Preparation and Fluorescence Property of Water-dispersible ZnSe:Co/ZnSe/ZnS Quantum Dots

Qiu, Chunhong; Huang, Feng; Huang, Tao; Fang, Xiu Ting; Huang, Meijing

doi:10.1088/1757-899x/423/1/012171

Cited by 2 publications

(3 citation statements)

References 17 publications

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“…Each bioanalyte is examined at concentration of 2.0 mM, pH 7 and 15 min incubation time. The quenching effect of urea is found to be the most superior (39%) in comparison to glucose, ascorbic acid, dopamine and cholic acid which have fluorescence responses of about 5, 12, 16 and 29%, respectively [46,[55][56][57][58][59][60]. Among all the tested biomolecules, urea reveals the highest quenching efficiency which could be attributed to adsorption of urea on the surface of GSH-capped ZnS QDs (Fig.…”

Section: Selectivity and Interference Of Gsh-capped Zns Qds-urease Co...mentioning

confidence: 91%

“…Among all the tested biomolecules, urea reveals the highest quenching efficiency which could be attributed to adsorption of urea on the surface of GSH-capped ZnS QDs (Fig. 7B) [57].…”

Section: Selectivity and Interference Of Gsh-capped Zns Qds-urease Co...mentioning

confidence: 96%

“…The enzymatic reaction between urea and urease occurs in a two-step mechanism. First, urease reacts with urea to produce ammonia and carbamate, then in the second step, the carbamate hydrolyzes to ammonia and carbonic acid [46,[56][57][58].NH 2 CONH 2 + 3H 2 O → 2NH + 4 + CO 2 + OH − As a result, increasing the concentration of urea causes an increase in pH from 7.64 in case of pure conjugate to 8.03 when incubated with 0.5 mM urea and to 9.61 when incubated with 5 mM urea and these results in a decline in the PL intensity.…”

Section: Detection Of Ureamentioning

confidence: 99%

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Glutathione-Capped ZnS Quantum Dots-Urease Conjugate as a Highly Sensitive Urea Probe

Metwly

Fadl

Soliman

et al. 2023

J Inorg Organomet Polym

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Quantum dots (QDs) possess characteristic chemical and optical features. In this light, ZnS QDs capped with glutathione (GSH) were synthesized via an easy aqueous co-precipitation technique. Fabricated QDs were characterized in terms of X-ray diffraction (XRD), high resolution transmission electron microscope (HRTEM), Fourier transform infrared (FTIR) and Zeta potential analyses. Optical properties were examined using photoluminescence (PL) and ultraviolet–visible (UV–visible) spectroscopies. Moreover, GSH-capped ZnS QDs were evaluated as an optical probe for non-enzymatic detection of urea depending on the quenching of PL intensity of ZnS QDs in the presence of urea from concentration range of 0.5–5 mM with a correlation coefficient (R2) of 0.995, sensitivity of 0.0875 mM−1 and LOD of 0.426 mM. Furthermore, GSH-capped ZnS QDs-urease conjugate was utilized as an optical probe for enzymatic detection of urea in the range from 1.0 µM to 5.0 mM. Interestingly, it was observed that urea has a good affinity towards ZnS QDs-urease conjugate with a linear relationship between the change of PL intensity and urea concentration. It was found that R2 is 0.997 with a sensitivity of 0.042 mM−1 for mM concentration (0.5–5 mM) and LOD of 0.401 mM. In case of µM concentration range (1–100 µM), R2 was 0.971 with a sensitivity of 0.0024 µM−1 and LOD of 0.687 µM. These data suggest that enzyme conjugation to capped QDs might improve their sensitivity and applicability. Graphical Abstract

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Section: Selectivity and Interference Of Gsh-capped Zns Qds-urease Co...mentioning

confidence: 91%

“…Among all the tested biomolecules, urea reveals the highest quenching efficiency which could be attributed to adsorption of urea on the surface of GSH-capped ZnS QDs (Fig. 7B) [57].…”

Section: Selectivity and Interference Of Gsh-capped Zns Qds-urease Co...mentioning

confidence: 96%

Section: Detection Of Ureamentioning

confidence: 99%

See 1 more Smart Citation

Glutathione-Capped ZnS Quantum Dots-Urease Conjugate as a Highly Sensitive Urea Probe

Metwly

Fadl

Soliman

et al. 2023

J Inorg Organomet Polym

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Biocompatible citrate-cysteine complexes of manganese as effective antioxidants: Experimental and computational studies

Khadivi-Derakhshan,

Pirouzmand,

Esrafili

et al. 2024

Journal of Molecular Structure

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Preparation and Fluorescence Property of Water-dispersible ZnSe:Co/ZnSe/ZnS Quantum Dots

Cited by 2 publications

References 17 publications

Glutathione-Capped ZnS Quantum Dots-Urease Conjugate as a Highly Sensitive Urea Probe

Glutathione-Capped ZnS Quantum Dots-Urease Conjugate as a Highly Sensitive Urea Probe

Biocompatible citrate-cysteine complexes of manganese as effective antioxidants: Experimental and computational studies

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