N,Cl co-doped fluorescent carbon dots as nanoprobe for detection of tartrazine in beverages

Yang, Xiupei; Xu, Jing; Luo, Na; Tang, Fenglin; Zhang, Maoxue; Zhao, Baojun

doi:10.1016/j.foodchem.2019.125832

Cited by 73 publications

(27 citation statements)

References 40 publications

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“…) have a strong destructive effect on the photostability of fluorescent dyes, as well as other kinds of ROS, such as hydroxyl radical (•OH), peroxynitrite (ONOO À ) and hypochlorite (ClO À ). 32,[35][36][37][38][39] Hydroxyl radical (•OH) generated from a definite concentration of H 2 O 2 and Fe(ClO 4 ) 2 was as the exogenous ROS. 36 Fluorescein and UF nanoparticles with the same absorbance were used as the control segments.…”

Section: •-mentioning

confidence: 99%

Improving the photostability of fluorescent dyes by polymer nano‐insulating layer

Zhao

Song

Lin

et al. 2021

J of Applied Polymer Sci

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Fluorescein is a traditional organic fluorescent dye that has the disadvantage of agglomeration-induced fluorescence quenching and photobleaching due to its large hydrophobic conjugate π-π system, which makes them have limitations in many fields of application. A method of polymer modification is revealed to address this issue. In this study, fluorescein molecules were modified by polycaprolactone (PCL) to obtain PCL grafting fluorescein (P x F), and subsequently assembled with PEG-PCL to obtain fluorescent nanoparticles (PPxF).PPxF would realize long term cellular fluorescence imaging. PCL polymerization induces self-assembly, which effectively avoids fluorescence quenching caused by fluorescent molecules aggregation, and at the same time well inhibit the energy transfer with oxygen to improve photostability. This method is a good way to improve the fluorescence properties of fluorescent dyes, to be suitable for all traditional organic fluorescent dyes to greatly improve their fluorescence and hydrophilic properties and enhance their application fields.

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Section: •-mentioning

confidence: 99%

Improving the photostability of fluorescent dyes by polymer nano‐insulating layer

Zhao

Song

Lin

et al. 2021

J of Applied Polymer Sci

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“…The FRET mechanism is only the transfer of energy does not involve the transfer of photons. [ 48 ] Here, CDs‐PTD is the energy donor and FCF is the energy acceptor. Under the irradiation of excitation wavelength, the energy of CDs‐PTD is transferred to FCF, resulting in the fluorescence quenching of the energy donor.…”

Section: Resultsmentioning

confidence: 99%

Fluorescence Sensing Performance of Carbon Dots of Functionalization toward Sunset Yellow

Sun

Yan

et al. 2021

Part & Part Syst Charact

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Sunset yellow (FCF), a commonly used food additive, can brighten foods, but the improper amount of addition can also cause various diseases. Herein, the fluorescence sensor CDs‐PTD for detecting FCF is synthesized by functionalizing carbon dots (CDs) with 3,4,9,10‐pertetracarboxylic dianhydride (PTD). The prepared CDs‐PTD shows excitation‐independent fluorescence behavior with maximum fluorescence emission at 553 nm under 490 nm excitation and high quantum yields (21.4%). With the presence of FCF, the fluorescence of the sensor is quenched due to fluorescence resonance energy transfer (FRET). The CDs‐PTD exhibits excellent selectivity and sensitivity toward FCF in the range of 0–180 × 10−6 m with a low detection limit of 106.8 × 10−9 m. In addition, the sensor is applied to the detection of FCF in beverage samples with recoveries ranging from 97% to 106%. And a portable CDs‐PTD/agarose gel reagent strip is prepared for the assessment of FCF content within 15 min. The CDs‐PTD can be an ideal sensor for detecting FCF in food, and provides a new idea for the detection of food additives.

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“…It can be seen that these interfering substances had a certain effect on the determination of DA, but the effect was not significant. Recently, we reported using similar methods to detect tartrazine and metronidazole [20][21][22]. The actual samples were food, medicine and rabbit blood.…”

Section: Selectivity Of the Proposed Methodsmentioning

confidence: 99%

Selective Determination of Dopamine in Pharmaceuticals and Human Urine Using Carbon Quantum Dots as a Fluorescent Probe

Yang

Tian

et al. 2021

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A cost-effective and environmentally friendly method was formulated for rapid dopamine (DA) detection that was based on the fluorescence (FL) quenching of carbon quantum dots (C-dots). Upon adding DA to the C-dots’ solution, we noticed a regular reduction in their fluorescence intensity. The effects of pH, amount of C-dots, reaction temperature and time on the determination of DA were investigated. Under the optimized experimental conditions, trace amounts of DA could be analyzed. Furthermore, dopamine hydrochloride injection and human urine samples with and without spiked DA were analyzed using the developed sensing system. The procedure was validated following the guidelines of the European Medicines Agency (EMA) in terms of the following: calibration range (0.3–100 μM), linearity (R2 = 0.9991), limit of detection (LOD) (93 nM). Recoveries of dopamine with spiked samples at three different levels were between 95.0 and 105.9%, and the relative standard deviations (RSDs) were within 2.68% (n = 6). This method is simple and suitable for the determination of dopamine in pharmaceuticals and human urine for clinical application. Compared with previous reports, the proposed method offers great advantages including ease of C-dot sensor preparation (one-pot synthesis), environmentally friendly sample preparation by using either water or phosphate buffer solution only, a short response time and selectivity.

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N,Cl co-doped fluorescent carbon dots as nanoprobe for detection of tartrazine in beverages

Cited by 73 publications

References 40 publications

Improving the photostability of fluorescent dyes by polymer nano‐insulating layer

Improving the photostability of fluorescent dyes by polymer nano‐insulating layer

Fluorescence Sensing Performance of Carbon Dots of Functionalization toward Sunset Yellow

Selective Determination of Dopamine in Pharmaceuticals and Human Urine Using Carbon Quantum Dots as a Fluorescent Probe

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