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Romany A, Payne GF, Shen J. Effect of Acetylation on the Nanofibril Formation of Chitosan from All-Atom De Novo Self-Assembly Simulations. Molecules 2024; 29:561. [PMID: 38338306 PMCID: PMC10856132 DOI: 10.3390/molecules29030561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Revised: 01/08/2024] [Accepted: 01/15/2024] [Indexed: 02/12/2024] Open
Abstract
Chitosan-based materials have broad applications, from biotechnology to pharmaceutics. Recent experiments showed that the degree and pattern of acetylation along the chitosan chain modulate its biological and physicochemical properties; however, the molecular mechanism remains unknown. Here, we report, to the best of our knowledge, the first de novo all-atom molecular dynamics (MD) simulations to investigate chitosan's self-assembly process at different degrees and patterns of acetylation. Simulations revealed that 10 mer chitosan chains with 50% acetylation in either block or alternating patterns associate to form ordered nanofibrils comprised of mainly antiparallel chains in agreement with the fiber diffraction data of deacetylated chitosan. Surprisingly, regardless of the acetylation pattern, the same intermolecular hydrogen bonds mediate fibril sheet formation while water-mediated interactions stabilize sheet-sheet stacking. Moreover, acetylated units are involved in forming strong intermolecular hydrogen bonds (NH-O6 and O6H-O7), which offers an explanation for the experimental observation that increased acetylation lowers chitosan's solubility. Taken together, the present study provides atomic-level understanding the role of acetylation plays in modulating chitosan's physiochemical properties, contributing to the rational design of chitosan-based materials with the ability to tune by its degree and pattern of acetylation. Additionally, we disseminate the improved molecular mechanics parameters that can be applied in MD studies to further understand chitosan-based materials.
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Affiliation(s)
- Aarion Romany
- Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, Baltimore, MD 21201, USA;
| | - Gregory F. Payne
- Institute for Bioscience and Biotechnology Research, University of Maryland, College Park, MD 20742, USA;
| | - Jana Shen
- Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, Baltimore, MD 21201, USA;
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2
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Gao YY, Chen W, Bai ZW. Requirements in structure for chiral recognition of chitosan derivatives. J Chromatogr A 2023; 1690:463783. [PMID: 36657297 DOI: 10.1016/j.chroma.2023.463783] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Revised: 01/06/2023] [Accepted: 01/06/2023] [Indexed: 01/11/2023]
Abstract
In order to investigate the influence of a minor variation in structure of N-acyl chitosan derivatives on enantioseparation, chiral selectors (CSs) of chitosan 3,6-bis(phenylcarbamate)-2-(phenylacetamide)s and chitosan 3,6-bis(phenylcarbamate)-2-(cyclohexylacetamide)s were synthesized. The corresponding chiral stationary phases (N-PhAc CSPs and N-cHeAc CSPs) were also prepared, respectively, with the two series of CSs. Enantioseparation results revealed that the N-PhAc CSPs were better than the N-cHeAc ones in enantioseparation. Thus, benzyl group (Bn) at C2 should be more preferable to enantioseparation than cyclohexylmethyl (cyclohexyl-CH2-) at the same position. Because N-PhAc CSPs exhibited higher enantioseparation capability than chitosan 3,6-bis(phenylcarbamate)-2-(benzamide) based CSPs (N-Bz CSPs), the Bn should also be more beneficial to enantioseparation than phenyl group (Ph) at C2 in N-Bz CSPs. In addition, it was found that, the cyclohexyl group at C2 in chitosan 3,6-bis(phenylcarbamate)-2-(cyclohexylformamide) CSPs was better than cyclohexyl-CH2- in N-cHeAc CSPs to enantioseparation. In a word, a minor variation at C2 of chitosan derivatives significantly affected enantioseparation. After the prepared CSPs were stood for six months, their enantioseparation capabilities were changed obviously, and the changes were probably related to nature, position and number of a substituent on Ph connected to carbamates at C3 and C6 of the CSs.
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Affiliation(s)
- Ya-Ya Gao
- School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430205, PR China
| | - Wei Chen
- School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430205, PR China
| | - Zheng-Wu Bai
- School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430205, PR China.
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3
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Mechanical Amorphization of Chitosan with Different Molecular Weights. Polymers (Basel) 2022; 14:polym14204438. [PMID: 36298017 PMCID: PMC9606905 DOI: 10.3390/polym14204438] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Revised: 10/06/2022] [Accepted: 10/18/2022] [Indexed: 11/17/2022] Open
Abstract
Mechanical amorphization of three chitosan samples with high, medium, and low molecular weight was studied. It is shown that there are no significant differences between the course of amorphization process in a planetary ball mill of chitosan with different molecular weights, and the maximum degree of amorphization was achieved in 600 s of high intensity mechanical action. Specific energy consumption was 28 kJ/g, being comparable to power consumption for amorphization of cellulose determined previously (29 kJ/g) and 5–7-fold higher than that for amorphization of starch (4–6 kJ/g). Different techniques for determining the crystallinity index (CrI) of chitosan (analysis of the X-ray diffraction (XRD) data, the peak height method, the amorphous standard method, peak deconvolution, and full-profile Rietveld analysis) were compared. The peak height method is characterized by a broader working range but provides deviated CrI values. The peak deconvolution method (with the amorphous Voigt function) makes it possible to calculate the crystallinity index of chitosan with greater accuracy, but the analysis becomes more difficult with samples subjected to mechanical processing. In order to refine the structure and calculation of CrI by the Rietveld method, an attempt to optimize the structure file by the density functional theory (DFT) method was performed. The averaged profile of amorphous chitosan approximated by an eighth-order Fourier model improved the correctness of the description of the amorphous contribution for XRD data processing. The proposed equation may be used as a universal standard model of amorphous chitosan to determine the crystallinity index both for the amorphous standard method and for peak deconvolution of XRD patterns for arbitrary chitosan samples.
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Yui T, Uto T, Ogawa K. Molecular and Crystal Structure of a Chitosan-Zinc Chloride Complex. NANOMATERIALS 2021; 11:nano11061407. [PMID: 34073379 PMCID: PMC8229668 DOI: 10.3390/nano11061407] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Revised: 05/19/2021] [Accepted: 05/24/2021] [Indexed: 01/11/2023]
Abstract
We determined the molecular and packing structure of a chitosan–ZnCl2 complex by X-ray diffraction and linked-atom least-squares. Eight D-glucosamine residues—composed of four chitosan chains with two-fold helical symmetry, and four ZnCl2 molecules—were packed in a rectangular unit cell with dimensions a = 1.1677 nm, b = 1.7991 nm, and c = 1.0307 nm (where c is the fiber axis). We performed exhaustive structure searches by examining all of the possible chain packing modes. We also comprehensively searched the positions and spatial orientations of the ZnCl2 molecules. Chitosan chains of antiparallel polarity formed zigzag-shaped chain sheets, where N2···O6, N2···N2, and O6···O6 intermolecular hydrogen bonds connected the neighboring chains. We further refined the packing positions of the ZnCl2 molecules by theoretical calculations of the crystal models, which suggested a possible coordination scheme of Zn(II) with an O6 atom.
