Oxidative degradation of cylindrospermopsin and anatoxin-a by FeIII–B*/H2O2

Liu, Jishan; Greenwood, David R.; Kuntz, Lionel; Wright, L. James; Singhal, Naresh

doi:10.1039/d1ew00744k

Cited by 4 publications

(5 citation statements)

References 86 publications

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“…3). This is in accordance with previous studies of the MS2 fragmentation product for the epoxy-ANA molecular ion ([M + H] + , m/z 182) (Kaminski et al 2021;Liu et al 2022). The structure was also searched via the Mass Frontier™ software using its exact mass to ensure proper identi cation.…”

Section: Identi Cation and Toxicity Of Degradation Productssupporting

confidence: 93%

“…What is also noteworthy here in our study is that the degradation product, epoxy-ATX-a resulting from the biodegradation of ATX-a by strain AMRI-03, was not toxic to T. platyurus. Our results are thus in agreement with previous studies that epioxy-ATX-a is nontoxic (Kaminski et al 2021;Liu et al 2022;James et al 2005). Our results also showed that strain AMRI-03 which had highest homology with Bacillus subtilis (Alamri 2010), did not exhibited any toxicity to T. platyurus.…”

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confidence: 93%

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Degradation of the cyanobacterial toxin anatoxin-a by a Bacillus strain in batch culture

Mohamed

Mostafa

Alamri

et al. 2022

Preprint

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Anatoxin-a (ATX-a) is an alkaloid neurotoxin produced by certain species of cyanobacteria. It is water soluble and relatively stable in natural water, and thereby could present health hazards to human, animals and plants through prolonged exposure. Conventional water treatment methods are insufficient for ATX-a removal, and sometimes cause cell lysis and release on intracellular toxin. Biodegradation could be a promising method for removal of this toxin. This study addresses for the first time ATX-a biodegradation by Bacillus strain into a nontoxic byproduct (epioxy-ATX-a). The results showed that Bacillus strain AMRI-03 grew without lag phase in a lake water containing ATX-a.The strain also exhibited rapid ATX-a degradation, and the total degradation was initial- toxin-concentration–dependent.Total degradation of ATX-a occurred within 4 days at the highest two initial concentrations (50 & 100µg L− 1), compared to 6 and 7 days at lower concentrations (20, 10, and 1µg L− 1, respectively). Biodegradation rate by this bacterium also depended on initial ATX-a concentration, with highest value (12.5µg ATX L− 1 day− 1) recorded at the highest initial toxin concentrations (50 & 100µg L− 1). ATX-a biodegradation rate was influenced by temperature, with highest occurred at 25 and 30 ºC. pH also affected this rate, and the highest rates were obtained under neutral and slightly alkaline conditions (i.e., pH7 and 8). Both lower and higher pHs slowed the degradation rate. Being nontoxic, this bacterial strain could be applied in slow sand filters for degradation and removal of anatoxin-a in water treatment plants, after setting up mesocosm experiments to assess the potential effects of this bacterium on water quality.

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Section: Identi Cation and Toxicity Of Degradation Productssupporting

confidence: 93%

supporting

confidence: 93%

Degradation of the cyanobacterial toxin anatoxin-a by a Bacillus strain in batch culture

Mohamed

Mostafa

Alamri

et al. 2022

Preprint

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“…[ 33 , 58 , 61 ] For the removal of cyanotoxins from water, SR‐AOPs were mainly studied for the removal of ATX, MCs, and CYN, focusing on UV and catalyst activation as shown in Table 2 . [ 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 ]…”

Section: Removal Of Cyanotoxins From the Watermentioning

confidence: 99%

A Perspective on Removal of Cyanotoxins from Water Through Advanced Oxidation Processes

Verma,

Kumar,

Lavrenčič Štangar

2023

Global Challenges

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This perspective discusses the challenges associated with the removal of cyanotoxins from raw water sources for drinking water treatment and the emergence of sulfate radical‐based advanced oxidation processes (SR‐AOPs) as an effective treatment technique. The advantage of SR‐AOPs is that they can be activated using a variety of methods, including heat, UV radiation, and transition metal catalysts, allowing for greater flexibility in treatment design and optimization. In addition, the byproducts of SR‐AOPs are less harmful than those generated by •OH‐AOPs, which reduces the risk of secondary contamination. SR‐AOPs generate sulfate radicals (SO4•−) that are highly selective to certain organic contaminants and have lower reactivity to background water constituents, resulting in higher efficiency and selectivity of the process. The presence of natural organic matter and transition metals in the natural water body increases the degradation efficiency of SR‐AOPs for the cyanotoxins. The bromate formation is also suppressed when the water contaminated with cyanotoxins is treated with SR‐AOPs.

