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• W2912896072 abstract "Abstract Thiourea derivative‐based carbon paste electrode (TUD1‐CPE) was constructed as a potentiometric sensor for the determination of salicylate anion in pharmaceutical formulations, Aspocid® and Aspirin®. The optimized CPE contained 45.5 % graphite, 0.5 % reduced graphene oxide (rGO), 46.0 % nitrophenyl octyl ether (NPOE) plasticizer, 5.0 % TUD1 ionophore, and 3.0 % tridodecylmethyl ammonium chloride as additive. The incorporation of NPOE of high dielectric constant, and rGO in electrode caused better performance of the sensor; Nernstian response of 59.0 mV decade −1 in the concentration range of 10 −1 –10 −5 mole L −1 , a detection limit of 1×10 −5 mole L −1 in a very short response time of 6 seconds. The prepared sensor showed high selectivity against similar anions (i. e. , benzoate, I − , SCN − ). Selectivity was confirmed by calculating the formation constant (K β ) using sandwich membrane method, where K β for TUD1‐salicylate is 10 0.43 . Theoretical calculations at DFT‐B3LY/6‐31G** level of theory were performed to find interaction mechanism, Energies of HOMO and LUMO orbitals, non‐linear optical (NLO) properties (the electronic dipole moment (μ), first‐order hyperpolarizability (β), the hyper‐Rayleigh scattering (β HRS ) and the depolarization ratio (DR)), and other global properties; these calculations showed lower values of β and DR, higher value of β HRS , and the shortest lengths of the four N−H bonds between TUD1 and salicylate which confirm their strong complexation and salicylate‐selectivity. Also, all the studied anion‐TUD1 exhibited relatively high NLO properties, and these results were considered as a preliminary study for investigating new types of NLO bearing materials. The sensors were applied successfully for the determination of salicylate anion in Aspocid® and Aspirin®." @default.
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• W2912896072 date "2019-01-29" @default.
• W2912896072 modified "2023-10-14" @default.
• W2912896072 title "Carbon‐based Nanosensors for Salicylate Determination in Pharmaceutical Preparations" @default.
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• W2912896072 doi "https://doi.org/10.1002/elan.201800728" @default.
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