Chelation of Iron and Copper by Quercetin B-Ring Methyl Metabolites, Isorhamnetin and Tamarixetin, and Their Effect on Metal-Based Fenton Chemistry

2021 ◽  
Author(s):  
Zuzana Lomozová ◽  
Maria Carmen Catapano ◽  
Marcel Hrubša ◽  
Jana Karlíčková ◽  
Kateřina Macáková ◽  
...  
Keyword(s):  
Fenton Chemistry ◽  
Chelation Of Iron

Nitrite enhanced copper-based Fenton reactions for biofilm removal

2021 ◽  
Author(s):  
Li Wang ◽  
Rui Peng ◽  
Xue Liu ◽  
Chendi Heng ◽  
Yanni Miao ◽  
...  
Keyword(s):  
Fenton Chemistry ◽  
Biofilm Removal ◽  
Removal Technology ◽  
Cu Ions

Unwanted biofilms present challenges for many industries. Herein an innovative biofilm removal technology was developed based on nitrite-accelerated Fenton chemistry, where both dissolved Cu ions and nano-CuO surfaces efficiently generate...

Sono‐Fenton Chemistry Converts Phenol‐ and Phenyl‐Derivatives into Polyphenols for Engineering Surface Coatings

2021 ◽  
Author(s):  
Hanxiao Mei ◽  
Zhiliang Gao ◽  
Kaijie Zhao ◽  
Mengqi Li ◽  
Muthupandian Ashokkumar ◽  
...  
Keyword(s):  
Surface Coatings ◽  
Fenton Chemistry

scholarly journals Secretion of Iron(III)-Reducing Metabolites during Protein Acquisition by the Ectomycorrhizal Fungus Paxillus involutus

2020 ◽  
Vol 9 (1) ◽  
pp. 35
Author(s):  
Firoz Shah ◽  
Markus Gressler ◽  
Susan Nehzati ◽  
Michiel Op De Beeck ◽  
Luigi Gentile ◽  
...  
Keyword(s):  
Fenton Reaction ◽  
Ectomycorrhizal Fungus ◽  
Paxillus Involutus ◽  
Environmental Cues ◽  
Rapid Reduction ◽  
Fenton Chemistry ◽  
X Ray ◽  
Solid Iron ◽  
X Ray Absorption ◽  
Step Mechanism

The ectomycorrhizal fungus Paxillus involutus decomposes proteins using a two-step mechanism, including oxidation and proteolysis. Oxidation involves the action of extracellular hydroxyl radicals (•OH) generated by the Fenton reaction. This reaction requires the presence of iron(II). Here, we monitored the speciation of extracellular iron and the secretion of iron(III)-reducing metabolites during the decomposition of proteins by P. involutus. X-ray absorption spectroscopy showed that extracellular iron was mainly present as solid iron(III) phosphates and oxides. Within 1 to 2 days, these compounds were reductively dissolved, and iron(II) complexes were formed, which remained in the medium throughout the incubation. HPLC and mass spectrometry detected five extracellular iron(III)-reducing metabolites. Four of them were also secreted when the fungus grew on a medium containing ammonium as the sole nitrogen source. NMR identified the unique iron(III)-reductant as the diarylcyclopentenone involutin. Involutin was produced from day 2, just before the elevated •OH production, preceding the oxidation of BSA. The other, not yet fully characterized iron(III)-reductants likely participate in the rapid reduction and dissolution of solid iron(III) complexes observed on day one. The production of these metabolites is induced by other environmental cues than for involutin, suggesting that they play a role beyond the Fenton chemistry associated with protein oxidation.

scholarly journals Analysis of yggX and gshA Mutants Provides Insights into the Labile Iron Pool in Salmonella enterica

2008 ◽  
Vol 190 (23) ◽  
pp. 7608-7613 ◽  
Author(s):  
Michael P. Thorgersen ◽  
Diana M. Downs
Keyword(s):  
Salmonella Enterica ◽  
Iron Chelator ◽  
Fenton Chemistry ◽  
Labile Iron Pool ◽  
Growth Defects ◽  
Labile Iron ◽  
Iron Pool ◽  
Mutant Phenotypes ◽  
Permeable Iron ◽  
Iron Chelator Deferoxamine

ABSTRACT Strains of Salmonella enterica lacking YggX and the cellular reductant glutathione exhibit defects similar to those resulting from iron deficiency and oxidative stress. Mutant strains are sensitive to hydrogen peroxide and superoxide, deregulate the expression of the Fur-regulated gene entB, and fail to grow on succinate medium. Suppression of some yggX gshA mutant phenotypes by the cell-permeable iron chelator deferoxamine allowed the conclusion that increased levels of cellular Fenton chemistry played a role in the growth defects. The data presented are consistent with a scenario in which glutathione acts as a physiological chelator of the labile iron pool and in which YggX acts upstream of the labile iron pool by preventing superoxide toxicity.

Derivatization and interlaminar debonding of graphite–iron nanoparticle hybrid interfaces using Fenton chemistry

2017 ◽  
Vol 19 (25) ◽  
pp. 16329-16336 ◽  
Author(s):  
Neha Agarwal ◽  
Ruma Bhattacharyya ◽  
Narendra K. Tripathi ◽  
Sanjay Kanojia ◽  
Debmalya Roy ◽  
...  
Keyword(s):  
Interfacial Debonding ◽  
Fenton Chemistry ◽  
Iron Nanoparticle ◽  
Physico Chemical ◽  
Graphite Sheets

Physico-chemical phenomena endure in the nanoscale domains of organic–inorganic interfaces for exfoliation, interfacial debonding and cracking of the graphite sheets.

scholarly journals Fenton‐Chemistry‐Mediated Radical Polymerization

2019 ◽  
Vol 40 (18) ◽  
pp. 1900220 ◽  
Author(s):  
Amin Reyhani ◽  
Thomas G. McKenzie ◽  
Qiang Fu ◽  
Greg G. Qiao
Keyword(s):  
Radical Polymerization ◽  
Fenton Chemistry
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