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Shipovskaya AB, Ushakova OS, Volchkov SS, Shipenok XM, Shmakov SL, Gegel NO, Burov AM. Chiral Nanostructured Glycerohydrogel Sol-Gel Plates of Chitosan L- and D-Aspartate: Supramolecular Ordering and Optical Properties. Gels 2024; 10:427. [PMID: 39057450 PMCID: PMC11275427 DOI: 10.3390/gels10070427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2024] [Revised: 06/19/2024] [Accepted: 06/24/2024] [Indexed: 07/28/2024] Open
Abstract
A comprehensive study was performed on the supramolecular ordering and optical properties of thin nanostructured glycerohydrogel sol-gel plates based on chitosan L- and D-aspartate and their individual components in the X-ray, UV, visible, and IR ranges. Our comparative analysis of chiroptical characteristics, optical collimated transmittance, the average cosine of the scattering angle, microrelief and surface asymmetry, and the level of structuring shows a significant influence of the wavelength range of electromagnetic radiation and the enantiomeric form of aspartic acid on the functional characteristics of the sol-gel materials. At the macrolevel of the supramolecular organization, a complex topography of the surface layer and a dense amorphous-crystalline ordering of polymeric substances were revealed, while at the nanolevel, there were two forms of voluminous scattering domains: nanospheres with diameters of 60-120 nm (L-) and 45-55 nm (D-), anisometric particles of lengths within ~100-160 (L-) and ~85-125 nm (D-), and widths within ~10-20 (L-) and ~20-30 nm (D-). The effect of optical clearing on glass coated with a thin layer of chitosan L-(D-)aspartate in the near-UV region was discovered (observed for the first time for chitosan-based materials). The resulting nanocomposite shape-stable glycerohydrogels seem promising for sensorics and photonics.
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Affiliation(s)
- Anna B. Shipovskaya
- Institute of Chemistry, Saratov State University, Saratov 410012, Russia; (A.B.S.); (O.S.U.); (X.M.S.); (N.O.G.)
| | - Olga S. Ushakova
- Institute of Chemistry, Saratov State University, Saratov 410012, Russia; (A.B.S.); (O.S.U.); (X.M.S.); (N.O.G.)
| | - Sergei S. Volchkov
- Department of Physics, Yuri Gagarin Saratov State Technical University, Saratov 410054, Russia;
- Saratov Branch, Institute of Radio Engineering and Electronics of Russian Academy of Sciences, 38 Zelyonaya St., Saratov 410019, Russia
| | - Xenia M. Shipenok
- Institute of Chemistry, Saratov State University, Saratov 410012, Russia; (A.B.S.); (O.S.U.); (X.M.S.); (N.O.G.)
| | - Sergei L. Shmakov
- Institute of Chemistry, Saratov State University, Saratov 410012, Russia; (A.B.S.); (O.S.U.); (X.M.S.); (N.O.G.)
| | - Natalia O. Gegel
- Institute of Chemistry, Saratov State University, Saratov 410012, Russia; (A.B.S.); (O.S.U.); (X.M.S.); (N.O.G.)
| | - Andrey M. Burov
- Institute of Biochemistry and Physiology of Plants and Microorganisms, Saratov Scientific Centre of the Russian Academy of Sciences, Saratov 410049, Russia;
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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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Abstract
In this study, bioactive composite systems based on natural polymers (chitosan and lignin) were prepared in this study. The structural, mechanical, and morphological properties of chitosan-based materials containing various amounts of lignin filler were investigated. The infra-red IR spectroscopy data confirmed the formation of chemical bonds between the components of the obtained composites. The mechanical properties of film samples were studied in air and in physiological solution. It was demonstrated that the breaking elongation values of the obtained film samples in the wet state were higher (150–160%) than the corresponding (average) value of a pure chitosan film (100%). The scanning electron microscopy and atomic force microscopy data demonstrated that the introduction of lignin had caused significant changes in the surface morphology of films. The appearance of a strongly pronounced texture and porosity facilitated cell proliferation on the surface of composites, i.e., the bioactivity of film samples was enhanced with an increasing lignin content in the chitosan matrix.
