Advancing 2D imaging of ammonium for biological application: Planar and nanoparticle-based ion-selective optodes

Kalinichev, Andrey V.; Koren, Klaus

doi:10.1016/j.snb.2024.135889

Sensors and Actuators B: Chemical

2024

DOI: 10.1016/j.snb.2024.135889

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Advancing 2D imaging of ammonium for biological application: Planar and nanoparticle-based ion-selective optodes

Andrey V. Kalinichev,

Klaus Koren

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Exploiting the pH-Cross Sensitivity of Ion-Selective Optodes to Broaden Their Response Range

Steininger,

Palmfeldt,

Koren

et al. 2024

ACS Sens.

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While the pH cross-sensitivity of chromoionophore-based ion-selective optodes (ISOs) has often been regarded as a significant limitation, this paper demonstrates how this apparent drawback can be transformed into a beneficial feature. The response range of chromoionophore-based ISOs shifts proportionally with changes in the sample pH. Thus, integrating them with a stable pH gradient across the optode surface, such as those provided by immobilized pH gradient (IPG) gels, allows for significant enhancement of the effective measuring range of chromoionophore-based ISOs while preserving their maximum sensitivity. We show that the measuring range of sodium-selective chromoionophore-based optodes can be increased up to 2.5 log units when used with commercially available IPG gels. This improvement in measuring range is directly correlated with the pH difference in the pH gradient across the optode, suggesting that even greater enhancements are possible with more substantial pH gradients. Furthermore, this approach is not confined to sodium-selective optodes but can be readily adapted to other ion-selective chromoionophore-based optodes, broadening their potential applications and impact in the field of chemical sensing. This work paves the way for the development of more versatile and highly sensitive optodes across a broad range of analytes, leveraging the pH cross-sensitivity as a tool for enhanced performance.

show abstract

Exploiting the pH-Cross Sensitivity of Ion-Selective Optodes to Broaden Their Response Range

Steininger,

Palmfeldt,

Koren

et al. 2024

ACS Sens.

View full text Add to dashboard Cite

show abstract

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Advancing 2D imaging of ammonium for biological application: Planar and nanoparticle-based ion-selective optodes

Cited by 1 publication

References 57 publications

Exploiting the pH-Cross Sensitivity of Ion-Selective Optodes to Broaden Their Response Range

Exploiting the pH-Cross Sensitivity of Ion-Selective Optodes to Broaden Their Response Range

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