CHINESE CHEMICAL LETTERS
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2017
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IF 1.932
Wei Song,Hai-Juan Zhang,Ying-Hua Liu,Cui-Ling Ren,Hong-Li Chen
A new facile fluorescence probing strategy, which was based on N -doped carbon dots (NCDs) and methyl parathion hydrolase (MPH), was developed for the determination of parathion-methyl (PM). The fluorescence intensity of NCDs-MPH system was proportional to PM concentration in the range of 2.38–73.78 μmol/L, with a detection limit of 0.338 μmol/L. Moreover, the present simple and facile method could be used to determine methyl parathion in environmental and agricultural samples successfully. Furthermore, the detection mechanism of this system is inner filter effect and molecular interactions between NCDs and p -nitrophenol, which is the hydrolysis product of PM catalyzed by methyl parathion hydrolase.
研究领域:
环境科学
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分析化学
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生物化学
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DOI
高影响因子
Catalysts
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2024
·Vol. 14
·期 6
·346
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IF 3.8
Jingfei Luan,Jun Li,Ye Yao,Bowen Niu,Liang Hao,Yichun Wang,Zhe Li
A new catalyst, Sm2NdSbO7, was synthesized for the first time by solid-phase sintering. The study utilized X-ray diffraction, transmission electron microscope energy dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy to examine the structural characteristics of monocrystal BiDyO3, monocrystal Sm2NdSbO7and Sm2NdSbO7/BiDyO3heterojunction photocatalysts (SBHP) prepared by solid-phase sintering. The Sm2NdSbO7photocatalyst owned a pyrochlorite structure, belonged to the face-centered cubic crystal system, possessed a space group of Fd3m and a bandgap width of 2.750 eV. After 145 min of visible light irradiation (145-VLIRD), the removal rate (RMR) of methyl parathion (MP) or total organic carbon of SBHP was 100% or 97.58%, respectively. After 145-VLIRD, the photocatalytic degradation rates of SBHP to MP were 1.13 times, 1.20 times, and 2.43 times higher than those of the Sm2NdSbO7photocatalyst, the BiDyO3photocatalyst, and the nitrogen-doped TiO2catalyst, respectively. The experimental results showed that SBHP had good photocatalytic activity. After four cycles of cyclic degradation experiments with SBHP, the elimination rates of MP were 98.76%, 97.44%, 96.32%, and 95.72%, respectively. The results showed that SBHP had good stability. Finally, the possible degradation pathways and degradation mechanisms of MP were speculated. In this study, we successfully developed a high-efficiency heterojunction catalyst which responded to visible light and possessed significant photocatalytic activity. The catalyst could be used in photocatalytic reaction system for eliminating the harmful organic pollutants from wastewater.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Journal of Earth Science
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2019
·Vol. 30
·期 4
·861-869
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IF 1.784
Zhang Caixiang,Liao Xiaoping,Lü You,Nan Chao
The ligand-stabilized soluble Mn(III) recognized as active intermediate can potentially mediate the attenuation of contaminants. In this study, the abiotic degradation behaviors of methyl parathion in the ligand stabilized Mn(III)-sulfite system were investigated. The results showed that the yield of soluble Mn(III) produced from the redox reaction of MnO 2 and oxalic acid was dependent linearly on the dosage of MnO 2 and caused the decomposition of methyl parathion up to 50.1% in Mn(III)-sulfite system after 30 minutes. The fitted pseudo-first-order reaction constants of methyl parathion degradation increased with the increasing of the amount of produced Mn(III) but was not effected linearly by the addition of sulfite. Other ligands, including pyrophosphate and oxalic acid, acted as effective complexing agents to stabilize soluble Mn(III), and exhibited competitive effect on methyl parathion degradation with sulfite. The formation of Mn(III)-sulfite complexes is the critical step in the system to produce abundant reactive oxygen species identified as SO 3 • - to facilitate methyl parathion degradation. The hydrolysis and oxidation of methyl parathion were acknowledged as two primary transformation mechanisms in Mn(III)-sulfite system. These findings indicate that naturally ligands-stabilized soluble Mn(III) can be generated and could oxidatively decompose organophosphate pesticides such as methyl parathion.
