Metal Ammine Formation in Aqueous Solution. VI. Stability and Light Absorption of Copper Ethylenediamine Ions.

Bjerrum, Jannik; Nielsen, Erling Juhl; Rautanen, Niilo; Lång, Sylvi; Turunen, Elli; Tuhkanen, Aarne

doi:10.3891/acta.chem.scand.02-0297

Cited by 105 publications

(34 citation statements)

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“…A mixed solution containing AlCl 3 ·6H 2 O (1 mM in deionized water) and oosporein (3 mM in deionized water) was also prepared, and titration was conducted as described above to determine the stability constant for the complex. The stability constant was calculated using Bjerrum’s method [34]. The titration curve for oosporein was shown in S3 Fig, which indicated that oosporein was ionized in two steps, when 1.325 mL and 2.650 mL of 1 M KOH were added, respectively.…”

Section: Methodsmentioning

confidence: 99%

Root-endophytic Chaetomium cupreum chemically enhances aluminium tolerance in Miscanthus sinensis via increasing the aluminium detoxicants, chlorogenic acid and oosporein

et al. 2019

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Miscanthus sinensis Andersson is a pioneer plant species that grows naturally at mining sites. Miscanthus sinensis can detoxify aluminium (Al) by producing phytosiderophores, such as chlorogenic acid, citric acid, and malic acid, and localizing Al in cell walls. Root-endophytic Chaetomium cupreum , which produces microbial siderophores, enhances Al tolerance in M . sinensis . However, we could not determine whether the siderophores produced by C . cupreum actually enhance Al tolerance in M . sinensis , because the microbial siderophores have not yet been identified in previous research. The purpose of this study was to clarify how C . cupreum chemically increases Al tolerance in M . sinensis under acidic mining site conditions, especially considering siderophores. Using instrumental analyses, the siderophore produced by C . cupreum was identified as oosporein. Comparison of the stability constant between Al and phytosiderophores and oosporein indicated that oosporein could detoxify Al similarly to chlorogenic acid, which shows higher stability constant than citric acid and malic acid. Inoculation test of C . cupreum onto M . sinensis in acidic mine soil showed that C . cupreum promoted seedling growth, and enhanced Al tolerance via inducing chlorogenic-acid production and producing oosporein. These results suggested that C . cupreum could chemically enhance Al tolerance and might promote growth via reducing excessive Al in cell walls, the main site of Al accumulation. In addition, the chemical enhancement of Al tolerance by C . cupreum might be important for M . sinensis to adapt to acidic mining sites.

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Section: Methodsmentioning

confidence: 99%

Root-endophytic Chaetomium cupreum chemically enhances aluminium tolerance in Miscanthus sinensis via increasing the aluminium detoxicants, chlorogenic acid and oosporein

et al. 2019

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“…The first quantitative determination of a K A(L) for a ML complex started about 80 years ago when the then newly developed glass electrode and pH metre enabled Jannik Bjerrum to develop the first potentiometric titration method to evaluate the equilibrium 1a quantitatively by introducing a proton competition for the metal ligand into the system which is described by equation 2 [ 13 ]:

Potentiometry is still the gold standard, even today, for the accurate determination of association constants defined by equation 1b. However, this method is subject to a strict limitation: the equilibria of all exchangeable protons in the system must be accounted for [ 14 , 15 ].…”

Section: Metal–protein Affinity and The Conditional Dissociation Consmentioning

confidence: 99%

Principles and practice of determining metal–protein affinities

Young

Xiao

2021

Biochemical Journal

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Metal ions play many critical roles in biology, as structural and catalytic cofactors, and as cell regulatory and signalling elements. The metal–protein affinity, expressed conveniently by the metal dissociation constant, KD, describes the thermodynamic strength of a metal–protein interaction and is a key parameter that can be used, for example, to understand how proteins may acquire metals in a cell and to identify dynamic elements (e.g. cofactor binding, changing metal availabilities) which regulate protein metalation in vivo. Here, we outline the fundamental principles and practical considerations that are key to the reliable quantification of metal–protein affinities. We review a selection of spectroscopic probes which can be used to determine protein affinities for essential biological transition metals (including Mn(II), Fe(II), Co(II), Ni(II), Cu(I), Cu(II) and Zn(II)) and, using selected examples, demonstrate how rational probe selection combined with prudent experimental design can be applied to determine accurate KD values.

