A disposable, simple, fast and low-cost paper-based biosensor and its application to the determination of glucose in commercial orange juices

Leonor Guadarrama-Fernández, Marta Novell, Pascal Blondeau, Francisco J.Andrade
Food Chemistry 2018, 265, 64-69
doi: 10.1016/j.foodchem.2018.05.082

A new biosensor for monitoring glucose levels in beverages is presented. The methodology presented herein does not require complex samples treatment, offering an alternative to conventional methods, particularly for determinations performed with minimal expertise and without a laboratory infrastructure.

Enhanced potentiometric detection of hydrogen peroxide using a platinum electrode coated with nafion

Marc Parrilla, Rocío Cánovas, Francisco J. Andrade
Electroanalysis 2017, 29, 223-230
doi: 10.1002/elan.201600403

The potentiometric response to hydrogen peroxide of a platinum electrode coated with a layer of Nafion is presented. The Nafion membrane acts as an effective permselective barrier, reducing the response to some redox active species, such as ascorbate. These Nafion coated electrodes show a significantly enhanced sensitivity to hydrogen peroxide when the measurements are performed in solutions of high ionic strength.

A Simple and Versatile Approach for the Fabrication of Paper-Based Nanocatalysts: Low Cost, Easy Handling, and Catalyst Recovery

L. Montiel, J. A. Delgado, M. Novell, F. J. Andrade, C. Claver, P. Blondeau, C. Godard. ChemCatChem 2016, 8, 3041. Doi: 10.1002/cctc.201600666

A versatile method for the preparation of efficient and reusable nanocatalysts involving the painting of a commercial filter paper with a Pd@CNT was presented for the semihydrogenation of alkynes and alkynols.

ChemCatChem graphical abstract

Characterization of a new ionophore-based ion-selective electrode for the potentiometric determination of creatinine in urine

T. Guinovart, D. Hernández-Alonso, L. Adriaenssens, P. Blondeau, F. X. Rius, P. Ballester, F. J. Andrade. Biosensors and Bioelectronics, 2017, 87, 587. doi: 10.1016/j.bios.2016.08.025

The optimization, analytical characterization and validation of a novel ion-selective electrode for the highly sensitive and selective determination of creatinine in urine is presented.

Ion-selective electrode for the potentiometric determination of creatinine in urine

 

The optimization, analytical characterization and validation of a novel ion-selective electrode for the highly sensitive and selective determination of creatinine in urine is presented. A newly synthesized calix[4]pyrrole-based molecule is used as an ionophore for the enhanced recognition of creatininium cations. The calculation of the complex formation constants in the polymeric membrane with creatininium, potassium and sodium confirms the strong selective interactions between the ionophore and the target. The optimization of the potentiometric sensor presented here yields an outstanding analytical performance, with a linear range that spans from 1 µM to 10 mM and limit of detection of 10?6.2 M. The calculation of the selectivity coefficients against most commonly found interferences also show significant improvements when compared to other sensors already reported. The performance of this novel sensor is tested by measuring creatinine in real urine samples (N=50) and comparing the values against the standard colorimetric approach (Jaffé’s reaction). The results show that this sensor allows the fast and accurate determination of creatinine in real samples with minimal sample manipulation.