研究领域:
环境科学
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化学
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DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
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2014
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IF 6.451
Juying Hou,Jing Dong,Haishuang Zhu,Xue Teng,Shiyun Ai,Minglin Mang
In this paper, a simple and sensitive fluorescent sensor for methyl parathion is developed based on l -tyrosine methyl ester functionalized carbon dots (Tyr-CDs) and tyrosinase system. The carbon dots are obtained by simple hydrothermal reaction using citric acid as carbon resource and l -tyrosine methyl ester as modification reagent. The carbon dots are characterized by transmission electron microscope, high resolution transmission electron microscopy , X-ray diffraction spectrum, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. The carbon dots show strong and stable photoluminescence with a quantum yield of 3.8%. Tyrosinase can catalyze the oxidation of tyrosine methyl ester on the surface of carbon dots to corresponding quinone products, which can quench the fluorescence of carbon dots. When organophosphorus pesticides (OPs) are introduced in system, they can decrease the enzyme activity , thus decrease the fluorescence quenching rate. Methyl parathion, as a model of OPs, was detected. Experimental results show that the enzyme inhibition rate is proportional to the logarithm of the methyl parathion concentration in the range 1.0×10 −10 –1.0×10 −4 M with the detection limit ( S / N =3) of 4.8×10 −11 M. This determination method shows a low detection limit, wide linear range, good selectivity and high reproducibility. This sensing system has been successfully used for the analysis of cabbage, milk and fruit juice samples.
研究领域:
分析化学
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环境科学
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农药检测
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DOI
高影响因子
ELECTROCHIMICA ACTA
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2018
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IF 5.116
Baokai Ma,Ling-Zhi Cheong,Xinchu Weng,Chin-Ping Tan,Cai Shen
Organophosphorus pesticides especially p -nitrophenyl pesticides (methyl parathion) have neurotoxic effects and it is a difficult to remove organophosphorus pesticides residues from contaminated water. Present work has developed a sensitive, direct and rapid lipase@ZIF-8/chitosan/glassy carbon electrode (GCE) and lipase@amine-modified ZIF-8(An-ZIF-8)/chitosan/GCE biosensors for detection of methyl parathion . ZIF-8 and An-ZIF-8 nanoparticles which are a type of metal-organic frameworks with large surface area and high porosity have been facilely prepared under mild biocompatible conditions and used as lipase immobilization matrixes in the biosensors. The optimized lipase@ZIF-8/chitosan/GCE and lipase@An-ZIF-8/chitosan/GCE biosensors can detect methyl parathion with a wide linear range, good repeatability, recovery and limit of detection as low as 0.28 μM. The as-prepared biosensors can be stored in 0.05 M PBS (pH 7) at 4 °C and reused for at least 20 days with a retainment of at least 80% of its initial response to methyl parathion. This indicated that both ZIF-8/chitosan and An-ZIF-8/chitosan are suitable for immobilization of lipase that favors generation of p -nitrophenol from methyl parathion; and subsequent electrochemical oxidation and electron transfer of the p -nitrophenol.
研究领域:
分析化学
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环境科学
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毒理学
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DOI
高影响因子
Analytical Methods
·
2014
·Vol. 6
·期 15
·5886-5890
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IF 1.938
Wenzhi Tang,Jiazheng Zhou,Qunqing Yang,Qiqi Zheng,Jian Wu
A novel electrode made of carbon nanotube and ionic liquid (n-octylpyridinium hexafluorophosphate) was developed for the solid-phase extraction and detection of methyl parathion (MP). The electrode effectively accumulated MP and increased the cathodic peak current. Cyclic voltammetry was used to characterize the fabricated electrode and the electrochemical properties of MP on it. Linear sweep voltammetry was used for the quantitative detection of MP. A self-correcting algorithm was exploited to isolate the small peak of MP from the large background current, obtaining a remarkable peak for MP along with a flat baseline. With a preconcentration time of 3 minutes, the peak current was linear for MP concentrations in the range from 0.1 to 2.5 μg mL−1 with a detection limit of 0.008 μg mL−1 (S/N = 3). The electrode was applied to detect MP in soil and food samples. These results indicated that the proposed method was capable of monitoring MP, providing a simple approach for routine analysis.
