Calmagite dye oxidation using in situ generated hydrogen peroxide catalysed by manganese(ii) ions

Sheriff, Tippu S.; Cope, Steven; Ekwegh, Mmaezi

doi:10.1039/b711143f

Cited by 17 publications

(13 citation statements)

References 17 publications

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“…The H 2 O 2 generation assays demonstrated a requirement for manganese, iron and nickel ions. Of these ions, manganese alone was sufficient to generate H 2 O 2 by VSMCs (data not shown), which is consistent with reports that manganese catalyzes H 2 O 2 from dioxygen [72]. Furthermore, manganese chloride can induce the release of H 2 O 2 from microglial cells [14].…”

Section: Discussionsupporting

confidence: 78%

Stainless Steel Ions Stimulate Increased Thrombospondin-1-Dependent TGF-Beta Activation by Vascular Smooth Muscle Cells: Implications for In-Stent Restenosis

Pallero

Roden²,

Chen³

et al. 2009

J Vasc Res

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Background/Aims: Despite advances in stent design, in-stent restenosis (ISR) remains a significant clinical problem. All implant metals exhibit corrosion, which results in release of metal ions. Stainless steel (SS), a metal alloy widely used in stents, releases ions to the vessel wall and induces reactive oxygen species, inflammation and fibroproliferative responses. The molecular mechanisms are unknown. TGF-β is known to be involved in the fibroproliferative responses of vascular smooth muscle cells (VSMCs) in restenosis, and TGF-β antagonists attenuate ISR. We hypothesized that SS ions induce the latent TGF-β activator, thrombospondin-1 (TSP1), through altered oxidative signaling to stimulate increased TGF-β activation and VSMC phenotype change. Methods: VSMCs were treated with SS metal ion cocktails, and morphology, TSP1, extracellular matrix production, desmin and TGF-β activity were assessed by immunoblotting. Results: SS ions stimulate the synthetic phenotype, increased TGF-β activity, TSP1, increased extracellular matrix and downregulation of desmin in VSMCs. Furthermore, SS ions increase hydrogen peroxide and decrease cGMP-dependent protein kinase (PKG) signaling, a known repressor of TSP1 transcription. Catalase blocks SS ion attenuation of PKG signaling and increased TSP1 expression. Conclusions: These data suggest that ions from stent alloy corrosion contribute to ISR through stimulation of TSP1-dependent TGF-β activation.

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Section: Discussionsupporting

confidence: 78%

Stainless Steel Ions Stimulate Increased Thrombospondin-1-Dependent TGF-Beta Activation by Vascular Smooth Muscle Cells: Implications for In-Stent Restenosis

Pallero

Roden²,

Chen³

et al. 2009

J Vasc Res

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show abstract

“…In some cases, the application of in situ generated H 2 O 2 has been found to be potentially safer and more economical than bulk commercial H 2 O 2 [3][4][5]. Few reports have been published on the use of in situ generated H 2 O 2 for wastewater treatment, specifically for the oxidation of organic pollutants [6,7]. H 2 O 2 generation directly from H 2 and O 2 using a metal-supported catalyst has been widely studied [8].…”

Section: Introductionmentioning

confidence: 98%

“…It has been mentioned that without the initial neutralization of the medium, no H 2 O 2 was formed. In situ generated H 2 O 2 from HA and O 2 has been applied in the oxidation of Calmagite dye [7]. We have reported a simple, clean and environmentally friendly method for the generation of H 2 O 2 via FA and O 2 [12].…”

Section: Introductionmentioning

confidence: 98%

Hydrogen substitutes for the in situ generation of H2O2: An application in the Fenton reaction

Yalfani

Contreras

Medina

et al. 2011

Journal of Hazardous Materials

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“…However, reaction parameters, type and excessive quantity of the iron salt used, high cost of H 2 O 2 and high chemicals requirement for pH modulation of real textile wastewater, are factors that hamper application of the Fenton process in textile wastewater treatment . Moreover, safety issues associated with the transport and handling of bulk quantities of commercially available H 2 O 2 and the energy intensive nature of the anthraquinone process make the process hazardous and uneconomical . This highlights the need to develop an in situ Fenton process, which is possible by in situ production of H 2 O 2 /HO • using AOPs.…”

Section: Introductionmentioning

confidence: 99%

Recent advances, challenges and prospects of in situ production of hydrogen peroxide for textile wastewater treatment in microbial fuel cells

Asghar

Raman

Daud

2014

J of Chemical Tech & Biotech

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Application of the Fenton process for textile wastewater treatment is limited due to high treatment cost, substantially contributed by the un‐availability of cheap hydrogen peroxide. Therefore, alternative methods for hydrogen peroxide production are in demand. One such option is in situ hydrogen peroxide production using a wastewater based microbial fuel cell (WBMFC). However, not much have been published regarding in situ production of hydrogen peroxide for textile wastewater treatment in a WBMFC. Therefore, in this work the concept, advantages, challenges and prospects of using WBMFC to treat textile wastewater by simultaneously producing hydrogen peroxide (hence in situ hydrogen peroxide) and power are reviewed. The concept of WBMFC is the reduction of oxygen in the presence of electrons and protons from the anode chamber to produce hydrogen peroxide with simultaneous power production. This review confirms that use of dual chambers, proton exchange membrane, domestic or municipal wastewater/Geobacter Sulfurreducens or Shewanella species, pure graphite cathode, ammonia and heat treated carbon‐based anode can treat most textile wastewaters. However, single chamber WBMFCs can be used as a low power source for an electro‐Fenton reactor. Power produced can be used to provide energy for aeration required in the WBMFC, thus providing an integrated and sustainable solution for textile wastewater treatment. © 2014 Society of Chemical Industry

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Calmagite dye oxidation using in situ generated hydrogen peroxide catalysed by manganese(ii) ions

Cited by 17 publications

References 17 publications

Stainless Steel Ions Stimulate Increased Thrombospondin-1-Dependent TGF-Beta Activation by Vascular Smooth Muscle Cells: Implications for In-Stent Restenosis

Stainless Steel Ions Stimulate Increased Thrombospondin-1-Dependent TGF-Beta Activation by Vascular Smooth Muscle Cells: Implications for In-Stent Restenosis

Hydrogen substitutes for the in situ generation of H2O2: An application in the Fenton reaction

Recent advances, challenges and prospects of in situ production of hydrogen peroxide for textile wastewater treatment in microbial fuel cells

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