Sulfur vacancy promoted peroxidase-like activity of magnetic greigite (Fe3S4) for colorimetric detection of serum glucose

Liu, Wei; Tian, Jinrong; Mao, Chengliang; Wang, Zhenfeng; Liu, Jia; Dahlgren, Randy A.; Zhang, Lizhi; Wang, Xuedong

doi:10.1016/j.aca.2020.06.056

Cited by 64 publications

(31 citation statements)

References 42 publications

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“…The morphology of Fe 3 S 4 , characterized by scanning electron microscopy (SEM) and transmission electron microscope (TEM), exhibited a sheet-like character with a thickness of~10 nm for both samples, and a distinct bending in the SV-rich Fe 3 S 4 structure (Figure S2). These characterization results were consistent with our previous work [37].…”

Section: Characterization Of S-vacancy Fe 3 Ssupporting

confidence: 94%

“…Sulfur-vacancy (SV) Fe 3 S 4 nanosheets were synthesized using a one-step solvothermal method [31,37]. In the SV-rich Fe 3 S 4 synthesis process, 0.834 g FeSO 4 Á7H 2 O was dissolved in 30 mL of ethylene glycol (EG) to form solution I, and 0.363 g L-cysteine was dissolved in 30 mL of EG to form solution II.…”

Section: Sample Preparationmentioning

confidence: 99%

“…In contrast, Å OH production for SV-poor Fe 3 S 4 was below the detection limit (0.59 lM) of the high performance liquid chromatography (HPLC) method revealing the importance of sulfur vacancies in promoting Å OH production under oxic conditions. The Brunauer Emmett-Teller (BET) surface areas were calculated to be 20.0 and 17.7 m 2 /g, for the SV-rich Fe 3 S 4 and SV-poor Fe 3 S 4 , respectively, which were corresponded to the average pore volumes of 10.1 and 10.8 nm [37]. These slight differences of BET surface areas and average pore volumes between the SV-poor Fe 3 S 4 and SVrich Fe 3 S 4 ruled out the specific contributions of surface area and pore volume to the Å OH formation efficiency.…”

Section: å Oh Production With Sv-fe 3 Smentioning

confidence: 99%

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Mechanisms for hydroxyl radical production and arsenic removal in sulfur-vacancy greigite (Fe3S4)

Liu

Zhou

et al. 2022

Journal of Colloid and Interface Science

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Herein, we systematically investigated the mechanisms of Å OH production and arsenic (As(III)) oxidation induced by sulfur vacancy greigite (Fe 3 S 4 ) under anoxic and oxic conditions. Reactive oxygen species analyses revealed that sulfur vacancy-rich Fe 3 S 4 (SV-rich Fe 3 S 4 ) activated molecular oxygen to produce hydrogen peroxide (H 2 O 2 ) via a two-electron reduction pathway under oxic conditions. Subsequently, H 2 O 2 was decomposed to Å OH via the Fenton reaction. Additionally, H 2 O was directly oxidized to Å OH by surface high-valent iron (Fe(IV)) resulting from the abundance of sulfur vacancies in Fe 3 S 4 under anoxic/oxic conditions. These differential Å OH-generating mechanisms of Fe 3 S 4 resulted in higher Å OH production of SV-rich Fe 3 S 4 compared to sulfur vacancy-poor Fe 3 S 4 (SV-poor Fe 3 S 4 ). Moreover, the Å OH production rate of SV-rich Fe 3 S 4 under oxic conditions (19.3 ± 1.0 lMh À1 ) was 1.6 times greater than under anoxic conditions (11.8 ± 0.4 lMh À1 ). As(III) removal experiments and X-ray photoelectron spectra (XPS) showed that both Å OH production pathways were favorable for As(III) oxidation, and a higher concentration of As(V) was immobilized on the surface of SV-rich Fe 3 S 4 under oxic conditions. This study provides new insights concerning Å OH production and environmental pollutants removal mechanisms on surface defects of Fe 3 S 4 under anoxic and oxic conditions.