研究领域:
环境科学
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分析化学
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产品关联
DOI
高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
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2024
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IF 4
Jiale Han,Mengyuan Zhao,Fang Li,Meimei Guo,Yunhang Liu,Qiwen Ran,Zhankui Wang,Hongyuan Zhao
We developed an economical and environment-friendly technique for preparing the expired mung bean-derived porous carbon (EMBPC), which possessed large specific surface area and 3D interlinked carbon conductive network. Zirconium dioxide (ZrO 2 ) nanoparticles were further incorporated into the porous structure of EMBPC to form the EMBPC@ZrO 2 composite, which was served as electrode sensitizer for the fabrication of EMBPC@ZrO 2 /GCE sensor. EMBPC exhibited superior conductivity property and large electroactive area, which helped enhance the charge transfer efficiency between electrolyte and sensing electrode. ZrO 2 nanoparticles with good biocompatibility achieved the efficient adsorption of methyl parathion (MP) owing to the recognition of ZrO 2 towards the phosphate groups of MP. Furthermore, EMBPC with porous carbon conductive structure could make up for the inherent disadvantage of ZrO 2 nanoparticles in the term of electrical conductivity. The EMBPC@ZrO 2 /GCE sensor achieved the highly sensitive MP detection (LOD: 8.77 nM) in linear MP concentration range of 0.01–10 μM. The satisfactory practical property was realized at the EMBPC@ZrO 2 /GCE sensor with satisfactory recovery rates of 91.95–124.72% and low RSD% of 1.21–3.35% for the electrochemical detection of MP in food samples.
研究领域:
材料科学
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环境科学
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分析化学
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产品关联
DOI
高影响因子
FOOD CHEMISTRY
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2020
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IF 6.306
Shaofeng Yuan,Changjian Li,Yichi Zhang,Hang Yu,Yunfei Xie,Yahui Guo,Weirong Yao
The removal of pesticide residues in food by ultrasound has attracted more attention in recent years, and the formation of intermediate products may have some profound effects on the toxicity of treated food. Therefore, degradation of parathion methyl (PM) in bovine milk by ultrasonic treatment was studied in this paper. Results showed that the ultrasonic intensity and the initial concentration of PM had a significant effect on the degradation rate of PM (P < 0.05). The maximum degradation rate of PM was 97.10%. Three transformation products were identified through UPLC-QTOF/MS analysis, and the oxidation pathway was proposed as the consequence of ultrasonication. Furthermore, according to Quantitative Structure Activity Relationship (QSAR) model prediction, the ecotoxicity of the transformation products may be higher than that of PM. These findings showed that although ultrasonic treatment can effectively degrade pesticide residues in food, it may also generate transformation products with the higher ecotoxicity.