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Affiliation(s)
- Toshifumi Yui
- Faculty of Engineering, University of Miyazaki, Nishi 1-1 Gakuen-kibanadai, Miyazaki 889-2192, Japan
- Correspondence: ; Tel.: +81-985-58-7319
| | - Takuya Uto
- Organization for Promotion of Tenure Track, University of Miyazaki, Nishi 1-1 Gakuen-kibanadai, Miyazaki 889-2192, Japan;
| | - Kozo Ogawa
- Research Institute for Advanced Science and Technology, Osaka Prefecture University, 1-2 Gakuencho, Sakai, Osaka 599-8570, Japan;
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Marquez-Bravo S, Doench I, Molina P, Bentley FE, Tamo AK, Passieux R, Lossada F, David L, Osorio-Madrazo A. Functional Bionanocomposite Fibers of Chitosan Filled with Cellulose Nanofibers Obtained by Gel Spinning. Polymers (Basel) 2021; 13:polym13101563. [PMID: 34068136 PMCID: PMC8152965 DOI: 10.3390/polym13101563] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2021] [Revised: 05/07/2021] [Accepted: 05/11/2021] [Indexed: 12/20/2022] Open
Abstract
Extremely high mechanical performance spun bionanocomposite fibers of chitosan (CHI), and cellulose nanofibers (CNFs) were successfully achieved by gel spinning of CHI aqueous viscous formulations filled with CNFs. The microstructural characterization of the fibers by X-ray diffraction revealed the crystallization of the CHI polymer chains into anhydrous chitosan allomorph. The spinning process combining acidic-basic-neutralization-stretching-drying steps allowed obtaining CHI/CNF composite fibers of high crystallinity, with enhanced effect at incorporating the CNFs. Chitosan crystallization seems to be promoted by the presence of cellulose nanofibers, serving as nucleation sites for the growing of CHI crystals. Moreover, the preferential orientation of both CNFs and CHI crystals along the spun fiber direction was revealed in the two-dimensional X-ray diffraction patterns. By increasing the CNF amount up to the optimum concentration of 0.4 wt % in the viscous CHI/CNF collodion, Young's modulus of the spun fibers significantly increased up to 8 GPa. Similarly, the stress at break and the yield stress drastically increased from 115 to 163 MPa, and from 67 to 119 MPa, respectively, by adding only 0.4 wt % of CNFs into a collodion solution containing 4 wt % of chitosan. The toughness of the CHI-based fibers thereby increased from 5 to 9 MJ.m-3. For higher CNFs contents like 0.5 wt %, the high mechanical performance of the CHI/CNF composite fibers was still observed, but with a slight worsening of the mechanical parameters, which may be related to a minor disruption of the CHI matrix hydrogel network constituting the collodion and gel fiber, as precursor state for the dry fiber formation. Finally, the rheological behavior observed for the different CHI/CNF viscous collodions and the obtained structural, thermal and mechanical properties results revealed an optimum matrix/filler compatibility and interface when adding 0.4 wt % of nanofibrillated cellulose (CNF) into 4 wt % CHI formulations, yielding functional bionanocomposite fibers of outstanding mechanical properties.
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Affiliation(s)
- Sofia Marquez-Bravo
- Institute of Microsystems Engineering IMTEK, University of Freiburg, 79110 Freiburg, Germany; (S.M.-B.); (I.D.); (P.M.); (F.E.B.); (A.K.T.)
- Freiburg Materials Research Center FMF, University of Freiburg, 79104 Freiburg, Germany
- Freiburg Center for Interactive Materials and Bioinspired Technologies FIT, University of Freiburg, 79110 Freiburg, Germany
| | - Ingo Doench
- Institute of Microsystems Engineering IMTEK, University of Freiburg, 79110 Freiburg, Germany; (S.M.-B.); (I.D.); (P.M.); (F.E.B.); (A.K.T.)
- Freiburg Materials Research Center FMF, University of Freiburg, 79104 Freiburg, Germany
- Freiburg Center for Interactive Materials and Bioinspired Technologies FIT, University of Freiburg, 79110 Freiburg, Germany
| | - Pamela Molina
- Institute of Microsystems Engineering IMTEK, University of Freiburg, 79110 Freiburg, Germany; (S.M.-B.); (I.D.); (P.M.); (F.E.B.); (A.K.T.)
- Freiburg Materials Research Center FMF, University of Freiburg, 79104 Freiburg, Germany
- Freiburg Center for Interactive Materials and Bioinspired Technologies FIT, University of Freiburg, 79110 Freiburg, Germany
| | - Flor Estefany Bentley
- Institute of Microsystems Engineering IMTEK, University of Freiburg, 79110 Freiburg, Germany; (S.M.-B.); (I.D.); (P.M.); (F.E.B.); (A.K.T.)
- Freiburg Materials Research Center FMF, University of Freiburg, 79104 Freiburg, Germany
- Freiburg Center for Interactive Materials and Bioinspired Technologies FIT, University of Freiburg, 79110 Freiburg, Germany
| | - Arnaud Kamdem Tamo
- Institute of Microsystems Engineering IMTEK, University of Freiburg, 79110 Freiburg, Germany; (S.M.-B.); (I.D.); (P.M.); (F.E.B.); (A.K.T.)
- Freiburg Materials Research Center FMF, University of Freiburg, 79104 Freiburg, Germany
- Freiburg Center for Interactive Materials and Bioinspired Technologies FIT, University of Freiburg, 79110 Freiburg, Germany
| | - Renaud Passieux
- Laboratoire Ingénierie des Matériaux Polymères IMP, CNRS UMR 5223, University of Lyon, University Claude Bernard Lyon 1, CEDEX, 69622 Villeurbanne, France; (R.P.); (L.D.)
| | | | - Laurent David
- Laboratoire Ingénierie des Matériaux Polymères IMP, CNRS UMR 5223, University of Lyon, University Claude Bernard Lyon 1, CEDEX, 69622 Villeurbanne, France; (R.P.); (L.D.)
| | - Anayancy Osorio-Madrazo
- Institute of Microsystems Engineering IMTEK, University of Freiburg, 79110 Freiburg, Germany; (S.M.-B.); (I.D.); (P.M.); (F.E.B.); (A.K.T.)
- Freiburg Materials Research Center FMF, University of Freiburg, 79104 Freiburg, Germany
- Freiburg Center for Interactive Materials and Bioinspired Technologies FIT, University of Freiburg, 79110 Freiburg, Germany
- Correspondence: ; Tel.: +49-761-203-67363
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6
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Chen W, Zhang G, Wang J, Qiu G, Bai Z. Influence of phenyl group number on enantioseparation performance of chitosan‐based materials. J Appl Polym Sci 2020. [DOI: 10.1002/app.50144] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Wei Chen
- School of Chemistry and Environmental Engineering Wuhan Institute of Technology Wuhan P. R. China
| | - Gui‐Hua Zhang
- School of Chemistry and Environmental Engineering Wuhan Institute of Technology Wuhan P. R. China
| | - Jing Wang
- School of Chemistry and Environmental Engineering Wuhan Institute of Technology Wuhan P. R. China
| | - Guo‐Song Qiu
- School of Chemistry and Environmental Engineering Wuhan Institute of Technology Wuhan P. R. China
| | - Zheng‐Wu Bai
- School of Chemistry and Environmental Engineering Wuhan Institute of Technology Wuhan P. R. China
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7
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Ogawa Y, Naito PK, Nishiyama Y. Hydrogen-bonding network in anhydrous chitosan from neutron crystallography and periodic density functional theory calculations. Carbohydr Polym 2019; 207:211-217. [DOI: 10.1016/j.carbpol.2018.11.042] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Revised: 11/13/2018] [Accepted: 11/14/2018] [Indexed: 11/29/2022]
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8
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Shipovskaya AB, Shmakov SL, Gegel NO. Optical activity anisotropy of chitosan-based films. Carbohydr Polym 2019; 206:476-486. [PMID: 30553347 DOI: 10.1016/j.carbpol.2018.11.026] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2018] [Revised: 10/23/2018] [Accepted: 11/08/2018] [Indexed: 01/28/2023]
Abstract
The optical activity [α] of films of chitosan and chitosan acetate was studied. [α] depended on the orientation angle θ of the film sample around the light beam. The angular dependences [α] = f(θ) (indicatrices) were processed to extract the constant term [α]0and four harmonics ([α]i, Fourier's series) determined by structure elements with the corresponding symmetry: the amorphous (isotropic) phase of chitosan ([α]0), irregular-shaped structures ([α]1), rod-shaped ones in the film plane ([α]2), helical ones located perpendicular to the film surface ([α]3), and crystalline structures ([α]4). The contribution of individual supramolecular structures to the overall optical activity of chitosan was estimated: [α]2 and [α]4 predominated for the fresh chitosan acetate films, while [α]4 did for the chitosan ones. The results of the numerical decomposition of indicatrices are in satisfactory agreement with X-ray diffractometry data. The observed regularities predetermine prospects for obtaining stereoselective chiro-optic chitosan-based materials with novel functional properties.
