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Gürer F, Mohan T, Bračič M, Barlič A, Makuc D, Plavec J, Kleinschek KS, Kargl R. Hyaluronic acid conjugates of glycine peptides and L-tryptophan. Int J Biol Macromol 2024; 274:133301. [PMID: 38914403 DOI: 10.1016/j.ijbiomac.2024.133301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2024] [Revised: 06/03/2024] [Accepted: 06/04/2024] [Indexed: 06/26/2024]
Abstract
This work reports about the conjugation of glycine C-terminal ethyl and methyl ester peptides and L-tryptophan methyl ester with sodium hyaluronate in aqueous solutions using the peptide coupling agent DMTMM (or short DMT, 4-(4,6-dimethoxy-1,3,5-triazin-2-yl)-4-methyl-morpholinium chloride). Detailed infrared (IR) absorbance and 1H and 13C (2D) NMR studies (heteronuclear multi-bond correlation spectroscopy, HMBC) confirmed covalent and regioselective amide bonds with the D-glucuronate, but also proves the presence of DMT traces in all conjugates. The ethyl ester`s methyl protons on the peptides` C-terminal could be used to quantify the degree of substitution of the peptide on the hyaluronate scaffold by NMR. The ester group also proved stable during conjugation and work-up, and could in some cases be selectively cleaved in water whilst leaving the amide bond intact as shown by potentiometric charge titration, NMR and IR. The conjugates did not influence the capability of human umbilical vein endothelial cells (HUVECs) to reduce MTS (5-[3-(carboxymethoxy)phenyl]-3-(4,5-dimethyl-2-thiazolyl)-2-(4-sulfophenyl)-2H-tetrazolium inner salt) to a formazan dye, which points towards a low cytotoxicity for the obtained products. The conjugation method and products could be tested for tissue engineering gels or drug delivery purposes with alternative, biologically active peptides.
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Affiliation(s)
- Fazilet Gürer
- Laboratory for Characterization and Processing of Polymers (LCPP), Faculty of Mechanical Engineering, University of Maribor, Smetanova ulica 17, SI - 2000 Maribor, Slovenia
| | - Tamilselvan Mohan
- Laboratory for Characterization and Processing of Polymers (LCPP), Faculty of Mechanical Engineering, University of Maribor, Smetanova ulica 17, SI - 2000 Maribor, Slovenia; Institute for Chemistry and Technology of Biobased System, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
| | - Matej Bračič
- Laboratory for Characterization and Processing of Polymers (LCPP), Faculty of Mechanical Engineering, University of Maribor, Smetanova ulica 17, SI - 2000 Maribor, Slovenia
| | - Ariana Barlič
- Educell, Podjetje Za Celično Biologijo, d.o.o. Prevale 9, 1236 Trzin, Slovenia
| | - Damjan Makuc
- Slovenian NMR Centre, National Institute of Chemistry, Hajdrihova 19, SI-1000 Ljubljana, Slovenia; EN-FIST Centre of Excellence, Trg Osvobodilne fronte 13, 1000 Ljubljana, Slovenia
| | - Janez Plavec
- Slovenian NMR Centre, National Institute of Chemistry, Hajdrihova 19, SI-1000 Ljubljana, Slovenia; EN-FIST Centre of Excellence, Trg Osvobodilne fronte 13, 1000 Ljubljana, Slovenia; Faculty of Chemistry and Chemical Technology, University of Ljubljana, Večna pot 113, SI-1000 Ljubljana, Slovenia
| | - Karin Stana Kleinschek
- Institute for Chemistry and Technology of Biobased System, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria.
| | - Rupert Kargl
- Laboratory for Characterization and Processing of Polymers (LCPP), Faculty of Mechanical Engineering, University of Maribor, Smetanova ulica 17, SI - 2000 Maribor, Slovenia; Institute for Chemistry and Technology of Biobased System, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria.
