Journal ArticleDOI
Determination of nanomolar levels of histidine by differential-pulse adsorptive-cathodic stripping voltammetry of its copper(II) complex
Josino C. Moreira,Arnold G. Fogg +1 more
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TLDR
Guanine was determined at the 5.0×10−10 −2 level by differential-pulse adsorptive stripping voltammetry at a hanging mercury drop electrode using the reduction peak of its copper (II) complex at −0.21 V vs. Ag-AgCl electrode as discussed by the authors.Abstract:
Guanine is determined at the 5.0×10−10 −2.0×10−7 mol/l level by differential-pulse adsorptive stripping voltammetry at a hanging mercury drop electrode using the reduction peak of its copper (II) complex at −0.21 V vs. Ag-AgCl electrode. The optimum analytical conditions were found to be Britton-Robinson buffer solution (pH 4.8), an accumulation potential of 0.0 V and an accumulation time of 3 min. Under these conditions, the detection limit is 5.0×10−10 mol/l and the relative standard deviation 2.6% for 1.0×10−7 mol/l guanine. The method is compared with the previous voltammetric methods. The presence of some purine derivatives does not interfere.read more
Citations
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Electrochemical Metal Ion Sensors. Exploiting Amino Acids and Peptides as Recognition Elements
TL;DR: Amino acids and peptides are known to bind metal ions, in some cases very strongly as discussed by the authors, and there are only a few examples of exploiting this binding in sensors.
Journal ArticleDOI
Electrochemical real-time detection of L-histidine via self-cleavage of DNAzymes.
TL;DR: This proposed sensor protocol offers reasonable selectivity, rapid speed, and operational convenience for real sample assays, and demonstrates excellent enantio-selectivity toward L-histidine.
Journal ArticleDOI
A novel fluorescent probe for selective labeling of histidine
TL;DR: In this paper, a water-soluble fluorescent probe, 1-(2,3-epoxypropoxy)-2-phenylazo-8-acetylamino-naphthalene-3,6-disulfonic acid sodium salt (EPANS), was designed and synthesized by reacting epichlorohydrin with azophloxine, and its properties for labeling of histidine were studied.
Journal ArticleDOI
Selective labeling of histidine by a designed fluorescein-based probe.
TL;DR: The synthesis of a novel fluorescent probe, 3-epoxypropoxy fluorescein (EPF), and its properties for labeling of histidine are described, suggesting that the addition reaction of Histidine with the epoxy group provides the fluorophore moiety with a basic molecular environment.
Journal ArticleDOI
The importance of extracellular speciation and corrosion of copper nanoparticles on lung cell membrane integrity.
TL;DR: The results suggest that membrane damage and ROS formation are stronger induced by Cu NPs and by free or labile Cu ions/complexes compared with Cu bound to biomolecules.
References
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Journal ArticleDOI
Ternary Coordination Complex between Human Serum Albumin, Copper (II), and l-Histidine
Show-Jy Lau,Bibudhendra Sarkar +1 more
TL;DR: Equilibria, existing in the ternary complex system, suggest that the teranary complex may play an important role in the biological transport of Cu(II).
Journal ArticleDOI
Equilibria of the Simultaneously Existing Multiple Species in the Copper(II)–L-Histidine System
TL;DR: In this paper, the complete species distribution and the stability constants of the complex species in the Cu(II)-L-histidine system have been worked out for the pH range 2-11.
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Potentiometric Study of Equilibria in Aqueous Solution between Copper (II) Ions, l (or d)-Histidine and l-Threonine and Their Mixtures
H C Freeman,R P Martin +1 more
TL;DR: The identity of the standardized neutralization curves of corresponding mixtures of Cu( II)-l-histidine-l-threonine and Cu(II)-d-histidine- l-threxine showed that the formation of the mixed complexes is not stereospecific.
Equilibria of the Simultaneously Existing Multiple Species in the
TL;DR: The complete species distribution and the stability constants of the complex species in the Cu(II)–L-histidine system have been worked out for the pH range 2–11 and the method of "analytical potentiometry" has been applied successfully to this system having excess ligand with respect to Cu( II) ion.
Journal ArticleDOI
Differential-pulse adsorptive stripping voltammetry of food and cosmetic synthetic colouring matters and their determination and partial identification in tablet coatings and cosmetics.
TL;DR: Tetraphenylphosphonium chloride was shown to adsorb strongly on a hanging mercury drop electrode and to be amenable to determination by differential-pulse adsorptive stripping voltammetry, a useful reagent for partially identifying individual colouring matters even when they are present at very low concentrations.