So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic.Cerra, Sara; Salamone, Tommaso A.; Sciubba, Fabio; Marsotto, Martina; Battocchio, Chiara; Nappini, Silvia; Scaramuzzo, Francesca A.; Li Voti, Roberto; Sibilia, Concita; Matassa, Roberto; Beltran, Ana Maria; Familiari, Giuseppe; Fratoddi, Ilaria researched the compound: Hydrogen tetrachloroaurate(III) trihydrate( cas:16961-25-4 ).COA of Formula: AuCl4H7O3.They published the article 《Study of the interaction mechanism between hydrophilic thiol capped gold nanoparticles and melamine in aqueous medium》 about this compound( cas:16961-25-4 ) in Colloids and Surfaces, B: Biointerfaces. Keywords: hydrophilic thiol gold nanoparticle melamine UV spectroscopy; 3-mercapto-1-propanesulfonate; Aggregation mechanism; Electrostatic interactions; Hydrophilic gold nanoparticles; Melamine. We’ll tell you more about this compound (cas:16961-25-4).
In the last years, intense efforts have been made in order to obtain colloidal-based systems capable of pointing out the presence of melamine in food samples. In this work, we reported about the recognition of melamine in aqueous solution, using gold nanoparticles stabilized with 3-mercapto-1-propanesulfonate (AuNPs-3MPS), with the aim of deepening how the recognition process works. AuNPs were synthesized using a wet chem. reduction method. The synthesized AuNPs-3MPS probe was fully characterized, before and after the recognition process, by both physicochem. (UV-vis, FT-IR, 1H-NMR, DLS and ζ-potential) and morphostructural techniques (AFM, HR-TEM). The chem. and electronic structure was also investigated by SR-XPS. The sensing method is based on the melamine-induced aggregation of AuNPs; the presence of melamine was successfully detected in the range of 2.5-500 ppm. The results achieved also demonstrate that neg. charged AuNPs-3MPS are potentially useful for determining melamine contents in aqueous solution SR-XPS measurements allowed to understand interaction mechanism between the probe and the analyte. The presence of sulfonate groups allows a mutual interaction mediated by electrostatic bonds between nanoparticles surface thiols and pos. charged amino groups of melamine mols.
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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem