Current Research in Food Science
·
2026
·
IF 7
Yating Liu,Na Gan,Peiran Liu,Junjie Xu,Fang Geng,Di Wu
Unraveling the interaction mechanism between the food azo dye tartrazine (Tz) and β -lactoglobulin ( β -LG) under varying pH conditions is crucial for understanding their safe application in food systems. Molecular docking indicated that Tz primarily bound to the β -hydrophobic barrel of β -LG. The protonation of lysine residues diminished with increasing pH, which reduced hydrogen bond formation. The binding energy decreased from 8.77 kcal/mol (pH 2.0) to 8.43 kcal/mol (pH 7.4). Molecular dynamics simulations indicated that Tz bound exerts the greatest structural influence on β -LG at pH 2.0. Fluorescence and thermodynamic analyses confirmed that Tz quenched β -LG fluorescence through a static mechanism, through their interaction was a spontaneous process driven mainly by hydrophobic forces. The protonation level of β -LG gradually decreased with increasing pH, and electrostatic repulsion between β -LG and Tz was observed at pH 7.4. As a result, the binding constant between Tz and β -LG decreased from 6.669 × 10 5 L/mol (pH 2.0) to 3.596 × 10 5 L/mol (pH 5.2) and 0.956 × 10 5 L/mol (pH 7.4), respectively. Furthermore, Tz induced changes in the secondary structure content of β -LG and reduced its surface hydrophobicity under all pH conditions.
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DYES AND PIGMENTS
·
2022
·
IF 5.122
Lin Yuan,Lei Jiang,Ze Liu,Yingying Xiang,Fei Song,Yujiao Tu
Tartrazine preferred in food and textile industries, but excessive consumption threats human health. Due to toxicity, non-biodegradability, and trace accumulation in the food chains, Hg 2+ has attracted people's attention. Thus, it is important to detect tartrazine and Hg 2+ with sensitivity way. Using VB 2 and citrate as precursors, yellow-green fluorescent carbon dots were prepared by hydrothermal method . The N-CDs were purified by dialysis, thin layer chromatography and chromatographic column. Excellent linear ranges of 0.25–5 μM and 5–50 μM of tartrazine were obtained with low detection limits 34.98 nM, while good linear ranges of 0.25–5 μM and 10–50 μM of Hg 2+ with low detection limits 29.64 nM, respectively. In addition, the quenching mechanisms of targets to the fluorescent of N-CDs were illuminated. Furthermore, the nanoprobe was efficiently applied to determine the content of tartrazine in carbonated drink, fruit jelly and sugar samples, and Hg 2+ in tap water, lake water, and river water samples. It showed great potential to detect tartrazine and Hg 2+ .
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Haijian Liu,Miao Wang,Guofu Huang
A new composite material (SDs@ZIF-8) was synthesized by integrating sulfur nanodots (SDs) into metal-organic frameworks (ZIF-8) through a facile one-step self-assembly strategy. The obtained SDs@ZIF-8 has not only the high adsorption performance of ZIF-8 but also the superior fluorescence characteristics of SDs . The composite featured good dispersibility, stable structure as well as excellent fluorescence in water solution, and can be used as an ideal fluorescent sensor for tartrazine detection. Due to the high specific surface area and adsorption performance of ZIF-8, the prepared composite material can significantly enrich tartrazine, further enhancing the sensitivity of analysis. The fluorescence of SDs @ZIF-8 composite can be effectively quenched by tartrazine through the inner filter effect. The sensing technique exhibited exceptional sensitivity, as evidenced by its impressive detection limit of 6.5 nM across a broad linear range spanning from 0.02 to 90 μM. In addition to its high sensitivity, the technique displayed rapid response times and excellent selectivity. Moreover, the fluorescent sensing technology we developed has been employed successfully for the detection of tartrazine in real samples, which is expected to promote the development of the food safety industry.
