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Identification of molecular fluorophore as a component of carbon dots able to induce gelation in a fluorescent multivalent-metal-ion-free alginate hydrogel
Authors
Ammar Bin Yousaf
Martin Danko
+8 more
Peter Kasak
Igor Krupa
Wing-Fu Lai
Miroslav Mrlík
Andrey L. Rogach
Ján Tkáč
Yuan Xiong
Sifani Zavahir
Publication date
20 November 2019
Publisher
Nature Publishing Group
Abstract
We introduce a simple approach to fabricate fluorescent multivalent metal ion-free alginate hydrogels, which can be produced using carbon dots accessible from natural sources (citric acid and L-cysteine). Molecular fluorophore 5-oxo-2,3-dihydro-5H-[1,3]-thiazolo[3,2-a] pyridine-3,7-dicarboxylic acid (TPDCA), which is formed during the synthesis of carbon dots, is identified as a key segment for the crosslinking of hydrogels. The crosslinking happens through dynamic complexation of carboxylic acid groups of TPDCA and alginate cages along with sodium ions. The TPDCA derived hydrogels are investigated regarding to their thermal, rheological and optical properties, and found to exhibit characteristic fluorescence of this aggregated molecular fluorophore. Moreover, gradient hydrogels with tunable mechanical and optical properties and controlled release are obtained upon immersion of the hydrogel reactors in solutions of divalent metal ions (Ca2+, Cu2+, and Ni2+) with a higher affinity to alginate. © 2019, The Author(s).Qatar National Research Fund (Qatar foundation) [8-878-1-172]; Qatar University grant [QUCG-CAM-19/20-2]; Germany/Hong Kong Joint Research Scheme - Research Grants Council of Hong Kong; Germany Academic Exchange Service of Germany [G-CityU103/16]; VEGA Scientific Grant AgencyVedecka grantova agentura MSVVaS SR a SAV (VEGA) [2/0158/17
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Last time updated on 28/11/2019