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Affiliation(s)
- Anna B Shipovskaya
- Institute of Chemistry, Chernyshevsky Saratov State University, Saratov, Russian Federation.
| | - Sergei L Shmakov
- Institute of Chemistry, Chernyshevsky Saratov State University, Saratov, Russian Federation
| | - Natalia O Gegel
- Institute of Chemistry, Chernyshevsky Saratov State University, Saratov, Russian Federation; Institute of Biochemistry and Physiology of Plants and Microorganisms, Russian Academy of Sciences, Saratov, Russian Federation.
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9
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Desorme M, Montembault A, Tamet T, Maleysson P, Bouet T, David L. Spinning of hydroalcoholic chitosan solutions: Mechanical behavior and multiscale microstructure of resulting fibers. J Appl Polym Sci 2018. [DOI: 10.1002/app.47130] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- M. Desorme
- Université de Lyon, Université Claude Bernard Lyon 1CNRS UMR 5223 Ingénierie des Matériaux Polymères IMP@Lyon1 15 bd Latarjet, 69622, Villeurbanne Cedex France
- Laboratoire TETRA MedicalP.A.E. de Marenton, Avenue Rhin et Danube BP 142 07104 Annonay Cedex France
| | - A. Montembault
- Université de Lyon, Université Claude Bernard Lyon 1CNRS UMR 5223 Ingénierie des Matériaux Polymères IMP@Lyon1 15 bd Latarjet, 69622, Villeurbanne Cedex France
| | - T. Tamet
- Université de Lyon, Université Claude Bernard Lyon 1CNRS UMR 5223 Ingénierie des Matériaux Polymères IMP@Lyon1 15 bd Latarjet, 69622, Villeurbanne Cedex France
| | - P. Maleysson
- Institut Français du Textile et de l'Habillement – IFTHDirection Régionale Rhône‐Alpes PACA 93 chemin des Mouilles 69130 Ecully Cedex France
| | - T. Bouet
- Laboratoire TETRA MedicalP.A.E. de Marenton, Avenue Rhin et Danube BP 142 07104 Annonay Cedex France
| | - L. David
- Université de Lyon, Université Claude Bernard Lyon 1CNRS UMR 5223 Ingénierie des Matériaux Polymères IMP@Lyon1 15 bd Latarjet, 69622, Villeurbanne Cedex France
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10
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Elaboration of hydroxyapatite nanoparticles and chitosan/hydroxyapatite composites: a present status. Polym Bull (Berl) 2018. [DOI: 10.1007/s00289-018-2483-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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11
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Hasan A, Waibhaw G, Saxena V, Pandey LM. Nano-biocomposite scaffolds of chitosan, carboxymethyl cellulose and silver nanoparticle modified cellulose nanowhiskers for bone tissue engineering applications. Int J Biol Macromol 2018; 111:923-934. [DOI: 10.1016/j.ijbiomac.2018.01.089] [Citation(s) in RCA: 144] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Revised: 01/05/2018] [Accepted: 01/13/2018] [Indexed: 12/17/2022]
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12
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Naqvi S, Mohiyuddin S, Gopinath P. Niclosamide loaded biodegradable chitosan nanocargoes: an in vitro study for potential application in cancer therapy. ROYAL SOCIETY OPEN SCIENCE 2017; 4:170611. [PMID: 29291056 PMCID: PMC5717630 DOI: 10.1098/rsos.170611] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2017] [Accepted: 09/12/2017] [Indexed: 05/08/2023]
Abstract
Chitosan nanoparticles can advance the pharmacological and therapeutic properties of chemotherapeutic agents by controlling release rates and targeted delivery process, which eliminates the limitations of conventional anti-cancer therapies and they are also safe as well as cost-effective. The aim of present study is to explore the anti-tumour effect of niclosamide in lung and breast cancer cell lines using biocompatible and biodegradable carrier where nanoparticles loaded with hydrophobic drug (niclosamide) were synthesized, characterized and applied as a stable anti-cancer agent. Niclosamide loaded chitosan nanoparticles (Nic-Chi Np's) of size approximately 100-120 nm in diameter containing hydrophobic anti-cancer drug, i.e. niclosamide, were prepared. Physico-chemical characterization confirms that the prepared nanoparticles are spherical, monodispersed and stable in aqueous systems. The therapeutic efficacy of Nic-Chi Np's was evaluated against breast cancer cell line (MCF-7) and human lung cancer cell line (A549). MTT assay reveals the cell viability of the prepared Nic-Chi Np's against A549 and MCF-7 cells and obtained an IC50 value of 8.75 µM and 7.5 µM, respectively. Acridine orange/ethidium bromide dual staining results verified the loss of the majority of the cells by apoptosis. Flow cytometer analysis quantified the generation of intracellular reactive oxygen species (ROS) and signified that exposure to a higher concentration (2 × IC50) of Nic-Chi Np's resulted in elevated ROS generation. Notably, Nic-Chi Np treatment showed more apoptosis and cell death in MCF-7 as compared to A549. Further, the remarkable induction of apoptosis by Nic-Chi Np's was confirmed by semi-quantitative reverse transcription polymerase chain reaction, scanning electron microscopy and cell-cycle analysis. Thus, Nic-Chi Np's may have a great potential even at low concentration for anti-cancer therapy and may replace or substitute more toxic anti-mitotic drugs in the near future.
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Affiliation(s)
- Saba Naqvi
- Nanobiotechnology Laboratory, Centre of Nanotechnology, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
| | - Shanid Mohiyuddin
- Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
| | - P. Gopinath
- Nanobiotechnology Laboratory, Centre of Nanotechnology, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
- Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
- Author for correspondence: P. Gopinath e-mail: ;
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Becerra J, Sudre G, Royaud I, Montserret R, Verrier B, Rochas C, Delair T, David L. Tuning the Hydrophilic/Hydrophobic Balance to Control the Structure of Chitosan Films and Their Protein Release Behavior. AAPS PharmSciTech 2017; 18:1070-1083. [PMID: 27975192 DOI: 10.1208/s12249-016-0678-9] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2016] [Accepted: 11/22/2016] [Indexed: 11/30/2022] Open
Abstract
The control over the crystallinity of chitosan and chitosan/ovalbumin films can be achieved via an appropriate balance of the hydrophilic/hydrophobic interactions during the film formation process, which then controls the release kinetics of ovalbumin. Chitosan films were prepared by solvent casting. The presence of the anhydrous allomorph can be viewed as a probe of the hydrophobic conditions at the neutralization step. The semicrystalline structure, the swelling behavior of the films, the protein/chitosan interactions, and the release behavior of the films were impacted by the DA and the film processing parameters. At low DAs, the chitosan films neutralized in the solid state corresponded to the most hydrophobic environment, inducing the crystallization of the anhydrous allomorph with and without protein. The most hydrophilic conditions, leading to the hydrated allomorph, corresponded to non-neutralized films for the highest DAs. For the non-neutralized chitosan acetate (amorphous) films, the swelling increased when the DA decreased, whereas for the neutralized chitosan films, the swelling decreased. The in vitro release of ovalbumin (model protein) from chitosan films was controlled by their swelling behavior. For fast swelling films (DA = 45%), a burst effect was observed. On the contrary, a lag time was evidenced for DA = 2.5% with a limited release of the protein. Furthermore, by blending chitosans (DA = 2.5% and 45%), the release behavior was improved by reducing the burst effect and the lag time. The secondary structure of ovalbumin was partially maintained in the solid state, and the ovalbumin was released under its native form.
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14
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Naito PK, Ogawa Y, Sawada D, Nishiyama Y, Iwata T, Wada M. X-ray crystal structure of anhydrous chitosan at atomic resolution. Biopolymers 2017; 105:361-8. [PMID: 26930586 DOI: 10.1002/bip.22818] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2015] [Revised: 01/26/2016] [Accepted: 01/31/2016] [Indexed: 01/18/2023]
Abstract
We determined the crystal structure of anhydrous chitosan at atomic resolution, using X-ray fiber diffraction data extending to 1.17 Å resolution. The unit cell [a = 8.129(7) Å, b = 8.347(6) Å, c = 10.311(7) Å, space group P21 21 21 ] of anhydrous chitosan contains two chains having one glucosamine residue in the asymmetric unit with the primary hydroxyl group in the gt conformation, that could be directly located in the Fourier omit map. The molecular arrangement of chitosan is very similar to the corner chains of cellulose II implying similar intermolecular hydrogen bonding between O6 and the amine nitrogen atom, and an intramolecular bifurcated hydrogen bond from O3 to O5 and O6. In addition to the classical hydrogen bonds, all the aliphatic hydrogens were involved in one or two weak hydrogen bonds, mostly helping to stabilize cohesion between antiparallel chains. © 2016 Wiley Periodicals, Inc. Biopolymers 105: 361-368, 2016.
