Wild jujube-based fluorescent carbon dots for highly sensitive determination of oxalic acid

Shi, Huimin; Li, Xue; Li, Yingying; Feng, Suling

doi:10.1039/d2ra03780g

Cited by 3 publications

(2 citation statements)

References 58 publications

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“…The typical absorption band observed in UV region at 270 nm was assigned to the characteristic π-π* electronic transition of aromatic conjugated C=C bonds in the sp 2 hybridized domain of graphitic core. 31 Another absorption band at 340 nm was attributed to n-π * transition of C-N, -C=O or -C-OH bonds of sp 3 hybridized domains 32 that originated from -NH 2 or -COOH groups present on N-CDs surface. Further, fluorescence spectra of N-CDs were recorded.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical Sensor Based on N–Doped Carbon Nanodots Derived from the Agro-Waste Cotton Boll Peel Extracts for Nano Molar Determination of an Anti-Cancer Drug, Pemetrexed

Mathad,

Teradal,

Seetharamappa

2023

J. Electrochem. Soc.

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A green, facile one-step synthetic route was proposed for synthesis of nitrogen-doped carbon nanodots (N-CDs) from agro-waste cotton boll peel extract as a natural carbon source and glycine as a nitrogen source. The prepared N-CDs were utilized to fabricate an electrochemical sensor for nanomolar determination of an anti-cancer drug, pemetrexed (PMT). The electrode material was characterized by X-ray diffraction, Fourier-transform infrared, transmission electron microscopy, Raman, energy-dispersive X-ray analysis, UV-vis, cyclic voltammetric and electrochemical impedance spectroscopic studies. The N-CDs drop-casted on the surface of glassy carbon electrode (GCE) served as a good sensing material and exhibited electrocatalytic activity as evident from ~20-fold enhancement in the oxidation peak current of PMT at N-CDs/GCE with 130 mV lesser positive oxidation peak potential than that at bare GCE. The sensing performance of the electrode was optimized by varying the peak current dependant parameters and by investigating the influence of interfering substances in the determination of PMT. Under optimized conditions, differential pulse voltammetric, square wave voltammetric, and adsorptive differential pulse voltammetric methods were developed for sensitive determination of PMT at nanomolar level. Further, these methods were applied successfully for the determination of PMT in analyte-fortified human urine samples and pharmaceutical formulations.

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Section: Resultsmentioning

confidence: 99%

Electrochemical Sensor Based on N–Doped Carbon Nanodots Derived from the Agro-Waste Cotton Boll Peel Extracts for Nano Molar Determination of an Anti-Cancer Drug, Pemetrexed

Mathad,

Teradal,

Seetharamappa

2023

J. Electrochem. Soc.

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“…Several additional colorimetric or fluorescent indicator-based methods have been reported, generally with lower sensitivity than electrochemical or mass-spectrometry-based methods [ 43 , 44 , 45 , 46 , 47 , 48 , 50 , 52 ]. All of these methods have the advantage of simple sample preparation, but invariably, they have either not been tested for interference from other organic anions, or interference has clearly been demonstrated.…”

Section: Methods For Detection and Quantification Of Oxalatementioning

confidence: 99%

Analytical Methods for Oxalate Quantification: The Ubiquitous Organic Anion

et al. 2023

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Oxalate is a divalent organic anion that affects many biological and commercial processes. It is derived from plant sources, such as spinach, rhubarb, tea, cacao, nuts, and beans, and therefore is commonly found in raw or processed food products. Oxalate can also be made endogenously by humans and other mammals as a byproduct of hepatic enzymatic reactions. It is theorized that plants use oxalate to store calcium and protect against herbivory. Clinically, oxalate is best known to be a major component of kidney stones, which commonly contain calcium oxalate crystals. Oxalate can induce an inflammatory response that decreases the immune system’s ability to remove renal crystals. When formulated with platinum as oxaliplatin (an anticancer drug), oxalate has been proposed to cause neurotoxicity and nerve pain. There are many sectors of industry that are hampered by oxalate, and others that depend on it. For example, calcium oxalate is troublesome in the pulp industry and the alumina industry as it deposits on machinery. On the other hand, oxalate is a common active component of rust removal and cleaning products. Due to its ubiquity, there is interest in developing efficient methods to quantify oxalate. Over the past four decades, many diverse methods have been reported. These approaches include electrochemical detection, liquid chromatography or gas chromatography coupled with mass spectrometry, enzymatic degradation of oxalate with oxalate oxidase and detection of hydrogen peroxide produced, and indicator displacement-based methods employing fluorescent or UV light-absorbing compounds. Enhancements in sensitivity have been reported for both electrochemical and mass-spectrometry-based methods as recently as this year. Indicator-based methods have realized a surge in interest that continues to date. The diversity of these approaches, in terms of instrumentation, sample preparation, and sensitivity, has made it clear that no single method will work best for every purpose. This review describes the strengths and limitations of each method, and may serve as a reference for investigators to decide which approach is most suitable for their work.

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Oxalate and oxalotrophy: an environmental perspective

Cowan,

Babenko,

Bird

et al. 2024

Sustainable Microbiology

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Oxalic acid is one of the most abundant organic acids produced by plants. Much of the global production of oxalic acid is deposited on soil surfaces in leaf litter, to be oxidised by microorganisms, resulting in a pH increase and shifting the carbonate equilibria. In what is known as the oxalate-carbonate pathway, calcium oxalate metabolism results in CO2 being sequestered into soils as insoluble calcite (CaCO3). There is a growing appreciation that the global scale of this process is sufficiently large to be an important contribution to global carbon turnover budgets. The microbiomics, genetics and enzymology of oxalotrophy are all soundly established, although a more detailed understanding of the landscape-scale kinetics of the process would be needed to incorporate oxalotrophy as an element of process models informing the relevant Sustainable Development Goals. Here, we review the current state of knowledge of oxalotrophs and oxalotrophy and the role they play in terrestrial ecosystem services and functions in terms of carbon sequestration and nutrient cycling. We emphasize the relevance of these to the Sustainability Development Goals (SDGs) and highlight the importance of recognising oxalotrophy when accounting for the natural capital value of an ecosystem.

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Wild jujube-based fluorescent carbon dots for highly sensitive determination of oxalic acid

Abstract: Carbon dots synthesized from wild jujube and dl-tryptophan can serve as sensitive off–on fluorescent sensors for the detection of oxalic acid.

Cited by 3 publications

References 58 publications

Electrochemical Sensor Based on N–Doped Carbon Nanodots Derived from the Agro-Waste Cotton Boll Peel Extracts for Nano Molar Determination of an Anti-Cancer Drug, Pemetrexed

Electrochemical Sensor Based on N–Doped Carbon Nanodots Derived from the Agro-Waste Cotton Boll Peel Extracts for Nano Molar Determination of an Anti-Cancer Drug, Pemetrexed

Analytical Methods for Oxalate Quantification: The Ubiquitous Organic Anion

Oxalate and oxalotrophy: an environmental perspective

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