PubMed Health⌕ Search
Home/Archive/PubMed

PubMed · 11192166

Ion chromatography detector based on solid-state ion-selective electrode array.

D K Lee·H J Lee·G S Cha·H Nam·K J Paeng
View original source ↗Export metadata ↓

Abstract

A variety of neutral carrier type ionophores for monovalent cations were employed to prepare solid-state cation-selective electrodes (SSEs) for use as a detector in single-column ion chromatography (IC). The polyurethane-based pseudoreference electrode made it possible to assemble an array type SSE detector for IC. An SSE-based detector provides not only the overall chromatogram for the separated ion species (monensin methyl ester-nonactin-based membrane), but also the enhanced chromatogram for specified ions of interest (valinomycin as K+ and nonactin for NH4+). This feature makes it possible to perform highly quantitative analysis with low detection limits even if the separation efficiency of the ion-exchange is not sufficient. Since SSE-based IC detectors are easily miniaturized and replaceable at low cost, they are an ideal component of a portable IC system.

Explore related subjects

Cations, MonovalentChromatography, Ion ExchangeElectrodesLithiumMacrolidesPotassiumQuaternary Ammonium CompoundsSodiumValinomycinWaterJournal ArticleResearch Support, Non-U.S. Gov't

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

D K Lee, H J Lee, G S Cha, H Nam, K J Paeng. 2000-12-15. Ion chromatography detector based on solid-state ion-selective electrode array.. https://doi.org/10.1016/s0021-9673(00)00844-x

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related citations

PubMed2002

Effects of potassium halides on bacterial bioluminescence.

The effects of potassium halides KCl, KBr and KI on NADH:FMN-oxidoreductase-luciferase bioluminescent coupled enzyme system were studied. The influence of salt additions on bioluminescence intensity and bioluminescence light yield was investigated. The inhibition and activation parameters of the salts were calculated using their dependencies on concentration of the salts. The correlation between the inhibition of bioluminescence intensity and the halide mass was demonstrated: the inhibiting ability of the salts increases with the increase of atomic weight of the anions. The inhibition parameters increase and the activation parameters decrease, accordingly.

Cations, Monovalent↗
PubMed2001

Effect of metal ion and water coordination on the structure of a gas-phase amino acid.

The mode of metal ion and water binding to the amino acid valine is investigated using both theory and experiment. Computations indicate that without water, the structure of valine is nonzwitterionic. Both Li(+) and Na(+) are coordinated to the nitrogen and carbonyl oxygen (NO coordination), whereas K(+) coordinates to both oxygens (OO coordination) of nonzwitterionic valine. The addition of a single water molecule does not significantly affect the relative energies calculated for the cationized valine clusters. Experimentally, the rates of water evaporation from clusters of Val.M(+)(H(2)O)(1), M = Li, Na, and K, are measured using blackbody infrared radiative dissociation. The dissociation rate from the valine complex is compared to water evaporation rates from model complexes of known structure. These results indicate that the metal ion in the lithiated and the sodiated clusters is NO-coordinated to nonzwitterionic valine, while that in the potassiated cluster has OO coordination, in full agreement with theory. The zwitterionic vs nonzwitterionic character of valine in the potassiated cluster cannot be distinguished experimentally. Extensive modeling provides strong support for the validity of inferring structural information from the kinetic data.

Cations, Monovalent↗
PubMed2001

Influence of sodium ions on the dynamics and structure of single-stranded DNA oligomers: a molecular dynamics study.

The effects of sodium counterion presence and chain length on the structure and dynamics of single DNA strands of polythymidylate were studied by means of molecular dynamics simulations. The importance of the base-base stacking phenomenon increases with the chain length and partially reduces the flexibility of the strand. Sodium ions directly interact with the phosphate groups and keto oxygens of the thymine bases, complexes showing lifetimes below 400 ps. Simultaneous phosphate and keto complexes were observed for one of the sodium ions with lifetimes around 1 ns. The implications of such complexes in the folding process experienced by the strand are considered. Structurally, cation inner- and outer-sphere complexes were observed in the coordination of phosphate groups. For the inner-sphere complexes, the structural information retrieved from the simulations is in very good agreement with experimental data. The diffusion properties of the sodium ions also reflect both types of coordination modes.

Cations, Monovalent↗