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Affiliation(s)
- Philip-Kunio Naito
- Department of Biomaterials Science, Graduate School of Agricultural and Life Science, the University of Tokyo, Tokyo, 113-8657, Japan
| | - Yu Ogawa
- CNRS, CERMAV, Grenoble, F-38000, France.,CERMAV, University Grenoble Alpes, Grenoble, F-38000, France
| | - Daisuke Sawada
- Biology and Soft Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831
| | - Yoshiharu Nishiyama
- CNRS, CERMAV, Grenoble, F-38000, France.,CERMAV, University Grenoble Alpes, Grenoble, F-38000, France
| | - Tadahisa Iwata
- Department of Biomaterials Science, Graduate School of Agricultural and Life Science, the University of Tokyo, Tokyo, 113-8657, Japan
| | - Masahisa Wada
- Division of Forest and Biomaterials Science, Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan.,Department of Plant & Environmental New Resources, College of Life Sciences, Kyung Hee University, Yongin-si, Gyeonggi-do, 446-701, Korea
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15
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Kiroshka VV, Petrova VA, Chernyakov DD, Bozhkova YO, Kiroshka KV, Baklagina YG, Romanov DP, Kremnev RV, Skorik YA. Influence of chitosan-chitin nanofiber composites on cytoskeleton structure and the proliferation of rat bone marrow stromal cells. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2017; 28:21. [PMID: 28012155 DOI: 10.1007/s10856-016-5822-2] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2016] [Accepted: 11/28/2016] [Indexed: 06/06/2023]
Abstract
Chitosan scaffolds have gained much attention in various tissue engineering applications, but the effect of their microstructure on cell-material spatial interactions remains unclear. Our objective was to evaluate the effect of chitosan-based matrices doping with chitin nano-whiskers (CNW) on adhesion, spreading, cytoskeleton structure, and proliferation of rat bone marrow stromal cells (BMSCs). The behavior of BMSCs during culture on chitosan-CNW films was determined by the molecular mass, hydrophobicity, porosity, crosslinking degree, protonation degree and molecular structure of the composite chitosan-CNW films. The shape, spreading area, cytoskeleton structure, and proliferation of BMSCs on chitosan matrices with a crystalline structure and high porosity were similar to that observed for BMSCs cultured on polystyrene tissue culture plates. The amorphous polymer structure and high swelling led to a decrease in the spreading area and cell proliferation. Thus, we can control the behavior of cells in culture (adhesion, spreading, and proliferation) by changing the physico-chemical properties of the chitosan-CNW films.
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Affiliation(s)
- Victoria V Kiroshka
- Institute for Problems of Cryobiology and Cryomedicine of the National Academy of Sciences of Ukraine, Pereyaslavskaya ul. 23, Kharkov, 61015, Ukraine
| | - Valentina A Petrova
- Institute of Macromolecular Compounds of the Russian Academy of Sciences, Bolshoi pr. VO 31, St. Petersburg, 199004, Russian Federation
| | - Daniil D Chernyakov
- Institute of Macromolecular Compounds of the Russian Academy of Sciences, Bolshoi pr. VO 31, St. Petersburg, 199004, Russian Federation
| | - Yulia O Bozhkova
- Institute for Problems of Cryobiology and Cryomedicine of the National Academy of Sciences of Ukraine, Pereyaslavskaya ul. 23, Kharkov, 61015, Ukraine
| | - Katerina V Kiroshka
- Institute for Problems of Cryobiology and Cryomedicine of the National Academy of Sciences of Ukraine, Pereyaslavskaya ul. 23, Kharkov, 61015, Ukraine
| | - Yulia G Baklagina
- Institute of Macromolecular Compounds of the Russian Academy of Sciences, Bolshoi pr. VO 31, St. Petersburg, 199004, Russian Federation
| | - Dmitry P Romanov
- Institute of Silicate Chemistry of the Russian Academy of Sciences, Adm. Makarova nab. 2, St. Petersburg, 199034, Russian Federation
| | - Roman V Kremnev
- Institute of Chemistry, St. Petersburg State University, Universitetskii pr. 26, Petrodvorets, St. Petersburg, 198504, Russian Federation
| | - Yury A Skorik
- Institute of Macromolecular Compounds of the Russian Academy of Sciences, Bolshoi pr. VO 31, St. Petersburg, 199004, Russian Federation.
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16
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Bhowmick A, Pramanik N, Mitra T, Gnanamani A, Das M, Kundu PP. Fabrication of porous magnetic nanocomposites for bone tissue engineering. NEW J CHEM 2017. [DOI: 10.1039/c6nj03358j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Porous superparamagnetic chitosan/polyethylene glycol/hydroxyapatite–Fe3O4 nanocomposites were developed for bone tissue engineering.
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Affiliation(s)
- Arundhati Bhowmick
- Department of Polymer Science and Technology
- University of Calcutta
- Kolkata-700009
- India
| | - Nilkamal Pramanik
- Department of Polymer Science and Technology
- University of Calcutta
- Kolkata-700009
- India
| | - Tapas Mitra
- Department of Polymer Science and Technology
- University of Calcutta
- Kolkata-700009
- India
| | - Arumugam Gnanamani
- Microbiology Division
- CSIR-Central Leather Research Institute
- Chennai-600020
- India
| | - Manas Das
- Department of Chemical Engineering
- University of Calcutta
- Kolkata-700009
- India
| | - Patit Paban Kundu
- Department of Polymer Science and Technology
- University of Calcutta
- Kolkata-700009
- India
- Department of Chemical Engineering
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17
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Petrova VA, Orekhov AS, Chernyakov DD, Baklagina YG, Romanov DP, Kononova SV, Volod’ko AV, Ermak IM, Klechkovskaya VV, Skorik YA. Preparation and analysis of multilayer composites based on polyelectrolyte complexes. CRYSTALLOGR REP+ 2016. [DOI: 10.1134/s1063774516060110] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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18
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Fabrication of Gelatin-Based Electrospun Composite Fibers for Anti-Bacterial Properties and Protein Adsorption. Mar Drugs 2016; 14:md14100192. [PMID: 27775645 PMCID: PMC5082340 DOI: 10.3390/md14100192] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2016] [Revised: 10/14/2016] [Accepted: 10/17/2016] [Indexed: 01/10/2023] Open
Abstract
A major goal of biomimetics is the development of chemical compositions and structures that simulate the extracellular matrix. In this study, gelatin-based electrospun composite fibrous membranes were prepared by electrospinning to generate bone scaffold materials. The gelatin-based multicomponent composite fibers were fabricated using co-electrospinning, and the composite fibers of chitosan (CS), gelatin (Gel), hydroxyapatite (HA), and graphene oxide (GO) were successfully fabricated for multi-function characteristics of biomimetic scaffolds. The effect of component concentration on composite fiber morphology, antibacterial properties, and protein adsorption were investigated. Composite fibers exhibited effective antibacterial activity against Staphylococcus aureus and Escherichia coli. The study observed that the composite fibers have higher adsorption capacities of bovine serum albumin (BSA) at pH 5.32-6.00 than at pH 3.90-4.50 or 7.35. The protein adsorption on the surface of the composite fiber increased as the initial BSA concentration increased. The surface of the composite reached adsorption equilibrium at 20 min. These results have specific applications for the development of bone scaffold materials, and broad implications in the field of tissue engineering.
