Chemical interactions in composites of gellan gum and bioactive glass: self-crosslinking and in vitro dissolution.

Autor:	Astanina A; Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland., Koivisto JT; Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland.; Division of Pathology, Department of Laboratory Medicine, Karolinska Institutet, Stockholm, Sweden., Hannula M; Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland., Salminen T; Tampere Microscopy Center, Faculty of Engineering and Natural Sciences, Tampere University, Tampere, Finland., Kellomäki M; Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland., Massera J; Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland.
Jazyk:	angličtina
Zdroj:	Frontiers in chemistry [Front Chem] 2023 May 12; Vol. 11, pp. 1133374. Date of Electronic Publication: 2023 May 12 (Print Publication: 2023).
DOI:	10.3389/fchem.2023.1133374
Abstrakt:	We investigated the interactions between the organic-inorganic phases in composites and the impact on in vitro dissolution. The composite consists of a hydrogel-forming polysaccharide gellan gum (GG, organic phase) and a borosilicate bioactive glass (BAG, inorganic phase). The BAG loading in the gellan gum matrix varied from 10 to 50 wt%. While mixing GG and BAG, the ions released from BAG microparticles crosslinked with the carboxylate anions of GG. The nature of the crosslinking was assessed, and its impact on mechanical properties, swelling ratio, and enzymatic degradation profile upon immersion for up to 2 weeks was studied. Loading up to 30 wt% of BAG in GG caused an increase in mechanical properties associated with an increasing crosslinking density. At higher BAG loading, excess divalent ions and percolation of particles led to a decrease in the fracture strength and compressive modulus. Upon immersion, a decrease in the composite mechanical properties was attributed to the dissolution of the BAG and the loosening of the glass/matrix interface. The enzymatic degradation of the composites was inhibited at higher BAG loadings (40 and 50 wt%) even when the specimen was immersed for 48 h in PBS buffer with lysozyme. During in vitro dissolution in both SBF and PBS, the ions released from the glass led to the precipitation of hydroxyapatite already at day 7. In conclusion, we thoroughly discussed the in vitro stability of the GG/BAG composite and established the maximum BAG loading to enhance the GG crosslinking and mechanical properties. Based on this study, 30, 40, and 50 wt% of BAG in GG will be further investigated in an in vitro cell culture study. Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. (Copyright © 2023 Astanina, Koivisto, Hannula, Salminen, Kellomäki and Massera.)
Databáze:	MEDLINE
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