Aliphatic amines - Sensing application in aqueous media using supramolecularly stacked acriflavine dye on graphene...

Supramolecularly stacked acriflavine dye on graphene oxide (GO-Acy) was utilized for the first time to detect aliphatic amines, making it a highly sensitive and selective material. This method involved developing a distinctive, discriminative, and highly selective fluorescent sensor that displayed a 'turn-on' response to aliphatic amines. The sensor probe operated through supramolecular host-guest interactions between the amines and dyes, enabling the detection of aliphatic amines. Upon the interaction of aliphatic amines with bound Acy dye on graphene oxide, the fluorescent sensor exhibited a release of Acy dyes and a rapid appearance of fluorescence. GO-Acy demonstrated high selectivity for 1,4-butanediamine (BD), exhibiting strong fluorescence intensity and accurately distinguishing it from various aliphatic amines, aromatic amines, and amino acids. The fluorescene emission intensities of GO-Acy at λ_em = 510 nm was observed after exposure to different amines, with an excitation wavelength of GO-Acy at λ_ex = 450 nm. In addition to its high selectivity, the sensor probe also exhibited excellent sensitivity towards BD, with a limit of detection (LOD) of 9.9 nM. This graphene-based material proved to be a highly effective tool for detecting aliphatic amines in aqueous media, requiring no special experiments while providing both good selectivity and sensitivity. Additionally, GO-Acy@CB[7] demonstrated diverse responses to aliphatic amines, suggesting its ability to discriminate between them through fluorescence quenching. GO-Acy has proven effective in monitoring fish products that release amine vapors during decomposition. Furthermore, test paper strips made with GO-Acy could quickly detect amines in actual fish samples, highlighting the potential of GO-Acy for food quality inspection.