Nico Ueberschaar

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About Nico Ueberschaar:

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SEEK ID: https://data.chembiosys.de/people/71

Location: Germany

ORCID: Not specified

Joined: 29th Sep 2015

Expertise: Synthetic chemistry, LC/MS, GC/MS, HRMS, NMR

Tools: Chromatography, Mass spectrometry, Metabolomics, NMR, Synthetic chemistry

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Z01

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Friedrich Schiller University Jena (FSU), Institute for Inorganic and Analytical Chemistry

Country: Germany

City: Jena

Web page: Not specified

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Sticking together: Inter-species aggregation of bacteria isolated from iron snow iscontrolled by chemical signaling

ChemBioSys I

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We investigated the role of chemical signaling between two co-occurring bacteria that each make up more than 10% of the community in iron-rich lakes aggregates (iron snow) by comparative metagenomics and propose a model that shows rapid iron snow formation and ultimately energy transfer from the photic zone to deeper water layers are controlled via a chemically mediated interplay.

Submitter: Maria Sorokina

Studies: Sticking together: Inter-species aggregation of bacteria isolated from i...

Assays: GC-MS: Sticking together: Inter-species aggregation of bacteria isolated..., LC-MS: Sticking together: Inter-species aggregation of bacteria isolated...

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Created: 27th Nov 2018 at 12:48

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Thermodynamic study on 8-hydroxyquinoline-2-carboxylic acid as a chelating agent for iron found in the gut of Noctuid larvae

C5, Z01

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The recognition of quinolinic carboxylic acids as natural chelants and the recent observation of a high production of 8-hydroxyquinoline-2-carboxylic acid (8-HQA) in the gut of several Noctuid larvae … (e.g. Spodoptera littoralis) has inspired the study of the chelation properties of 8-HQA towards Fe2+ and Fe3+. Here, we report a detailed characterization of the thermodynamic solution behaviour of Fe2+/8-HQA and Fe3+/8-HQA systems as a function of the pH value. The acid–base properties of 8-HQA and its binding ability towards Fe2+ and Fe3+ have been investigated over a wide range of pH values (2.0 ≤ pH ≤ 11.0) by ISE-H+ (glass electrode) potentiometric titrations in KCl(aq) at I = 0.2 mol dm−3 and at T = 298.15 K. For both oxidation states, various FeLqHr species are formed, with q = 1, 2 (and 3), and −2 ≤ r ≤ 1. The presence of the main FeLqHr species was confirmed by HESI-HRMS. ESR measurements have also been performed to get some extra information on the Fe3+ coordination, indicating a distorted octahedral symmetry around the metal center. Quantum mechanical calculations have been carried out in order to characterize the structural features of selected metal complexes. The complexing ability of 8-HQA is generally much higher for Fe3+ than Fe2+. Nevertheless, the sequestering ability of 8-HQA towards these two oxidation states of this metal ion, obtained by the calculation of several pL0.5 values, resulted in it being highly dependent on the pH value: (i) at relatively low pH values, it is higher for Fe3+ (pL0.5 = 6.3 at pH = 3.0) than for Fe2+ (pL0.5 = 3.1 at pH = 3.0); (ii) it is almost the same at pH = 8.1 (Fe3+: pL0.5 = 8.3; Fe2+: pL0.5 = 8.1); (iii) it is higher for Fe2+ at high pH values (pL0.5 = 8.9 for Fe2+ and pL0.5 = 6.2 for Fe3+ at pH = 10.0). The determination of the stability constants of the Fe2+/8-HQA and Fe3+/8-HQA complexes was also complemented by data obtained by the ligand-competition approach, using EDTA as a competing ligand over a wide range of cation and ligand concentrations and ratios. This also allowed a more thorough investigation of both the Fe2+/EDTA and Fe3+/EDTA systems, providing an accurate stability constant dataset for the Fep(EDTA)qHr species under the above-mentioned experimental conditions, which are commonly used in biological studies.

Authors: Sofia Gama, Mariachiara Frontauria, Nico Ueberschaar, Giuseppe Brancato, Demetrio Milea, Silvio Sammartano, Winfried Plass

Date Published: 9th Apr 2018

Publication Type: Not specified

DOI: 10.1039/C7NJ04889K

Citation:

Created: 30th May 2018 at 14:04

DeltaMS: a tool to track isotopologues in GC- and LC-MS data

C5, Z01, INF

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Introduction: Stable isotopic labeling experiments are powerful tools to study metabolic pathways, to follow tracers and fluxes in biotic and abiotic transformations and to elucidate molecules involved …

Authors: Tim U. H. Baumeister, Nico Ueberschaar, Wolfgang Schmidt-Heck, J. Frieder Mohr, Michael Deicke, Thomas Wichard, Reinhard Guthke, Georg Pohnert

Date Published: 27th Feb 2018

Publication Type: Not specified

DOI: 10.1007/s11306-018-1336-x

Citation:

Created: 28th Feb 2018 at 12:35

Sticking together: inter-species aggregation of bacteria isolated from iron snow is controlled by chemical signaling

Total ChemBioSys, C1, C4, Z01

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Marine and lake snow is a continuous shower of mixed organic and inorganic aggregates falling from the upper water where primary production is substantial. These pelagic aggregates provide a niche for …

Authors: J. F. Mori, N. Ueberschaar, S. Lu, R. E. Cooper, G. Pohnert, K. Kusel

Date Published: 1st Feb 2017

Publication Type: Not specified

PubMed ID: 28140394

Citation: ISME J. 2017 May;11(5):1075-1086. doi: 10.1038/ismej.2016.186. Epub 2017 Jan 31.

Created: 8th May 2017 at 09:55, Last updated: 9th Feb 2023 at 08:34

A fast and direct liquid chromatography-mass spectrometry method to detect and quantify polyunsaturated aldehydes and polar oxylipins in diatoms

A1, C1, C5, Z01

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Polyunsaturated aldehydes (PUAs) are a group of microalgal metabolites that have attracted a lot of attention due to their biological activity. Determination of PUAs has become an important routine …

Authors: Constanze Kuhlisch, Michael Deicke, Nico Ueberschaar, Thomas Wichard, Georg Pohnert

Date Published: 15th Oct 2016

Publication Type: Not specified

DOI: 10.1002/lom3.10143

Citation:

Created: 10th Jul 2017 at 08:52

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