SENSORS
·
2026
·Vol. 26
·期 9
·2851
·
IF 4
Ruonan Li,Jian Xu,Fankui Zeng
In this paper, SiQDs were synthesized using 3-aminopropyltrimethoxysilane, an organosilicon source, via the room temperature stirring method under atmospheric pressure. Based on the “Turn-off” and “Turn-on” fluorescence response mechanisms, the SiQDs/Fe3+fluorescent probe was constructed to quantitatively detect glyphosate according to the interaction between Fe3+and glyphosate. Subsequently, the impacts of pH, incubation temperature, and reaction time on the detection of glyphosate were systematically investigated. Under the optimized detection parameters, the fluorescent probe exhibited a linear range of 2–10 μg/mL and a detection limit of 394.74 ng/mL. The constructed fluorescent probe demonstrated outstanding anti-interference performance. It was applied to actual samples of potato and yam, yielding satisfactory detection results with recovery values between 91.69% and 104.53%. These findings provide novel ideas and theoretical support for glyphosate residue detection.
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JOURNAL OF SEPARATION SCIENCE
·
2017
·Vol. 41
·期 3
·732-739
·
IF 2.557
Dan Feng,Yan Xia
A Cr-based metal–organic framework, namely, MIL-101(Cr), was modified with amino (NH 2 –) and urea (UR 2 –) groups, and the materials were evaluated as adsorbents for glyphosate, and a comparison with commercial activated carbon was also discussed. The effects of the adsorption factors, such as adsorbent concentration, adsorption time, pH and ionic strength were mainly investigated. The results showed that a pseudo-second-order rate equation described the adsorption kinetics mechanisms well, while the Langmuir model and the Freundlich model fitted different adsorption isotherms, respectively. Among the adsorbents we studied, NH 2 -MIL-101(Cr) showed the maximum adsorbing capacity, which is 64.25 mg/g when pH = 3.0, while UR 2 -MIL-101(Cr) did not reach the best adsorption performance due to the steric hindrance. The work opens up a new way for the modification of metal–organic frameworks for adsorption process.
研究领域:
环境科学
·
材料科学
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Biosensors-Basel
·
2022
·Vol. 12
·期 10
·832
·
IF 5.743
Yuliang Cheng,Guowen Li,Xiufang Huang,Zhijuan Qian,Chifang Peng
In this work, a label-free fluorescent detection method for glyphosate, based on DNA-templated silver nanoclusters (DNA-Ag NCs) and a Cu2+-ion-modulated strategy, was developed. In the presence of Cu2+, the fluorescence of the DNA-Ag NCs was quenched. Glyphosate can restore the fluorescence of DNA-Ag NCs. By analyzing the storage stability of the obtained DNA-Ag NCs using different DNA templates, specific DNA-Ag NCs were selected for the construction of the glyphosate sensor. The ultrasensitive detection of glyphosate was achieved by optimizing the buffer pH and Cu2+concentration. The sensing of glyphosate demonstrated a linear response in the range of 1.0–50 ng/mL. The limit of detection (LOD) was 0.2 ng/mL. The proposed method was successfully applied in the detection of glyphosate in a real sample, indicating its high application potential for glyphosate detection.Keywords:label free;fluorescence;turn on;DNA;Cu2+;silver nanoclusters
研究领域:
分析化学
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环境科学
·
纳米技术
·
生物技术
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ANALYST
·
2024
·
IF 3.6
Xuyang Ma,Liqiang Liu,Shanshan Song,Hua Kuang,Chuanlai Xu,Xinxin Xu
Glyphosate (GLY) is widely applied in agriculture and horticulture as a herbicide. The development of genetically modified plants has caused abuse of GLY, with excessive residues potentially causing harm to human health. Consequently, a novel method needs to be built to detect GLY in soybeans and corn. Computer simulation was used to design an excellent hapten which was used to produce an anti-GLY monoclonal antibody (mAb) with outstanding sensitivity and affinity, and its 50%-inhibitory concentration (IC50) was 128.59 ng mL−1. Afterwards, an immunochromatographic assay strip was developed based on the mAb. In soybeans and corn, the visual detection limits were 1 mg kg−1 and 0.2 mg kg−1, while the cut-off values were 50 mg kg−1 and 5 mg kg−1, respectively. The reliability of the strips was proved by the existing methods. Thus, a rapid method to detect GLY residues on-site in soybeans and corn was established.