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Tamo AK, Djouonkep LDW, Selabi NBS. 3D Printing of Polysaccharide-Based Hydrogel Scaffolds for Tissue Engineering Applications: A Review. Int J Biol Macromol 2024; 270:132123. [PMID: 38761909 DOI: 10.1016/j.ijbiomac.2024.132123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Revised: 05/02/2024] [Accepted: 05/04/2024] [Indexed: 05/20/2024]
Abstract
In tissue engineering, 3D printing represents a versatile technology employing inks to construct three-dimensional living structures, mimicking natural biological systems. This technology efficiently translates digital blueprints into highly reproducible 3D objects. Recent advances have expanded 3D printing applications, allowing for the fabrication of diverse anatomical components, including engineered functional tissues and organs. The development of printable inks, which incorporate macromolecules, enzymes, cells, and growth factors, is advancing with the aim of restoring damaged tissues and organs. Polysaccharides, recognized for their intrinsic resemblance to components of the extracellular matrix have garnered significant attention in the field of tissue engineering. This review explores diverse 3D printing techniques, outlining distinctive features that should characterize scaffolds used as ideal matrices in tissue engineering. A detailed investigation into the properties and roles of polysaccharides in tissue engineering is highlighted. The review also culminates in a profound exploration of 3D polysaccharide-based hydrogel applications, focusing on recent breakthroughs in regenerating different tissues such as skin, bone, cartilage, heart, nerve, vasculature, and skeletal muscle. It further addresses challenges and prospective directions in 3D printing hydrogels based on polysaccharides, paving the way for innovative research to fabricate functional tissues, enhancing patient care, and improving quality of life.
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Affiliation(s)
- Arnaud Kamdem Tamo
- Institute of Microsystems Engineering IMTEK, University of Freiburg, 79110 Freiburg, Germany; Freiburg Center for Interactive Materials and Bioinspired Technologies FIT, University of Freiburg, 79110 Freiburg, Germany; Freiburg Materials Research Center FMF, University of Freiburg, 79104 Freiburg, Germany; Ingénierie des Matériaux Polymères (IMP), Université Claude Bernard Lyon 1, INSA de Lyon, Université Jean Monnet, CNRS, UMR 5223, 69622 Villeurbanne CEDEX, France.
| | - Lesly Dasilva Wandji Djouonkep
- College of Petroleum Engineering, Yangtze University, Wuhan 430100, China; Key Laboratory of Drilling and Production Engineering for Oil and Gas, Wuhan 430100, China
| | - Naomie Beolle Songwe Selabi
- Institute of Advanced Materials and Nanotechnology, Wuhan University of Science and Technology, Wuhan 430081, China
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Ding P, Ding X, Li J, Guo W, Okoro OV, Mirzaei M, Sun Y, Jiang G, Shavandi A, Nie L. Facile preparation of self-healing hydrogels based on chitosan and PVA with the incorporation of curcumin-loaded micelles for wound dressings. Biomed Mater 2024; 19:025021. [PMID: 38215487 DOI: 10.1088/1748-605x/ad1df9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Accepted: 01/12/2024] [Indexed: 01/14/2024]
Abstract
The increased demand for improved strategies for wound healing has, in recent years, motivated the development of multifunctional hydrogels with favorable bio-compatibility and antibacterial properties. To this regard, the current study presented the design of a novel self-healing composite hydrogel that could perform as wound dressing for the promotion of wound healing. The composite hydrogels were composed of polyvinyl alcohol (PVA), borax and chitosan functionalized with sialic acid (SA-CS) and curcumin loaded pluronic F127 micelles. The hydrogels were formed through the boronic ester bond formation between PVA, SA-CS and borax under physiological conditions and demonstrated adjustable mechanical properties, gelation kinetics and antibacterial properties. When incubating with NIH3T3 cells, the hydrogels also demonstrated good biocompatibility. These aspects offer a promising foundation for their prospective applications in developing clinical materials for wound healing.
