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https://www.readbyqxmd.com/read/29684676/fabrication-of-nanofibrous-microcarriers-mimicking-extracellular-matrix-for-functional-microtissue-formation-and-cartilage-regeneration
#1
Yansen Wang, Xueling Yuan, Kun Yu, Haoye Meng, Yudong Zheng, Jiang Peng, Shibi Lu, Xiaotong Liu, Yajie Xie, Kun Qiao
Cartilage has rather limited capacities for self-repair and regeneration. To repair complexly shaped cartilage tissue defects, we propose the application of microtissues fabricated from bone marrow-derived mesenchymal stem cells (BMSCs) cultured in natural bionic nanofibrous microcarriers (NF-MCs). The NF-MCs were structurally and functionally designed to mimic natural extracellular matrix (ECM) by crosslinking dialdehyde bacterial cellulose (DBC) with DL-allo-hydroxylysine (DHYL) and complexing chitosan (CS) with DHYL through electrostatic interactions...
April 16, 2018: Biomaterials
https://www.readbyqxmd.com/read/29684453/novel-aminohydrazide-cross-linked-chitosan-filled-with-multi-walled-carbon-nanotubes-as-antimicrobial-agents
#2
Nadia A Mohamed, Nahed A Abd El-Ghany
Four chemically modified chitosan derivatives 1-4 were designed and synthesized via a series of four reactions; first by reaction with benzaldehyde to protect its amino groups (Derivative 1), second by reaction with epichlorohydrine (Derivative 2), third by reaction with aminobenzhydrazide (Derivative 3), and forth by removing of benzaldehyde to restore the free amino groups on the chitosan (Derivative 4). Two multi-walled carbon nanotube (MWCNT) biocomposites based on Derivative 4 were also prepared. The structure of the prepared derivatives and MWCNT composites was elucidated using elemental analyses, FTIR, XRD, SEM and TEM...
April 20, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29684450/simultaneous-adsorption-of-cu-2-and-acid-fuchsin-af-from-aqueous-solutions-by-cmc-bentonite-composite
#3
Ning Gong, Yanping Liu, Ruihua Huang
Carboxymethyl-chitosan (CMC)/bentonite composite was prepared by the method of membrane-forming, and characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) techniques. The simultaneous adsorption of Cu2+ and Acid fuchsin (AF) applying CMC/bentonite composite as an adsorbent in single or binary systems was investigated. The adsorption study was conducted systematically by varying the ratio of CMC to bentonite, adsorbent dosage, initial pH value, initial Cu2+ (or AF) concentration, contact time and the interaction of two components in binary solutions...
April 20, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29682995/efficacy-and-safety-of-the-combination-of-isosorbide-dinitrate-spray-and-chitosan-gel-for-the-treatment-of-diabetic-foot-ulcers-a-double-blind-randomized-clinical-trial
#4
Sylvia Elena Totsuka Sutto, Yunuen Itzet Rodríguez Roldan, Ernesto German Cardona Muñoz, Teresa Arcelia Garcia Cobian, Sara Pascoe Gonzalez, Abril Martínez Rizo, Miriam Mendez Del Villar, Leonel García Benavides
AIM: To evaluate whether a combination of isosorbide dinitrate spray and chitosan gel (10%) topically applied can have additive benefits for management of diabetic foot ulcers. METHODS: In a randomized, placebo-controlled, double-blinded clinical trial, 68 patients were divided into four groups: Group 1: treated with chitosan gel; Group 2: isosorbide dinitrate spray; Group 3: combination of isosorbide dinitrate spray and chitosan gel; Group 4: placebo. RESULTS: Histological analyses showed a significant regeneration in all groups ( p < 0...
April 1, 2018: Diabetes & Vascular Disease Research
https://www.readbyqxmd.com/read/29682895/electrophoretic-deposited-stable-chitosan-mos-2-coating-with-rapid-in-situ-bacteria-killing-ability-under-dual-light-irradiation
#5
Zizhou Feng, Xiangmei Liu, Lei Tan, Zhenduo Cui, Xianjin Yang, Zhaoyang Li, Yufeng Zheng, Kelvin Wai Kwok Yeung, Shuilin Wu
Developing in situ disinfection methods in vivo to avoid drug-resistant bacteria and tissue toxicity is an urgent need. Here, the photodynamic and photothermal properties of the chitosan-assisted MoS2 (CS@MoS2 ) hybrid coating are simultaneously inspired to endow metallic Ti implants with excellent surface self-antibacterial capabilities. This coating, irradiated by only 660 nm visible light (VL) for 10 min, exhibits an antibacterial efficacy of 91.58% and 92.52% against Escherichia coli (E. coli) and Staphylococcus aureus (S...
