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| Vong, Lilita; Laes, Agathe; Blain, Stéphane. |
| A new method for the non-specific determination of iron-porphyrin-like complexes in natural waters has been developed. It is based on the chemiluminescent oxidation of the luminol in the presence of dioxygen (O-2) at pH 13. The method has been implemented in a FIA manifold that allowed the direct injection of seawater. The limit of detection is 0.11 nM of equivalent hemin (Fe-protoporphyrin IX). Fe2+, Fe3+, H2O2, siderophore (deferoxamin mesylate), humic acid and phytic acid did not interfere when the), were present at the concentrations expected in seawater. Metal free porphyrin and Mg, Cu, Co porphyrin complexes did not induce a significant chemiluminescent signal. Poisoned unfiltered samples could be stored for several weeks before analyses. The new... |
| Tipo: Text |
Palavras-chave: Chemiluminescence; Complexation; Flow injection; Seawater; Porphyrin; Iron. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-3298.pdf |
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| Mazza, Mattia; Alliot, Cyrille; Sinquin, Corinne; Colliec-jouault, Sylvia; Reiller, Pascal E.; Huclier-markai, Sandrine. |
| Background: Exopolysaccharide (EPS) derivatives, produced by Alteromonas infernus bacterium, showed anti-metastatic properties. They may represent a new class of ligands to be combined with theranostic radionuclides, such as 47Sc/44Sc. The goal of this work was to investigate the feasibility of such coupling. (2) Methods: EPSs, as well as heparin used as a drug reference, were characterized in terms of molar mass and dispersity using Asymmetrical Flow Field-Flow Fractionation coupled to Multi-Angle Light Scattering (AF4-MALS). The intrinsic viscosity of EPSs at different ionic strengths were measured in order to establish the conformation. To determine the stability constants of Sc with EPS and heparin, a Free-ion selective radiotracer extraction (FISRE)... |
| Tipo: Text |
Palavras-chave: Exopolysaccharides; Scandium; Theranostic; Characterization; Complexation. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00681/79332/81844.pdf |
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| Hanke,Daniel; Dick,Deborah Pinheiro. |
| ABSTRACT Soils with humic and histic horizons in tropical and subtropical ecosystems play an important role in determining the atmospheric C stock and its stabilization, climate regulation, water holding capacity, and environmental filtering, due to the different functions of soil organic matter (SOM). However, the processes and mechanisms that regulate SOM dynamics in these soils are not clear. The objectives of this study were: i) determine the C and N stocks and ii) investigate the SOM chemical fractions and their interactions with Fe and Al ions in soils with humic and histic horizons of a toposequence under Araucaria moist forest in southern Brazil. The soils sampled were classified as Humic Hapludox (top - not hydromorphic), Fluvaquentic Humaquepts... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Carbon; Stabilization; Complexation; Organo-mineral; Histosol. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100417 |
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