Cited by 1783D Printing in Biomedical ResearchAdditive Manufacturing and 3D Printing TechnologiesHydrogels: synthesis, properties, applications

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State-of-the-art of 3D printing technology of alginate-based hydrogels—An emerging technique for industrial applications

Mallakpour, Shadpour, Azadi, Elham, Hussain, Chaudhery Mustansar·2021·Advances in Colloid and Interface Science

Abstract

Recently, three-dimensional (3D) printing (also known as additive manufacturing) has received unprecedented consideration in various fields owing to many advantages compared to conventional manufacturing equipment such as reduced fabrication time, one-step production, and the ability for rapid prototyping. This promising technology, as the next manufacturing revolution and universal industrial method, allows the user to fabricate desired 3D objects using a layer-by-layer deposition of material and a 3D printer. Alginate, a versatile polysaccharide derived from seaweed, is popularly used for this advanced bio-fabrication technique due to its printability, biodegradability, biocompatibility, excellent availability, low degree of toxicity, being a relatively inexpensive, rapid gelation in the presence of Ca 2+ divalent, and having fascinating chemical structure. In recent years, 3D printed alginate-based hydrogels have been prepared and used in various fields including tissue engineering, water treatment, food, electronics, and so forth. Due to the prominent role of 3D printed alginate-based materials in diverse fields. So, this review will focus and highlight the latest and most up-to-date achievements in the field of 3D printed alginate-based materials in biomedical, food, water treatment, and electronics.

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Research works printed but not linked: 99

  1. Browne, 2020, 3D printing for electrochemical energy applications, Chem Rev, 120, 2783, 10.1021/acs.chemrev.9b00783 · DOI
  2. Le Duigou, 2020, A review of 3D and 4D printing of natural fibre biocomposites, Mater Des, 194, 108911, 10.1016/j.matdes.2020.108911 · DOI
  3. Nadagouda, 2020, A review on 3D printing techniques for medical applications, Curr Opin Chem Eng, 28, 152, 10.1016/j.coche.2020.05.007 · DOI
  4. Wang, 2020, 3D printing of bone tissue engineering scaffolds, Bioact Mater, 5, 82
  5. Li, 2020, 3D printing of hydrogels: rational design strategies and emerging biomedical applications, Mater Sci Eng R Reports, 140, 100543, 10.1016/j.mser.2020.100543 · DOI
  6. Elder, 2020, Nanomaterial patterning in 3D printing, Adv Mater, 32, 1907142, 10.1002/adma.201907142 · DOI
  7. Egorov, 2020, Evolution of 3D printing methods and materials for electrochemical energy storage, Adv Mater, 32, 2000556, 10.1002/adma.202000556 · DOI
  8. Han, 2020, Recent advances on high-entropy alloys for 3D printing, Adv Mater, 32, 1903855, 10.1002/adma.201903855 · DOI
  9. Prendergast, 2020, Recent advances in enabling technologies in 3D printing for precision medicine, Adv Mater, 32, 1, 10.1002/adma.201902516 · DOI
  10. Yuk, 2020, 3D printing of conducting polymers, Nat Commun, 11, 4, 10.1038/s41467-020-15316-7 · DOI
  11. Wajahat, 2020, 3D printing of Fe3O4 functionalized graphene-polymer (FGP) composite microarchitectures, Carbon N Y, 167, 278, 10.1016/j.carbon.2020.05.045 · DOI
  12. Vordos, 2020, How 3D printing and social media tackles the PPE shortage during Covid – 19 pandemic, Saf Sci, 130, 104870, 10.1016/j.ssci.2020.104870 · DOI
