Strontium ion substituted alginate‐based hydrogel fibers and its coordination binding model

• Published in: Journal of applied polymer science Vol. 137; no. 16
• Main Authors: Zhang, Xiaolin, Wang, Lanlan, Weng, Lin, Deng, Bingyao
• Format: Journal Article
• Language: English
• Published: Hoboken, USA John Wiley & Sons, Inc 20.04.2020; Wiley Subscription Services, Inc
• Subjects: Alginates; Binding; Calcium ions; Chelation; coordination model; Coordination models; Crosslinking; Dichroism; Electrical resistivity; Fibers; hydrogel fiber; Hydrogels; Materials science; Mechanical properties; microfluidic spinning; Microfluidics; Molecular chains; Polymers; Sr‐alginate; Strontium; Technology assessment
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/app.48571

ABSTRACT Sr‐alginate and Ca‐alginate hydrogel fibers were fabricated via microfluidic spinning technology, and various analytical methods were adopted to characterize fibers and disclose the coordination model of Sr2+ binding with alginate molecule chain. For both fibers, the more crosslinking sites of Sr2+ with alginate molecule were illustrated in comparison with that of Ca2+. The more robust mechanical performance of Sr‐alginate fibers than Ca‐alginate counterpart was a strong indication of the more strong binding of Sr2+ with alginate molecular chain. FTIR and electric conductivity disclosed the chelation type of Sr2+ with alginate macromolecule being similar to that of Ca2+, which was core‐shell of the analogous “egg‐box” structure. Circular dichroism spectroscopy further certified the extra coordination sites for Sr2+ with alginate molecule than Ca2+. Research on the coordination model will be more beneficial to optimizing the physicochemical properties of alginate fibers. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48571.