A comprehensive heterogeneous electron transfer rate constant evaluation of dissolved oxygen in DMSO at glassy carbon electrode measured by different electrochemical methods

Muhammad, Haji; Tahiri, Iftikhar Ahmad; Muhammad, Mehboob; Masood, Zaheer; Versiani, Muhammad Ali; Khaliq, Obaid; Latif, Muhammad; Hanif, Muddasir

doi:10.1016/j.jelechem.2016.05.049

Cited by 78 publications

(55 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…10 −5 cm 2 s −1 ; Figure S7–S18). The Nicholson method was used to determine the heterogeneous electron‐transfer rate constants at approximately10 −2 cm s −1 . These values are summarized in Table S1.…”

Section: Resultsmentioning

confidence: 99%

“…The Nicholson method wasu sed to determinet he heterogeneouse lectron-transfer rate constants at approximately10 À2 cm s À1 . [30][31][32] These values are summarized in Ta ble S1. As discussed above, PM567 acts as ap recursor to am ixture of active species that form the oxidized and reduced dye.B ecause these are not isolable species, similar experiments to determine their diffusion coefficients and electron-transfer rate constantscannotbep erformed.…”

Section: Diffusioncoefficients and Heterogeneous Electron-transfer Ramentioning

confidence: 99%

See 1 more Smart Citation

Characterization of a BODIPY Dye as an Active Species for Redox Flow Batteries

2016

View full text Add to dashboard Cite

An all-organic redox flow battery (RFB) employing a fluorescent boron-dipyrromethene (BODIPY) dye (PM567) was investigated. In a RFB, the stability of the electrolyte in all charged states is critically linked to coulombic efficiency. To evaluate stability, bulk electrolysis and cyclic voltammetry (CV) experiments were performed. Oxidized and reduced, PM567 does not remain intact; however, the products of bulk electrolysis evolve over time to show stable redox behavior, making the dye a precursor for the active species of an RFB. A theoretical cell potential of 2.32 V was predicted from CV experiments with a working discharge voltage of approximately 1.6 V in a static test cell. Mass spectrometry was used to identify the products of bulk electrolysis. Related experiments were carried out using ferrocene and cobaltocenium hexafluorophosphate as redox-stable benchmarks to further explain the stability results. The coulombic efficiency of a model cell using PM567 as a precursor for charge carriers stabilized around 73 %.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Diffusioncoefficients and Heterogeneous Electron-transfer Ramentioning

confidence: 99%

Characterization of a BODIPY Dye as an Active Species for Redox Flow Batteries

2016

View full text Add to dashboard Cite

show abstract

“…At this potential, the anode had the highest microbial activity and can effectively oxidize the organic matter for extracellular electron transfer [19,23]. At the same time, the potential also indicated that the dissolved oxygen in the medium environment near the anode had been exhausted [24].…”

Section: Start and Run Of Ree-electrode Biological Catalyticmentioning

confidence: 89%

Electrochemical Corrosion Prevention in Oilfield Wastewater for Effective Dissolved Oxygen Removal Using a Novel Upflow Bioelectrochemical System

Wu¹

2019

Journal of Chemistry

View full text Add to dashboard Cite

Towards the corrosion issues of oilfield wastewater for water recycling, the dissolved oxygen (DO) is a subsequent corrosive factor after the air desulfurization tower for high-efficiency removal of sulfides. However, an in situ biological technology for efficient DO removal has not been well developed by using organics in oilfield wastewater. A novel upflow bioelectrocatalytic system assembled with three electrodes (cathode-anode-cathode) was designed in this study, in which waste organic matter of oil wastewater was degraded by a bioanode for electron production and dissolved oxygen was efficiently reduced by a biocathode under an assistant external voltage. The results showed that the average current was kept over 6 mA by applying a fixed voltage of 0.8 V to treat oil wastewater with DO as high as 3–5 mg/L. The bottom cathode contributed the largest to DO removal rate, reaching 67%; contribution of the middle anode and the upper cathode for DO removal was 11% and 9%, respectively. The whole DO removal rate by the bioelectrocatalytic system was up to about 90%, and the effluent DO was reduced to below 0.6 mg/L by removing 40–50% COD.

