Sensitive assay of pharmaceutical amines in environmental samples and formulations by oxygenated graphene quantum dots

Sefidan, Somayyeh Baghi; Eskandari, Habibollah

doi:10.1016/j.measurement.2018.09.063

Cited by 5 publications

(1 citation statement)

References 59 publications

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“…Fluorescence analysis has low cost, simple operation and high sensitivity, among which the fluorescence analysis method based on quantum dots is widely used [24][25][26][27][28]. There are many types of graphene quantum dots that can be used for analysis and detection of different substances, including nitrite [29][30][31][32][33]. An orange-glowing nitrogen-doped carbon dots (N-CDs) synthesized by Jia et al [34], might be used as a fluorescence enhancement sensor to detect nitrite quantitatively.…”

Section: Introductionmentioning

confidence: 99%

The synthesis and application of L-cysteine graphene quantum dots for quantitative analysis of nitrite content in water

Jin,

Li,

et al. 2024

Phys. Scr.

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The limit standard of nitrite content in drinking water is an internationally recognized safety indicator. Some fluorescence analysis methods used for quantitative analysis of nitrite suffered from low anti-interference performance and inadequate specificity. In this article, L-cysteine graphene quantum dots have been synthesized and used to built a sensor system of ratiometric fluorescence with CdTe quantum dots. The L-cysteine graphene quantum dots were characterized by TEM and XPS. Results shown that the size of product is about 2 nm with homogeneous dispersion and a interplanar distance 0.235 nm, and there were hydroxyl, carboxyl, amino and sulfhydryl groups on its surface. Also, according to the linear association between nitrite concentrations and the ratio of fluorescence intensities at 421 and 570 nm (F421 nm/F570 nm), the quantitative analysis of nitrite in water has been realized, of which the linear range was 7.25 - 72.5 nmol/L, and the lowest detection limit was 3.012 nmol/L. This method with high sensitivity, selectivity, and anti-interference ability might be applied to analyze of nitrite in water quantitatively.

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Section: Introductionmentioning

confidence: 99%

The synthesis and application of L-cysteine graphene quantum dots for quantitative analysis of nitrite content in water

Jin,

Li,

et al. 2024

Phys. Scr.

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Evaluation of Modified Guar Gum as Polymer for Electrospun Nanofibrous Film

Sharma,

Singh,

Ahuja

2025

Polymers for Advanced Techs

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This study aimed to fabricate metoclopramide‐loaded nanofibers based on esterified guar gum using electrospinning. Guar gum was chemically modified through esterification, with structural changes confirmed via 1H NMR and FT‐IR analyses. Rheological and swelling studies demonstrated that this modification reduced viscosity and swelling capacity, enhancing the polymer's suitability for electrospinning. Polyvinyl alcohol was incorporated as a co‐polymer with the modified guar gum to improve fiber morphology and uniformity. The resulting metoclopramide‐loaded nanofibrous film exhibited an average fiber diameter of 77.43 nm. Physical and mechanical evaluations showed an increase in fiber density in the drug‐loaded samples, attributed to interactions between metoclopramide and the polymer matrix, accompanied by a corresponding decrease in porosity. FT‐IR analysis confirmed successful drug incorporation, while thermal stability was comparable between drug‐loaded and unloaded nanofibers. Comparative in vitro release studies revealed rapid metoclopramide release from the electrospun nanofibrous film within 5 min, whereas the solvent‐cast film achieved 80% drug release in 30 min. These findings highlight the potential of chemically modified guar gum‐based nanofibers for fast and efficient drug delivery, indicating their broader applicability in pharmaceutical and nanomaterial‐based technologies.

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Photogeneration of reagent radicals for detection of ascorbic acid by using highly photoluminescent nitrogen-doped carbon quantum dots

Khajavi,

Eskandari,

Pourbasheer

2024

Journal of Photochemistry and Photobiology A: Chemistry

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Sensitive assay of pharmaceutical amines in environmental samples and formulations by oxygenated graphene quantum dots

Cited by 5 publications

References 59 publications

The synthesis and application of L-cysteine graphene quantum dots for quantitative analysis of nitrite content in water

The synthesis and application of L-cysteine graphene quantum dots for quantitative analysis of nitrite content in water

Evaluation of Modified Guar Gum as Polymer for Electrospun Nanofibrous Film

Photogeneration of reagent radicals for detection of ascorbic acid by using highly photoluminescent nitrogen-doped carbon quantum dots

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