  13. Melocchi, 2020, 3D printing by fused deposition modeling of single- and multi-compartment hollow systems for oral delivery – a review, Int J Pharm, 579, 119155, 10.1016/j.ijpharm.2020.119155 · DOI
  14. Mallakpour, 2021, Recent advancements in 3D bioprinting technology of carboxymethyl cellulose-based hydrogels: utilization in tissue engineering, Adv Colloid Interface Sci, 292, 102415, 10.1016/j.cis.2021.102415 · DOI
  15. Tran, 2018, Graphene inks for printed flexible electronics: Graphene dispersions, ink formulations, printing techniques and applications, Adv Colloid Interface Sci, 261, 41, 10.1016/j.cis.2018.09.003 · DOI
  16. Dorishetty, 2020, Bioprintable tough hydrogels for tissue engineering applications, Adv Colloid Interface Sci, 281, 102163, 10.1016/j.cis.2020.102163 · DOI
  17. Haleem, 2020, 3D printing applications in bone tissue engineering, J Clin Orthop Trauma, 11, 118, 10.1016/j.jcot.2019.12.002 · DOI
  18. Tijing, 2020, 3D printing for membrane separation, desalination and water treatment, Appl Mater Today, 18, 100486, 10.1016/j.apmt.2019.100486 · DOI
  19. Choong, 1802, The global rise of 3D printing during the COVID-19 pandemic, Nat Rev Mater, 2020, 1
  20. Ishack, 2020, Applications of 3D printing technology to address COVID-19−related supply shortages, Am J Med, 133, 771, 10.1016/j.amjmed.2020.04.002 · DOI
  21. Ambrosi, 2020, 3D printing for aqueous and non-aqueous redox flow batteries, Curr Opin Electrochem, 20, 28, 10.1016/j.coelec.2020.02.005 · DOI
  22. Distler, 2020, 3D printing of electrically conductive hydrogels for tissue engineering and biosensors – a review, Acta Biomater, 101, 1, 10.1016/j.actbio.2019.08.044 · DOI
  23. Bandyopadhyay, 2020, 3D printing for bone regeneration, Curr Osteoporos Rep, 1
  24. Keerthana, 2020, Development of fiber-enriched 3D printed snacks from alternative foods: a study on button mushroom, J Food Eng, 287, 110116, 10.1016/j.jfoodeng.2020.110116 · DOI
  25. Xu, 2020, Impact of thermal treatment on the rheological, microstructural, protein structures and extrusion 3D printing characteristics of egg yolk, Food Hydrocoll, 100, 105399, 10.1016/j.foodhyd.2019.105399 · DOI
  26. Baiano, 2020, 3D printed foods: a comprehensive review on technologies, nutritional value, safety, consumer attitude, regulatory framework, and economic and sustainability issues, Taylor & Francis
  27. Theodosiou, 2020, Developing 3D-printable cathode electrode for monolithically printed microbial fuel cells (MFCs), Molecules, 25, 10.3390/molecules25163635 · DOI
  28. Liu, 2021, Binder-free 3D printing of covalent organic framework (COF) monoliths for CO2 adsorption, Chem Eng J, 403, 126333, 10.1016/j.cej.2020.126333 · DOI
  29. Abasalizadeh, 2020, Alginate-based hydrogels as drug delivery vehicles in cancer treatment and their applications in wound dressing and 3D bioprinting, J Biol Eng, 14, 1
  30. Fernando, 2020, Alginate-based nanomaterials: fabrication techniques, properties, and applications, Chem Eng J, 391, 123823, 10.1016/j.cej.2019.123823 · DOI · Paper page
  31. Varaprasad, 2020, Alginate-based composite materials for wound dressing application:a mini review, Carbohydr Polym, 236, 116025, 10.1016/j.carbpol.2020.116025 · DOI
  32. Priyadarshi, 2021, Effect of sulfur nanoparticles on properties of alginate-based films for active food packaging applications, Food Hydrocoll, 110, 106155, 10.1016/j.foodhyd.2020.106155 · DOI
  33. Guedes Silva, 2021, Protection and targeted delivery of β-carotene by starch-alginate-gelatin emulsion-filled hydrogels, J Food Eng, 290, 110205, 10.1016/j.jfoodeng.2020.110205 · DOI