研究领域:
农业科学
·
环境科学
·
分析化学
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2023
·
IF 11.4
Kuiling Li,Sichao Zhu,Zimou Liu,Zhiyong Wang,Hongxin Liu,Yong Zhang,Lili Xu,Yu Zhang,Jianbing Wang,Jun Wang
The industrial effluent from glyphosate production has high salinity and refractory organic contaminants. The removal of organics and the recycling of inorganic salts from this kind of water are challenging issues. In this study, electro-Fenton (EF) and membrane distillation (MD) were coupled in a single reactor utilizing a membrane-based electrode (Mem-GDE) with the ability to bidirectionally transfer vapor and oxygen and electrochemically synthesize H2O2. The operating thermal conditions for MD significantly promoted Fenton reactions and, thus, the removal of glyphosate. During operation, Fe species deposited on the Mem-GDE and enhanced its catalytic activity and adsorptive capacity, which markedly increased the apparent reaction rate constant of glyphosate by 6 times. This novel EF-MD process simultaneously removed organics and concentrated the inorganics, which is very meaningful for decreasing the costs for subsequent crystallization and achieving high-quality crystal salts. This study provides an efficient method for the treatment of organic–inorganic hybrid wastewater.
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2023
·
IF 6.8
Jiaqi An,Yongcan Jiang,Huafen Cao,Ceng Yi,Suxia Li,Mengjie Qu,Guanglong Liu
Glyphosate is the most widely used herbicide in global agricultural cultivation. However, little is known about the environmental risks associated with its migration and transformation. We conducted light irradiation experiments to study the dynamics and mechanism of photodegradation of glyphosate in ditches, ponds and lakes, and evaluated the effect of glyphosate photodegradation on algae growth through algae culture experiments. Our results showed that glyphosate in ditches, ponds and lakes could undergo photochemical degradation under sunlight irradiation with the production of phosphate, and the photodegradation rate of glyphosate in ditches could reach 86% after 96 h under sunlight irradiation. Hydroxyl radicals (•OH) was the main reactive oxygen species (ROS) for glyphosate photodegradation, and its steady-state concentrations in ditches, ponds and lakes were 6.22 × 10 −17 , 4.73 × 10 −17 , and 4.90 × 10 −17 M. The fluorescence emission-excitation matrix (EEM) and other technologies further indicated that the humus components in dissolved organic matter (DOM) and nitrite were the main photosensitive substances producing •OH. In addition, the phosphate generated by glyphosate photodegradation could greatly promote the growth of Microcystis aeruginosa , thereby increasing the risk of eutrophication. Thus, glyphosate should be scientifically and reasonably applied to avoid environmental risks.