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Affiliation(s)
- Peng Ding
- School of Life Science, Xinyang Normal University, Xinyang 464000, People's Republic of China
- Tea Plant Biology Key Laboratory of Henan Province, Xinyang Normal University, Xinyang 464000, People's Republic of China
| | - Xiaoyue Ding
- School of Life Science, Xinyang Normal University, Xinyang 464000, People's Republic of China
| | - Jingyu Li
- School of Life Science, Xinyang Normal University, Xinyang 464000, People's Republic of China
| | - Wei Guo
- School of Life Science, Xinyang Normal University, Xinyang 464000, People's Republic of China
| | - Oseweuba Valentine Okoro
- Université libre de Bruxelles (ULB), École polytechnique de Bruxelles-BioMatter unit, Avenue F.D. Roosevelt, 50-CP 165/61, 1050 Brussels, Belgium
| | - Mahta Mirzaei
- Centre for Food Chemistry and Technology, Ghent University Global Campus, Incheon, Republic of Korea
- Department of Food Technology, Safety and Health, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, geb. A, B-9000 Ghent, Belgium
| | - Yanfang Sun
- School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, People's Republic of China
| | - Guohua Jiang
- International Scientific and Technological Cooperation Base of Intelligent Biomaterials and Functional Fibers, Zhejiang Sci-Tech University, Hangzhou 310018, People's Republic of China
- Centre for Food Chemistry and Technology, Ghent University Global Campus, Incheon, South Korea
| | - Amin Shavandi
- Université libre de Bruxelles (ULB), École polytechnique de Bruxelles-BioMatter unit, Avenue F.D. Roosevelt, 50-CP 165/61, 1050 Brussels, Belgium
| | - Lei Nie
- School of Life Science, Xinyang Normal University, Xinyang 464000, People's Republic of China
- Tea Plant Biology Key Laboratory of Henan Province, Xinyang Normal University, Xinyang 464000, People's Republic of China
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Ghaffari-Bohlouli P, Jafari H, Okoro OV, Alimoradi H, Nie L, Jiang G, Kakkar A, Shavandi A. Gas Therapy: Generating, Delivery, and Biomedical Applications. SMALL METHODS 2024:e2301349. [PMID: 38193272 DOI: 10.1002/smtd.202301349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 12/11/2023] [Indexed: 01/10/2024]
Abstract
Oxygen (O2 ), nitric oxide (NO), carbon monoxide (CO), hydrogen sulfide (H2 S), and hydrogen (H2 ) with direct effects, and carbon dioxide (CO2 ) with complementary effects on the condition of various diseases are known as therapeutic gases. The targeted delivery and in situ generation of these therapeutic gases with controllable release at the site of disease has attracted attention to avoid the risk of gas poisoning and improve their performance in treating various diseases such as cancer therapy, cardiovascular therapy, bone tissue engineering, and wound healing. Stimuli-responsive gas-generating sources and delivery systems based on biomaterials that enable on-demand and controllable release are promising approaches for precise gas therapy. This work highlights current advances in the design and development of new approaches and systems to generate and deliver therapeutic gases at the site of disease with on-demand release behavior. The performance of the delivered gases in various biomedical applications is then discussed.