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“…Iron in different oxidation states ranging from 0 to +6 has tremendous potential in catalytic, synthetic, biological, and environmental reactions. − Zero-valent iron (Fe(0)) in the reduction of halogenated compounds has been investigated. , Iron(II) and iron(III) have applications in organic synthesis reactions . These low-valent iron in Fenton and Fenton-like reactions has been studied for many decades. − High-valent iron (iron(IV) and iron(V)) has been the subject of numerous studies due to its roles in biological oxidation reactions, activation of inert carbon–hydrogen bonds, and decontamination of water. − For example, iron(III) tetra-amidato macrocycle (Fe(III)-TAML) in a reaction with hypochlorite and hydrogen peroxide generates iron(IV) and iron(V) species to oxidize hydrocarbons and a wide range of pollutants. , High-valent iron with an oxidation state of +6 commonly existing as FeO 4 2– (Fe(VI)) in aqueous solution has been mainly studied in purifying water and wastewater. − …”

Section: Introductionmentioning

confidence: 99%

“… 12 − 15 For example, iron(III) tetra-amidato macrocycle (Fe(III)-TAML) in a reaction with hypochlorite and hydrogen peroxide generates iron(IV) and iron(V) species to oxidize hydrocarbons and a wide range of pollutants. 16 , 17 High-valent iron with an oxidation state of +6 commonly existing as FeO 4 2– (Fe(VI)) in aqueous solution has been mainly studied in purifying water and wastewater. 18 − 22 …”

Section: Introductionmentioning

confidence: 99%

Oxidation of Pharmaceuticals by Ferrate(VI)–Amino Acid Systems: Enhancement by Proline

et al. 2023

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The occurrence of micropollutants in water threatens public health and ecology. Removal of micropollutants such as pharmaceuticals by a green oxidant, ferrate(VI) (Fe VI O 4 2− , Fe(VI)) can be accomplished. However, electron-deficient pharmaceuticals, such as carbamazepine (CBZ) showed a low removal rate by Fe(VI). This work investigates the activation of Fe(VI) by adding nine amino acids (AA) of different functionalities to accelerate the removal of CBZ in water under mild alkaline conditions. Among the studied amino acids, proline, a cyclic AA, had the highest removal of CBZ. The accelerated effect of proline was ascribed by demonstrating the involvement of highly reactive intermediate Fe(V) species, generated by one-electron transfer by the reaction of Fe(VI) with proline (i.e., Fe(VI) + proline → Fe(V) + proline • ). The degradation kinetics of CBZ by a Fe(VI)−proline system was interpreted by kinetic modeling of the reactions involved that estimated the rate of the reaction of Fe(V) with CBZ as (1.03 ± 0.21) × 10 6 M −1 s −1 , which was several orders of magnitude greater than that of Fe(VI) of 2.25 M −1 s −1 . Overall, natural compounds such as amino acids may be applied to increase the removal efficiency of recalcitrant micropollutants by Fe(VI).

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Oxidative degradation of cylindrospermopsin and anatoxin-a by Fe^III–B*/H₂O₂

Abstract: Cylindrospermopsin (CYL) and anatoxin-a (ANA) are alkaloid-like potent cyanotoxins produced during cyanobacterial blooms.

Cited by 4 publications

References 86 publications

Degradation of the cyanobacterial toxin anatoxin-a by a Bacillus strain in batch culture

Degradation of the cyanobacterial toxin anatoxin-a by a Bacillus strain in batch culture

A Perspective on Removal of Cyanotoxins from Water Through Advanced Oxidation Processes

Oxidation of Pharmaceuticals by Ferrate(VI)–Amino Acid Systems: Enhancement by Proline

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