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19
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Fareez IM, Lim SM, Lim FT, Mishra RK, Ramasamy K. Microencapsulation of Lactobacillus
SP. Using Chitosan-Alginate-Xanthan Gum-β-Cyclodextrin and Characterization of its Cholesterol Reducing Potential and Resistance Against pH, Temperature and Storage. J FOOD PROCESS ENG 2016. [DOI: 10.1111/jfpe.12458] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ismail M. Fareez
- Faculty of Pharmacy; University Teknologi MARA (UiTM); Bandar Puncak Alam Selangor Darul Ehsan 42300 Malaysia
- Collaborative Drug Discovery Research (CDDR) Group, Pharmaceutical and Life Sciences Community of Research, Universiti Teknologi MARA (UiTM); Shah Alam Selangor Darul Ehsan 40450 Malaysia
| | - Siong Meng Lim
- Faculty of Pharmacy; University Teknologi MARA (UiTM); Bandar Puncak Alam Selangor Darul Ehsan 42300 Malaysia
- Collaborative Drug Discovery Research (CDDR) Group, Pharmaceutical and Life Sciences Community of Research, Universiti Teknologi MARA (UiTM); Shah Alam Selangor Darul Ehsan 40450 Malaysia
| | - Fei Tieng Lim
- Faculty of Pharmacy; University Teknologi MARA (UiTM); Bandar Puncak Alam Selangor Darul Ehsan 42300 Malaysia
- Collaborative Drug Discovery Research (CDDR) Group, Pharmaceutical and Life Sciences Community of Research, Universiti Teknologi MARA (UiTM); Shah Alam Selangor Darul Ehsan 40450 Malaysia
| | - Rakesh K. Mishra
- Faculty of Pharmacy; University Teknologi MARA (UiTM); Bandar Puncak Alam Selangor Darul Ehsan 42300 Malaysia
- Brain Degeneration and Therapeutics Group; Pharmaceutical and Life Sciences Community of Research, Universiti Teknologi MARA (UiTM); Shah Alam Selangor Darul Ehsan 40450 Malaysia
| | - Kalavathy Ramasamy
- Faculty of Pharmacy; University Teknologi MARA (UiTM); Bandar Puncak Alam Selangor Darul Ehsan 42300 Malaysia
- Collaborative Drug Discovery Research (CDDR) Group, Pharmaceutical and Life Sciences Community of Research, Universiti Teknologi MARA (UiTM); Shah Alam Selangor Darul Ehsan 40450 Malaysia
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20
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Singh RK, Awasthi S, Dhayalan A, Ferreira JMF, Kannan S. Deposition, structure, physical and invitro characteristics of Ag-doped β-Ca3(PO4)2/chitosan hybrid composite coatings on Titanium metal. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 62:692-701. [PMID: 26952474 DOI: 10.1016/j.msec.2016.02.013] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2015] [Revised: 01/28/2016] [Accepted: 02/03/2016] [Indexed: 01/06/2023]
Abstract
Pure and five silver-doped (0-5Ag) β-tricalcium phosphate [β-TCP, β-Ca3(PO4)2]/chitosan composite coatings were deposited on Titanium (Ti) substrates and their properties that are relevant for applications in hard tissue replacements were assessed. Silver, β-TCP and chitosan were combined to profit from their salient and complementary antibacterial and biocompatible features.The β-Ca3(PO4)2 powders were synthesized by co-precipitation. The characterization results confirmed the Ag(+) occupancy at the crystal lattice of β-Ca3(PO4)2. The Ag-dopedβ-Ca3(PO4)2/chitosan composite coatings deposited by electrophoresis showed good antibacterial activity and exhibited negative cytotoxic effects towards the human osteosarcoma cell line MG-63. The morphology of the coatings was observed by SEM and their efficiency against corrosion of metallic substrates was determined through potentiodynamic polarization tests.
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Affiliation(s)
- Ram Kishore Singh
- Centre for Nanoscience and Technology, Pondicherry University, Puducherry605 014, India
| | - Sharad Awasthi
- Department of Biotechnology, Pondicherry University, Puducherry605 014, India
| | - Arunkumar Dhayalan
- Department of Biotechnology, Pondicherry University, Puducherry605 014, India
| | - J M F Ferreira
- Department of Materials and Ceramics Engineering, University of Aveiro, CICECO, Aveiro3810 193, Portugal
| | - S Kannan
- Centre for Nanoscience and Technology, Pondicherry University, Puducherry605 014, India.
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21
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Bhowmick A, Mitra T, Gnanamani A, Das M, Kundu PP. Development of biomimetic nanocomposites as bone extracellular matrix for human osteoblastic cells. Carbohydr Polym 2015; 141:82-91. [PMID: 26876999 DOI: 10.1016/j.carbpol.2015.12.074] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2015] [Revised: 12/27/2015] [Accepted: 12/29/2015] [Indexed: 12/23/2022]
Abstract
Here, we have developed biomimetic nanocomposites containing chitosan, poly(vinyl alcohol) and nano-hydroxyapatite-zinc oxide as bone extracellular matrix for human osteoblastic cells and characterized by Fourier transform infrared spectroscopy, powder X-ray diffraction. Scanning electron microscopy images revealed interconnected macroporous structures. Moreover, in this study, the problem related to fabricating a porous composite with good mechanical strength has been resolved by incorporating 5wt% of nano-hydroxyapatite-zinc oxide into chitosan-poly(vinyl alcohol) matrix; the present composite showed high tensile strength (20.25MPa) while maintaining appreciable porosity (65.25%). These values are similar to human cancellous bone. These nanocomposites also showed superior water uptake, antimicrobial and biodegradable properties than the previously reported results. Compatibility with human blood and pH was observed, indicating nontoxicity of these materials to the human body. Moreover, proliferation of osteoblastic MG-63 cells onto the nanocomposites was also observed without having any negative effect.
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Affiliation(s)
- Arundhati Bhowmick
- Department of Polymer Science and Technology, University of Calcutta, 92 A.P.C. Road, Kolkata 700009, India
| | - Tapas Mitra
- Department of Polymer Science and Technology, University of Calcutta, 92 A.P.C. Road, Kolkata 700009, India
| | - Arumugam Gnanamani
- Microbiology Division, CSIR-Central Leather Research Institute, Adyar, Chennai 600020, Tamil Nadu, India
| | - Manas Das
- Department of Chemical Engineering, University of Calcutta, 92 A.P.C. Road, Kolkata 700009, India
| | - Patit Paban Kundu
- Department of Polymer Science and Technology, University of Calcutta, 92 A.P.C. Road, Kolkata 700009, India.
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22
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Takara E, Marchese J, Ochoa N. NaOH treatment of chitosan films: Impact on macromolecular structure and film properties. Carbohydr Polym 2015; 132:25-30. [DOI: 10.1016/j.carbpol.2015.05.077] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2015] [Revised: 05/27/2015] [Accepted: 05/30/2015] [Indexed: 01/29/2023]
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23
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Unusual effects of monocarboxylic acids on the structure and on the transport and mechanical properties of chitosan films. Carbohydr Polym 2015; 132:419-29. [DOI: 10.1016/j.carbpol.2015.06.050] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2015] [Revised: 06/08/2015] [Accepted: 06/18/2015] [Indexed: 11/18/2022]
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24
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Naito PK, Ogawa Y, Kimura S, Iwata T, Wada M. Crystal transition from hydrated chitosan and chitosan/monocarboxylic acid complex to anhydrous chitosan investigated by X-ray diffraction. ACTA ACUST UNITED AC 2015. [DOI: 10.1002/polb.23748] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Philip-Kunio Naito
- Department of Biomaterials Sciences; Graduate School of Agricultural and Life Sciences; the University of Tokyo; Yayoi 1-1-1 Bunkyo-ku Tokyo Japan
| | - Yu Ogawa
- Centre de Recherches sur les Macromolécules Végétales; CNRS, BP 53, 38041 Grenoble cedex 9 France
| | - Satoshi Kimura
- Department of Biomaterials Sciences; Graduate School of Agricultural and Life Sciences; the University of Tokyo; Yayoi 1-1-1 Bunkyo-ku Tokyo Japan
- Department of Plant & Environmental New Resources; College of Life Sciences; Kyung Hee University; 1, Seocheon-dong, Giheung-ku Yongin-si Gyeonggi-do 446-701 Korea
| | - Tadahisa Iwata
- Department of Biomaterials Sciences; Graduate School of Agricultural and Life Sciences; the University of Tokyo; Yayoi 1-1-1 Bunkyo-ku Tokyo Japan
| | - Masahisa Wada
- Department of Plant & Environmental New Resources; College of Life Sciences; Kyung Hee University; 1, Seocheon-dong, Giheung-ku Yongin-si Gyeonggi-do 446-701 Korea
- Division of Forest and Biomaterials Science; Graduate School of Agriculture; Kyoto University; Kitashirakawa Oiwake-cho Sakyo-ku 606-8502 Kyoto Japan
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25
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Fine microstructure of processed chitosan nanofibril networks preserving directional packing and high molecular weight. Carbohydr Polym 2015; 131:1-8. [PMID: 26256153 DOI: 10.1016/j.carbpol.2015.05.011] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2014] [Revised: 04/30/2015] [Accepted: 05/04/2015] [Indexed: 11/21/2022]
Abstract
Crystalline chitosan nanofibril networks were prepared, preserving the native structural packing and the polymer high molecular weight. The fine microstructure of the nanomaterial, obtained by mild hydrolysis of chitosan (CHI), was characterized by using synchrotron small- and wide-angle X-ray scattering (SAXS and WAXS), transmission electron microscopy (TEM) and electron diffraction. Hydrolysis of chitosan yielded a network of crystalline nanofibrils, containing both allomorphs of chitosan: hydrated and anhydrous. The comparison of WAXS data in transmission and reflection mode revealed the preferential orientation of the CHI crystals when subjected to mechanical compression constrains. The results are in agreement with the existence of a network nanostructure containing fiber-like crystals with the principal axis parallel to the polymer chain axis. The evolution of the CHI allomorphic composition with temperature was studied to further elucidate the mechanism of structural transitions occurring during CHI nanofibril network processing.
