Zinc Oxalate Crystal Formation by<i>Aspergillus nomius</i>

Sutjaritvorakul, Thanawat; Gadd, Geoffrey M.; Whalley, Anthony J. S.; Suntornvongsagul, Kallaya; Sihanonth, Prakitsin

doi:10.1080/01490451.2015.1048395

Cited by 8 publications

(6 citation statements)

References 24 publications

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“…The XRD peaks recorded at 18.8°, 22.5°, 30.1°, 35.0°, and 40.5° 2θ were in agreement with those from previous XRD measurements of Zn-Ox dihdyrate (Fig. 3A) [8,27]. The XRD peaks of the crystals formed from Zn-Ca systems with Zn mole ratios less than 0.25 were attributable to Ca-Ox monohydrate (whewellite) or Ca-Ox dihydrate (weddellite) (Fig.…”

Section: Characterization Of Zn-ox and Ca-ox Precipitatessupporting

confidence: 90%

“…The Ca-Ox precipitate is relatively insoluble, with the monohydrate (whewellite), dihydrate (weddellite), and trihydrate reported to have solubility product constants of 1.45 x 10 -9 , 3.80 x 10 -9 , and 4.68 x 10 -9 , respectively [5]. Other insoluble oxalates of trace metals including Cd and Zn can also be formed naturally, for example, by soil fungi [6][7][8]. The solubility product constants of these trace metal oxalates can be above or below that of Ca-Ox, with values of 1.42 x 10 -8 for Cd-oxalate (Cd-Ox) trihydrate [9] and 1.38 x 10 -9 [9] for Zn-oxalate (Zn-Ox) dihydrate.…”

Section: Introductionmentioning

confidence: 99%

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Solubility, structure, and morphology in the co-precipitation of cadmium and zinc with calcium-oxalate

McBride

Frenchmeyer

Kelch

et al. 2017

Journal of Colloid and Interface Science

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Calcium-oxalates (Ca-Ox), which are widely produced by microorganisms and plants, are ubiquitous and persistent biominerals in the biosphere. We investigated the potential trapping of two phytotoxic metals, cadmium (Cd) and zinc (Zn) by isomorphous substitution into the crystalline structure of Ca-Ox precipitated over a wide range of Cd/Ca or Zn/Ca ratio in solution. We employed atomic absorption spectroscopy, X-ray diffraction (XRD), and optical microscopy to evaluate our hypotheses that favorable solid-solution conditions and structural framework of crystal habits promote selective metal trapping within Ca-Ox precipitates. Chemical analysis demonstrated more effective Cd-Ox/Ca-Ox than Zn-Ox/Ca-Ox co-precipitate formation at the same trace metal mole fraction in solution. The XRD results revealed sequestration of Cd, but not Zn, within Ca-Ox monohydrate (whewellite). Comparative chemical analysis with Cd-Ox formation in the absence of Ca-Ox showed that the whewellite solid-solution formation lowered the solubility of Cd below that of pure Cd-Ox. The XRD patterns indicated that Zn precipitated as a separate pure Zn-Ox crystal that is largely excluded from the Ca-Ox structure. Furthermore, the presence of Zn in solution favored the formation of the less stable Ca-Ox dihydrate (weddellite) over whewellite. In agreement with the XRD data, visualization of the co-precipitates by optical microscopy illustrated combined mineral phases of Cd-Ox with Ca-Ox whereas Zn-Ox and Ca-Ox exhibited two distinct mineral morphologies. Our findings shed light into the structural factors that are most critical in facilitating the trapping of toxic trace metals within Ca-Ox crystals.

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Section: Characterization Of Zn-ox and Ca-ox Precipitatessupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Solubility, structure, and morphology in the co-precipitation of cadmium and zinc with calcium-oxalate

McBride

Frenchmeyer

Kelch

et al. 2017

Journal of Colloid and Interface Science

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“…A change in Zn minerals into Zn oxalates had been observed before, albeit the minerals were not nanoparticles [ 32 , 39 , 45 ]. When silicate and sulfide minerals containing Zn were transformed by fungal extracellular metabolites, the resulting crystals of zinc oxalates had various shapes and sizes, with most of the crystals measuring between 50 and 100 µm [ 39 ].…”

Section: Discussionmentioning

confidence: 89%

“…Minerals of zinc oxalate associated with a fungus have a different shape compared to both biomineral and abiotically formed Zn oxalate. However, the biominerals formed farther away from the fungal mycelium had a shape that was more similar to the abiotically formed Zn oxalate [ 32 ]. Since our experiment was only done with extracellular metabolites, the smaller change in the size and shape upon partial transformation may also result from the same processes that led to the increase in similarities between the biomineral formed further away from the mycelium and the abiotically formed mineral.…”

Section: Discussionmentioning

confidence: 99%

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Fungus Aspergillus niger Processes Exogenous Zinc Nanoparticles into a Biogenic Oxalate Mineral

Šebesta

Urík

Bujdoš

et al. 2020

JoF

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Zinc oxide nanoparticles (ZnO NPs) belong to the most widely used nanoparticles in both commercial products and industrial applications. Hence, they are frequently released into the environment. Soil fungi can affect the mobilization of zinc from ZnO NPs in soils, and thus they can heavily influence the mobility and bioavailability of zinc there. Therefore, ubiquitous soil fungus Aspergillus niger was selected as a test organism to evaluate the fungal interaction with ZnO NPs. As anticipated, the A. niger strain significantly affected the stability of particulate forms of ZnO due to the acidification of its environment. The influence of ZnO NPs on fungus was compared to the aqueous Zn cations and to bulk ZnO as well. Bulk ZnO had the least effect on fungal growth, while the response of A. niger to ZnO NPs was comparable with ionic zinc. Our results have shown that soil fungus can efficiently bioaccumulate Zn that was bioextracted from ZnO. Furthermore, it influences Zn bioavailability to plants by ZnO NPs transformation to stable biogenic minerals. Hence, a newly formed biogenic mineral phase of zinc oxalate was identified after the experiment with A. niger strain’s extracellular metabolites highlighting the fungal significance in zinc biogeochemistry.

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Crystallization of Calcium Oxalate Hydrates by Interaction of Apatites and Fossilized Tooth Tissue with Fungus Aspergillus niger

Zelenskaya

Rusakov

Frank‐Kamenetskaya

et al. 2019

Lecture Notes in Earth System Sciences

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Zinc Oxalate Crystal Formation byAspergillus nomius

Cited by 8 publications

References 24 publications

Solubility, structure, and morphology in the co-precipitation of cadmium and zinc with calcium-oxalate

Solubility, structure, and morphology in the co-precipitation of cadmium and zinc with calcium-oxalate

Fungus Aspergillus niger Processes Exogenous Zinc Nanoparticles into a Biogenic Oxalate Mineral

Crystallization of Calcium Oxalate Hydrates by Interaction of Apatites and Fossilized Tooth Tissue with Fungus Aspergillus niger

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