April 22, 2018: Small
https://www.readbyqxmd.com/read/29681683/the-influence-of-filler-type-on-the-separation-properties-of-mixed-matrix-membranes
#6
Małgorzata Gnus, Gabriela Dudek, Roman Turczyn
Chitosan-based membranes filled with different metal oxide particles were prepared and their performance in ethanol dehydration process depending on the type of oxide and loading was discussed. For membrane preparation three oxides: TiO2 , Cr2 O3 or Fe3 O4 were selected. From experimental data suitable ethanol and water transport coefficients were evaluated. As shown in the results, applied fillers in different ways affect the separation properties. Presence of TiO2 significantly affects the normalized total flux, increasing its value...
2018: Chemické Zvesti
https://www.readbyqxmd.com/read/29680504/supplementing-capsaicin-with-chitosan-based-films-enhanced-the-anti-quorum-sensing-antimicrobial-antioxidant-transparency-elasticity-and-hydrophobicity
#7
Lalehan Akyuz, Murat Kaya, Muhammad Mujtaba, Sedef Ilk, Idris Sargin, Asier M Salaberria, Jalel Labidi, Yavuz S Cakmak, Cemil Islek
In the current study, capsaicin, a plant alkaloid with high antioxidative, anti-inflammatory, antiobesity, anticancer and analgesic properties, was used in the film technology for the first time. In the same regard, chitosan (as a versatile animal-based polymer) was blended with capsaicin at three different concentrations to obtain edible films. The produced films were characterized by FT-IR, SEM, and DSC. Mechanical, transmittance, hydrophobicity, anti-quorum sensing, antimicrobial and antioxidant properties were also examined...
April 19, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29680503/chitosan-tailored-lipidic-nanoconstructs-of-fusidic-acid-as-promising-vehicle-for-wound-infections-an-explorative-study
#8
Kanika Thakur, Gajanand Sharma, Bhupinder Singh, Sanjay Chhibber, A B Patil, Om Prakash Katare
The current research study intends to explore the combined potential of lipid nanoparticles and chitosan as an optimum therapy for the management of wound infections. Fusidic acid (FA), a steroidal antibiotic employed for treatment of primary and secondary topical infections was encapsulated within the nanoengineered lipid-polymer hybrid nanoparticles (FA-LPHNs). A number of variables like lipid/polymer ratio, lipid, surfactant and chitosan concentration, stirring speed were optimized to get the desired particle size and % entrapment efficiency...
April 19, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29680502/evaluation-of-hyaluronic-acid-combined-ternary-complexes-for-serum-resistant-and-targeted-gene-delivery-system
#9
Woong-Gil Hong, Gyeong-Won Jeong, Jae-Woon Nah
Branched polyethylenimine (bPEI) was well known as high transfection agent, which has many amine group. However, utilization of bPEI was limited due to high toxicity. To solve these problems, bPEI was introduced to low molecular weight water-soluble chitosan (LMWSC) with coupling agent. In addition, hyaluronic acid (HA), one of natural anion polymer, was introduced to binary complex of pDNA/bPEI-grafted LMWSC (LMPEI) to target the specific cancer cell and impart the serum resistant. Ternary complexes of pDNA/LMPEI/HA were prepared by electrostatic charge interaction and their binding affinity and DNase protection assay were conducted by gel retardation assay...
April 19, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29680046/electrochemical-nonenzymatic-sensor-based-on-cetyltrimethylammonium-bromide-and-chitosan-functionalized-carbon-nanotube-modified-glassy-carbon-electrode-for-the-determination-of-hydroxymethanesulfinate-in-the-presence-of-sulfite-in-foods
#10
Zixue Wu, Feng Guo, Lu Huang, Li Wang
An Electrochemical nonenzymatic sensor was fabricated based on cetyltrimethylammonium bromide (CTAB), chitosan (Chit) and carbon nanotube (CNT) nanocomposite modified glassy carbon electrode. Scanning electron microscopy morphology showed that CNT well dispersed in Chit, while CTAB micelles assembled on the surface of the CNT. Due to the synergetic effect of the three components, excellent electrocatalytic activity towards the oxidation of hydroxymethanesulfinate (HMS) in the presence of both fixed and varying concentrations of sulfite was achieved...
