A novel chemosensor for sensitive and facile detection of strontium ions based on ion-imprinted hydrogels modified with guanosine derivatives

Application of Optical Hydrogels in Environmental Sensing

“…Removal of the imprinted molecules leaves a "blot," conferring MIPCHs with the ability to selectively detect the corresponding objects (Figure 10a). [91,92] These imprinted molecules can be metal ions, [93,94] compounds, [95][96][97][98] and even organisms. [79] Ions cannot usually be direct template molecules for MIPCHs and imprinting them into the hydrogel grid requires the assistance of certain complexes.…”

“…Upon reexposure to Sr 2+ , APG-modified MIPCHs shrink due to the weakened electrostatic repulsion between the four O atoms in the relaxed G-quadruplex (Figure 10b). [93] Similarly, pentaethylenehexamine (PEHA)can coordinate with Pb(II) to form an imprint. MIPCHs formed from secondarily crosslinked Pb(II)-treated pentaethylenehexamine and a PAM hydrogel detected Pb(II) with high sensitivity.…”

Peroxidase activity of a Cu–Fe bimetallic hydrogel and applications for colorimetric detection of ascorbic acid

“…29–32 Compared with organic gels, hydrogels and metallohydrogels contain a large number of water molecules, so the preparation environment is green and the obtained materials are biocompatible, which makes them more widely used. 33,34 The participation of metal centers confers hydrogels with diverse functions, 35–39 such as redox properties, electrical and magnetic properties, and especially catalytic activities. 40 Moreover, the polymetallic center makes the materials possess better performance.…”

White-light-emitting Ln-hydrogels with multi-stimuli responsiveness and applications in environmental sensing and anti-counterfeiting

“…Soft materials with white light emission (WLE) have received considerable attention due to their potential applications for use as imaging agents, emitting diodes, and optical sensors. 1 Among smart soft materials, hydrogels [2][3][4] composed of three-dimensional fibrillar networks with water molecules are particularly eye-catching owing to their many advantages, especially biological compatibility. As an important branch of hydrogels, metallohydrogels were constructed by introducing various metal ions, and the presence of metal ions endowed the gels with many new functions, including electrical properties, redox properties and magnetic properties, especially excellent optical properties.…”