Iron Oxalate Humboldtine Crystallization by Fungus Aspergillus niger

Zelenskaya, Marina S.; Izatulina, Alina R.; Frank-Kamenetskaya, O. V.; Vlasov, Dmitry Yu.

doi:10.3390/cryst11121591

Cited by 3 publications

(1 citation statement)

References 31 publications

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“…The study of the crystallization of copper oxalate is very interesting and promising, since copper is a toxic element and the formation of insoluble copper oxalate (moolooite) can be used in the bioremediation technologies for copper-contaminated environmental objects with the help of oxalate-producing microorganisms [ 4 , 14 , 15 , 16 ]. For example, Tsekova [ 17 ] described the recovery of copper and other metals from industrial wastewater using Aspergillus niger , which is one of the most commonly used models of oxalate-producing micromycetes [ 4 , 18 , 19 ]. Moreover, numerous publications on applications in industry due to the display of interesting physical and chemical properties, including antiferromagnetic ones [ 20 , 21 ], and due to it acting as a precursor to the formation of a number of widely used nanoparticles, such as Cu, CuO, Cu 2 O and Cu(OH) 2 [ 4 , 22 , 23 , 24 ], can be found for copper oxalate.…”

Section: Introductionmentioning

confidence: 99%

Crystal Chemistry of the Copper Oxalate Biomineral Moolooite: The First Single-Crystal X-ray Diffraction Studies and Thermal Behavior

Kornyakov

Gurzhiy

Kuz’mina

et al. 2023

IJMS

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Moolooite, Cu(C2O4)·nH2O, is a typical biomineral which forms due to Cu-bearing minerals coming into contact with oxalic acid sources such as bird guano deposits or lichens, and no single crystals of moolooite of either natural or synthetic origin have been found yet. This paper reports, for the first time, on the preparation of single crystals of a synthetic analog of the copper-oxalate biomineral moolooite, and on the refinement of its crystal structure from the single-crystal X-ray diffraction (SCXRD) data. Along with the structural model, the SCXRD experiment showed the significant contribution of diffuse scattering to the overall diffraction data, which comes from the nanostructural disorder caused by stacking faults of Cu oxalate chains as they lengthen. This type of disorder should result in the chains breaking, at which point the H2O molecules may be arranged. The amount of water in the studied samples did not exceed 0.15 H2O molecules per formula unit. Apparently, the mechanism of incorporation of H2O molecules governs the absence of good-quality single crystals in nature and a lack of them in synthetic experiments: the more H2O content in the structure, the stronger the disorder will be. A description of the crystal structure indicates that the ideal structure of the Cu oxalate biomineral moolooite should not contain H2O molecules and should be described by the Cu(C2O4) formula. However, it was shown that natural and synthetic moolooite crystals contain a significant portion of “structural” water, which cannot be ignored. Considering the substantially variable amount of water, which can be incorporated into the crystal structure, the formula Cu(C2O4)·nH2O for moolooite is justified.

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Section: Introductionmentioning

confidence: 99%

Crystal Chemistry of the Copper Oxalate Biomineral Moolooite: The First Single-Crystal X-ray Diffraction Studies and Thermal Behavior

Kornyakov

Gurzhiy

Kuz’mina

et al. 2023

IJMS

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Encapsulating magnetite nanopowder with fungal biomass: Investigating effects on chemical and mineralogical stability

Vyhnáleková,

Miglierini,

Dekan

et al. 2024

Separation and Purification Technology

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Oxalate Crystallization under the Action of Brown Rot Fungi

et al. 2023

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Brown rot fungi belong to the wood-rotting fungi, which produce oxalic acid and actively decompose wood. We first found oxalates formed under the action of brown rot fungi in natural conditions on stone (Rogoselga adit, Karelia, Russia), proposed a model for their formation, and confirmed the hypothesis that frequent occurrence of metal oxalates in mines and adits may be associated with the activity of these fungi. We synthesized under the action of four species of brown-rot fungi (Serpula himantioides, Serpula lacrymans, Coniophora puteana, Antrodia xantha) on different mineral substrates analogs of all known biofilm oxalate minerals and oxalates of such toxic heavy metals as Pb, Cu, Mn. In addition, we compared the features of oxalate formation under the action of brown rot fungi and soil fungus Aspergillus niger, an active oxalic acid producer, widely used in model experiments and recommended for application in biotechnologies. It is shown that in contrast to A.niger, the contribution of the metabolic activity of brown rot fungi to oxalate crystallization exceeds the contribution of the underlying minerals. The prospects for the use of brown rot fungi such as Serpula himantioides, Coniophora puteana, and Antrodia xantha in modern environmentally friendly biotechnologies are justified.

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Iron Oxalate Humboldtine Crystallization by Fungus Aspergillus niger

Cited by 3 publications

References 31 publications

Crystal Chemistry of the Copper Oxalate Biomineral Moolooite: The First Single-Crystal X-ray Diffraction Studies and Thermal Behavior

Crystal Chemistry of the Copper Oxalate Biomineral Moolooite: The First Single-Crystal X-ray Diffraction Studies and Thermal Behavior

Encapsulating magnetite nanopowder with fungal biomass: Investigating effects on chemical and mineralogical stability

Oxalate Crystallization under the Action of Brown Rot Fungi

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