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Affiliation(s)
- Pejman Ghaffari-Bohlouli
- 3BIO-BioMatter, École polytechnique de Bruxelles, Université Libre de Bruxelles (ULB), Avenue F.D. Roosevelt, 50-CP 165/61, Brussels, 1050, Belgium
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montréal, Québec, H3A 0B8, Canada
| | - Hafez Jafari
- 3BIO-BioMatter, École polytechnique de Bruxelles, Université Libre de Bruxelles (ULB), Avenue F.D. Roosevelt, 50-CP 165/61, Brussels, 1050, Belgium
| | - Oseweuba Valentine Okoro
- 3BIO-BioMatter, École polytechnique de Bruxelles, Université Libre de Bruxelles (ULB), Avenue F.D. Roosevelt, 50-CP 165/61, Brussels, 1050, Belgium
| | - Houman Alimoradi
- 3BIO-BioMatter, École polytechnique de Bruxelles, Université Libre de Bruxelles (ULB), Avenue F.D. Roosevelt, 50-CP 165/61, Brussels, 1050, Belgium
| | - Lei Nie
- 3BIO-BioMatter, École polytechnique de Bruxelles, Université Libre de Bruxelles (ULB), Avenue F.D. Roosevelt, 50-CP 165/61, Brussels, 1050, Belgium
- College of Life Sciences, Xinyang Normal University, Xinyang, 464000, China
| | - Guohua Jiang
- School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou, 310018, China
| | - Ashok Kakkar
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montréal, Québec, H3A 0B8, Canada
| | - Amin Shavandi
- 3BIO-BioMatter, École polytechnique de Bruxelles, Université Libre de Bruxelles (ULB), Avenue F.D. Roosevelt, 50-CP 165/61, Brussels, 1050, Belgium
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Lu A, Williams RO, Maniruzzaman M. 3D printing of biologics-what has been accomplished to date? Drug Discov Today 2024; 29:103823. [PMID: 37949427 DOI: 10.1016/j.drudis.2023.103823] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Revised: 10/27/2023] [Accepted: 11/06/2023] [Indexed: 11/12/2023]
Abstract
Three-dimensional (3D) printing is a promising approach for the stabilization and delivery of non-living biologics. This versatile tool builds complex structures and customized resolutions, and has significant potential in various industries, especially pharmaceutics and biopharmaceutics. Biologics have become increasingly prevalent in the field of medicine due to their diverse applications and benefits. Stability is the main attribute that must be achieved during the development of biologic formulations. 3D printing could help to stabilize biologics by entrapment, support binding, or crosslinking. Furthermore, gene fragments could be transited into cells during co-printing, when the pores on the membrane are enlarged. This review provides: (i) an introduction to 3D printing technologies and biologics, covering genetic elements, therapeutic proteins, antibodies, and bacteriophages; (ii) an overview of the applications of 3D printing of biologics, including regenerative medicine, gene therapy, and personalized treatments; (iii) information on how 3D printing could help to stabilize and deliver biologics; and (iv) discussion on regulations, challenges, and future directions, including microneedle vaccines, novel 3D printing technologies and artificial-intelligence-facilitated research and product development. Overall, the 3D printing of biologics holds great promise for enhancing human health by providing extended longevity and enhanced quality of life, making it an exciting area in the rapidly evolving field of biomedicine.
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Affiliation(s)
- Anqi Lu
- Division of Molecular Pharmaceutics and Drug Delivery, College of Pharmacy, The University of Texas at Austin, Austin, TX 78712, USA
| | - Robert O Williams
- Division of Molecular Pharmaceutics and Drug Delivery, College of Pharmacy, The University of Texas at Austin, Austin, TX 78712, USA
| | - Mohammed Maniruzzaman
- Division of Molecular Pharmaceutics and Drug Delivery, College of Pharmacy, The University of Texas at Austin, Austin, TX 78712, USA; Pharmaceutical Engineering and 3D Printing (PharmE3D) Lab, Department of Pharmaceutics and Drug Delivery, School of Pharmacy, The University of Mississippi, University, MS 38677, USA.
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Cao X, Lin X, Li N, Zhao X, Zhou M, Zhao Y. Animal tissue-derived biomaterials for promoting wound healing. MATERIALS HORIZONS 2023; 10:3237-3256. [PMID: 37278612 DOI: 10.1039/d3mh00411b] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The skin serves as the primary barrier between the human body and external environment, and is therefore susceptible to damage from various factors. In response to this challenge, animal tissue-derived biomaterials have emerged as promising candidates for wound healing due to their abundant sources, low side-effect profiles, exceptional bioactivity, biocompatibility, and unique extracellular matrix (ECM) mimicry. The evolution of modern engineering technology and therapies has allowed these animal tissue-derived biomaterials to be transformed into various forms and modified to possess the necessary properties for wound repair. This review provides an overview of the wound healing process and the factors that influence it. We then describe the extraction methods, important properties, and recent practical applications of various animal tissue-derived biomaterials. Our focus then shifts to the critical properties of these biomaterials in skin wound healing and their latest research developments. Finally, we critically examine the limitations and future prospects of biomaterials generated from animal tissues in this field.