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ANALYTICAL LETTERS
·
2023
·
IF 2
Nan Xu,Ting Pu,Lei Chen,Qin Yang,AnYuan Tong,FuBin Chen,ChunYan Yang
Herein, nitrogen-doped carbon quantum dots (N-CQDs) were synthesized by a solvothermal reaction for the determination of tartrazine in food. The microscopic structures and optical properties were examined by high resolution transmission electron microscopy, x-ray diffraction, x-ray photoelectron spectroscopy, Fourier-transform infrared and ultraviolet-visible absorption spectroscopy. The fluorescence emission of the N-CQDs were 450 nm upon the excitation of 350 nm with a quantum yield of 14%. The N-CQDs provide a good linear range from 0.8 to 100 μM and low detection limit of 0.078 μM. The constructed fluorescent probe was successfully adopted to determine tartrazine in food samples with good accuracy. The fluorescence quenching mechanism of tartrazine by the N-CQDs are likely due to the static quenching and inner filter effect. Overall, a wide linear range, sensitive and stable fluorescent probe is provided which indicates a new method for the determination of tartrazine.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Peilong Wang,Xu Liu,Qingqing Hu,Hui Gao,Wei Ma
A simple and rapid electrochemical method based on a poly(L-arginine)-electrochemically reduced graphene oxide-modified glassy carbon electrode fabricated by cyclic voltammetry has been developed for the determination of tartrazine. Compared with the bare glassy carbon electrode, the modified electrode achieved a well-defined and enhanced oxidation peak due to the increased conductivity and electrochemical active surface area. The bare glassy carbon electrode and the modified electrode were characterized by scanning electron microscopy and electrochemical impedance spectroscopy. The electrocatalytic oxidation behaviors of tartrazine on the modified electrode were investigated using cyclic voltammetry and differential pulse voltammetry. The voltammetric peak current of tartrazine exhibits good linearity in the range of 1.00×10 -6 -2.50×10 -4 mol L -1 under the optimal differential pulse voltammetry conditions, with a detection limit of 2.5×10 -7 mol L -1 (at an S/N of 3). This proposed method has also been applied for quantitative analysis of tartrazine in some carbonated beverage and fruit juice samples, with satisfactory results.
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JOURNAL OF FLUORESCENCE
·
2024
·
IF 2.6
Zhu RongGui,Jin Lei,Yang Bing,Ma Yuan,Zhou You,Xiao RongDan,Meng YiJie,Hou Ye,Xie BenTing,Jiang Xiu Juan
A green, economical and simple method for the preparation of water-soluble, high-fluorescent carbon quantum dots (CQDs) has been developed via hydrothermal process using pomelo peels as carbon source. The synthesized CQDs were characterized by transmission electron microscopy (TEM), X-ray diffraction(XRD), Fourier transform infrared spectroscopy (FTIR), UV − vis absorption spectra and fluorescence spectrophotometer. The results reveal that the as-prepared C-dots were spherical shape with an average diameter of 2.64 nm and emit bright blue photoluminescence (PL) with a quantum yield of approximately 3.63%. The surface of the C-dots was rich in hydroxyl groups and presented various merits including excellent photostability, low toxicity, and satisfactory solubility. Additionally, we found that two widely used synthetic food colorants, tartrazine and sunset yellow, could result in a strong fluorescence quenching of the C-dots, The possible mechanisms are caused by different ratios of inner filter and static quenching effects. According to this property, This study attempts to establish an analytical method for the determination of tartrazine and sunset yellow using carbon quantum dots as fluorescent probe. A linear relationship was found in the range of 0-100 µM tartrazine and sunset yellow with the detection limit(3σ/k) of 0.65 nM and 1.7 nM. The relative standard deviation (RSD) was 3.5% (tartrazine) and 3.0% (sunset yellow).This observation was further successfully applied for the determination of tartrazine and sunset yellow in food samples collected from local markets, and the recovery rates of the two ranges from 79% to 117.8 and 81 -103.5%, respectively. suggesting its great potential toward food routine analysis.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2018
·
IF 2.88
Yingping Li,Yong Jia,Qi Zeng,Xiaohui Jiang,Zhengjun Cheng
We used thiamine nitrate (TN) as single material to fabricate nitrogen and sulfur co-doped carbon quantum dots (N,S-CQDs) with a quantum yield of 10.4% through one-pot hydrothermal method , and its properties were characterized by TEM, XPS, FTIR, fluorescence (FL) and UV–vis spectrophotometer, respectively. The fluorescence of N,S-CQDs was effectively quenched in the presence of vitamin B12 (VB12)/tartrazine due to Förster resonance energy transfer (FRET). Moreover, the rate ( K T ) and efficiency ( E %) of energy transfer from N,S-CQDs (as a donor) to VB12/tartrazine (as an acceptor) enhanced with increasing the concentrations of acceptor, and the K T and E % were also varied with the change of excitation wavelengths (from 338 to 408 nm). Based on this principle, a multifunctional fluorescence probe was designed for selective and sensitive detection of VB12/tartrazine with a detection limit (3σ/slope) of 15.6/18.0 nmol/L. Meanwhile, the proposed method was successfully employed to detect VB12/tartrazine in milk and several beverages with a recovery range of 97.5–104.2%/91.0–110.6%.