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Section: Characterization Of S-vacancy Fe 3 Ssupporting

confidence: 94%

Section: Sample Preparationmentioning

confidence: 99%

Section: å Oh Production With Sv-fe 3 Smentioning

confidence: 99%

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Mechanisms for hydroxyl radical production and arsenic removal in sulfur-vacancy greigite (Fe3S4)

Liu

Zhou

et al. 2022

Journal of Colloid and Interface Science

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“…The FeS 2 /SiO 2 double mesoporous hollow spheres (DMHSs) not only exhibit a more outstanding POD-like activity than both Fe 3 O 4 NPs and FeS 2 NSs, but also are more susceptive to the detection of H 2 O 2 and glutathione (GSH) ( 50 ). The sulfur vacancies in magnetic greigite (SVs-Fe3S4) NSs have demonstrated a distinguished POD-mimic activity resulting from the abundant SVs, which have been developed for the colorimetric detection of glucose in human serum ( 51 ).…”

Section: Classification Of Nanozymesmentioning

confidence: 99%

Nanozymes in Tumor Theranostics

Liu

Zhu

et al. 2021

Front. Oncol.

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Nanozymes, a new generation of enzyme mimics, have recently attracted great attention. Nanozymes could catalyze chemical reactions as biological enzymes under physiologically mild conditions with higher-efficiency catalytic activities. Moreover, nanozymes could overcome the shortcomings of natural enzymes, such as easy inactivation, high cost, and low yield. With the development of more and more smart and multi-functional nanosystems, nanozymes display great achievement in tumor biology. In this review, we outline the recent advances of nanozymes in tumor and tumor microenvironment diagnosis, therapy, and theranostics.

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“…11 Accurate monitoring of blood glucose concentration is one of the best ways to prevent and treat diabetes. Thus far, numerous analytical methods have been developed for the detection of glucose, including electrochemistry, 12 colorimetry, 13 fluorescence, 11 and chemiluminescence. 14 However, these methods are generally based on a single-signal readout mode, 15,16 and the accuracy of the detection may be compromised by external interferences, such as nonstandard test procedures, diverse surrounding environments, and even different operators.…”

Section: ■ Introductionmentioning

confidence: 99%

Iron, Nitrogen-Doped Carbon Aerogels for Fluorescent and Electrochemical Dual-Mode Detection of Glucose

Sun

et al. 2021

Langmuir

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Due to their effective catalytic activity and maximum atom utilization, single metal atoms dispersed in carbon matrices have found diverse applications in electrocatalysis, photocatalysis, organic catalysis, and biosensing. Herein, iron is atomically dispersed into nitrogen-doped porous carbon aerogel by a facile pyrolysis procedure, and the resulting nanocomposite behaves both as a peroxidase mimic for the sensitive detection of glucose by fluorescence spectroscopy and as an effective catalyst for the electrochemical oxidation of glucose. The glucose concentration can be quantified within the millimolar to micromolar range with a limit of detection of 3.1 and 0.5 μM, respectively. Such a dual-functional detection platform also shows excellent reproducibility, stability, and selectivity, and the performance in glucose detection of clinical and artificial human body fluids is highly comparable to that of leading assays in recent studies and results from commercial sensors. Results from this study suggest that carbon aerogel-supported single atoms can be used as a dual-functional nanozyme for the construction of low-cost, high-performance dual-signal readout platforms for glucose detection.

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Sulfur vacancy promoted peroxidase-like activity of magnetic greigite (Fe3S4) for colorimetric detection of serum glucose

Cited by 64 publications

References 42 publications

Mechanisms for hydroxyl radical production and arsenic removal in sulfur-vacancy greigite (Fe3S4)

Mechanisms for hydroxyl radical production and arsenic removal in sulfur-vacancy greigite (Fe3S4)

Nanozymes in Tumor Theranostics

Iron, Nitrogen-Doped Carbon Aerogels for Fluorescent and Electrochemical Dual-Mode Detection of Glucose

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