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Open AccessFeature PaperArticle

Spin-Coated Polysaccharide-Based Multilayered Freestanding Films with Adhesive and Bioactive Moieties

3Bs Research Group, I3Bs—Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Avepark, Barco, 4805–017 Guimarães, Portugal
ICVS/3B’s, Associate PT Government Laboratory, 4710-057 Braga/4805–017 Guimarães, Portugal
The Discoveries Centre for Regenerative and Precision Medicine, Headquarters at University of Minho, Avepark, Barco, 4805–017 Guimarães, Portugal
Department of Chemistry, University of Minho, Campus de Gualtar, 4710–057 Braga, Portugal
Authors to whom correspondence should be addressed.
Academic Editor: Iva Pashkuleva
Molecules 2020, 25(4), 840;
Received: 16 December 2019 / Revised: 6 February 2020 / Accepted: 12 February 2020 / Published: 14 February 2020
(This article belongs to the Special Issue Glycans in Design and Synthesis of Biofunctional Materials)
Freestanding films based on catechol functionalized chitosan (CHI), hyaluronic acid (HA), and bioglass nanoparticles (BGNPs) were developed by spin-coating layer-by-layer assembly (SA-LbL). The catechol groups of 3,4-dihydroxy-l-phenylalanine (DOPA) present in the marine mussels adhesive proteins (MAPs) are the main factors responsible for their characteristic strong wet adhesion. Then, the produced films were cross-linked with genipin to improve their stability in wet state. Overall, the incorporation of BGNPs resulted in thicker and bioactive films, hydrophilic and rougher surfaces, reduced swelling, higher weight loss, and lower stiffness. The incorporation of catechol groups onto the films showed a significant increase in the films’ adhesion and stiffness, lower swelling, and weight loss. Interestingly, a synergetic effect on the stiffness increase was observed upon the combined incorporation of BGNPs with catechol-modified polymers, given that such films were the stiffest. Regarding the biological assays, the films exhibited no negative effects on cellular viability, adhesion, and proliferation, and the BGNPs seemed to promote higher cellular metabolic activity. These bioactive LbL freestanding films combine enhanced adhesion with improved mechanical properties and could find applications in the biomedical field, such as guided hard tissue regeneration membranes. View Full-Text
Keywords: layer-by-layer; spin-coating; freestanding films; catechol-modified polymers; nacre-inspired; nanocomposite layer-by-layer; spin-coating; freestanding films; catechol-modified polymers; nacre-inspired; nanocomposite
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Moreira, J.; Vale, A.C.; A. Pires, R.; Botelho, G.; Reis, R.L.; Alves, N.M. Spin-Coated Polysaccharide-Based Multilayered Freestanding Films with Adhesive and Bioactive Moieties. Molecules 2020, 25, 840.

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