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“…By combining MD data, scCO 2 extraction data, and complexation theory, [27] we can propose ar eaction mechanism for the complexation process. We use the known coordination numbers for lithium and sodium of four and six, respectively,a nd incorporate the interactions between lithium and water and the cation exchanger (see section 3.1).…”

Section: Reaction Mechanismmentioning

confidence: 99%

A Quantitative Metric for the Design of Selective Supercritical CO₂ Extraction of Lithium from Geothermal Brine

et al. 2019

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As demand grows for lithium, its recovery from geothermal brines provides an attractive alternative to slow mining. One promising extraction method uses crown ethers as extractants in supercritical carbon dioxide with cation exchangers to facilitate extraction from brine. Molecular dynamics modeling is used to understand the mechanism of binding between lithium (or sodium) and combinations of 14‐crown‐4 ethers and cation exchangers, and the predictive capability of computational modeling to test lithium selectivity is established for four combinations of crown ethers [methylene‐14‐crown‐4 (M14C4) and a fluorinated 14‐crown‐4 (F14C4)] and cation exchangers [di(2‐ethyl‐hexyl)phosphoric acid (HDEHP) and tetraethylammonium perfluoro‐1‐octanesulfonate (TPFOS)]. Binding free energies (given in kcal mol−1) of lithium and sodium, respectively, to crown ether–cation exchangers are 85 and 71 for M14C4–HDEHP, 90 and 71 for F14C4–HDEHP, 93 and 80 for M14C4–TPFOS, and 104 and 93 for F14C4–TPFOS. Good agreement is found between computational predictions and supercritical carbon dioxide extraction experiments at 60 °C and 250 bar. Binding free energy gives a suitable metric to describe extraction efficiency. Differences in the binding free energies of sodium and lithium to crown ethers determine the extraction selectivity. Fluorine groups are found to exert a positive influence to optimize extraction efficiency. Of the systems studied, F14C4 with TPFOS offers the most selective and efficient extraction system.

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Metal Ammine Formation in Aqueous Solution. VI. Stability and Light Absorption of Copper Ethylenediamine Ions.

Cited by 105 publications

References 0 publications

Root-endophytic Chaetomium cupreum chemically enhances aluminium tolerance in Miscanthus sinensis via increasing the aluminium detoxicants, chlorogenic acid and oosporein

Root-endophytic Chaetomium cupreum chemically enhances aluminium tolerance in Miscanthus sinensis via increasing the aluminium detoxicants, chlorogenic acid and oosporein

Principles and practice of determining metal–protein affinities

A Quantitative Metric for the Design of Selective Supercritical CO₂ Extraction of Lithium from Geothermal Brine

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Metal Ammine Formation in Aqueous Solution. VI. Stability and Light Absorption of Copper Ethylenediamine Ions.

Cited by 105 publications

References 0 publications

Root-endophytic Chaetomium cupreum chemically enhances aluminium tolerance in Miscanthus sinensis via increasing the aluminium detoxicants, chlorogenic acid and oosporein

Root-endophytic Chaetomium cupreum chemically enhances aluminium tolerance in Miscanthus sinensis via increasing the aluminium detoxicants, chlorogenic acid and oosporein

Principles and practice of determining metal–protein affinities

A Quantitative Metric for the Design of Selective Supercritical CO2 Extraction of Lithium from Geothermal Brine

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A Quantitative Metric for the Design of Selective Supercritical CO₂ Extraction of Lithium from Geothermal Brine