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Eulálio HYC, Vieira M, Fideles TB, Tomás H, Silva SML, Peniche CA, Fook MVL. Physicochemical Properties and Cell Viability of Shrimp Chitosan Films as Affected by Film Casting Solvents. I-Potential Use as Wound Dressing. MATERIALS (BASEL, SWITZERLAND) 2020; 13:E5005. [PMID: 33172010 PMCID: PMC7664222 DOI: 10.3390/ma13215005] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Revised: 10/10/2020] [Accepted: 10/12/2020] [Indexed: 11/26/2022]
Abstract
Chitosan solubility in aqueous organic acids has been widely investigated. However, most of the previous works have been done with plasticized chitosan films and using acetic acid as the film casting solvent. In addition, the properties of these films varied among studies, since they are influenced by different factors such as the chitin source used to produce chitosan, the processing variables involved in the conversion of chitin into chitosan, chitosan properties, types of acids used to dissolve chitosan, types and amounts of plasticizers and the film preparation method. Therefore, this work aimed to prepare chitosan films by the solvent casting method, using chitosan derived from Litopenaeus vannamei shrimp shell waste, and five different organic acids (acetic, lactic, maleic, tartaric, and citric acids) without plasticizer, in order to evaluate the effect of organic acid type and chitosan source on physicochemical properties, degradation and cytotoxicity of these chitosan films. The goal was to select the best suited casting solvent to develop wound dressing from shrimp chitosan films. Shrimp chitosan films were analyzed in terms of their qualitative assessment, thickness, water vapor permeability (WVP), water vapor transmission rate (WVTR), wettability, tensile properties, degradation in phosphate buffered saline (PBS) and cytotoxicity towards human fibroblasts using the resazurin reduction method. Regardless of the acid type employed in film preparation, all films were transparent and slightly yellowish, presented homogeneous surfaces, and the thickness was compatible with the epidermis thickness. However, only the ones prepared with maleic acid presented adequate characteristics of WVP, WVTR, wettability, degradability, cytotoxicity and good tensile properties for future application as a wound dressing material. The findings of this study contributed not only to select the best suited casting solvent to develop chitosan films for wound dressing but also to normalize a solubilization protocol for chitosan, derived from Litopenaeus vannamei shrimp shell waste, which can be used in the pharmaceutical industry.
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Affiliation(s)
- Hugo Yves C. Eulálio
- Departamento de Engenharia de Materiais, Universidade Federal de Campina Grande, Campina Grande 58429-900, PB, Brazil; (H.Y.C.E.); (S.M.L.S.)
| | - Mariana Vieira
- Centro de Química da Madeira, Universidade da Madeira, Campus da Penteada, 9020-105 Funchal, Portugal; (M.V.); (H.T.)
| | - Thiago B. Fideles
- Coordenação Geral de Inovação Tecnológica na Saúde-CGITS, Departamento de Gestão e Incorporação de Tecnologias e Inovação em Saúde-DGITIS da Secretaria de Ciência, Tecnologia e Insumos Estratégicos do Ministério da Saúde SCTIE/MS, 70058-900 Brasília, Brazil;
| | - Helena Tomás
- Centro de Química da Madeira, Universidade da Madeira, Campus da Penteada, 9020-105 Funchal, Portugal; (M.V.); (H.T.)
| | - Suédina M. L. Silva
- Departamento de Engenharia de Materiais, Universidade Federal de Campina Grande, Campina Grande 58429-900, PB, Brazil; (H.Y.C.E.); (S.M.L.S.)
| | - Carlos A. Peniche
- Centro de Biomateriales, Universidad de La Habana, 10400 La Habana, Cuba;
| | - Marcus Vinícius L. Fook
- Departamento de Engenharia de Materiais, Universidade Federal de Campina Grande, Campina Grande 58429-900, PB, Brazil; (H.Y.C.E.); (S.M.L.S.)