  34. Pereira, 2021, Application of zero valent iron (ZVI) immobilized in Ca-Alginate beads for C.I. Reactive Red 195 catalytic degradation in an air lift reactor operated with ozone, J Hazard Mater, 401, 123275, 10.1016/j.jhazmat.2020.123275 · DOI
  35. Mallakpour, 2020, Environmentally benign production of cupric oxide nanoparticles and various utilizations of their polymeric hybrids in different technologies, Coord. Chem Rev, 213378, 10.1016/j.ccr.2020.213378 · DOI
  36. Mallakpour, 2019, Synthesis of alginate/carbon nanotube/carbon dot/fluoroapatite/TiO2 beads for dye photocatalytic degradation under ultraviolet light, Carbohydr Polym, 224, 115138, 10.1016/j.carbpol.2019.115138 · DOI
  37. Mallakpour, 2020, Physicochemical inspection and in vitro bioactivity behavior of bio-nanocomposite alginate hydrogels filled by magnesium fluoro-hydroxyapatite, Polym Bull
  38. Palit, 2018, Nanocomposites in packaging: a groundbreaking review and a vision for the future, Bio-Based Mater Food Packag Green Sustain Adv Packag Mater, 287, 10.1007/978-981-13-1909-9_13 · DOI
  39. Palit, 2018, Biopolymers, nanocomposites, and environmental protection: a far-reaching review, Bio-based Mater Food Packag, 217, 10.1007/978-981-13-1909-9_10 · DOI
  40. Mallakpour, 2021, Protection, disinfection, and immunization for healthcare during the COVID-19 pandemic: role of natural and synthetic macromolecules, Sci Total Environ, 776, 145989, 10.1016/j.scitotenv.2021.145989 · DOI
  41. Duin, 2019, 3D bioprinting of functional islets of langerhans in an alginate/methylcellulose hydrogel blend, Adv Healthc Mater, 8, 1
  42. Jeon, 2019, Cryopreserved cell-laden alginate microgel bioink for 3D bioprinting of living tissues, Mater Today Chem, 12, 61, 10.1016/j.mtchem.2018.11.009 · DOI
  43. Zhou, 2019, Interfacial diffusion printing: an efficient manufacturing technique for artificial tubular grafts, ACS Biomater Sci Eng, 5, 6311, 10.1021/acsbiomaterials.9b01293 · DOI
  44. Kalkandelen, 2019, 3D printing of gelatine/alginate/β-Tricalcium phosphate composite constructs for bone tissue engineering, ChemistrySelect, 4, 12032, 10.1002/slct.201902878 · DOI
  45. Espona-Noguera, 2019, 3D printed polyamide macroencapsulation devices combined with alginate hydrogels for insulin-producing cell-based therapies, Int J Pharm, 566, 604, 10.1016/j.ijpharm.2019.06.009 · DOI
  46. Lin, 2019, 3D printing of mechanically stable calcium-free alginate-based scaffolds with tunable surface charge to enable cell adhesion and facile biofunctionalization, Adv Funct Mater, 29, 1
  47. Liu, 2019, Bioactive and biocompatible macroporous scaffolds with tunable performances prepared based on 3D printing of the pre-crosslinked sodium alginate/hydroxyapatite hydrogel ink, Macromol Mater Eng, 304, 1, 10.1002/mame.201800698 · DOI
  48. Seyedmahmoud, 2019, Three-dimensional bioprinting of functional skeletal muscle tissue using gelatin methacryloyl-alginate bioinks, Micromachines, 10, 1, 10.3390/mi10100679 · DOI
  49. Naghieh, 2019, Indirect 3D bioprinting and characterization of alginate scaffolds for potential nerve tissue engineering applications, J Mech Behav Biomed Mater, 93, 183, 10.1016/j.jmbbm.2019.02.014 · DOI
  50. Urruela-Barrios, 2019, Alginate/gelatin hydrogels reinforced with TiO2 and β-TCP fabricated by microextrusion-based printing for tissue regeneration, Polymers (Basel), 11, 10.3390/polym11030457 · DOI
  51. Soltan, 2019, Printability and cell viability in bioprinting alginate Dialdehyde-gelatin scaffolds, ACS Biomater Sci Eng, 5, 2976, 10.1021/acsbiomaterials.9b00167 · DOI
  52. Van Belleghem, 2020, Hybrid 3D printing of synthetic and cell-laden bioinks for shape retaining soft tissue grafts, Adv Funct Mater, 30, 1, 10.1002/adfm.201907145 · DOI
