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      Evaluation of inherent properties of the carboxymethyl cellulose (CMC) for potential application in tissue engineering focusing on bone regeneration

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          Abstract

          Biomaterials are essential in medicine because these biological macromolecules have appropriately replaced classical tissue grafting techniques for their valuable features. Bone tissue engineering has persistently developed since “tissue engineering” was suggested. Carboxymethyl cellulose (CMC) is the first FDA‐approved water‐soluble derivative of cellulose that could be targeted for desired bone tissue graft. Numerous studies on CMC as a component created for bone tissue have recently been published. Because of its carboxylate groups, CMC is hydrophilic. CMC can crosslink with varied materials, such as synthetic and natural polymers, enabling innovative bone structure biomaterials. These carboxylate groups are responsible for in situ gelations and bio‐adhesion characteristics. In this review, the current progress and inherent characteristics of CMC‐based bone scaffold materials are discussed.

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          Recent advances in bone tissue engineering scaffolds.

          Bone disorders are of significant concern due to increase in the median age of our population. Traditionally, bone grafts have been used to restore damaged bone. Synthetic biomaterials are now being used as bone graft substitutes. These biomaterials were initially selected for structural restoration based on their biomechanical properties. Later scaffolds were engineered to be bioactive or bioresorbable to enhance tissue growth. Now scaffolds are designed to induce bone formation and vascularization. These scaffolds are often porous, made of biodegradable materials that harbor different growth factors, drugs, genes, or stem cells. In this review, we highlight recent advances in bone scaffolds and discuss aspects that still need to be improved. Copyright © 2012 Elsevier Ltd. All rights reserved.
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            On the mechanisms of biocompatibility.

            The manner in which a mutually acceptable co-existence of biomaterials and tissues is developed and sustained has been the focus of attention in biomaterials science for many years, and forms the foundation of the subject of biocompatibility. There are many ways in which materials and tissues can be brought into contact such that this co-existence may be compromised, and the search for biomaterials that are able to provide for the best performance in devices has been based upon the understanding of all the interactions within biocompatibility phenomena. Our understanding of the mechanisms of biocompatibility has been restricted whilst the focus of attention has been long-term implantable devices. In this paper, over 50 years of experience with such devices is analysed and it is shown that, in the vast majority of circumstances, the sole requirement for biocompatibility in a medical device intended for long-term contact with the tissues of the human body is that the material shall do no harm to those tissues, achieved through chemical and biological inertness. Rarely has an attempt to introduce biological activity into a biomaterial been clinically successful in these applications. This essay then turns its attention to the use of biomaterials in tissue engineering, sophisticated cell, drug and gene delivery systems and applications in biotechnology, and shows that here the need for specific and direct interactions between biomaterials and tissue components has become necessary, and with this a new paradigm for biocompatibility has emerged. It is believed that once the need for this change is recognised, so our understanding of the mechanisms of biocompatibility will markedly improve.
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              TEMPO-oxidized cellulose nanofibers.

              Native wood celluloses can be converted to individual nanofibers 3-4 nm wide that are at least several microns in length, i.e. with aspect ratios>100, by TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl radical)-mediated oxidation and successive mild disintegration in water. Preparation methods and fundamental characteristics of TEMPO-oxidized cellulose nanofibers (TOCN) are reviewed in this paper. Significant amounts of C6 carboxylate groups are selectively formed on each cellulose microfibril surface by TEMPO-mediated oxidation without any changes to the original crystallinity (∼74%) or crystal width of wood celluloses. Electrostatic repulsion and/or osmotic effects working between anionically-charged cellulose microfibrils, the ζ-potentials of which are approximately -75 mV in water, cause the formation of completely individualized TOCN dispersed in water by gentle mechanical disintegration treatment of TEMPO-oxidized wood cellulose fibers. Self-standing TOCN films are transparent and flexible, with high tensile strengths of 200-300 MPa and elastic moduli of 6-7 GPa. Moreover, TOCN-coated poly(lactic acid) films have extremely low oxygen permeability. The new cellulose-based nanofibers formed by size reduction process of native cellulose fibers by TEMPO-mediated oxidation have potential application as environmentally friendly and new bio-based nanomaterials in high-tech fields.
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                Author and article information

                Contributors
                (View ORCID Profile)
                Journal
                Polymers for Advanced Technologies
                Polymers for Advanced Techs
                Wiley
                1042-7147
                1099-1581
                January 2024
                December 07 2023
                January 2024
                : 35
                : 1
                Affiliations
                [1 ] Department of Tissue Engineering & Regenerative Medicine, Faculty of Advanced Technologies in Medicine Iran University of Medical Sciences Tehran Iran
                [2 ] Cellular and Molecular Research Center Iran University of Medical Sciences Tehran Iran
                [3 ] Department of Tissue Engineering and Applied Cell Sciences, School of Medicine Qom University of Medical Sciences Qom Iran
                [4 ] Department of Medical Laboratory Sciences, Faculty of Allied Medicine Iran University of Medical Sciences (IUMS) Tehran Iran
                [5 ] Department of Plastic and Reconstructive Surgery, Hazrat Fatemeh Hospital Iran University of Medical Sciences Tehran Iran
                [6 ] Faculty of Advanced Technologies in Medicine Iran University of Medical Sciences Tehran Iran
                Article
                10.1002/pat.6258
                cab3edf9-f8ec-4091-b618-3feffaa6a14f
                © 2024

                http://onlinelibrary.wiley.com/termsAndConditions#vor

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