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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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Bazmandeh AZ, Mirzaei E, Fadaie M, Shirian S, Ghasemi Y. Dual spinneret electrospun nanofibrous/gel structure of chitosan-gelatin/chitosan-hyaluronic acid as a wound dressing: In-vitro and in-vivo studies. Int J Biol Macromol 2020; 162:359-373. [PMID: 32574734 DOI: 10.1016/j.ijbiomac.2020.06.181] [Citation(s) in RCA: 58] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Revised: 06/18/2020] [Accepted: 06/18/2020] [Indexed: 11/24/2022]
Abstract
Structural and compositional similarity to the natural extracellular matrix (ECM) is a main characteristic of an ideal scaffold for tissue regeneration. In order to resemble the fibrous/gel structure of skin ECM, a multicomponent scaffold was fabricated using biopolymers with structural similarity to ECM and wound healing properties i.e., chitosan (CS), gelatin (Gel) and hyaluronic acid (HA). The CS-Gel and CS-HA nanofibers were simultaneously electrospun on the collector through dual-electrospinning technique. The presence of polymers, possible interactions, and formation of polyelectrolyte complex were proven by attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy and thermogravimetric analysis (TGA). The noncomplex component of CS-HA fibers formed a gel state when the scaffold was exposed to the aqueous media, while the CS-Gel fibers reserved their fibrous structure, resulting in formation of fibrous/gel structure. The CS-Gel/CS-HA scaffold showed significantly higher cell proliferation (109%) in the first 24 h comparing with CS (90%) and CS-Gel (96%) scaffolds. Additionally, the initial cell adhesion improved by incorporation of HA. The in-vivo wound healing results in rat elucidated more wound healing capability of the CS-Gel/CS-HA scaffold in which new tissue with most similarity to the normal skin was formed.
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Affiliation(s)
- Abbas Zakeri Bazmandeh
- Department of Medical Nanotechnology, School of Advanced Medical Sciences and Technologies, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Esmaeil Mirzaei
- Department of Medical Nanotechnology, School of Advanced Medical Sciences and Technologies, Shiraz University of Medical Sciences, Shiraz, Iran.
| | - Milad Fadaie
- Pharmaceutical Sciences Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Sadegh Shirian
- Department of Pathology, School of Veterinary Medicine, Shahrekord University, Shahrekord, Iran; Shiraz Molecular Pathology Research Center, Dr Daneshbod Path Lab, Shiraz, Iran; Shefa Neuroscience Research Center, Tehran, Iran
| | - Younes Ghasemi
- Pharmaceutical Sciences Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
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Smirnov MA, Nikolaeva AL, Vorobiov VK, Bobrova NV, Abalov IV, Smirnov AV, Sokolova MP. Ionic Conductivity and Structure of Chitosan Films Modified with Lactic Acid-Choline Chloride NADES. Polymers (Basel) 2020; 12:E350. [PMID: 32041166 PMCID: PMC7077437 DOI: 10.3390/polym12020350] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2020] [Revised: 01/31/2020] [Accepted: 02/02/2020] [Indexed: 01/06/2023] Open
Abstract
The natural deep eutectic solvent (NADES) based on choline chloride (ChCl) and lactic acid (LA) was used for the preparation of chitosan (CS) films by the solution casting method. The content of NADES in films was from 0 to 82 wt%. The impact of NADES on the morphology and crystalline structure of films was investigated using scanning electron microscopy as well as wide-angle and small-angle X-ray scattering. The experimental results allow to propose CS chains swelling in NADES. FTIR spectroscopy confirms the interactions between CS and NADES components via the formation of hydrogen and ion bonds. The thermal properties of the composite films were studied by simultaneous thermogravimetric and differential thermal analysis. Thermomechanical analysis demonstrated appearance of two transitions at temperatures between -23 and -5 °C and 54-102 °C depending on NADES content. It was found that electrical conductivity of film with 82 wt% of NADES reaches 1.7 mS/cm. The influence of the composition and structure of films on the charge carriers concentration and their mobility is discussed.