  53. Liu, 2018, Preparation and properties of 3D printed alginate-chitosan polyion complex hydrogels for tissue engineering, Polymers, 10, 664, 10.3390/polym10060664 · DOI
  54. Bendtsen, 2017, Development of a novel alginate-polyvinyl alcohol-hydroxyapatite hydrogel for 3D bioprinting bone tissue engineered scaffolds, J Biomed Mater Res-Part A, 105, 1457, 10.1002/jbm.a.36036 · DOI
  55. Nguyen, 2017, Cartilage tissue engineering by the 3D bioprinting of iPS cells in a Nanocellulose/alginate bioink, Sci Rep, 7, 1
  56. Yang, 2018, Collagen-alginate as bioink for three-dimensional (3D) cell printing based cartilage tissue engineering, Mater Sci Eng C, 83, 195, 10.1016/j.msec.2017.09.002 · DOI
  57. Li, 2017, 3D bioprinting of highly thixotropic alginate/methylcellulose hydrogel with strong Interface bonding, ACS Appl Mater Interfaces, 9, 20086, 10.1021/acsami.7b04216 · DOI
  58. Pei, 2020, 3D-printed metal-organic frameworks within biocompatible polymers as excellent adsorbents for organic dyes removal, J Hazard Mater, 384, 121418, 10.1016/j.jhazmat.2019.121418 · DOI
  59. Shahbazi, 2020, Electron beam crosslinking of alginate/nanoclay ink to improve functional properties of 3D printed hydrogel for removing heavy metal ions, Carbohydr Polym, 240, 116211, 10.1016/j.carbpol.2020.116211 · DOI
  60. Liu, 2020, Immobilization of laccase by 3D bioprinting and its application in the biodegradation of phenolic compounds, Int J Biol Macromol, 164, 518, 10.1016/j.ijbiomac.2020.07.144 · DOI
  61. Liakos, 2020, 3D printed composites from heat extruded polycaprolactone/sodium alginate filaments and their heavy metal adsorption properties, Mater Chem Front, 4, 2472, 10.1039/D0QM00159G · DOI
  62. Vieira, 2020, 3D printed functional cookies fortified with Arthrospira platensis: evaluation of its antioxidant potential and physical-chemical characterization, Food Hydrocoll, 107, 10.1016/j.foodhyd.2020.105893 · DOI
  63. Park, 2020, Callus-based 3D printing for food exemplified with carrot tissues and its potential for innovative food production, J Food Eng, 271, 109781, 10.1016/j.jfoodeng.2019.109781 · DOI
  64. Liu, 2020, Effects of sodium alginate and rice variety on the physicochemical characteristics and 3D printing feasibility of rice paste, LWT-Food Sci Technol, 127, 109360, 10.1016/j.lwt.2020.109360 · DOI
  65. Oyinloye, 2020, Stability of 3D printing using a mixture of pea protein and alginate: precision and application of additive layer manufacturing simulation approach for stress distribution, J Food Eng, 288, 110127, 10.1016/j.jfoodeng.2020.110127 · DOI
  66. Ahmed, 2020, Zinc oxide/clove essential oil incorporated type B gelatin nanocomposite formulations: a proof-of-concept study for 3D printing applications, Food Hydrocoll, 98, 105256, 10.1016/j.foodhyd.2019.105256 · DOI
  67. Kuo, 2020, An integrated manufacturing strategy to fabricate delivery system using gelatin/ alginate hybrid hydrogels: 3D printing and freeze-drying, Food Hydrocoll, 111, 106262, 10.1016/j.foodhyd.2020.106262 · DOI
  68. Ahlfeld, 2020, A novel plasma-based bioink stimulates cell proliferation and differentiation in bioprinted, mineralized constructs, ACS Appl Mater Interfaces, 12, 12557, 10.1021/acsami.0c00710 · DOI
  69. Olate-Moya, 2020, Chondroinductive alginate-based hydrogels having graphene oxide for 3D printed scaffold fabrication, ACS Appl Mater Interfaces, 12, 4343, 10.1021/acsami.9b22062 · DOI
  70. Ren, 2020, Skin-inspired multifunctional luminescent hydrogel containing layered rare-earth hydroxide with 3D printability for human motion sensing, ACS Appl Mater Interfaces, 12, 6797, 10.1021/acsami.9b17371 · DOI