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26
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Bhowmick A, Saha A, Pramanik N, Banerjee S, Das M, Kundu PP. Novel magnetic antimicrobial nanocomposites for bone tissue engineering applications. RSC Adv 2015. [DOI: 10.1039/c5ra02413g] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Here we have developed novel bone-like superparamagnetic nanocomposites for bone tissue engineering. These nanocomposites exhibited high water uptake ability, excellent mechanical properties, good antimicrobial activities and blood compatibility.
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Affiliation(s)
- Arundhati Bhowmick
- Department of Polymer Science and Technology
- University of Calcutta
- Kolkata-700009
- India
| | - Arijit Saha
- Department of Chemistry
- Guru Ghasidas Vishwavidyalaya
- Bilaspur
- India
| | - Nilkamal Pramanik
- Department of Polymer Science and Technology
- University of Calcutta
- Kolkata-700009
- India
| | - Subhash Banerjee
- Department of Chemistry
- Guru Ghasidas Vishwavidyalaya
- Bilaspur
- India
| | - Manas Das
- Department of Chemical Engineering
- University of Calcutta
- Kolkata-700009
- India
| | - Patit Paban Kundu
- Department of Polymer Science and Technology
- University of Calcutta
- Kolkata-700009
- India
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27
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Bhowmick A, Pramanik N, Manna PJ, Mitra T, Raja Selvaraj TK, Gnanamani A, Das M, Kundu PP. Development of porous and antimicrobial CTS–PEG–HAP–ZnO nano-composites for bone tissue engineering. RSC Adv 2015. [DOI: 10.1039/c5ra16755h] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We have developed porous, antimicrobial, biodegradable, and pH and blood compatible CTS–PEG–HAP–ZnO nanocomposites having good mechanical properties and osteoblast cell proliferation abilities to mimic cancellous bone in bone tissue engineering.
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Affiliation(s)
- Arundhati Bhowmick
- Department of Polymer Science and Technology
- University of Calcutta
- Kolkata-700009
- India
| | - Nilkamal Pramanik
- Department of Polymer Science and Technology
- University of Calcutta
- Kolkata-700009
- India
| | - Piyali Jana Manna
- Department of Polymer Science and Technology
- University of Calcutta
- Kolkata-700009
- India
| | - Tapas Mitra
- Department of Polymer Science and Technology
- University of Calcutta
- Kolkata-700009
- India
| | | | - Arumugam Gnanamani
- Microbiology Division
- CSIR-Central Leather Research Institute
- Chennai-600020
- India
| | - Manas Das
- Department of Chemical Engineering
- University of Calcutta
- Kolkata-700009
- India
| | - Patit Paban Kundu
- Department of Polymer Science and Technology
- University of Calcutta
- Kolkata-700009
- India
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28
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Development of nano-hydroxyapatite/chitosan composite for cadmium ions removal in wastewater treatment. J Taiwan Inst Chem Eng 2014. [DOI: 10.1016/j.jtice.2013.10.008] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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29
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Bhowmick A, Kundu PP, Kumar R, Das M. Multicomponent Fabrication of Bone-Like Composite Materials Using Chitosan/PMMA-co
-PHEMA/Nano-Hydroxyapatite. ADVANCES IN POLYMER TECHNOLOGY 2013. [DOI: 10.1002/adv.21391] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Arundhati Bhowmick
- Department of Polymer Science and Technology; University of Calcutta; 92 A.P.C. Road Kolkata- 700009 India
| | - Patit Paban Kundu
- Department of Polymer Science and Technology; University of Calcutta; 92 A.P.C. Road Kolkata- 700009 India
| | - Ratnesh Kumar
- National Institute for the Orthopaedically Handicapped; Bonhooghly; Kolkata- 90 India
| | - Manas Das
- Department of Chemical Engineering; University of Calcutta; 92 A.P.C. Road Kolkata- 700009 India
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30
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Nandi SK, Kundu B, Basu D. Protein growth factors loaded highly porous chitosan scaffold: a comparison of bone healing properties. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2012; 33:1267-75. [PMID: 23827571 DOI: 10.1016/j.msec.2012.12.025] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2012] [Revised: 11/10/2012] [Accepted: 12/04/2012] [Indexed: 11/24/2022]
Abstract
Present study aimed to investigate and compare effectiveness of porous chitosan alone and in combination with insulin like growth factor-1 (IGF-1) and bone morphogenetic protein-2 (BMP-2) in bone healing. Highly porous (85±2%) with wide distribution of macroporous (70-900 μm) chitosan scaffolds were fabricated as bone substitutes by employing a simple liquid hardening method using 2% (w/v) chitosan suspension. IGF-1 and BMP-2 were infiltrated using vacuum infiltration with freeze drying method. Adsorption efficiency was found to be 87±2 and 90±2% for BMP-2 and IGF-1 respectively. After thorough material characterization (pore details, FTIR and SEM), samples were used for subsequent in vivo animal trial. Eighteen rabbit models were used to evaluate and compare control (chitosan) (group A), chitosan with IGF-1 (group B) and chitosan with BMP-2 (group C) in the repair of critical size bone defect in tibia. Radiologically, there was evidence of radiodensity in defect area from 60th day (initiated on 30th day) in groups B and C as compared to group A and attaining nearly bony density in most of the part at day 90. Histological results depicted well developed osteoblastic proliferation around haversian canal along with proliferating fibroblast, vascularization and reticular network which was more pronounced in group B followed by groups C and A. Fluorochrome labeling and SEM studies in all groups showed similar outcome. Hence, porous chitosan alone and in combination with growth factors (GFs) can be successfully used for bone defect healing with slight advantage of IGF-1 in chitosan samples.
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Affiliation(s)
- Samit K Nandi
- Department of Veterinary Surgery and Radiology, West Bengal University of Animal and Fishery Sciences, Kolkata, India.
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31
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Wongkongkatep P, Manopwisedjaroen K, Tiposoth P, Archakunakorn S, Pongtharangkul T, Suphantharika M, Honda K, Hamachi I, Wongkongkatep J. Bacteria interface pickering emulsions stabilized by self-assembled bacteria-chitosan network. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:5729-36. [PMID: 22443382 DOI: 10.1021/la300660x] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
An oil-in-water Pickering emulsion stabilized by biobased material based on a bacteria-chitosan network (BCN) was developed for the first time in this study. The formation of self-assembled BCN was possible due to the electrostatic interaction between negatively charged bacterial cells and polycationic chitosan. The BCN was proven to stabilize the tetradecane/water interface, promoting formation of highly stable oil-in-water emulsion (o/w emulsion). We characterized and visualized the BCN stabilized o/w emulsions by scanning electron microscopy (SEM) and laser scanning confocal microscopy (LSCM). Due to the sustainability and low environmental impact of chitosan, the BCN-based emulsions open up opportunities for the development of an environmental friendly new interface material as well as the novel type of microreactor utilizing bacterial cells network.