September 1, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29679327/engineering-human-neural-tissue-by-3d-bioprinting
#11
Qi Gu, Eva Tomaskovic-Crook, Gordon G Wallace, Jeremy M Crook
Bioprinting provides an opportunity to produce three-dimensional (3D) tissues for biomedical research and translational drug discovery, toxicology, and tissue replacement. Here we describe a method for fabricating human neural tissue by 3D printing human neural stem cells with a bioink, and subsequent gelation of the bioink for cell encapsulation, support, and differentiation to functional neurons and supporting neuroglia. The bioink uniquely comprises the polysaccharides alginate, water-soluble carboxymethyl-chitosan, and agarose...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29679271/concurrent-reduction-adsorption-of-chromium-using-m-phenylenediamine-modified-magnetic-chitosan-kinetics-isotherm-and-mechanism
#12
Zhonghao Wan, Meng Li, Qian Zhang, Zixi Fan, Francis Verpoort
Magnetic chitosan particles (MCS) were chemically grafted by m-phenylenediamine (mPD) forming a distinctive shell layer with abundant nitrogenous functional groups and used as an adsorbent for the effective removal of Cr(VI) from aqueous solution. By interaction among functional groups in the facile oxidative polymerization process, the grafting of mPD and its polymers on MCS surface was innovatively realized. Through Fourier-transformed infrared spectroscopy, energy dispersive spectrometer, X-ray photoelectron spectroscopy, etc...
April 20, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29678676/an-asymmetric-chitosan-scaffold-for-tendon-tissue-engineering-in-vitro-and-in-vivo-evaluation-with-rat-tendon-stem-progenitor-cells
#13
Erman Chen, Ling Yang, Chenyi Ye, Wei Zhang, Jisheng Ran, Deting Xue, Zhengke Wang, Zhijun Pan, Qiaoling Hu
The poor healing capacity and typically incomplete regeneration of injured tendons has made tendon repair as a primary clinical concern. Several methods for repairing injured tendons have been developed in the last decade. Tendon regeneration using current tissue engineering techniques requires advanced biomaterials to satisfy both microstructural and mechanical criteria. In this study, a novel chitosan (CS)-based scaffold with asymmetric structure was fabricated using a self-deposition technique. The fabricated scaffolds were assessed with regard to the microstructural and mechanical demands of cell ingrowth and the prevention of peritendinous adhesion...
April 17, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29678629/biological-activities-of-laminin-111-derived-peptide-chitosan-matrices-in-a-primary-culture-of-rat-cortical-neurons
#14
Hideki Hayashi, Mariko Yamada, Jun Kumai, Norio Takagi, Motoyoshi Nomizu
Cell adhesive biomaterials have been used for various cells in culture, especially for primary cultures of neurons. Here we examined laminin-111 and its active peptides conjugated to chitosan matrices (ChtMs) for primary culture of rat cortical neurons. Laminin-111 on poly-d-lysine substrate promoted neuronal cell attachment and differentiation. The biological activity of six active laminin-111-derived peptides was examined using a peptide-ChtM construct. When the syndecan-binding peptides, AG73 (RKRLQVQLSIRT, mouse laminin α1 chain 2719-2730) and C16 (KAFDITYVRLKF, laminin γ1 chain 139-150), were conjugated to chitosan, AG73-ChtM and C16-ChtM showed potent neuronal cell attachment activity and promoted axon extension by primary cultured rat cortical neurons...
April 17, 2018: Archives of Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29677682/potential-benefits-and-phytotoxicity-of-bulk-and-nano-chitosan-on-the-growth-morphogenesis-physiology-and-micropropagation-of-capsicum-annuum
#15
Ghasem Asgari-Targhi, Alireza Iranbakhsh, Zahra Oraghi Ardebili
Concerning environmental issues of metal based-nanomaterials and increasing demand for nano-based products; various strategies have been employed to find eco-friendly natural nano-compounds, among which nano-polymer chitosan is mostly considered. Herein, the various aspects of the way in which bulk or nano-chitosan may modify growth, morphogenesis, micropropagation, and physiology of Capsicum annuum L. were considered. Culture medium was manipulated with different concentrations of bulk chitosan or synthesized chitosan/tripolyphosphate (TPP) nano-particle...