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Affiliation(s)
- Mikhail A. Smirnov
- Institute of Macromolecular Compounds Russian Academy of Sciences, Bolshoy pr. 31, Saint Petersburg 199004, Russia; (M.A.S.); (A.L.N.); (V.K.V.); (N.V.B.); (I.V.A.)
| | - Alexandra L. Nikolaeva
- Institute of Macromolecular Compounds Russian Academy of Sciences, Bolshoy pr. 31, Saint Petersburg 199004, Russia; (M.A.S.); (A.L.N.); (V.K.V.); (N.V.B.); (I.V.A.)
| | - Vitaly K. Vorobiov
- Institute of Macromolecular Compounds Russian Academy of Sciences, Bolshoy pr. 31, Saint Petersburg 199004, Russia; (M.A.S.); (A.L.N.); (V.K.V.); (N.V.B.); (I.V.A.)
| | - Natalia V. Bobrova
- Institute of Macromolecular Compounds Russian Academy of Sciences, Bolshoy pr. 31, Saint Petersburg 199004, Russia; (M.A.S.); (A.L.N.); (V.K.V.); (N.V.B.); (I.V.A.)
| | - Ivan V. Abalov
- Institute of Macromolecular Compounds Russian Academy of Sciences, Bolshoy pr. 31, Saint Petersburg 199004, Russia; (M.A.S.); (A.L.N.); (V.K.V.); (N.V.B.); (I.V.A.)
| | - Alexander V. Smirnov
- Physics and Technology Faculty, ITMO University, Kronverskii prosp. 49, Saint Petersburg 197101, Russia;
| | - Maria P. Sokolova
- Institute of Macromolecular Compounds Russian Academy of Sciences, Bolshoy pr. 31, Saint Petersburg 199004, Russia; (M.A.S.); (A.L.N.); (V.K.V.); (N.V.B.); (I.V.A.)
- Saint Petersburg State University, Institute of Chemistry, Universitetskaya nab. 7-9, Saint Petersburg 198504, Russia
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Baklagina YG, Klechkovskaya VV, Kononova SV, Petrova VA, Poshina DN, Orekhov AS, Skorik YA. Polymorphic Modifications of Chitosan. CRYSTALLOGR REP+ 2018. [DOI: 10.1134/s1063774518030033] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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9
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Solodovnik T, Stolyarenko H, Slis A, Kultenko V. STUDY OF HEAT TREATMENT EFFECT ON STRUCTURE AND SOLUBILITY OF CHITOSAN FILMS. CHEMISTRY & CHEMICAL TECHNOLOGY 2017. [DOI: 10.23939/chcht11.02.175] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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10
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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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Tian D, Li L, Yuan LJ, Chen SP. Hydrous salts of 1-aminoethylidenediphosphonic acid and piperazidine: temperature induced reversible structural transformation in a humid environment. RSC Adv 2016. [DOI: 10.1039/c5ra22428d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
A series of hydrous salts constructed using AEDPH4 and piperazidine (pip) were synthesized and structurally characterized. A reversible structural transformation circle is observed in single crystals of compounds 1–3.
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Affiliation(s)
- Di Tian
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan 430072
- P. R. China
| | - Lang Li
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan 430072
- P. R. China
| | - Liang-jie Yuan
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan 430072
- P. R. China
| | - Shuo-ping Chen
- College of Materials Science and Engineering
- Guilin University of Technology
- Guilin 541004
- P. R. China
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Jung J, Cavender G, Zhao Y. The contribution of acidulant to the antibacterial activity of acid soluble α- and β-chitosan solutions and their films. Appl Microbiol Biotechnol 2013; 98:425-35. [DOI: 10.1007/s00253-013-5334-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2013] [Revised: 09/30/2013] [Accepted: 10/13/2013] [Indexed: 11/28/2022]
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YOSHIKAWA Y, NARITA T, OSAWA S. A Chitosan Nanofiber Suspension Wound-Healing Dressing Provides Sustained Release of a Therapeutic Agent. KOBUNSHI RONBUNSHU 2013. [DOI: 10.1295/koron.70.668] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Chen JL, Zhao Y. Effect of Molecular Weight, Acid, and Plasticizer on the Physicochemical and Antibacterial Properties of β-Chitosan Based Films. J Food Sci 2012; 77:E127-36. [DOI: 10.1111/j.1750-3841.2012.02686.x] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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15
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He Q, Ao Q, Gong Y, Zhang X. Preparation of chitosan films using different neutralizing solutions to improve endothelial cell compatibility. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2011; 22:2791-2802. [PMID: 22042456 DOI: 10.1007/s10856-011-4444-y] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2011] [Accepted: 09/05/2011] [Indexed: 05/31/2023]
Abstract