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Affiliation(s)
- Pravit Wongkongkatep
- Department of Biotechnology, Faculty of Science, Mahidol University, Bangkok, Thailand
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32
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Gandhi MR, Kousalya GN, Meenakshi S. Selective sorption of Fe(III) using modified forms of chitosan beads. J Appl Polym Sci 2011. [DOI: 10.1002/app.35204] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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33
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Saravanan S, Nethala S, Pattnaik S, Tripathi A, Moorthi A, Selvamurugan N. Preparation, characterization and antimicrobial activity of a bio-composite scaffold containing chitosan/nano-hydroxyapatite/nano-silver for bone tissue engineering. Int J Biol Macromol 2011; 49:188-93. [DOI: 10.1016/j.ijbiomac.2011.04.010] [Citation(s) in RCA: 185] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2011] [Revised: 04/15/2011] [Accepted: 04/18/2011] [Indexed: 10/18/2022]
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34
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Jyoti MA, Song HY. Initial in vitro biocompatibility of a bone cement composite containing a poly-ε-caprolactone microspheres. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2011; 22:1333-1342. [PMID: 21479637 DOI: 10.1007/s10856-011-4311-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2010] [Accepted: 03/28/2011] [Indexed: 05/30/2023]
Abstract
The biocompatibility of a reinforced calcium phosphate injectable bone substitute (CPC-IBS) containing 30% poly-ε-caprolactone (PCL) microspheres was evaluated. The IBS consisted of a solution of chitosan and citric acid as the liquid phase and tetracalcium phosphate (TTCP) and dicalcium phosphate anhydrous (DCPA) powder as the solid phase with 30% PCL microspheres. The surface of the CPC-IBS was observed by SEM, and analyzed by EDX profiles. The initial setting of the sample was lower in the IBS containing 0% citric acid than in the IBS containing 10 or 20% citric acid. The compressive strength of the PCL-incorporated CPC-IBS was measured using a Universal Testing Machine. The 20% citric acid samples had the highest mechanical strength at day 12, which was dependent on both time and the citric acid concentration. The in vitro bioactivity experiments with simulated body fluid (SBF) confirmed the formation of apatite on the sample surfaces after 2, 7, and 14 days of incubation in SBF. Ca and P ion release profile by ICP method also confirmed apatite nucleation on the CPC-IBS surfaces. The in vitro biocompatibility of the CPC-IBS was evaluated by using MTT, cellular adhesion, and spreading studies. In vitro cytotoxicity tests by MTT assay showed that the 0 and 10% CPC-IBS was cytocompatible for fibroblast L-929 cells. The SEM micrograph confirmed that MG-63 cells maintained their phenotype on all of the CPC-IBS surfaces although cellular attachment was better in 0 and 10% CPC-IBS than 20% samples.
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Affiliation(s)
- M Anirban Jyoti
- Department of Immunology, School of Medicine, Soonchunhyang University, Cheonan, Chungnum, 330-090, South Korea
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Abstract
Progress and development in biosensor development will inevitably focus upon the technology of the nanomaterials that offer promise to solve the biocompatibility and biofouling problems. The biosensors using smart nanomaterials have applications for rapid, specific, sensitive, inexpensive, in-field, on-line and/or real-time detection of pesticides, antibiotics, pathogens, toxins, proteins, microbes, plants, animals, foods, soil, air, and water. Thus, biosensors are excellent analytical tools for pollution monitoring, by which implementation of legislative provisions to safeguard our biosphere could be made effectively plausible. The current trends and challenges with nanomaterials for various applications will have focus biosensor development and miniaturization. All these growing areas will have a remarkable influence on the development of new ultrasensitive biosensing devices to resolve the severe pollution problems in the future that not only challenges the human health but also affects adversely other various comforts to living entities. This review paper summarizes recent progress in the development of biosensors by integrating functional biomolecules with different types of nanomaterials, including metallic nanoparticles, semiconductor nanoparticles, magnetic nanoparticles, inorganic/organic hybrid, dendrimers, and carbon nanotubes/graphene.
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Affiliation(s)
- Ravindra P. Singh
- Nanotechnology Application Centre, University of Allahabad, Allahabad 211 002, India
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Skovstrup S, Hansen SG, Skrydstrup T, Schiøtt B. Conformational Flexibility of Chitosan: A Molecular Modeling Study. Biomacromolecules 2010; 11:3196-207. [DOI: 10.1021/bm100736w] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Søren Skovstrup
- Centre for Insoluble Protein Structures (inSPIN) and Interdisciplinary Nanoscience Centre (iNANO), Department of Chemistry, Aarhus University, 8000 Aarhus C, Denmark
| | - Signe Grann Hansen
- Centre for Insoluble Protein Structures (inSPIN) and Interdisciplinary Nanoscience Centre (iNANO), Department of Chemistry, Aarhus University, 8000 Aarhus C, Denmark
| | - Troels Skrydstrup
- Centre for Insoluble Protein Structures (inSPIN) and Interdisciplinary Nanoscience Centre (iNANO), Department of Chemistry, Aarhus University, 8000 Aarhus C, Denmark
| | - Birgit Schiøtt
- Centre for Insoluble Protein Structures (inSPIN) and Interdisciplinary Nanoscience Centre (iNANO), Department of Chemistry, Aarhus University, 8000 Aarhus C, Denmark
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Synthesis of nano-hydroxyapatite chitin/chitosan hybrid biocomposites for the removal of Fe(III). Carbohydr Polym 2010. [DOI: 10.1016/j.carbpol.2010.05.013] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Osorio-Madrazo A, David L, Trombotto S, Lucas JM, Peniche-Covas C, Domard A. Kinetics study of the solid-state acid hydrolysis of chitosan: evolution of the crystallinity and macromolecular structure. Biomacromolecules 2010; 11:1376-86. [PMID: 20402497 DOI: 10.1021/bm1001685] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
The heterogeneous hydrolysis of fully deacetylated chitosan solid samples was carried out with concentrated HCl. The hydrolysis kinetics was studied at different temperatures and HCl concentrations. From 5 to 50 degrees C in the hydrolysis time range up to 50 h, a monomodal distribution of molecular weights was observed connected to the only degradation of amorphous domains. Between 70 and 90 degrees C and for the hydrolysis longest times, a multimodal distribution appeared with the additional hydrolysis of the crystalline phase. The crystallinity index increased from 57 to 73% with the elimination and partial recrystallization of amorphous regions. X-ray diffraction patterns revealed the presence of the anhydrous polymorph, absent in the starting materials only containing the hydrated polymorph. The apparent crystallite width (from the Scherrer equation) of both the anhydrous and hydrated allomorphs did not vary significantly with time despite the increase in the fraction of anhydrous allomorph. Therefore, the hydrolysis in the solid state was complex, revealing several regimes. The activation energy parameters were deduced, and the mechanisms were discussed.
