Isatin-Schiff base functionalized graphene oxide as a highly selective turn-on fluorescent probe for the detection of Pd(II) via photoinduced electron transfer pathway.

We investigated the use of isatin-Schiff base functionalized graphene oxide (ISBGO) as a selective fluorescent chemosensor for the detection of palladium ions. Selectivity tests indicated that over 23 metal ions tested, ISBGO (λ = 340 nm, λ = 504 nm) showed the highest affinity for Pd(II), displaying a 10.1-fold enhancement.

Highly selective fluorescent peptide-based chemosensors for aluminium ions in aqueous solution.

Two novel fluorescent peptide-based chemosensors, including A (2-amino-benzoyl-Ser-Glu-Glu-NH) and B (2-amino-benzoyl-Ala-Glu-Pro-Glu-Ala-Glu-Pro-NH) were synthesized and characterized by nuclear magnetic resonance (NMR) spectra. These fluorescent probes exhibited excellent selective and sensitive responses to Al ions over other metal ions in aqueous buffered solutions. The limits of detection for both chemosensors towards the Al ions were in the order of ∼10 M (A: 155 nM and B: 195 nM), which clearly indicates that these probes have significant potential for biological applications.