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Affiliation(s)
- Xinyue Cao
- Department of Vascular Surgery, Nanjing Drum Tower Hospital, School of Biological Science and Medical Engineering, Southeast University, Nanjing, 210096, China.
| | - Xiang Lin
- Department of Vascular Surgery, Nanjing Drum Tower Hospital, School of Biological Science and Medical Engineering, Southeast University, Nanjing, 210096, China.
| | - Ning Li
- Department of Vascular Surgery, Nanjing Drum Tower Hospital, School of Biological Science and Medical Engineering, Southeast University, Nanjing, 210096, China.
| | - Xiaozhi Zhao
- Department of Andrology, Nanjing Drum Tower Hospital, Medical School, Nanjing University, Nanjing 210008, China.
| | - Min Zhou
- Department of Vascular Surgery, Nanjing Drum Tower Hospital, School of Biological Science and Medical Engineering, Southeast University, Nanjing, 210096, China.
| | - Yuanjin Zhao
- Department of Vascular Surgery, Nanjing Drum Tower Hospital, School of Biological Science and Medical Engineering, Southeast University, Nanjing, 210096, China.
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Simińska-Stanny J, Hachemi F, Dodi G, Cojocaru FD, Gardikiotis I, Podstawczyk D, Delporte C, Jiang G, Nie L, Shavandi A. Optimizing phenol-modified hyaluronic acid for designing shape-maintaining biofabricated hydrogel scaffolds in soft tissue engineering. Int J Biol Macromol 2023:125201. [PMID: 37270140 DOI: 10.1016/j.ijbiomac.2023.125201] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Revised: 05/18/2023] [Accepted: 05/31/2023] [Indexed: 06/05/2023]
Abstract
In this study, we developed a well-printable biomaterial ink for 3D printing of shape-maintaining hydrogel scaffolds. The hydrogel base comprised tyramine-modified hyaluronic acid (HA-Tyr) and gelatin methacrylate (GelMA) and was dually cross-linked. Using the Box-Behnken design, we explored how varying the ink composition affected fiber formation and shape preservation. By adjusting the polymer ratios, we produced a stable hydrogel with varying responses, from a viscous liquid to a thick gel, and optimized 3D scaffolds that were structurally stable both during and after printing, offering precision and flexibility. Our ink exhibited shear-thinning behavior and high swelling capacity, as well as ECM-like characteristics and biocompatibility, making it an ideal candidate for soft tissues matrices with storage modulus of around 300 Pa. Animal trials and CAM assays confirmed its biocompatibility and integration with host tissue.
