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Perfluorosulfonic Acid Membranes Thermally Treated and Modified by Dopants with Proton-Acceptor Properties for Asparaginate and Potassium Ions Determination in Pharmaceuticals

1
Department of Analytical Chemistry, Voronezh State University, Universitetskaya pl., 1, Voronezh 394018, Russia
2
Kurnakov Institute of General and Inorganic Chemistry RAS, Leninsky pr., 31, Moscow 119991, Russia
3
Department of Chemistry, Moscow State University, Leninskie Gory, 1(3), Moscow 119991, Russia
*
Author to whom correspondence should be addressed.
Membranes 2019, 9(11), 142; https://doi.org/10.3390/membranes9110142
Received: 2 October 2019 / Revised: 24 October 2019 / Accepted: 27 October 2019 / Published: 30 October 2019
(This article belongs to the Special Issue Ion-Exchange Membranes and Processes)
The influence of incorporation of the dopants with proton-acceptor properties into perfluorosulfonic acid cation exchange membranes (MF-4SC and Nafion), and their treatment conditions on the characteristics of Donnan potential (DP)-sensors (analytical signal is the Donnan potential) in the aqueous solutions containing asparaginate and potassium ions in a wide pH range was investigated. A silica, surface modified by 3-aminopropyl and 3-(2-imidazolin-1-yl)-propyl groups, was used as the dopant. The membranes were subjected to mechanical deformation and thermal treatment at various relative humidities. The relationship between water uptake and diffusion permeability of membranes subjected to modification and treatment and the cross sensitivity of DP-sensors based on them to counter and co-ions was studied. The multisensory systems for the simultaneous determination of asparaginate and potassium ions in a concentration range from 1.0 × 10−4 to 1.0 × 10−2 M and pH range from 4 to 8 were developed. An array of cross-sensitive DP-sensors based on MF-4SC membranes containing 3 wt.% SiO2 modified by 10 mol.% 3-aminopropyl and 3-(2-imidazolin-1-yl)-propyl was used for the potassium asparaginate hemihydrate and magnesium asparaginate pentahydrate determination in Panangin® (with an error of 2 and 4%, respectively). View Full-Text
Keywords: potentiometric multisensory systems; cross sensitivity; DP-sensors; perfluorosulfonic acid cation exchange membranes; silica; membrane thermal treatment; membrane mechanical deformation; aspartic acid; pharmaceuticals potentiometric multisensory systems; cross sensitivity; DP-sensors; perfluorosulfonic acid cation exchange membranes; silica; membrane thermal treatment; membrane mechanical deformation; aspartic acid; pharmaceuticals
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MDPI and ACS Style

Parshina, A.; Kolganova, T.; Safronova, E.; Osipov, A.; Lapshina, E.; Yelnikova, A.; Bobreshova, O.; Yaroslavtsev, A. Perfluorosulfonic Acid Membranes Thermally Treated and Modified by Dopants with Proton-Acceptor Properties for Asparaginate and Potassium Ions Determination in Pharmaceuticals. Membranes 2019, 9, 142.

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