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CHEMOSPHERE
·
2021
·
IF 7.086
Nguyen Trung Dung,Le Thuy Duong,Nguyen Thi Hoa,Vu Dinh Thao,Le Viet Ngan,Nguyen Nhat Huy
In this study, cobalt ferrite coated carbon felt (CoFe 2 O 4 /CF) was synthesized by solvothermal method and applied as cathode for electro-Fenton (EF) treatment of tartrazine (TTZ) in water. The materials were characterized by SEM, XRD, FTIR, CV, and EIS to explore their physical, chemical, and electrical properties. The effects of solvothermal temperature and metal content on the TTZ removal were examined, showing that 220 °C with 2 mM of Co and 4 mM of Fe precursors were the best synthesis condition. Various influencing factors such as applied current density, pH, TTZ concentration, and electrolytes were investigated, and the optimal condition was found at 8.33 mA cm −2 , pH 3, 50 mgTTZ L −1 , and 50 mM of Na 2 SO 4 , respectively. By radical quenching test, , 1 O 2 , and HO were recognized as the key reactive oxygen species and the reaction mechanism was proposed for the EF decolorization of TTZ using CoFe 2 O 4 /CF cathode. The reusability and stability test showed that the highly efficient CoFe 2 O 4 /CF cathode is very promising for practical application in wastewater treatment , especially for dyes and other recalcitrant organic compounds to improve its biodegradability .
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IONICS
·
2025
·
IF 2.6
Li Chunxiang,Xia Sushuang,Qian Xinmei,Zheng Mingyu,Deng Keqin
Electrocatalyst with high accumulation capacity and efficient electrocatalysis are crucial for constructing electrochemical sensors. In this study, 3D hierarchical nitrogen-doped carbon nanosheets decorated by Fe 3 O 4 /CoFe nanoparticles (Fe 3 O 4 /CoFe@N-CSs) were successfully prepared. The morphology, composition, microstructure, and property were investigated by SEM, HRTEM, XRD, XPS, and cyclic voltammetry. The synthesized Fe 3 O 4 /CoFe@N-CSs were assembled by two-dimensional (2D) nanosheets to form flower-like layered structure. It displayed a large amount of pore space for promoting the accumulation of targets and brilliant electrocatalysis towards the electrochemical oxidation of sunset yellow (SY) and tartrazine (TTZ). Using Fe 3 O 4 /CoFe@N-CSs to modify screen-printed electrode (SPE), a disposable electrochemical sensor (Fe 3 O 4 /CoFe@N-CSs/SPE) was constructed for the analysis of SY and TTZ. It showed the detection range of 0.008–5.0 μM and 0.02–10.0 μM with the detection limit of 2.0 nM and 4.0 nM, respectively. The practical applicability of the sensor in real drink samples provided satisfactory data. The results indicated that Fe 3 O 4 /CoFe@N-CSs was a promising nanomaterial, contributing great potential for individual and synchronous measurement of trace amounts of SY and TTZ in food samples.