The development of chitosan-based constructs for application in large-size defects or highly vascularized tissues is still a challenging issue. The poor endothelial cell compatibility of chitosan hinders the colonization of vascular endothelial cells in the chitosan-based constructs, and retards the establishment of a functional microvascular network following implantation. The aim of the present study is to prepare chitosan films with different neutralization methods to improve their endothelial cell compatibility. Chitosan salt films were neutralized with either sodium hydroxide (NaOH) aqueous solution, NaOH ethanol solution, or ethanol solution without NaOH. The physicochemical properties and endothelial cell compatibility of the chitosan films were investigated. Results indicated that neutralization with different solutions affected the surface chemistry, swelling ratio, crystalline conformation, nanotopography, and mechanical properties of the chitosan films. The NaOH ethanol solution-neutralized chitosan film (Chi-NaOH/EtOH film) displayed a nanofiber-dominant surface, while the NaOH aqueous solution-neutralized film (Chi-NaOH/H(2)O film) and the ethanol solution-neutralized film (Chi-EtOH film) displayed nanoparticle-dominant surfaces. Moreover, the Chi-NaOH/EtOH films exhibited a higher stiffness as compared to the Chi-NaOH/H(2)O and Chi-EtOH films. Endothelial cell compatibility of the chitosan films was evaluated with a human microvascular endothelial cell line, HMEC-1. Compared with the Chi-NaOH/H(2)O and Chi-EtOH films, HMECs cultured on the Chi-NaOH/EtOH films fully spread and exhibited significantly higher levels of adhesion and proliferation, with retention of the endothelial phenotype and function. Our findings suggest that the surface nanotopography and mechanical properties contribute to determining the endothelial cell compatibility of chitosan films. The nature of the neutralizing solutions can affect the physicochemical properties and endothelial cell compatibility of chitosan films. Therefore, selection of suitable neutralization methods is highly important for the application of chitosan in tissue engineering.
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Affiliation(s)
- Qing He
- State Key Laboratory of Biomembrane and Membrane Biotechnology, School of Life Sciences, Tsinghua University, Beijing, China
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Majd S, Yuan Y, Mishra S, Haggard WO, Bumgardner JD. Effects of material property and heat treatment on nanomechanical properties of chitosan films. J Biomed Mater Res B Appl Biomater 2008; 90:283-9. [DOI: 10.1002/jbm.b.31284] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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17
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Khodaei S, Hadipour NL, Kasaai MR. Theoretical investigation of hydrogen bonding effects on oxygen, nitrogen, and hydrogen chemical shielding and electric field gradient tensors of chitosan/HI salt. Carbohydr Res 2007; 342:2396-403. [PMID: 17707780 DOI: 10.1016/j.carres.2007.07.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2007] [Revised: 07/04/2007] [Accepted: 07/12/2007] [Indexed: 11/26/2022]
Abstract
A density functional theory study has been carried out to calculate the (17)O, (15)N, (13)C, and (1)H chemical shielding as well as (17)O, (14)N, and (2)H electric field gradient tensors of chitosan/HI type I salt. These calculations were performed using the B3LYP functional and 6-311++G (d,p) and 6-31++G (d,p) basis sets. Calculated EFG and chemical shielding tensors were used to evaluate the (17)O, (14)N, and (2)H nuclear quadruple resonance, NQR, and (17)O, (15)N, (13)C, and (1)H nuclear magnetic resonance, NMR, parameters in the cluster model, which are in good agreement with the available experimental data. The difference in the isotropic shielding (sigma(iso)) and quadrupole coupling constant (C(Q)) between monomer and target molecule in the cluster was analyzed in detail. It was shown that both EFG and CS tensors are sensitive to hydrogen-bonding interactions, and calculating both tensors is an advantage. A different influence of various hydrogen bond types, N-Hcdots, three dots, centeredI, O-Hcdots, three dots, centeredI, and N-Hcdots, three dots, centeredO was observed on the calculated CS and EFG tensors. On the basis of this study, nitrogen and O-6 are the most important nuclei to confirm crystalline structure of chitosan/HI. These nuclei have large change in their CS and EFG tensors because of forming intermolecular hydrogen bonds. Moreover, the quantum chemical calculations indicated that the intermolecular hydrogen-bonding interactions play an essential role in determining the relative orientation of CS and EFG tensors of O-6 and nitrogen atoms in the molecular frame axes.
