A novel approach for the design of a highly selective sulfate-ion-selective electrode

Sathyapalan, Amarchand; Zhou, Anhong; Kar, Tapas; Zhou, Feng; Su, Haibin

doi:10.1039/b817957c

Cited by 15 publications

(8 citation statements)

References 31 publications

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“…Nevertheless, the very strong interaction determined for receptor 2 with sulfate, still makes possible that this anion can be detected by the electrode. Only few examples of sulfateselective electrodes have been reported in the literature using synthetic ionophores (either metalorganic, 69 positively charged 70 or neutral [71][72][73][74][75][76] ). Regarding the electrode fabricated with receptor 2, the wide concentration range with a Nernstian response, the low detection limit and the fast response time (Table 3) are features that support its suitability to be applied for the determination of the sulfate anion.…”

Section: àmentioning

confidence: 99%

Binding studies and anion-selective electrodes with neutral isophthalamide-based receptors

Más‐Montoya

Cuartero

Curiel

et al. 2015

Analyst

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Two acyclic isophthalamide-based hosts have been synthesised and their anion binding properties have been evaluated by (1)H-NMR titrations. Different binding modes have been detected for the series of tested anions. The attachment of aminomethylpyrrole groups resulted in an improved binding selectivity. Additionally, the receptors have been incorporated as ionophores in plasticised polymeric membrane-based anion-selective electrodes. The potentiometric studies were in agreement with the NMR experiments and revealed a good sensing ability, considering the structural simplicity of the receptors and their interactions purely based on hydrogen bonding. These preliminary experiments have revealed an interesting selectivity towards highly hydrophilic anions such as fluoride and sulfate. Moreover, a particularly low detection limit (9 × 10(-7) M) has been determined for the fluoride anion.

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Section: àmentioning

confidence: 99%

Binding studies and anion-selective electrodes with neutral isophthalamide-based receptors

Más‐Montoya

Cuartero

Curiel

et al. 2015

Analyst

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“…13 As a result, membrane-based anion sensors typically display a selectivity pattern that closely follows the partition coefficients between the aqueous and the organic phases, commonly known as the Hofmeister series. Therefore, despite the development of selective ionophores, [14][15][16] the determination of highly hydrophilic divalent anions in complex matrices remains a challenge. This is the case of the determination of sulphate in urine where both specific interferences due to other anions as well as matrix effects might be present.…”

mentioning

confidence: 99%

Sulphate-selective optical microsensors: overcoming the hydration energy penalty

2015

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Novel membrane-free chemically modified polystyrene microspheres for the optical detection of sulphate in aqueous media are introduced. The working principle of this sensor is based on the surface mass-extraction equilibrium of the target species. This allows overcoming the strong hydration energy penalty, a typical problem for the detection of divalent anions. This optical sensor exhibits both enhanced sensitivity and selectivity, which allows the accurate detection of sulphate in biological samples. To illustrate these features the determination of sulphate in urine is presented.

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“…11 Such molecular probes have also been used for the quantitative determination of sulfate in solution phase but are in general applicable in aprotic solvents like CH 3 CN, CHCl 3 and DMSO or solvent systems with <5% water. 12 To the best of our knowledge, there are only couple of examples, 13,14 where sulfate has been recognized in methanol-H 2 O (1 : 1) using uorescence as a tool 13 or a bis-hydroxyl Schiff base molecule has been used to develop ion-selective electrode 14 for the estimation of sulfate within pH range 3-9. Therefore, the design of optical probes for the determination/recognition of sulfate in aqueous systems especially in the presence of calcium, magnesium and sodium ions remain a challenge.…”

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confidence: 99%

A fluorescent probe for the selective detection of sulfate ions in water

Saini

Kumar

2013

RSC Adv.

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A nicotinamide-anthracene conjugate based fluorescent probe 1 exhibits highly selective fluorescence enhancement at 535 nm only with sulfate in HEPES buffer-DMSO (9 : 1) at pH 7.4. The other anions viz.F À , Cl À , Br À , I À , AcO À , HSO 4 À , H 2 PO 4 À , CN À , OH À , NO 3 À , ClO 4 À , SCN À , even if present in excess, do not interfere in the estimation of sulfate. The limit of detection for sulfate ions by probe 1 is 0.5 mM. Probe 1 can also be used to determine the sulfate ions in tap water using EDTA as a metal ion masking agent.Titration experiments and Job's plot reveal the formation of a 1 : 1 stoichiometric complex between the probe 1 and sulfate ions and DFT studies show the electron transfer from SO 4 2À to anthracene moiety responsible for the observed optical changes.The sulfate ion plays a signicant role in the environment 1 and is crucial for many biochemical processes, such as in biosynthesis 2 and sulfate binding proteins. 3 In nature, Gram-negative bacterium Salmonella typhimurium possesses sulfate binding proteins (SBP) in the periplasmic space between the inner cytoplasmic membrane and the external outer membrane which are responsible for tight binding of the sulfate that has passively diffused into the periplasm across the external outer membrane. This protein selectively binds sulfate with an association constant ca. 10 6 M À1 in water and its affinity is independent of pH over the range pH 5 to pH 8. Sulfate is also responsible for the permanent hardness of water; 4 hampers the vitrication process 5 of nuclear waste sites and thus is a known inorganic pollutant in the environment. As a result, the design of suitable hosts for the selective recognition of sulfate remains a challenge in the area of anion binding chemistry. In nature, a seven-coordinate sulfate structure was observed in a sulfate binding protein, where three of four oxygens were linked with two hydrogen bonds. 6 Many synthetic receptors bearing amide, 7 pyrrole, 8 urea, 9 thiourea 10 as motifs for the selective binding of sulfate have been reported. The tripodal molecular probes with three urea/thiourea units appended with different substituents on urea/thiourea nitrogen as strong H-bond donor sites encapsulate sulfate in the presence of hydrophobic tetrabutylammonium as counter cation. 9a,b,10b More recently, Jiang, Lin et al. have shown that squaramide-based tripodal receptor selectively encapsulates sulfate over other anions. 11Such molecular probes have also been used for the quantitative determination of sulfate in solution phase but are in general applicable in aprotic solvents like CH 3 CN, CHCl 3 and DMSO or solvent systems with <5% water. 12 To the best of our knowledge, there are only couple of examples, 13,14 where sulfate has been recognized in methanol-H 2 O (1 : 1) using uores-cence as a tool 13 or a bis-hydroxyl Schiff base molecule has been used to develop ion-selective electrode 14 for the estimation of sulfate within pH range 3-9. Therefore, the design of optical probes for the determination/recognitio...

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A novel approach for the design of a highly selective sulfate-ion-selective electrode

Cited by 15 publications

References 31 publications

Binding studies and anion-selective electrodes with neutral isophthalamide-based receptors

Binding studies and anion-selective electrodes with neutral isophthalamide-based receptors

Sulphate-selective optical microsensors: overcoming the hydration energy penalty

A fluorescent probe for the selective detection of sulfate ions in water

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