  71. Michel, 2020, Hydrogel-colloid composite bioinks for targeted tissue-printing, Biomacromolecules, 21, 2949, 10.1021/acs.biomac.0c00305 · DOI
  72. Zhang, 2020, Three-dimensional printed cell culture model based on spherical colloidal lignin particles and cellulose nanofibril-alginate hydrogel, Biomacromolecules, 21, 1875, 10.1021/acs.biomac.9b01745 · DOI
  73. Guo, 2020, Mussel-inspired naturally derived double-network hydrogels and their application in 3D printing: from soft, injectable bioadhesives to mechanically strong hydrogels, ACS Biomater Sci Eng, 6, 1798, 10.1021/acsbiomaterials.9b01864 · DOI
  74. Feng, 2020, Three-dimensional printing of hydrogel scaffolds with hierarchical structure for scalable stem cell culture, ACS Biomater Sci Eng, 6, 2995, 10.1021/acsbiomaterials.9b01825 · DOI
  75. Mirani, 2020, Facile method for fabrication of meter-long multifunctional hydrogel fibers with controllable biophysical and biochemical features, ACS Appl Mater Interfaces, 12, 9080, 10.1021/acsami.9b23063 · DOI
  76. Jang, 2020, ASC/chondrocyte-laden alginate hydrogel/PCL hybrid scaffold fabricated using 3D printing for auricle regeneration, Carbohydr Polym, 248, 116776, 10.1016/j.carbpol.2020.116776 · DOI
  77. Sun, 2020, 3D printing of calcium phosphate scaffolds with controlled release of antibacterial functions for jaw bone repair, Mater Des, 189, 108540, 10.1016/j.matdes.2020.108540 · DOI
  78. Wu, 2020, In vitro and in vivo biocompatibility evaluation of a 3D bioprinted gelatin-sodium alginate/rat Schwann-cell scaffold, Mater Sci Eng C, 109, 110530, 10.1016/j.msec.2019.110530 · DOI
  79. Wei, 2020, 3D printed core-shell hydrogel fiber scaffolds with NIR-triggered drug release for localized therapy of breast cancer, Int J Pharm, 580, 119219, 10.1016/j.ijpharm.2020.119219 · DOI
  80. Antich, 2020, Bio-inspired hydrogel composed of hyaluronic acid and alginate as a potential bioink for 3D bioprinting of articular cartilage engineering constructs, Acta Biomater, 106, 114, 10.1016/j.actbio.2020.01.046 · DOI
  81. Karavasili, 2020, Physico-mechanical and finite element analysis evaluation of 3D printable alginate-methylcellulose inks for wound healing applications, Carbohydr Polym, 247, 116666, 10.1016/j.carbpol.2020.116666 · DOI
  82. Ilhan, 2020, Development of Satureja cuneifolia-loaded sodium alginate/polyethylene glycol scaffolds produced by 3D-printing technology as a diabetic wound dressing material, Int J Biol Macromol, 161, 1040, 10.1016/j.ijbiomac.2020.06.086 · DOI
  83. Säljö, 2020, Successful engraftment, vascularization, and in vivo survival of 3D-bioprinted human lipoaspirate-derived adipose tissue, Bioprinting, 17, 10.1016/j.bprint.2019.e00065 · DOI
  84. Chen, 2020, 3D freeform printing of nanocomposite hydrogels through in situ precipitation in reactive viscous fluid shengyang, Int J Bioprint, 6, 258, 10.18063/ijb.v6i2.258 · DOI
  85. Liu, 2020, 3D-bioprinted functional and biomimetic hydrogel scaffolds incorporated with nanosilicates to promote bone healing in rat calvarial defect model, Mater Sci Eng C, 112, 110905, 10.1016/j.msec.2020.110905 · DOI
  86. MacCallum, 2020, Development of a 3D bioprinting system using a co-flow of calcium chloride mist, Bioprinting, 00085
  87. Heo, 2020, Bioprinting of carbohydrazide-modified gelatin into microparticle-suspended oxidized alginate for the fabrication of complex-shaped tissue constructs, ACS Appl Mater Interfaces, 12, 20295, 10.1021/acsami.0c05096 · DOI