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Affiliation(s)
- Sajjad Khodaei
- Department of Chemistry, Tarbiat Modares University, PO Box 14115-175, Tehran, Iran
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Suzuki S, Shimahashi K, Takahara J, Sunako M, Takaha T, Ogawa K, Kitamura S. Effect of Addition of Water-Soluble Chitin on Amylose Film. Biomacromolecules 2005; 6:3238-42. [PMID: 16283751 DOI: 10.1021/bm050486h] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Amylose films blended with chitosan, which were free from additives such as acid, salt, and plasticizer, were prepared by casting mixtures of an aqueous solution of an enzymatically synthesized amylose and that of water-soluble chitin (44.1% deacetylated). The presence of a small amount of chitin (less than 10%) increased significantly the permeability of gases (N2, O2, CO2, C2H4) and improved the mechanical parameters of amylose film; particularly, the elastic modulus and elongation of the blend films were larger than those of amylose or chitin films. No antibacterial activity was observed with either amylose or water-soluble chitin films. But amylose films having a small amount of chitin showed strong antibacterial action, suggesting a morphological change in water-soluble chitin on the film surface by blending with amylose molecule. These facts suggested the presence of a molecular complex of amylose and chitosan.
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Affiliation(s)
- Shiho Suzuki
- Graduate School of Life & Environmental Sciences, Osaka Prefecture University, 1-1 Gakuen-cho, Sakai, Osaka, 599-8531 Japan
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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, Noguchi K, Ogawa K, Okuyama K. Plausible molecular and crystal structures of chitosan/HI type II salt. Carbohydr Res 2004; 339:835-43. [PMID: 14980827 DOI: 10.1016/j.carres.2004.01.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2003] [Accepted: 01/06/2004] [Indexed: 10/26/2022]
Abstract
Chitosan/HI type II salt prepared from crab tendon was investigated by X-ray fiber diffraction. Two polymer chains and 16 iodide ions (I(-)) crystallized in a tetragonal unit cell with lattice parameters of a = b = 10.68(3), c (fiber axis) = 40.77(13) A, and a space group P4(1). Chitosan forms a fourfold helix with a 40.77 A fiber period having a disaccharide as the helical asymmetric unit. One of the O-3... O-5 intramolecular hydrogen bonds at the glycosidic linkage is weakened by interacting with iodide ions, which seems to cause the polymer to take the 4/1-helical symmetry rather than the extended 2/1-helix. The plausible orientations of two O-6 atoms in the helical asymmetric unit were found to be gt and gg. Two chains are running through at the corner and the center of the unit cell along the c-axis. They are linked by hydrogen bonds between N-21 and O-61 atoms. Two out of four independent iodide ions are packed between the corner chains while the other two are packed between the corner and center chains when viewing through the ab-plane. The crystal structure of the salt is stabilized by hydrogen bonds between these iodide ions and N-21, N-22, O-32, O-61, O-62 of the polymer chains.
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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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Lertworasirikul A, Tsue SI, Noguchi K, Okuyama K, Ogawa K. Two different molecular conformations found in chitosan type II salts. Carbohydr Res 2003; 338:1229-33. [PMID: 12747866 DOI: 10.1016/s0008-6215(03)00145-9] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
The type II structure of chitosan acidic salts prepared from crab tendon in solid state was studied using an X-ray fiber diffraction technique together with the linked-atom least-squares (LALS) technique. The cylindrical Patterson method was applied to confirm the molecular conformation of the chitosan. It was shown that there are two different helical conformations for type II salts. One is the relaxed twofold helix having a tetrasaccharide as an asymmetric unit as found in chitosan.HCl salt, which was previously reported as a conformation of chitosan.HCOOH salt. The other is the fourfold helix having a disaccharide as an asymmetric unit newly found in chitosan.HI salt.
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Affiliation(s)
- Amornrat Lertworasirikul
- Faculty of Technology, Tokyo University of Agriculture and Technology, Koganei, 184-8588, Tokyo, Japan
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