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Affiliation(s)
- Anayancy Osorio-Madrazo
- Laboratoire des Matériaux Polymères et des Biomatériaux, UMR CNRS 5223 IMP, Université de Lyon, F-69622 Villeurbanne Cedex, France
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Kashiwazaki H, Yamaguchi K, Harada N, Akazawa T, Murata M, Iizuka T, Ikoma T, Tanaka J, Inoue N. In vivo Evaluation of a Novel Chitosan/ HAp Composite Biomaterial as a Carrier of rhBMP-2. J HARD TISSUE BIOL 2010. [DOI: 10.2485/jhtb.19.181] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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40
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NOGUCHI K, KANENARI M, OKUYAMA K, OGAWA K. Intermolecular Interaction in Chitosan/Hydrogen Bromide Complex Based on X-Ray Fiber Diffraction. KOBUNSHI RONBUNSHU 2010. [DOI: 10.1295/koron.67.690] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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41
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Viswanathan N, Sundaram CS, Meenakshi S. Sorption behaviour of fluoride on carboxylated cross-linked chitosan beads. Colloids Surf B Biointerfaces 2009; 68:48-54. [DOI: 10.1016/j.colsurfb.2008.09.009] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2008] [Revised: 08/05/2008] [Accepted: 09/09/2008] [Indexed: 11/26/2022]
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42
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Xianmiao C, Yubao L, Yi Z, Li Z, Jidong L, Huanan W. Properties and in vitro biological evaluation of nano-hydroxyapatite/chitosan membranes for bone guided regeneration. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2009. [DOI: 10.1016/j.msec.2008.05.008] [Citation(s) in RCA: 151] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Watthanaphanit A, Supaphol P, Furuike T, Tokura S, Tamura H, Rujiravanit R. Novel Chitosan-Spotted Alginate Fibers from Wet-Spinning of Alginate Solutions Containing Emulsified Chitosan−Citrate Complex and their Characterization. Biomacromolecules 2008; 10:320-7. [DOI: 10.1021/bm801043d] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Anyarat Watthanaphanit
- The Petroleum and Petrochemical College and The Center of Excellence for Petroleum, Petrochemicals and Advanced Materials, Chulalongkorn University, Bangkok 10330, Thailand, and Faculty of Chemistry, Materials and Bioengineering, Kansai University, Osaka 564-8680, Japan
| | - Pitt Supaphol
- The Petroleum and Petrochemical College and The Center of Excellence for Petroleum, Petrochemicals and Advanced Materials, Chulalongkorn University, Bangkok 10330, Thailand, and Faculty of Chemistry, Materials and Bioengineering, Kansai University, Osaka 564-8680, Japan
| | - Tetsuya Furuike
- The Petroleum and Petrochemical College and The Center of Excellence for Petroleum, Petrochemicals and Advanced Materials, Chulalongkorn University, Bangkok 10330, Thailand, and Faculty of Chemistry, Materials and Bioengineering, Kansai University, Osaka 564-8680, Japan
| | - Seiichi Tokura
- The Petroleum and Petrochemical College and The Center of Excellence for Petroleum, Petrochemicals and Advanced Materials, Chulalongkorn University, Bangkok 10330, Thailand, and Faculty of Chemistry, Materials and Bioengineering, Kansai University, Osaka 564-8680, Japan
| | - Hiroshi Tamura
- The Petroleum and Petrochemical College and The Center of Excellence for Petroleum, Petrochemicals and Advanced Materials, Chulalongkorn University, Bangkok 10330, Thailand, and Faculty of Chemistry, Materials and Bioengineering, Kansai University, Osaka 564-8680, Japan
| | - Ratana Rujiravanit
- The Petroleum and Petrochemical College and The Center of Excellence for Petroleum, Petrochemicals and Advanced Materials, Chulalongkorn University, Bangkok 10330, Thailand, and Faculty of Chemistry, Materials and Bioengineering, Kansai University, Osaka 564-8680, Japan
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Hernández RB, Franco AP, Yola OR, López-Delgado A, Felcman J, Recio MAL, Mercê ALR. Coordination study of chitosan and Fe3+. J Mol Struct 2008. [DOI: 10.1016/j.molstruc.2007.07.024] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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45
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Kolyadina OA, Murinov KY, Kuramshina AR, Kabal’nova NN, Murinov YI. Adsorption properties of complexes of chitosan with copper and zinc chlorides and copper sulfate. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2006. [DOI: 10.1134/s0036024406120223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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46
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PreLALS Workbench: Visual Data Manipulation Workbench for WinLALS on Windows PCs. JOURNAL OF COMPUTER AIDED CHEMISTRY 2005. [DOI: 10.2751/jcac.6.12] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Noorjahan SE, Sastry TP. Physiologically clotted fibrin-calcined bone composite—A possible bone graft substitute. J Biomed Mater Res B Appl Biomater 2005; 75:343-50. [PMID: 16037965 DOI: 10.1002/jbm.b.30309] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Fibrin plays a major role in blood clotting and is important in wound healing. In the present study, physiologically clotted fibrin (PF) and calcined bone (CB) both of bovine origin were used in the preparation of a bone graft material with chitosan (C) as a binder. This bone graft (PF-CB) was characterized by stress-strain analysis, X-ray diffraction (XRD) studies, scanning electron microscopy, differential scanning calorimetry, thermogravimetric analysis, and FTIR spectroscopy. Thermal studies revealed that the incorporation of CB into PF did not alter the thermal stability of fibrin, although it affects the total loss percentage. The composition containing 24:1:15 (PF:C:CB) on dry weight basis exhibited maximum compressive strength, and the same composite was used for characterization studies. The XRD studies have shown the amorphous nature of the implant. SEM pictures revealed the heterogeneity and porous nature of the implant. PF in combination with CB is expected to exhibit osteoinductivity because fibrin, the osteoinductive protein, acts as an angiogenic factor, whereas CB provides calcium and phosphate ions that are needed for new bone formation.
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Affiliation(s)
- S E Noorjahan
- Bio-Products Laboratory, Central Leather Research Institute, Adyar, Chennai 600 020 Tamilnadu, India
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Matsuda A, Kasahara M, Kobayashi H, Ichinose N, Tanaka J. Compounding of hydroxyapatite crystals to molecularly aligned crab tendon chitosan: the effect of heat treatment. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2004. [DOI: 10.1016/j.msec.2004.08.048] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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49
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Abstract
Crystal structures of two polymorphs of chitosan, tendon (hydrated) and annealed (anhydrous) polymorphs, have been reported. In both crystals, chitosan molecule takes up similar conformation (Type I form) to each other, an extended two-fold helix stabilized by intramolecular O3-O5 hydrogen bond, which is also similar to the conformation of chitin or cellulose. Three chitosan conformations other than Type I form have been found in the crystals of chitosan-acid salts. In the salts with acetic and some other acids, called Type II salts, chitosan molecule takes up a relaxed two-fold helix composed of asymmetric unit of tetrasaccharide. This conformation seems to be unstable because no strong intramolecular hydrogen bond like Type I form. Type II crystal changes to the annealed polymorph of chitosan by a spontaneous water-removing action of the acid. Chitosan molecule in its hydrogen iodide salt prepared at low temperature takes a 4/1 helix with asymmetric unit of disaccharide. The fourth chitosan conformation was found to be a 5/3 helix in chitosan salts with medical organic acids having phenyl group such as salicylic or gentisic acids. Similar conformation of chitosan molecule in the aspirin (acetylsalicylic acid) salt was suggested by a solid-sate NMR measurement.
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Affiliation(s)
- Kozo Ogawa
- Research Institute for Advanced Science and Technology (RIAST), Osaka Prefecture University, Sakai, Osaka 599-8570, Japan.
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Lertworasirikul A, Yokoyama S, Noguchi K, Ogawa K, Okuyama K. Molecular and crystal structures of chitosan/HI type I salt determined by X-ray fiber diffraction. Carbohydr Res 2004; 339:825-33. [PMID: 14980826 DOI: 10.1016/j.carres.2004.01.001] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2003] [Accepted: 01/06/2004] [Indexed: 10/26/2022]
Abstract
The three-dimensional structure of chitosan/HI type I salt was determined by the X-ray fiber diffraction technique and linked-atom least-squares refinement method. Two polymer chains and four iodide ions (I(-)) crystallized in a monoclinic unit cell with dimensions a = 9.46(2), b = 9.79(2)], c (fiber axis)=10.33(2)A, beta = 105.2(2) degrees and a space group P2(1). Chitosan chains adopted an extended twofold helical conformation that was stabilized by O-3...O-5 hydrogen bonds, and the O-6 atom adopted nearly gt orientation. Polymer chains zigzag along the b-axis and directly connect to each other by N-2...O-6 hydrogen bonds. Two columns of iodide ions were shown to pack at the bending points of the zigzag sheets, and their locations are closely related to those of water columns in the hydrated chitosan. The iodide ions stabilized the salt structure by forming hydrogen bonds with the N-2 and O-6 atoms of the polymer chains together with an electrostatic interaction between N-2 and the iodide ions.
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Affiliation(s)
- Amornrat Lertworasirikul
- Faculty of Technology, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan
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