  88. Li, 2021, Submerged and non-submerged 3D bioprinting approaches for the fabrication of complex structures with the hydrogel pair GelMA and alginate/methylcellulose, Addit Manuf, 37, 101640
  89. Zhu, 2020, 3D printing of an integrated triphasic MBG-alginate scaffold with enhanced interface bonding for hard tissue applications, J Mater Sci Mater Med, 31, 10.1007/s10856-020-06459-6 · DOI
  90. Deb, 2021, International journal of biological macromolecules 3D-printed bioactive and biodegradable hydrogel scaffolds of alginate / gelatin / cellulose nanocrystals for tissue engineering, Int J Biol Macromol, 167, 644, 10.1016/j.ijbiomac.2020.12.011 · DOI
  91. Wang, 2021, 3D printed agar / calcium alginate hydrogels with high shape fidelity and tailorable mechanical properties, Polymer, 214, 123238, 10.1016/j.polymer.2020.123238 · DOI
  92. Sangkert, 2021, 3D printed scaffolds of alginate/polyvinylalcohol with silk fibroin based on mimicked extracellular matrix for bone tissue engineering in maxillofacial surgery, Mater Today Commun, 26, 102140, 10.1016/j.mtcomm.2021.102140 · DOI
  93. Freyman, 2020, 3D printing of living bacteria electrode, Nano Res, 13, 1318, 10.1007/s12274-019-2534-1 · DOI
  94. Podstawczyk, 2020, 3D printed stimuli-responsive magnetic nanoparticle embedded alginate-methylcellulose hydrogel actuators, Addit Manuf, 34, 101275
  95. Liu, 2020, 3D printing of an in situ grown MOF hydrogel with tunable mechanical properties, ACS Appl Mater Interfaces, 12, 33267, 10.1021/acsami.0c08880 · DOI
  96. Huang, 2020, Continuous liquid interface production of alginate / polyacrylamide hydrogels with supramolecular shape memory properties, Carbohydr Polym, 231, 115736, 10.1016/j.carbpol.2019.115736 · DOI
  97. Pahlevanzadeh, 2020, Recent trends in three-dimensional bioinks based on alginate for biomedical applications, Materials, 13, 3980, 10.3390/ma13183980 · DOI
  98. Lai, 2021, 4D printing of highly printable and shape morphing hydrogels consisted of alginate and methylcellulose, Mater Des, 205, 109699, 10.1016/j.matdes.2021.109699 · DOI
  99. Luo, 2019, Cell-laden 4D bioprinting using NIR-triggered shape morphing alginate/polydopamine bioinks, Biofabrication, 11, 10.1088/1758-5090/ab39c5 · DOI

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Metadata

Authors
Mallakpour, S., Azadi, E., & Hussain, C. M.
Affiliations
  • Isfahan University of Technology (IR)
  • New Jersey Institute of Technology (US)
Corresponding author
Mallakpour, Shadpour
Venue
Advances in Colloid and Interface Science
Publisher
Elsevier BV
Published
2021-07
Volume
293
Pages
102436
ISSN
0001-8686 (ISSN-L)
OpenAlex
W3160403233
Cited by
178
References
0
Citations by year
2026: 20 · 2025: 37 · 2024: 44 · 2023: 42 · 2022: 27 · 2021: 8
FWCI
2.56
Type
journal article
Language
en
Open access
closed
Locations
  • Advances in Colloid and Interface Science (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Foundation of Elites
  • Iran Nanotechnology Initiative Council
  • Isfahan University of Technology
Topics
  • Physical Sciences › Engineering › Biomedical Engineering › 3D Printing in Biomedical Research
  • Physical Sciences › Engineering › Industrial and Manufacturing Engineering › Additive Manufacturing and 3D Printing Technologies
  • Physical Sciences › Materials Science › Biomaterials › Hydrogels: synthesis, properties, applications
Keywords
3D printing, alginate, hydrogels, additive manufacturing, tissue engineering, water treatment, food applications, electronic applications, biomedical applications, calcium-induced gelation, polysaccharides

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