Catalytic Generation of Chlorine Dioxide from Chlorite Using a Water-Soluble Manganese Porphyrin

2010 ◽  
Vol 123 (3) ◽  
pp. 721-724 ◽  
Author(s):  
Thomas P. Umile ◽  
John T. Groves
Keyword(s):  
Chlorine Dioxide ◽  
Water Soluble ◽  
Manganese Porphyrin

Chlorite Dismutation to Chlorine Dioxide Catalyzed by a Water-Soluble Manganese Porphyrin

2010 ◽  
Vol 50 (3) ◽  
pp. 699-702 ◽  
Author(s):  
Scott D. Hicks ◽  
Jennifer L. Petersen ◽  
Curt J. Bougher ◽  
Mahdi M. Abu-Omar
Keyword(s):  
Chlorine Dioxide ◽  
Water Soluble ◽  
Manganese Porphyrin

Mechanistic study of a manganese porphyrin catalyst for on-demand production of chlorine dioxide in water

2015 ◽  
Vol 19 (01-03) ◽  
pp. 492-499 ◽  
Author(s):  
Scott D. Hicks ◽  
Silei Xiong ◽  
Curt J. Bougher ◽  
Grigori A. Medvedev ◽  
James Caruthers ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Chlorine Dioxide ◽  
Transfer Reaction ◽  
Water Soluble ◽  
Reaction Pathways ◽  
Mechanistic Study ◽  
Manganese Porphyrin ◽  
Oxygen Atom Transfer ◽  
On Demand ◽  
Proton Coupled Electron Transfer

A water-soluble manganese porphyrin complex was examined for the catalytic formation of chlorine dioxide from chlorite under ambient temperature at pH 5.00 and 6.90. Quantitative kinetic modeling allowed for the deduction of a mechanism that accounts for all experimental observations. Catalysis is initiated via an OAT (Oxygen Atom Transfer) reaction resulting in formation of a putative manganese(V) oxo species, which undergoes ET (Electron Transfer) with chlorite to form chlorine dioxide. As chlorine dioxide accumulates in solution, chlorite consumption slows down and ClO 2 reaches a maximum as the system reaches equilibrium. In phosphate buffer at pH 6.90, manganese(IV) oxo accumulates and its reaction with ClO 2 gives ClO 3-. However, at pH 5.00 acetate buffer proton coupled electron transfer (PCET) from chlorite to manganese(IV) oxo is fast and irreversible leading to chlorate formation only via the putative manganese(V) oxo species. These differences underscore how PCET rates affect reaction pathways and mechanism. The ClO 2 product can be collected from the aqueous reaction mixture via purging with an inert gas, allowing for the preparation of chlorine dioxide on-demand.

Chlorite Dismutation to Chlorine Dioxide Catalyzed by a Water-Soluble Manganese Porphyrin

2010 ◽  
Vol 123 (3) ◽  
pp. 725-728 ◽  
Author(s):  
Scott D. Hicks ◽  
Jennifer L. Petersen ◽  
Curt J. Bougher ◽  
Mahdi M. Abu-Omar
Keyword(s):  
Chlorine Dioxide ◽  
Water Soluble ◽  
Manganese Porphyrin

Potassium monopersulfate and a water-soluble manganese porphyrin complex, [Mn(TMPyP)](OAc)5, as an efficient reagent for the oxidative cleavage of DNA

Biochemistry ◽  
1989 ◽  
Vol 28 (18) ◽  
pp. 7268-7275 ◽  
Author(s):  
Jean Bernadou ◽  
Genevieve Pratviel ◽  
Faiza Bennis ◽  
Marc Girardet ◽  
Bernard Meunier
Keyword(s):  
Oxidative Cleavage ◽  
Water Soluble ◽  
Manganese Porphyrin ◽  
Porphyrin Complex ◽  
Efficient Reagent

scholarly journals Comparative study of hyperpure chlorine dioxide with two other irrigants regarding the viability of periodontal ligament stem cells

2020 ◽  
Author(s):  
Orsolya Láng ◽  
Krisztina S. Nagy ◽  
Julia Láng ◽  
Katalin Perczel-Kovách ◽  
Anna Herczegh ◽  
...  
Keyword(s):  
Stem Cells ◽  
Stem Cell ◽  
Cell Viability ◽  
Chlorine Dioxide ◽  
Periodontal Ligament ◽  
Water Soluble ◽  
Tetrazolium Salt ◽  
Stem Cell Markers ◽  
Periodontal Ligament Stem Cells ◽  
Cell Markers

Abstract Objectives Periodontal ligament stem cells (PDLSCs) have an underlined significance as their high proliferative capacity and multipotent differentiation provide an important therapeutic potential. The integrity of these cells is frequently disturbed by the routinely used irrigative compounds applied as periodontal or endodontic disinfectants (e.g., hydrogen peroxide (H2O2) and chlorhexidine (CHX)). Our objectives were (i) to monitor the cytotoxic effect of a novel dental irrigative compound, chlorine dioxide (ClO2), compared to two traditional agents (H2O2, CHX) on PDLSCs and (ii) to test whether the aging factor of PDLSC cultures determines cellular responsiveness to the chemicals tested. Methods Impedimetry (concentration-response study), WST-1 assays (WST = water soluble tetrazolium salt), and morphology analysis were performed to measure changes in cell viability induced by the 3 disinfectants; immunocytochemistry of stem cell markers (STRO-1, CD90, and CD105) measured the induced mesenchymal characteristics. Results Cell viability experiments demonstrated that the application of ClO2 does not lead to a significant decrease in viability of PLDSCs in concentrations used to kill microbes. On the contrary, traditional irrigants, H2O2, and CHX are highly toxic on PDLSCs. Aging of PLDSC cultures (passages 3 vs. 7) has characteristic effects on their responsiveness to these agents as the increased expression of mesenchymal stem cell markers turns to decreased. Conclusions and clinical relevance While the active ingredients of mouthwash (H2O2, CHX) applied in endodontic or periodontitis management have a serious toxic effect on PDLSCs, the novel hyperpure ClO2 is less toxic providing an environment favoring dental structure regenerations during disinfectant interventions.

Efficient Oxidative Degradation of Azo Dyes by a Water-Soluble Manganese Porphyrin Catalyst

ChemCatChem ◽  
2013 ◽  
Vol 5 (3) ◽  
pp. 796-805 ◽  
Author(s):  
Tapan Kumar Saha ◽  
Holm Frauendorf ◽  
Michael John ◽  
Sebastian Dechert ◽  
Franc Meyer
Keyword(s):  
Azo Dyes ◽  
Oxidative Degradation ◽  
Water Soluble ◽  
Manganese Porphyrin
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