Turkish Journal of Chemistry
DOI
10.3906/kim-1208-10
Abstract
Polycation-sensitive membrane electrodes based on dinonylnaphthalene sulfonate (DNNS) were examined for the determination of some polyanions, namely xanthan (Xanth), alginate (Alg), carboxymethyl cellulose (CMC), and carrageenan (Carr). The potentiometric titrations of polyanionic analytes yielded sharp end points and correlative stoichiometries. After the determinations were successfully performed in saline, these polyanions were also determined in some food products consumed in Bolu (Turkey). In addition, the titration data were used to estimate the interactions between titrant and polyanionic analytes. The equilibrium constants, K_{eq}, and the number of titrant binding sites (n) per mole of analyte polyanion were calculated using Scatchard plots. The accuracy of the assayed method was confirmed by recovery experiments in spiked samples. Dynamic ranges for the determination of polyanionic analytes were 2--20 \mu g/mL for CMC, 1--8 \mu g/mL for Xanth, 0.5--4 \mu g/mL for Alg, and 2--20 \mu g/mL for Carr. LOD values were
Keywords
Xanthan, alginate, carboxymethyl cellulose, polycation-sensitive, potentiometric sensors, Scatchard plot, binding constant
First Page
308
Last Page
315
Recommended Citation
DÜRÜST, NEDİME and KAYANSALAN, ALİ
(2013)
"Potentiometric determination of some food additives and their binding to a polycationic species using polyion sensors,"
Turkish Journal of Chemistry: Vol. 37:
No.
2, Article 14.
https://doi.org/10.3906/kim-1208-10
Available at:
https://journals.tubitak.gov.tr/chem/vol37/iss2/14
