Fish-scale-derived carbon dots as efficient fluorescent nanoprobes for detection of ferric ions

Abstract

Herein, highly fluorescent carbon dots (CDs) with the incorporation of N and O functionalities were prepared through a facile and cost-effective hydrothermal reaction using fish scales of the crucian carp as the precursor. The as-prepared CDs exhibit strong fluorescent emissions at 430 nm with a relative quantum yield of 6.9%, low cytotoxicity, and robust fluorescence stability against photobleaching and good ionic strength. More significantly, the fluorescence of these CDs can be effectively and selectively quenched by Fe 3+ ions, which enables the application of CDs as fluorescent Fe 3+ nanoprobes with a linear range of 1-78 mmol L À1 and a detection limit of 0.54 mmol L À1 . The proposed fluorescent CD nanoprobes can also be used for the assay of spiked Fe 3+ in real water samples and human serums with high recoveries and low standard deviations. Hence, CDs can be potentially applied as safe and reliable fluorescent nanoprobes for environmental and clinical Fe 3+ analyses.

Dansyl-modified carbon dots with dual-emission for pH sensing, Fe3+ ion detection and fluorescent ink

“…54,55 The LOD was much lower than the Fe 3+ ions permissible level in drinking water (5.4 mM) proposed by the Environmental Protection Agency (EPA). 56 It was also comparable to the part previous reported proposed sensor for Fe 3+ ions listed in Table 1. Therefore, the CSCDs@DC for the detection of Fe 3+ ions had the superiority of wide linear ranges, low detection limit, simple operation, excellent selectivity and high sensitivity.…”

Biobased Carbon Dots: From Fish Scales to Photocatalysis

“…Zhang et al [ 10 ], for example, reported a facile synthesis route for the preparation of CDs from grass carp scales for the detection of hypochlorite. Another work shows how fish scale-derived CDs could be used also for the determination of the presence of ferric ions in real water samples and human serum [ 31 ]. Carbon dots produced from fishery waste were synthesized also from Kai et al [ 32 ] and used for the detection of pharmaceuticals molecules as lidocaine hydrochloride.…”

Recent Applications of Biopolymers Derived from Fish Industry Waste in Food Packaging

“…[ 55 , 62 , 63 ]. The recent and increasing interest towards the valorization of fish scales has led to several applications in environmental protection [ 64 ], medicine [ 65 , 66 , 67 ] and bionics [ 68 ].…”