Formation, characterisation and redox behaviour of water-soluble colloidal manganese dioxide

Zaheer, Zoya; Rafi-Ud-Din, .

doi:10.1080/17458080.2010.501965

Cited by 4 publications

(3 citation statements)

References 20 publications

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“…26 Furthermore, the Mn (+5) intermediates undergo hydrolysis for the formation of Mn (+4) species. 27 2.4. Characterization.…”

Section: Experiments Sectionmentioning

confidence: 99%

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Photophysical Study of Heteroatom-Doped Carbon Dots-MnO₂-Based Nanosensor: Selective Detection of Glutathione in the Nanomolar Level

Sohal,

Sharma,

Choudhury

et al. 2023

ACS Appl. Bio Mater.

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Heteroatom doping on carbon dots (Cdots) has been developed as an efficient approach to modify its optical and electronic properties. The four different types of heteroatom-doped Cdots (undoped Cdots (u-Cdots, nitrogen-doped Cdots (N-Cdots), sulfur-doped Cdots (Cdots), nitrogen, sulfur codoped Cdots (N, S-Cdots)) have been synthesized through a simple heat treatment of 5 min. Among four different heteroatoms doped nanosensors, N, S-Cdots with MnO2 nanospheres (Mn NS) showed one of the best fluorescents “on–off–on” nanosensors for selective sensing of glutathione (GSH) and cell imaging. N, S-Cdots showed a high fluorescence quantum yield, good photostability, ionic strength, and pH stability. N, S-Cdots with Mn NS demonstrated extremely high fluorescence quenching efficiency and the maximum fluorescence recovery rate after adding GSH to the produced solution. The photophysical study of N, S-Cdots-Mn NS used as a sensor confirms the inner filter effect (IFE) quenching mechanism between them. The developed sensor has an 80 nM limit of detection (LOD) for GSH. The heteroatom-doped framework of Cdots plays a significant role in the sensitive detection of GSH. N, S-Cdots-Mn NS have good permeability, biocompatibility, and low toxicity, due to which it was used in the intracellular imaging of GSH in living cells. The prepared sensor is rapid, economical, less toxic, and highly applicable in diagnosing diseases.

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“…26 Furthermore, the Mn (+5) intermediates undergo hydrolysis for the formation of Mn (+4) species. 27 2.4. Characterization.…”

Section: Experiments Sectionmentioning

confidence: 99%

“…The preparation of colloidal MnO 2 includes first the formation of Mn (+5) intermediate which is based on one-step two-electron oxidation–reduction that takes place between Mn (+7) and methionine . Furthermore, the Mn (+5) intermediates undergo hydrolysis for the formation of Mn (+4) species …”

Section: Experiments Sectionmentioning

confidence: 99%

Photophysical Study of Heteroatom-Doped Carbon Dots-MnO₂-Based Nanosensor: Selective Detection of Glutathione in the Nanomolar Level

Sohal,

Sharma,

Choudhury

et al. 2023

ACS Appl. Bio Mater.

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“…The reaction was very fast, and the change in the color from light pink to brown indicated the formation of MnO 2 nanospheres. The reaction was a one-step, two-electron redox reaction between methionine and Mn(VII) . Different-size MnO 2 nanospheres (large (L-Mn NS), medium (M-Mn NS) and small (S-Mn NS)) were synthesized by varying the concentration of l -methionine and keeping the concentration of KMnO 4 fixed (Table ).…”

Section: Materials and Reagentsmentioning

confidence: 99%

Carbon Dot–MnO₂ Nanosphere Composite Sensors for Selective Detection of Glutathione

Sohal

Maity

Basu

2020

ACS Appl. Nano Mater.

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Herein, a fluorescent nanosensor based on carbon dots (Cdots) and different-size MnO2 nanospheres has been synthesized for rapid detection of glutathione (GSH). Water-soluble and highly fluorescent Cdots were prepared by the microwave method using ascorbic acid as the precursor. MnO2 nanospheres of different sizes (large, medium, and small) were prepared by varying the concentration ratio of methionine and KMnO4 at room temperature, which was confirmed by HRTEM analysis. The different sizes of MnO2 nanospheres in Cdots result in quenching of the fluorescence intensity, quantum yields, and average lifetime values, which suggest that the fluorescence resonance energy transfer mechanism occurs between the Cdots and MnO2 nanospheres. The variations of all the photophysical parameters and fluorescence turn off properties of Cdots are significantly tuned depending on the size of the nanospheres. Moreover, detection of GSH in the presence of different-size Cdots@MnO2 systems has been explored. GSH causes the redox reaction in the presence of MnO2, which leads to transformation from MnO2 to Mn2+. As a result, fluorescence restoration (turn on) of Cdots was observed. The large MnO2 nanospheres showed the lowest detection limit of 15 μM for GSH. The synthesized sensing system was very fast, simple, economical, and environmentally-friendly for the detection of the GSH level.

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Physicochemical parameter influences and their optimization on the biosynthesis of MnO2 nanoparticles using Vernonia amygdalina leaf extract

Dessie

Tadesse

Eswaramoorthy

2020

Arabian Journal of Chemistry

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Formation, characterisation and redox behaviour of water-soluble colloidal manganese dioxide

Cited by 4 publications

References 20 publications

Photophysical Study of Heteroatom-Doped Carbon Dots-MnO₂-Based Nanosensor: Selective Detection of Glutathione in the Nanomolar Level

Photophysical Study of Heteroatom-Doped Carbon Dots-MnO₂-Based Nanosensor: Selective Detection of Glutathione in the Nanomolar Level

Carbon Dot–MnO₂ Nanosphere Composite Sensors for Selective Detection of Glutathione

Physicochemical parameter influences and their optimization on the biosynthesis of MnO2 nanoparticles using Vernonia amygdalina leaf extract

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Formation, characterisation and redox behaviour of water-soluble colloidal manganese dioxide

Cited by 4 publications

References 20 publications

Photophysical Study of Heteroatom-Doped Carbon Dots-MnO2-Based Nanosensor: Selective Detection of Glutathione in the Nanomolar Level

Photophysical Study of Heteroatom-Doped Carbon Dots-MnO2-Based Nanosensor: Selective Detection of Glutathione in the Nanomolar Level

Carbon Dot–MnO2 Nanosphere Composite Sensors for Selective Detection of Glutathione

Physicochemical parameter influences and their optimization on the biosynthesis of MnO2 nanoparticles using Vernonia amygdalina leaf extract

Contact Info

Product

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Photophysical Study of Heteroatom-Doped Carbon Dots-MnO₂-Based Nanosensor: Selective Detection of Glutathione in the Nanomolar Level

Photophysical Study of Heteroatom-Doped Carbon Dots-MnO₂-Based Nanosensor: Selective Detection of Glutathione in the Nanomolar Level

Carbon Dot–MnO₂ Nanosphere Composite Sensors for Selective Detection of Glutathione