Highly sensitive fluorescence probe based on chitosan nanoparticle for selective detection of Hg2+ in water

Synthesis and characterization of novel nano-chitosan Schiff base and use of lead (II) sensor

“…The characteristic absorption peaks of N H, −CH 3 and the second hydroxyl absorption peak ( OH) appear at 1635, 1458 and 1377 cm −1 respectively [22]. The absorption bands at 1070 cm −1 (asymmetric stretching of the C O C bridge) was characteristic absorption bands of the polysaccharide structure of CN [2,23]. The FT-IR spectra of the CHNS show a strong absorption at 1627 cm −1 which is assigned to the azomethine group vibration (C N) [22,24] and the characteristic absorption peaks of the phenyl and phenolic groups show at about 1456, 755, and 1272 cm −1 [22].…”

“…Chitosan is hydrophilic and appears to be more useful than chitin because it has both hydroxyl and amino groups, which provide the sites for numerous attractive chemical modifications, such as protein, DNA, enzyme, antibody, as well as fluorescent molecules [2,3]. Chitosan is nontoxic and soft compatible in the range of toxicity tests.…”

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

“…And it was found that there was a new peak at 1640 cm À1 which was ascribed to the amide bond. 51 It indicated the sulfonyl group in the dansyl uorophore converted into sulfonamide. These results revealed that the dansyl uorophores had connected to the amino groups on the surface of CSCDs.…”

Turn-on fluorometric β-carotene assay based on competitive host-guest interaction between rhodamine 6G and β-carotene with a graphene oxide functionalized with a β-cyclodextrin-modified polyethyleneimine

“…The peak at 2924 cm −1 was assigned to asymmetric -CH 2 stretching vibrations [27]. The peak at 1647 cm −1 was attributed to C = O stretching vibrations [28], and the peaks at 1157 and 1028 cm −1 were ascribed to C-O-C groups and C-OH groups, respectively [29]. The FTIR spectrum of β-CD-PEI, shown in Fig.…”