Alendronate-functionalized poly(2-oxazoline)s with tunable affinity for calcium cations

María J. Sánchez-Fernández, Mikey R. Immers, Rosa P. Félix Lanao, Fang Yang, Johan C.M.E. Bender, Jasmin Mecinović, Sander C.G. Leeuwenburgh (Corresponding author), Jan C.M. van Hest (Corresponding author)

Research output: Contribution to journalArticleAcademicpeer-review

3 Citations (Scopus)
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Abstract

A library of poly(2-oxazoline)s functionalized with controllable amounts of alendronate, hydroxyl, and carboxylic acid side groups was successfully synthesized to create novel polymers with tunable affinity for calcium cations. The affinity of alendronate-containing polymers for calcium cations was quantified using isothermal titration calorimetry. Thermodynamic measurements revealed that the Ca2+-binding affinity of these polymers increased linearly with the amount of alendronate functionalization, up to values (KCa 2+ = 2.4 × 105 M-1) that were about 120-fold higher than those for previously reported polymers. The calcium-binding capacity of alendronate-functionalized poly(2-oxazoline)s was exploited to form robust hydrogel networks cross-linked using reversible physical bonds. Oscillatory rheology showed that these hydrogels recovered more than 100% of their initial storage modulus after severe network destruction. The versatile synthesis of alendronate-functionalized polymers and their strong and tunable affinity for calcium cations render these polymers promising candidates for various biomedical applications.

Original languageEnglish
Pages (from-to)2913-2921
Number of pages9
JournalBiomacromolecules
Volume20
Issue number8
DOIs
Publication statusPublished - 12 Aug 2019

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