April 12, 2018: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/29676206/fabrication-of-vascularized-bone-flaps-with-sustained-release-of-rhbmp-2-and-arteriovenous-bundle
#16
Bo Li, Changshun Ruan, Yufei Ma, Zhifeng Huang, Zhenfei Huang, Gang Zhou, Jing Zhang, Hai Wang, Zhihong Wu, Guixing Qiu
INTRODUCTION: It is a common treatment strategy in the clinic to transplant a vascularized bone flap for a large bone defect. But it is difficult for peripheral blood vessels to grow into the central region of a large bone construct. In this study, we fabricated a vascularized bone flap from a 3D-printed biodegradable PLGA/β-TCP scaffold using the combination of an arteriovenous (AV) bundle and recombinant human bone morphogenetic protein-2 (rhBMP-2). MATERIALS AND METHODS: A degradable porous poly (lactide-co-glycolide) /-tri-calcium phosphate (PLGA/β-TCP) scaffold was prepared by adopting 3D plotting and a low-temperature deposition technique...
April 20, 2018: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/29674721/chitosan-titanium-oxide-fibers-supported-zero-valent-nanoparticles-highly-efficient-and-easily-retrievable-catalyst-for-the-removal-of-organic-pollutants
#17
Fayaz Ali, Sher Bahadar Khan, Tahseen Kamal, Khalid A Alamry, Abdullah M Asiri
Different chitosan-titanium oxide (CS-TiO2 -x, with x = TiO2 loadings of 1, 5, 10,15 and 20 wt%) nanocomposite fibers were prepared and kept separately in each salt solution of CuSO4 , CoNO3 , AgNO3 and NiSO4 to adsorb Cu2+ , Co2+ , Ag+ , and Ni+ ions, respectively. The metal ions loaded onto CS-TiO2 fibers were reduced to their respective zero-valent metal nanoparticles (ZV-MNPs) like Cu0 , Co0 , Ag0 and Ni0 by treating with NaBH4 . The CS-TiO2 fibers templated with various ZV-MNPs were characterized and investigated for their catalytic efficiency...
April 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29673958/binary-grafted-chitosan-film-synthesis-characterization-antibacterial-activity-and-prospects-for-food-packaging
#18
Deepak Kumar, Pramendra Kumar, Jyoti Pandey
The antimicrobial binary grafted chitosan film [chit-g-Poly (An-co-Am)] was prepared by grafting of acrylonitrile and acrylamide on to chitosan via microwave initiated graft copolymerization. The grafting of acrylonitrile and acrylamide onto chitosan backbone was confirmed by FTIR, XRD, SEM and TGA/DTA/DTG analytical techniques. The binary grafted chitosan film possessed efficient antimicrobial activity against three tested strains, i.e. Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa. The prepared binary grafted chitosan film was tested for packaging apple and guava to prevent microbial infection and extend their shelf life...
April 16, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29673055/application-of-mesenchymal-stem-cells-to-enhance-non-union-bone-fracture-healing
#19
Mohammad Mousaei Ghasroldasht, Maryam M Matin, Hossein Kazemi Mehrjerdi, Hojjat Naderi-Meshkin, Ali Moradi, Masoud Rajabioun, Faeze Alipour, Samaneh Ghasemi, Mohammad Zare, Mahdi Mirahmadi, Hamid Reza Bidkhori, Ahmad Reza Bahrami
ECM components include a number of osteoinductive and osteoconductive factors, which are involved in bone fracture healing. In this study, a combination of adipose derived mesenchymal stem cells (Ad-MSCs), cancellous bone graft (CBG), and chitosan hydrogel (CHI) was applied to the in non-union bone fracture and healing effects were evaluated for the first time. After creation of animal models with non-union fracture in rats, they were randomly classified into seven groups. Radiography at 0, 2, 4 and 8 weeks after surgery, indicated the positive effects of Ad-MSCs+CBG+CHI and Ad-MSCs+CBG in treatment of bone fractures as early as 2 weeks after the surgery...
April 19, 2018: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/29672023/chitosan-based-peptidopolysaccharides-as-cationic-antimicrobial-agents-and-antibacterial-coatings
#20
Dicky Pranantyo, Li Qun Xu, En-Tang Kang, Mary B Chan-Park
The rapid spread of multidrug resistant bacteria has called for effective antimicrobial agents which work on a more direct mechanism of killing. Cationic peptidopolysaccharides are developed in the present work to mimic the peptidoglycan structure of bacteria and to enhance the membrane-compromising bactericidal efficacy. Antimicrobial CysHHC10 peptide was grafted to the C-2 (amino) or C-6 (hydroxyl) position of chitosan backbone via thiol-maleimide 'click' conjugation, utilizing the maleimidohexanoic linkers...
April 19, 2018: Biomacromolecules
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