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JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Taotao Hu,Yixin Ma,Li Yang,Peng Liu,Yiqun Fan,Yan Zhang,Jingcai Cheng,Chao Yang
In this study, the solubility of glyphosate in three binary mixed solutions (sodium chloride + water, triethylamine hydrochloride + water, and glyphosine + water) and aqueous solutions with different initial pH values was determined by a static method within the temperature range from 293.15 K to 353.15 K. Interestingly, the effects of different components on the solubility of glyphosate in aqueous solutions are quite different. The solubility of glyphosate at different initial pH shows a significant U-shaped characteristic, with the lowest solubility at about pH 1.5. In the binary mixed solutions, when the concentration of NaCl increases, the solubility of glyphosate first increases and then decreases. The increase of the triethylamine hydrochloride concentration has a negative effect on the solubility of glyphosate, while the increase of the glyphosine concentration has a positive effect on the solubility of glyphosate. The effect of pH on the solubility of glyphosate was correlated with a pH correlation model, and the solubility of glyphosate in the three mixed solutions was correlated with the modified Apelblat equation, λh equation, Jouyban-Acree-Apelblat (J-A-A) model and the non-randomness two-liquid (NRTL) model. The values of root mean square deviation ( RMSD ) indicate a good correlation of the model. In addition, the mixed thermodynamic properties (Δ mix G, Δ mix H , and Δ mix S ) of glyphosate in the three binary mixed solutions were calculated based on the NRTL model, and it was found that the mixing of glyphosate in all three systems was spontaneous, heat-absorbing and entropy-driven. The obtained solubility data and thermodynamic properties can provide theoretical guidance for the crystallization of glyphosate.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2024
·
IF 4
Liyuan Zhang,Ruiting Zhang,Jinchen Wang,Jiayu Chen,Runzhong Yu
To establish a ratiometric fluorescence sensing system for the detection of glyphosate , nitrogen-sulfur doped carbon quantum dots nano-fluorescent probe was prepared by one-step hydrothermal method . At an excitation wavelength of 360 nm, the emission peak with maximum fluorescence intensity was obtained at 470 nm. The generation of 2.3-diaminophenazine by o-phenylenediamine oxidation produces a new fluorescence emission peak at 570 nm and a decrease in fluorescence at 470 nm. The fluorescence peaks at 470 and 570 nm form a ratio state. In the presence of glyphosate , reduces the oxidation of 2.3-diaminophenazine, this results in enhanced fluorescence at 470 nm and weakened fluorescence at 570 nm. Under the best conditions, the ratiometric fluorescence sensing system has good selectivity , the linear at glyphosate concentrations of 0.005–10 µg/mL, the limit of detection was 2.88 µg/kg, the limit of quantitation was 4.07 µg/kg. In addition, it is worth mentioning that this developed sensing system has shown good detection performance in 10 miscellaneous samples, the simple, efficient, and highly sensitive ratiometric fluorescence detection sensing strategy is provided.
研究领域:
分析化学
·
环境科学
·
食品科学
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Journal of Materials Chemistry B
·
2023
·Vol. 11
·期 40
·9630-9638
·
IF 7
Cong Jiang,Huimin Zhong,Jiahui Zou,Guancheng Zhu,Yanyan Huang
Conventional nanozyme-based pesticide detection often requires the assistance of acetylcholinesterase. In this work, a CuCeTA nanozyme was successfully designed for the direct colorimetric detection of glyphosate. Direct detection can effectively avoid the problems caused by cascading with natural enzymes such as acetylcholinesterase. By assembling tannic acid, copper sulfate pentahydrate and cerium(III) nitrate hexahydrate, CuCeTA nanoflowers were prepared. The obtained CuCeTA possessed excellent peroxidase-like activity that could catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) to blue oxidized TMB in the presence of hydrogen peroxide. Glyphosate could effectively inhibit the peroxidase-like activity of CuCeTA while other pesticides (fenthion, chlorpyrifos, profenofos, phosmet, bromoxynil and dichlorophen) did not show significant inhibitory effects on the catalytic activity of CuCeTA. In this way, CuCeTA could be used for the colorimetric detection of glyphosate with a low detection limit of 0.025 ppm. Combined with a smartphone and imageJ software, a glyphosate test paper was designed with a detection limit of 3.09 ppm. Fourier transform infrared spectroscopy demonstrated that glyphosate and CuCeTA might be bound by coordination, which could affect the catalytic activity of CuCeTA. Our CuCeTA-based nanozyme system exhibited unique selectivity and sensitivity for glyphosate detection and this work may provide a new strategy for rapid and convenient detection of pesticides.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Peng Yu,Xi Li,Xiao Zhang,Hui Zhou,Yanhua Xu,Yongjun Sun,Huaili Zheng
In this study, co-precipitation was used to prepare Fe 3 O 4 magnetic powder activated carbon (PAC) (Fe 3 O4-PAC) and MnFe 2 O 4 magnetic PAC (MnFe 2 O 4 -PAC) for the in-depth treatment of glyphosate pesticide wastewater. Magnetic adsorbent characterization results indicate that MnFe 2 O 4 was successfully loaded on the activated carbon powder. Adsorption experiment results show that the maximum adsorption capacity of MnFe 2 O 4 -PAC for glyphosate is two to three times that of the original PAC. The adsorption of glyphosate by using magnetic PAC conforms to the Langmuir adsorption isotherm, and the adsorption kinetics is consistent with the quasi-second adsorption kinetic model. The adsorption capacity of Fe 3 O 4 -PAC and MnFe 2 O 4 -PAC showed the same trend effect with the change in pH, temperature, and adsorbent dosage. The adsorption capacity of Fe 3 O 4 -PAC and MnFe 2 O 4 -PAC for glyphosate decreased with the increase in pH and magnetic PAC and rises with temperature. Regeneration experiment results showed that the order of the regeneration method of MnFe 2 O 4 -PAC is: microwave combined Fenton reagent regeneration > wet microwave regeneration > microwave combined hydrogen peroxide regeneration. MnFe 2 O 4 -PAC after regeneration still exhibited good magnetic properties and adsorption capacity.
