Xiao-Hong He, Rui-Yun Chen, Wei Liu, Cheng-Mei Liu
Octenyl succinic anhydride (OSA) modified starch is widely used in food industries. In this study, rice starch (RS) was pretreated by dynamic high-pressure microfluidization (DHPM) and subsequently modified by OSA. The influence of DHPM on OSA modification of rice starch was investigated. Results showed that DHPM pretreatment enhanced the degree of substitution by changing the morphology and crystallinity of rice starch. Compared with the rice starch modified by OSA without DHPM pretreatment (OSA-RS), the DHPM-pretreated OSA starch (DHPM-OSA-RS) presented higher peak viscosity and lower pasting temperature...
August 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29773388/a-unique-polysaccharide-containing-3-o-methylarabinose-and-3-o-methylgalactose-from-tinospora-sinensis
#16
Shipra Nagar, Andreas Hensel, Petra Mischnick, Vineet Kumar
Tinospora sinensis (Lour.) Merrill is of great therapeutic significance in Indian traditional medicine. Crude polysaccharides were isolated from methanol pre-extracted stems of dried material by successive extractions with cold water, hot water and NaOH (0.25 mol/L) in 0.98, 0.55 and 0.70 % yields respectively. Cold water soluble polysaccharides (CWSP) were purified and fractionated by ion exchange chromatography on DEAE-Sephacel. Neutral polysaccharides were further fractionated on Sepharose CL6B to yield three fractions TW1, TW2, TW3...
August 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29773387/levan-based-fibrous-scaffolds-electrospun-via-co-axial-and-single-needle-techniques-for-tissue-engineering-applications
#17
Gülben Avsar, Deniz Agirbasli, Mehmet Ali Agirbasli, Oguzhan Gunduz, Ebru Toksoy Oner
This represents the first systematic study where levan polysaccharide was used to fabricate fibrous matrices by co-axial and single-needle electrospinning techniques. For this, hydrolyzed (hHL) and sulfated hydrolyzed (ShHL) Halomonas levan were chemically synthesized and used together with polycaprolactone (PCL) and polyethyleneoxide (PEO) for the spinning process. In co-axially spun matrices, ultimate tensile strength (UTS) were found to increase with increasing ShHL concentration and elongation at break of PCL + ShHL matrices increased up to ten-fold when compared to PCL matrices...
August 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29773386/electroconductive-3d-polymeric-network-production-by-using-polyaniline-chitosan-based-hydrogel
#18
Celil Ulutürk, Neslihan Alemdar
Herein, polyaniline/chitosan(PANI/CTS)-based electroconductive hydrogel was produced by photocrosslinked network in which CTS was used as a main component. Firstly, glycidyl methacrylate (GMA) was grafted on the CTS backbone to form CTS-g-GMA. Then, a three-dimensional polymeric network consisting of CTS-g-GMA and poly(ethylene glycol)diacrylate (PEGDA) was obtained by using photocrosslinking technique. At last, aniline monomer solution prepared by utilizing three different aniline concentrations (0.08, 0.16 and 0,32 M) was absorbed into (CTS-g-GMA)-PEGDA crosslinked structure to form [(CTS-g-GMA)-PEGDA]-PANI electroconductive semi interpenetrating network...
August 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29773385/studies-on-the-hepatoprotective-effect-of-fucoidans-from-brown-algae-kjellmaniella-crassifolia
#19
Shu Liu, Qiukuan Wang, Yuefan Song, Yunhai He, Dandan Ren, Haihua Cong, Long Wu
For illustrating the relation of different structural characteristics correlated with the hepatoprotective effect, studies of fucoidan from algae Kjellmaniella crassifolia, a brown alga distributed in north Japan, were carried out. The fucoidan fractions of K. crassifolia were extracted, separated, and purified using a combinatorial procedure consisting of enzymolysis, ethanol precipitation, DEAE and size-exclusion chromatographies. The fundamental characteristics of the four enriched fucoidan fractions (KF1-KF4), including their sulphate content and monosaccharide composition, were investigated...
August 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29773384/thermal-conformational-and-rheological-properties-of-%C3%AE%C2%BA-carrageenan-sodium-stearoyl-lactylate-gels-and-solutions
#20
M C Ortiz-Tafoya, Agnès Rolland-Sabaté, Catherine Garnier, Josefina Valadez-García, Alberto Tecante
Polysaccharide-surfactant blends are widely used in foods. However, their possible mutual interactions have not been extensively studied. The purpose of this work was to examine how the anionic surfactant sodium stearoyl lactylate (SSL) affects different properties of κ-carrageenan solutions and gels. Rheometry, differential scanning calorimetry, asymmetrical flow field-flow fractionation coupled with multiangle laser light scattering, among others, were used to determine the flow and viscoelastic behavior, thermal transitions, and conformation changes, respectively...
August 1, 2018: Carbohydrate Polymers
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