Agarose hydrogel containing immobilized pH buffer microemulsion without increasing permselectivity

Crespi, Miguel Coll1; Crespo, Gaston A.2; Xie, Xiaojiang3; Touilloux, Romain1; Tercier-Waeber, Marylou1; Bakker, Eric1

2018-01-15

10.1016/j.talanta.2017.08.053

TALANTA   影响因子和分区

0039-9140

1873-3573

A heterogeneous pH buffer based on a colloidal emulsion containing ion-exchanger and lipophilic base is described that can be integrated into hydrogels without affecting their ion-exchange properties. Each sphere works on the basis of reversible ion-exchange of hydrogen ions with solution cations, acting as a pH buffer while staying removed from solution in the nonpolar core of the spheres. The ion-exchange mechanism is supported by titration experiments in aqueous emulsion, showing that the nature and concentration of the exchanging solution cations influences the buffer action, with increasing lipophilicity moving the equilibrium to lower pH values. Agarose gels with entrapped pH buffer emulsions and mounted in a transport cell are shown by zero current potentiometry to exhibit negligible permselective properties above an ionic strength of 1 mM, a behavior no different from unmodified agarose, with an observed ion-exchanger concentration of 7 mM in dry agarose. This suggests that such pH buffers do not give rise to substantial ion-exchange properties of the gel material. In a first attempt to control the pH in the vicinity of an electrode surface by this approach, the emulsion was entrapped in an agarose gel in direct contact with a pH electrode, demonstrating the ability to buffer such gel films.

Heterogeneous pH buffer Tridodecylamine Ionophore Agarose Hydrogel membranes Permselectivity Donnan failure

SCI ; EI

英语

其他

European Union[FP7-GA 614002-SCHeMA]

Chemistry

Chemistry, Analytical

WOS:000416394300022

ELSEVIER SCIENCE BV

20173504092576

Electrodes ; Emulsification ; Hydrogels ; Ion exchangers ; Ionic strength ; Ionophores ; Microemulsions ; pH effects ; Positive ions ; Potentiometric sensors ; Titration

Chemistry:801 ; Chemical Apparatus and Plants; Unit Operations; Unit Processes:802 ; Chemical Products Generally:804

CHEMISTRY

Web of Science

1.Univ Geneva, Dept Inorgan & Analyt Chem, Quai Ernest Ansermet 30, CH-1211 Geneva, Switzerland
2.KTH Royal Inst Technol, Appl Phys Chem Div, Tekn Ringen 30, SE-10044 Stockholm, Sweden
3.Southern Univ Sci & Technol, Dept Chem, Shenzhen 518000, Peoples R China

Crespi, Miguel Coll,Crespo, Gaston A.,Xie, Xiaojiang,et al. Agarose hydrogel containing immobilized pH buffer microemulsion without increasing permselectivity[J]. TALANTA,2018,177:191-196.

Crespi, Miguel Coll,Crespo, Gaston A.,Xie, Xiaojiang,Touilloux, Romain,Tercier-Waeber, Marylou,&Bakker, Eric.(2018).Agarose hydrogel containing immobilized pH buffer microemulsion without increasing permselectivity.TALANTA,177,191-196.

Crespi, Miguel Coll,et al."Agarose hydrogel containing immobilized pH buffer microemulsion without increasing permselectivity".TALANTA 177(2018):191-196.