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FULLERENES NANOTUBES AND CARBON NANOSTRUCTURES
·
2023
·
IF 2.3
Arsalan Gholipour,Shahrzad Rahmani
Nowadays, carbon quantum dots (CDs) as semiconductor synthesized nanoparticles have become an attractive subject for lots of applications due to their remarkable features. In the current study, the highly fluorescent (FL) CDs with great characteristics were synthesized through a novel one-step microwave irradiation by citric acid monohydrate and urea as carbon precursors. The as-prepared CDs were quasi-spherical shape with an average diameter of 4.5 nm and emitted bright blue FL under ultraviolet light irradiation (UV). Furthermore, the synthesized CDs possessed different properties such as diverse functional groups, good sensitivity and selectivity, high water-solubility, low toxicity, and significant stability in various environmental conditions. The results indicated that the as-prepared CDs can be applied as a fluorescent probe for detection of different concentrations of tartrazine from 5 to 100 µM in food samples. In addition, the findings revealed that the good linear relationship was obtained between the FL intensity of CDs and different concentrations of tartrazine over the range of 5 to 100 µM with the detection limit of 2.58 µM.
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Catalysts
·
2022
·Vol. 12
·期 10
·1114
·
IF 4.501
Wenqi You,Liang Liu,Junjie Xu,Tao Jin,Lichun Fu,Yuwei Pan
Zero-valent iron/peroxymonosulfate (Fe0/PMS) has been considered as a promising approach for wastewater treatment. Anions and cations are widely present in wastewater and have significant effects on the performance of the Fe0/PMS system for wastewater treatment. Thus, in the present study, tartrazine was selected as the target model; SO42−, NO3−, HCO3−, and Cl−were selected as representative anions and Ca2+, Cu2+, Mg2+, and Mn2+were chosen as representative cations. The effect of these anions and cations on tartrazine removal and major radicals in the Fe0/PMS were systematically investigated. The presence of a certain concentration of SO42−and Cl−had positive, NO3−had negative, and HCO3−had negligible effects on tartrazine removal in the Fe0/PMS system. SO42−and HCO3−had a small effect on the contribution proportion of reduction, SO4•−and•OH; a certain concentration of Cl−could enhance the contribution proportion of•OH; and NO3−would decrease the contribution proportion of SO4•−and•OH. A certain concentration of each of Ca2+, Cu2+, Mg2+, and Mn2+could enhance the tartrazine removal in the Fe0/PMS system. Ca2+, Cu2+, and Mg2+had no effect of the contribution of reduction, SO4•−and•OH, while a certain concentration of Mn2+could enhance the contribution proportion of SO4•−. These results can provide some references for the Fe0/PMS system to treat actual wastewater containing anions and cations.Keywords:zero-valent iron;peroxymonosulfate;anions;cations
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Zheng Guo,Han-Yi Zheng,Zhong-Ying Huang,Yue-Zhen Liu,Yao-Hua Liu,Yun Chen,Jing Gao,Yong Hu,Chao Huang
A ternary deep eutectic solvent (DES) consisting of choline chloride, lactic acid, and urea in a molar ratio of 1:2:2 was used to pretreat chamomile residue, followed by carbon dots (CDs) preparation using a one-pot solvothermal method . The CDs prepared under the suitable conditions had a high quantum yield of 47.34% and could be used as a bifunctional fluorescent probe for the detection of tartrazine and Fe(III). The concentration of tartrazine or Fe(III) had a good linear relationship with the fluorescence intensity of CDs that the determination coefficient ( R 2 ) was 0.9957 and 0.9943, and the limit of detection (LOD) was 40 nM and 119 nM, respectively. After verifying the different fluorescence quenching mechanisms of CDs by these two substances, a quantitative analysis was performed on real samples with recoveries of 90.70%∼104.29%. Overall, this study provided a promising technology for chemical conversion from low-cost chamomile residue to attractive bifunctional fluorescent probe.
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