A chitosan-based fluorescent hydrogel for selective detection of Fe²⁺ ions in gel-to-sol mode and turn-off fluorescence mode

Abstract

A novel chitosan-based fluorescent hydrogel has been synthesized by chemically bonding terpyridine-bearing aldehydes onto chitosan via an acid condensation reaction.

A New Generation of Electrospun Fibers Containing Bioactive Glass Particles for Wound Healing

“…The chemical structure of chitosan that contains hydroxy- and amino groups allows its chemical modification via an acid condensation reaction. For instance, condensation of chitosan with terpyridine-bearing molecules results in a variety of applications including the development of metal sensors [ 12 , 13 ]. Additionally, chitosan showed bactericidal activities attributed to its capacity to bind the sialic acid in phospholipids retaining the movements of microbiological substances [ 14 ].…”

One-step-synthesized d-gluconic acetal-based supramolecular organogelators with effective phase-selective gelation

“…In addition, the critical gel concentration (CGC) values for toluene and oxylene were lower than 0.1 wt%, elevating gelator GAA-2 to the category of supergelator. 15 Moreover, the gelation ability would not change even aer multiple repetitions of the sol-gel cycles, indicating that these gels had complete thermal reversibility. Then all the obtained gels could remain stable at room temperature and no obvious changes were observed when stored at room temperature for 2 months, demonstrating the stability of the gels.…”

“…In addition, the cosolvent could also be used to dissolve PSSGs in advance, and then evenly dispersed into the organic phase to form a gel. [15][16][17][18][19] However, this method always introduces toxic water-soluble solvents (such as tetrahydrofuran, acetonitrile), which may cause secondary pollution and limit the application of PSSGs in practice. Therefore, it is necessary to formulate a more effective strategy to solve the above problems.…”

Facile Synthesis of Water-Soluble Rhodamine-Based Polymeric Chemosensors via Schiff Base Reaction for Fe3+ Detection and Living Cell Imaging

“…Iron ion is one of the most abundant transition metal ions in the human body and plays a vital role in biological metabolism ( Guo et al, 2015 ; Liu et al, 2017 ; Fan et al, 2019 ). The deficiency in iron will lead to the lack of iron-related proteins and cause anemia, cancer, or other health problems ( Park and Lee, 2020 ), while excess iron can inhibit the absorption of nutrients and cause irreversible damage to neurological systems and human organs, leading to serious diseases, such as Alzheimer’s disease, hepatic fibrosis or even death ( Nayab and Shkir, 2017 ; Lin et al, 2020 ).…”