Fast stopped-flow enzymatic sensing of fenitrothion in grapes and orange juice

Dı́az, A. Navas; Sánchez, Francisco; Aguilar, Alfonso; Vicente, A.B.M. de; Bautista, Adrienne C.

doi:10.1016/j.jfca.2015.04.005

Cited by 4 publications

(2 citation statements)

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“…Since this hydrolysis reaction is catalyzed by alkaline phosphatase (ALP), the YCD emission intensity at 550 nm can be modulated via ALP activity. Furthermore, fenitrothion is able to inhibit ALP’s activity, consequently resulting in decreased NPP hydrolysis to NTP. − Therefore, the YCDs can accordingly be incorporated with this enzymatic reaction to monitor the existence of fenitrothion pesticide as displayed in Scheme .…”

Section: Resultsmentioning

confidence: 99%

Multicolor Functional Carbon Dots via One-Step Refluxing Synthesis

et al. 2017

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Carbon dots are admirable fluorescent nanomaterials due to their low cost, high photostability, excellent biocompatibility, and environmental friendliness. Most conventional carbon dot fabrication approaches produce single-colored fluorescent material in the preparation process; different methods are therefore required to synthesize distinct carbon dots for specific optical applications. In this study, carbon dots carrying different emission colors are prepared through a one-step refluxing process. The emission of these materials can be well-tuned by sodium hydroxide content in the precursor solution. The carbon dots produced are used as sensing probes based on the spectrofluorometric inner filter effect for target molecule detection. Three sensing categories that combine carbon dots and inner filter effect are demonstrated, including direct, metal nanoparticle-assisted, and enzymatic reaction-supported detection. Caffeine, melamine, and fenitrothion are selected as targets to demonstrate the strategies, respectively. These multifunctional carbon dot-based sensors achieve comparable sensitivity toward analytes with a much more convenient preparation route.

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Section: Resultsmentioning

confidence: 99%

Multicolor Functional Carbon Dots via One-Step Refluxing Synthesis

et al. 2017

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“…In Burkina Faso, fenitrothion (FT), an organophosphate insecticide, is widely used in cotton cultivation and during locust invasions [1] [2]. Like other organophosphates, FT acts by inhibiting acetylcholinesterase, which disrupts nerve impulse transmission [3] [4]. Although FT degrades quickly and does not accumulate much in the environment, its degradation product, 3-methyl-4-nitrophenol (MNP), is highly persistent in the environment, particularly in water.…”

Section: Introductionmentioning

confidence: 99%

Indirect Electroanalysis of 3-Methyl-4-Nitrophenol in Water Using Carbon Fiber Microelectrode Modified with Nickel Tetrasulfonated Phthalocyanine Complex

Bako,

Mbokou,

Kaboré

et al. 2024

MSA

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Electrochemical detection of 3-methyl-4-nitrophenol (MNP) in direct phenol oxidation occurs at high potentials and generally leads to progressive passivation of the electrochemical sensor. This study describes the use of a carbon fiber microelectrode modified with a tetrasulfonated nickel phthalocyanine complex for the detection of MNP at a lower potential than that of direct phenol oxidation. The MNP voltammogram showed the presence of an anodic peak at −0.11 V vs SCE, corresponding to the oxidation of the hydroxylamine group generated after the reduction of the nitro group. The effect of buffer pH on the peak current and SWV parameters such as frequency, scan increment, and pulse amplitude were studied and optimized to have better electrochemical response of the proposed sensor. With these optimal parameters, the calibration curve shows that the peak current varied linearly as a function of MNP concentration, leading to a limit of detection (LoD) of 1.1 µg/L. These results show an appreciable sensitivity of the sensor for detecting the MNP at relatively low potentials, making it possible to avoid passivation phenomena.

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