An rGQD/chitosan nanocomposite-based pH-sensitive probe: application to sensing in urease activity assays

Shi, Fanping; Shang, Danyi; Wang, Zonghua

doi:10.1039/c9nj03268a

Cited by 7 publications

(1 citation statement)

References 33 publications

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“…CS has reactive amine groups on its backbone which are protonated in acidic medium, resulting in positively charged CS [31]. As indicated in Fig.2a, CS/TiO 2 nanocomposite was chemically prepared via the outer sphere complexation between the positively charged chains of CS and the negatively charged surface of TiO 2 NPs [32,33].…”

Section: Chemical Routementioning

confidence: 99%

Chitosan/TiO2 nanocomposites: Effect of microwave heating and solution mixing techniques on physical properties

Hussein¹,

Abdaleem²,

Darwish³

et al. 2020

Egypt. J. Chem.

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C HITOSAN/titanium oxide nanocomposite (CS/TiO 2 nanocomposite) could be prepared by different physical and chemical methods for various applications. CS/TiO 2 nanocomposite has been chemically prepared via microwave heating technique and physically prepared through solution mixing method. Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction spectroscopy (XRD), transmission electron microscopy (TEM) and dynamic light scattering (DLS) were used as spectral tools to characterize the functionality, phase, morphology and particles size of the prepared nanocomposites, respectively. The thermal stability was investigated by the thermogravimetric analysis (TGA), while optical properties were studied using ultraviolet-visible spectroscopy (UV-vis).The results have confirmed that CS/TiO 2 nanocomposite was chemically and physically prepared via the outer sphere complexation and the electrostatic repulsion between chitosan and titanium oxide nanoparticles surface (TiO 2 NPs), respectively. The thermal stability was enhanced with nanocomposite prepared by chemical method when compared to that prepared by the physical method. In addition, a significant shift in the peak of the chemically prepared nanocomposite from the UV region to visible region was observed. This shift could be attributed to the surface modification of TiO 2 NPs by the chemical reaction.

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Section: Chemical Routementioning

confidence: 99%

Chitosan/TiO2 nanocomposites: Effect of microwave heating and solution mixing techniques on physical properties

Hussein¹,

Abdaleem²,

Darwish³

et al. 2020

Egypt. J. Chem.

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Coordination polymer nanoprobe integrated carbon dot and phenol red for turn-on fluorescence detection of urease activity

Xiao

et al. 2023

Microchim Acta

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Recent studies on proteins and polysaccharides-based pH-responsive fluorescent materials

Xue,

Yao,

Wang

et al. 2024

International Journal of Biological Macromolecules

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An rGQD/chitosan nanocomposite-based pH-sensitive probe: application to sensing in urease activity assays

Abstract: We used the intriguing pH-responsive protonation/deprotonation transitions of chitosan and the fluorescence properties of reduced graphene quantum dots to design a novel pH probe and realize the real-time monitoring of urease activity.

Cited by 7 publications

References 33 publications

Chitosan/TiO2 nanocomposites: Effect of microwave heating and solution mixing techniques on physical properties

Chitosan/TiO2 nanocomposites: Effect of microwave heating and solution mixing techniques on physical properties

Coordination polymer nanoprobe integrated carbon dot and phenol red for turn-on fluorescence detection of urease activity

Recent studies on proteins and polysaccharides-based pH-responsive fluorescent materials

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