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ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY
·
2020
·Vol. 40
·期 2
·342-351
·
IF 3.152
Wenjing Wang,Ming Jiang,Yanqing Sheng
Glyphosate is a commonly used herbicide known for its high performance in killing certain plants and grasses; however, its use is regulated due to its harmful effects on the aquatic environment. The present study investigated and compared the toxic mechanisms of glyphosate on Microcystis aeruginosa (a toxin-producing cyanobacterium) under 2 conditions: 0‰ saline media (experiment I) and 2.5‰ saline media (experiment II). The results indicated that an appropriate concentration of glyphosate provided a phosphate source for M. aeruginosa , resulting in an increased specific growth rate in both experimental groups compared with the controls. Glyphosate-enhanced alkaline phosphatase (ALP) activity increased by up to 1.37-fold in experiment I and 1.68-fold in experiment II. Moreover, the activities of superoxide dismutase (SOD) and catalase (CAT) decreased at glyphosate concentrations below 1.2 mg L –1 but increased at concentrations greater than 1.2 mg L –1 in experiment I, whereas SOD and CAT activities decreased in experiment II and declined by 64 and 49% in the 30 mg L −1 treatments. Furthermore, the transcript abundances of the pyruvate carboxylase ( pcB ), microcystin synthetase B ( mcyB ) , and paired-like homeobox ( phoX ) genes were up-regulated by up to 6.92-, 3.63-, and 2.27-fold in experiment I and 6.74-, 6.55-, and 4.86-fold in experiment II after 96 h of incubation. The addition of glyphosate stimulated the production of dissolved organic matter including tryptophan-like substances, fulvic acid-like substances, (marine) humic acid-like substances, and microcystin–leucine-arginine in the culture. In conclusion, glyphosate stimulates the proliferation of M. aeruginosa and enhances the release of dissolved organic matter in saltwater ecosystems. Environ Toxicol Chem 2021;40:342–351. © 2020 SETAC
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NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 43
·期 1
·121-129
·
IF 3.201
Dandan Guo,Nadeem Muhammad,Chaoyan Lou,Dan Shou,Yan Zhu
Recently, the growing abuse of glyphosate herbicides in agricultural production has caused widespread accumulation of glyphosate in the environment, which is threatening the health or life of human beings and animals. To solve this problem, novel dendrimer grafted adsorbents were proposed for the rapid and efficient removal of glyphosate from water samples. These adsorbents were synthesized by grafting poly(amidoamine) dendrimers (PAMAM) onto poly(styrene-divinyl benzene-glycidylmethacrylate) beads. The morphological structure and chemical composition of the adsorbents were investigated by SEM, the BET method, FTIR spectroscopy, XPS and elemental analysis. Batch adsorption experiments were performed in glyphosate standard solutions with different pH, temperatures, and initial concentrations. Under the optimized conditions, adsorption equilibrium was attained rapidly within 5 min. Experimental data were correlated well with the pseudo-second-order model and the Langmuir model. The effect of temperature was also discussed by the thermodynamic parameters. Unlike other glyphosate adsorbents, their adsorption capabilities could be easily controlled by varying the generation of PAMAM dendrimer used. In addition, regeneration experiments showed that the adsorbents exhibited good reproducibility. When applied in the purification of contaminated drinking water, the removal efficiency of the adsorbents could be more than 95%.
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