The Oxidation of Organic Compounds by Active Manganese Dioxide

Fatiadi, Alexander J.

doi:10.1007/978-1-4613-2109-5_3

Cited by 29 publications

(11 citation statements)

References 575 publications

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“…As we could not detect cavities, carbon‐rich rounded features, or any forms which could indicate former biological material (Supporting Information Figs. S7 and S8), it may also be that oxidants such as Mn oxides oxidized the organic material (Fatiadi, ), followed by baking of the oxidized organics under high radiation conditions and blistering heat. During preparation for microscopy and spectroscopy analysis (grinding and polishing under wet conditions, generating high temperatures; see Supporting Information), the upper layer might be degraded, thus explaining why organic carbon could not be detected in these analyses.…”

Section: Resultsmentioning

confidence: 99%

“…The 30 most abundant protein-encoding genes with a positive or negative log2(fold change) > 1 and selected categories of interest (detailed in Supporting Information Table S8) are shown. (Fatiadi, 1986), followed by baking of the oxidized organics under high radiation conditions and blistering heat. During preparation for microscopy and spectroscopy analysis (grinding and polishing under wet conditions, generating high temperatures; see Supporting Information), the upper layer might be degraded, thus explaining why organic carbon could not be detected in these analyses.…”

Section: Resultsmentioning

confidence: 99%

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Insights into microbial involvement in desert varnish formation retrieved from metagenomic analysis

Lang‐Yona

Maier

Macholdt

et al. 2018

Environ Microbiol Rep

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Desert varnishes are dark rock coatings observed in arid environments and might resemble Mn-rich coatings found on Martian rocks. Their formation mechanism is not fully understood and the possible microbial involvement is under debate. In this study, we applied DNA metagenomic Shotgun sequencing of varnish and surrounding soil to evaluate the composition of the microbial community and its potential metabolic function. We found that the α diversity was lower in varnish compared to soil samples (p value < 0.05), suggesting distinct populations with significantly higher abundance of Actinobacteria, Proteobacteria and Cyanobacteria within the varnish. Additionally, we observed increased levels of transition metal metabolic processes in varnish compared to soil samples. Nevertheless, potentially relevant enzymes for varnish formation were detected at low to insignificant levels in both niches, indicating no current direct microbial involvement in Mn oxidation. This finding is supported by quantitative genomic analysis, elemental analysis, fluorescence imaging and scanning transmission X-ray microscopy. We thus conclude that the distinct microbial communities detected in desert varnish originate from settled Aeolian microbes, which colonized this nutrient-enriched niche, and discuss possible indirect contributions of microorganisms to the formation of desert varnish.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Insights into microbial involvement in desert varnish formation retrieved from metagenomic analysis

Lang‐Yona

Maier

Macholdt

et al. 2018

Environ Microbiol Rep

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“…Manganese dioxide (MnO2) is one of the most important oxidizing agent for both organic and inorganic compounds [1,2] with an oxidation potential of 1.23 V [3]. Due to its importance such as the low toxicity, low cost, electrochemical behavior, environmental compatibility and ease of handling, many researchers have been developed different methods for preparation of soluble colloidal MnO2 [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Soluble Colloidal Manganese Dioxide: Formation, Characterization and Application in Oxidative Kinetic Study of Ciprofloxacin

Tazwar¹,

Devra²

2019

Bull. Chem. React. Eng. Catal.

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Soluble colloidal manganese dioxide was formed by reduction of potassium permanganate with sodium thiosulphate in neutral aqueous medium at 25 ºC. The obtained nano-sized colloidal manganese dioxide was found to be dark reddish-brown in color and stable for several months. The formation of manganese dioxide was confirmed by UV-visible spectrophotometer and determination of oxidation state of Mn species in manganese dioxide. The effect of different concentration of sodium thiosulphate on the formation of manganese dioxide was also studied. The nano-sized colloid manganese dioxide was characterized by transmission electron microscopy and Fourier transform infrared spectrophotometer. The formed soluble colloidal manganese dioxide was used as an oxidant in oxidation of ciprofloxacin in perchloric acid medium at 35 ºC. The reaction was first-order concerning to concentration of manganese dioxide and hydrogen ion but fractional order with ciprofloxacin. The results suggest formation of complex between ciprofloxacin and manganese dioxide. The oxidation products were also identified based on stoichiometric and characterization results. Copyright © 2020 BCREC Group. All rights reserved

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“…It is well established that manganese dioxide acts as an oxidizing agent for both organic [1] and inorganic compounds [2,3], but, due to solubility problem under normal conditions, its use is limited [4]. Active forms of manganese dioxide have earlier been obtained by redox reaction of permanganate with hydrogen peroxide [5] and manganese(II) ion [6].…”

Section: Introductionmentioning

confidence: 99%

Oxidation of lactic acid by water soluble (colloidal) manganese dioxide

Khan

Raju

Akram

et al. 2004

Int J of Chemical Kinetics

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Spectrophotometric method has been used to characterize water-soluble colloidal manganese dioxide obtained by the redox reaction between sodium thiosulphate and potassium permanganate in neutral aqueous medium which shows a single peak in the visible region with λ max = 425 nm. The kinetics of the oxidation of lactic acid by colloidal manganese dioxide (oxidant) has been investigated spectrophotometrically under pseudo-first-order conditions of excess lactic acid. The rate of the noncatalytic reaction pathway was slow which increased with increasing lactic acid concentration. The reaction was first-order with respect to [oxidant] as well as [lactic acid]. In presence of manganase(II) and fluoride ions, the noncatalytic path disappeared completely while the oxidation rate of autocatalytic path increased and decreased, respectively with increasing [Mn(II)] and [F − ]. A mechanistic scheme in conformity with the observed kinetics has been proposed with the rate-law:

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The Oxidation of Organic Compounds by Active Manganese Dioxide

Cited by 29 publications

References 575 publications

Insights into microbial involvement in desert varnish formation retrieved from metagenomic analysis

Insights into microbial involvement in desert varnish formation retrieved from metagenomic analysis

Soluble Colloidal Manganese Dioxide: Formation, Characterization and Application in Oxidative Kinetic Study of Ciprofloxacin

Oxidation of lactic acid by water soluble (colloidal) manganese dioxide

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