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Affiliation(s)
- Julia Simińska-Stanny
- Université libre de Bruxelles (ULB), École polytechnique de Bruxelles, 3BIO-BioMatter, Avenue F.D. Roosevelt, 50 - CP 165/61, 1050 Brussels, Belgium; Department of Process Engineering and Technology of Polymer and Carbon Materials, Faculty of Chemistry, Wroclaw University of Science and Technology, Norwida 4/6, 50-373 Wroclaw, Poland
| | - Feza Hachemi
- Université libre de Bruxelles (ULB), École polytechnique de Bruxelles, 3BIO-BioMatter, Avenue F.D. Roosevelt, 50 - CP 165/61, 1050 Brussels, Belgium; Université Paris Saclay, Polytech Paris Saclay, Rue Louis de Broglie, 91400 Orsay, France
| | - Gianina Dodi
- Faculty of Medical Bioengineering, Grigore T. Popa, University of Medicine and Pharmacy of Iasi, Romania
| | - Florina D Cojocaru
- Faculty of Medical Bioengineering, Grigore T. Popa, University of Medicine and Pharmacy of Iasi, Romania
| | - Ioannis Gardikiotis
- Advanced Research and Development Center for Experimental Medicine (CEMEX), Grigore T. Popa, University of Medicine and Pharmacy of Iasi, Romania
| | - Daria Podstawczyk
- Department of Process Engineering and Technology of Polymer and Carbon Materials, Faculty of Chemistry, Wroclaw University of Science and Technology, Norwida 4/6, 50-373 Wroclaw, Poland
| | - Christine Delporte
- Université libre de Bruxelles (ULB), Faculté de Médecine, Campus Erasme - CP 611, Laboratory of Pathophysiological and Nutritional Biochemistry, Route de Lennik, 808, 1070 Bruxelles, Belgium
| | - Guohua Jiang
- School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou, China; International Scientific and Technological Cooperation Base of Intelligent Biomaterials and Functional Fibers, Zhejiang Sci-Tech University, Hangzhou, China
| | - Lei Nie
- Université libre de Bruxelles (ULB), École polytechnique de Bruxelles, 3BIO-BioMatter, Avenue F.D. Roosevelt, 50 - CP 165/61, 1050 Brussels, Belgium; College of Life Science, Xinyang Normal University, Xinyang, China
| | - Amin Shavandi
- Université libre de Bruxelles (ULB), École polytechnique de Bruxelles, 3BIO-BioMatter, Avenue F.D. Roosevelt, 50 - CP 165/61, 1050 Brussels, Belgium.
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Lupu A, Gradinaru LM, Gradinaru VR, Bercea M. Diversity of Bioinspired Hydrogels: From Structure to Applications. Gels 2023; 9:gels9050376. [PMID: 37232968 DOI: 10.3390/gels9050376] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Revised: 04/26/2023] [Accepted: 04/28/2023] [Indexed: 05/27/2023] Open
Abstract
Hydrogels are three-dimensional networks with a variety of structures and functions that have a remarkable ability to absorb huge amounts of water or biological fluids. They can incorporate active compounds and release them in a controlled manner. Hydrogels can also be designed to be sensitive to external stimuli: temperature, pH, ionic strength, electrical or magnetic stimuli, specific molecules, etc. Alternative methods for the development of various hydrogels have been outlined in the literature over time. Some hydrogels are toxic and therefore are avoided when obtaining biomaterials, pharmaceuticals, or therapeutic products. Nature is a permanent source of inspiration for new structures and new functionalities of more and more competitive materials. Natural compounds present a series of physico-chemical and biological characteristics suitable for biomaterials, such as biocompatibility, antimicrobial properties, biodegradability, and nontoxicity. Thus, they can generate microenvironments comparable to the intracellular or extracellular matrices in the human body. This paper discusses the main advantages of the presence of biomolecules (polysaccharides, proteins, and polypeptides) in hydrogels. Structural aspects induced by natural compounds and their specific properties are emphasized. The most suitable applications will be highlighted, including drug delivery, self-healing materials for regenerative medicine, cell culture, wound dressings, 3D bioprinting, foods, etc.
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Affiliation(s)
- Alexandra Lupu
- "Petru Poni" Institute of Macromolecular Chemistry, 41-A Grigore Ghica Voda Alley, 700487 Iasi, Romania
| | - Luiza Madalina Gradinaru
- "Petru Poni" Institute of Macromolecular Chemistry, 41-A Grigore Ghica Voda Alley, 700487 Iasi, Romania
| | - Vasile Robert Gradinaru
- Faculty of Chemistry, "Alexandru Ioan Cuza" University, 11 Carol I Bd., 700506 Iasi, Romania
| | - Maria Bercea
- "Petru Poni" Institute of Macromolecular Chemistry, 41-A Grigore Ghica Voda Alley, 700487 Iasi, Romania
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