show abstract

“…To assess the antioxidant capacity of the target compounds, CV was performed in 0.1 M tetrabutylammonium perchlorate in DMSO. [ 27 ] CV was first carried out at 25 mV/s scan rate without any sample or blank solution (0.1 M tetrabutylammonium perchlorate in DMSO) to produce the superoxide. Aliquots (μL) of samples (4 mg/mL) were then added to DMSO and CV measurements were recorded together with the response of anodic and cathodic peaks.…”

Section: Methodsmentioning

confidence: 99%

Superoxide scavenging and antiglycation activity of rhinacanthins-rich extract obtained from the leaves of Rhinacanthus nasutus

Shah¹,

Muhammad²,

Mehmood³

et al. 2017

Phcog Mag

Self Cite

View full text Add to dashboard Cite

Background:Oxidative stress and nonenzymatic protein glycation lead to serious diabetic complications that increase the risk of mortality. Rhinacanthus nasutus leaf crude extracts are previously reported for their antidiabetic, antiglycation, and antioxidant potential.Objective:The present study was performed to prepare a standardized rhinacanthins-rich extract (RRE) and evaluate its superoxide scavenging and antiglycation effects as compared to its marker compounds, namely, rhinacanthin-C (RC), rhinacanthin-D (RD), and rhinacanthin-N (RN).Materials and Methods:RRE was obtained by microwave-assisted green extraction along with a simple step of fractionation using Amberlite® column. RC, RD, and RN were isolated from the RRE using silica gel column chromatography. Superoxide scavenging activity was performed by cyclic voltammetry, and fructose-mediated human serum albumin glycation model was used for antiglycation activity. In silico studies were conducted to identify the structure-activity relationships of rhinacanthins.Results:On the basis of kinetic measurements, RRE exhibited the most potent antioxidant activity via ErCi mechanism, with a 50% inhibitory concentration (IC50) value of 8.0 μg/mL, antioxidant capacity of 39439 M−1, and binding constant of 45709 M−1. Antiglycation assay showed that RRE exhibited almost equivalent glycation inhibitory effect to that of RC, with IC50 values of 39.7 and 37.3 μg/mL, respectively, but higher than that of RD (IC50 of 50.4 μg/mL), RN (IC50 of 89.5 μg/mL), as well as the positive control, rutin (IC50 of 41.5 μg/mL).Conclusions:The potent superoxide scavenging and albumin glycation inhibitory effect of RRE rationalized its therapeutic application in various chronic diseases, especially in the complications of diabetes.SUMMARY Rhinacanthins-rich extract (RRE) exhibited potent superoxide scavenging activityRRE and rhinacanthin-C showed remarkable and comparable antiglycation effectRhinacanthins exhibited antiglycation activity by masking specific residues of albumin. Abbreviations used: RRE: Rhinacanthins-rich extract; RC: Rhinacanthin-C; RD: Rhinacanthin-D; RN: Rhinacanthin-N; IC50: 50% inhibitory concentration; Kao: Antioxidant activity coefficient; Kb: Binding constant; ErCi: Reversible electron transfer followed by an irreversible chemical reaction; DM: Diabetes mellitus; AGEPs: Advanced glycation end products; NMR: Nuclear magnetic resonance; HPLC: High-performance liquid chromatography; CV: Cyclic voltammetry; DMSO: Dimethyl sulfoxide; Ipa: Anodic peak current; Ipc: Cathodic peak current; HSA: Human serum albumin; MOE: Molecular operating environment; PASSonline: Online prediction of activity spectra for substances.

show abstract

A comprehensive heterogeneous electron transfer rate constant evaluation of dissolved oxygen in DMSO at glassy carbon electrode measured by different electrochemical methods

Cited by 78 publications

References 17 publications

Characterization of a BODIPY Dye as an Active Species for Redox Flow Batteries

Characterization of a BODIPY Dye as an Active Species for Redox Flow Batteries

Electrochemical Corrosion Prevention in Oilfield Wastewater for Effective Dissolved Oxygen Removal Using a Novel Upflow Bioelectrochemical System

Superoxide scavenging and antiglycation activity of rhinacanthins-rich extract obtained from the leaves of Rhinacanthus nasutus

Contact Info

Product

Resources

About