Agarose hydrogel containing immobilized pH buffer microemulsion without increasing permselectivity

Crespi, Miguel Coll; Crespo, Gastón A.; Xie, Xiaojiang; Touilloux, Romain; Tercier‐Waeber, Mary‐Lou; Bakker, Eric

doi:10.1016/j.talanta.2017.08.053

Cited by 2 publications

(2 citation statements)

References 24 publications

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“…Agarose-based hydrogel microemulsions have been developed as pH buffer components without impacting on the selectivity of ion-exchange resins [59] . These materials could be employed as coatings for the gold/silica sensing nanoparticles described in this work.…”

Section: Sensing Mechanismmentioning

confidence: 99%

Ultrasensitive and miniaturized ion sensors using ionically imprinted nanostructured films

Ruiz-Gonzalez

Huang

Cao

et al. 2022

Applied Materials Today

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Section: Sensing Mechanismmentioning

confidence: 99%

Ultrasensitive and miniaturized ion sensors using ionically imprinted nanostructured films

Ruiz-Gonzalez

Huang

Cao

et al. 2022

Applied Materials Today

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“…They have subsequently been applied as efficient ion-selective titration reagents because convective equilibration is much more efficient with microemulsions compared to traditional two-phase systems [12]. Very recently, such materials were made pH responsive by addition of a lipophilic base together with a cation-exchanger and embedded into hydrogel layers to provide for a localized pH buffer in electrochemical sensors [13].…”

Section: Introductionmentioning

confidence: 99%

Ion‐exchange Microemulsions for Eliminating Dilute Interferences in Potentiometric Determinations

et al. 2018

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We report here for the first time on the use of functional microemulsions in potentiometric assays to remove dilute interferences from solution when measuring high concentrations of analyte. The microemulsions are similarly formulated to the ion‐selective membrane used in the measurement and act as sacrificial material. They are here stabilized by the triblock copolymer pluronic F‐127 and contain the chloride salt of the tridodecylmethylammonium cation, which also serves as anion‐exchanger in the membrane electrode. Both membrane and microemulsion are preconditioned with chloride. If an anionic interference is present at moderate concentration, the rapid equilibration with the functionalized microemulsion results in a quantitative removal. The principle is explored with salicylate as common interference in the detection of chloride in physiological samples. The data agree well to an equilibrium ion‐exchange model for the microemulsion. Salicylate levels up to millimolar can be effectively removed. Unfortunately, quaternary ammonium salt from the microemulsion is found to contaminate the ion‐selective membrane phase. Indeed, a cation‐exchanging valinomycin membrane in contact with concentrated anion‐exchanging microemulsions shows a large potential increase. This indicates that the membrane changes from cation to anion permselectivity. This contamination of the membrane by the microemulsion phase must be overcome for a practical application of the approach.

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Agarose hydrogel containing immobilized pH buffer microemulsion without increasing permselectivity

Cited by 2 publications

References 24 publications

Ultrasensitive and miniaturized ion sensors using ionically imprinted nanostructured films

Ultrasensitive and miniaturized ion sensors using ionically imprinted nanostructured films

Ion‐exchange Microemulsions for Eliminating Dilute Interferences in Potentiometric Determinations

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