研究领域:
食品科学
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环境毒理学
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产品关联
DOI
PubMed
高影响因子
Toxics
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2023
·Vol. 11
·期 1
·84
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IF 4.6
Tianyi Chen,Haoze Chen,Anli Wang,Weixuan Yao,Zhongshi Xu,Binjie Wang,Jiye Wang,Yuanzhao Wu
Methyl parathion (MP) has been widely used as an organophosphorus pesticide for food preservation and pest management, resulting in its accumulation in the aquatic environment. However, the early developmental toxicity of MP to non-target species, especially aquatic vertebrates, has not been thoroughly investigated. In this study, zebrafish embryos were treated with 2.5, 5, or 10 mg/L of MP solution until 72 h post-fertilization (hpf). The results showed that MP exposure reduced spontaneous movement, hatching, and survival rates of zebrafish embryos and induced developmental abnormalities such as shortened body length, yolk edema, and spinal curvature. Notably, MP was found to induce cardiac abnormalities, including pericardial edema and decreased heart rate. Exposure to MP resulted in the accumulation of reactive oxygen species (ROS), decreased superoxide dismutase (SOD) activity, increased catalase (CAT) activity, elevated malondialdehyde (MDA) levels, and caused cardiac apoptosis in zebrafish embryos. Moreover, MP affected the transcription of cardiac development-related genes (vmhc,sox9b,nppa,tnnt2,bmp2b,bmp4) and apoptosis-related genes (p53,bax,bcl2). Astaxanthin could rescue MP-induced heart development defects by down-regulating oxidative stress. These findings suggest that MP induces cardiac developmental toxicity and provides additional evidence of MP toxicity to aquatic organisms.Keywords:methyl parathion;cardiotoxicity;oxidative damage;zebrafish;apoptosis
研究领域:
毒理学
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水生生物学
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发育生物学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2025
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IF 11.3
Jiahui Zhang,Wenliang Zhang,Yue Wang,Shaoyi Jiang,Yan Wang,Xiaomin Liu,Zhezheng Ding
Methyl parathion, as widely utilized organophosphorus pesticide, was commonly detected in aquatic environments. Heat-activated peroxymonosulfate (PMS) represented an emerging advanced oxidation process. In this study, the degradation efficiency and reaction mechanism of methyl parathion by heat-activated PMS system were investigated by experimental and theoretical aspects. The findings indicated that the degradation efficacy of methyl parathion improved with the increase in temperature, PMS concentration and pH. The radical quenching experiments revealed that the primary reactive radical initiating methyl parathion degradation was ·OH. Moreover, we determined that the coexistence mechanism existed in the heat-activated PMS process involving both PMS direct oxidative and radical oxidative degradation of methyl parathion. Then, the possible reactions of methyl parathion with ·OH and SO 4 ˙ˉ in the water environment were calculated at SMD/M06–2X/6–311++G(3df,2p)//SMD/M06–2X/6–311+G(d,p) level to clarify the detailed reaction mechanism. It was found that two reactive radicals were more prone to react with methyl parathion via addition reaction at the P=S bond. The total reaction rate constants of methyl parathion with ·OH and SO 4 ˙ˉ slightly decreased as the temperature increased from 298 K to 333 K. Eventually, the toxicity evaluation by the QSAR-based toxicity prediction software demonstrated that the aquatic toxicity of most products was lower than methyl parathion, but still has positive mutagenicity and toxic developmental toxicity. This work offered novel insights into the reaction mechanism of methyl parathion with activated PMS and could also help to clarify the fate of methyl parathion in the water environment.
研究领域:
环境科学
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化学
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毒理学
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产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
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2020
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IF 5.778
Xiaoping Liao,Caixiang Zhang,Chao Nan,You Lv,Zenghui Fan,Lisong Hu
Manganese oxides (MnO 2 ), important environmental oxides, have drawn significant attention in areas such as detoxification of micro-hazardous organic contaminants with electron-donating functional groups such as –OH. However, studies on whether these oxidized processes might further impact the fate of some esters like organophosphorus pesticide (OPPs) remain poorly understood. Herein, we propose a new mechanism involved in the enhanced removal of methyl parathion in mixtures of MnO 2 and phenol. Specifically, the removal of methyl parathion (up to 73.7%) was significantly higher for a binary system than for MnO 2 alone (approximately 9.3%) and was primarily due to adsorption rather than degradation. The extent of methyl parathion adsorption was dependent significantly on pH, reactant loading and metal ion co-solutes (such as Ca 2+ , Mg 2+ , Fe 3+ and Mn 2+ ). Both spectroscopic (FT-IR, SEM-EDX and XPS) and chromatographic (LC/HRMS) analyses showed that the remarkable increase in the number of organics (e.g., polymers) onto the MnO 2 surface dominated methyl parathion adsorption via hydrogen bonding, n-π and π-π interactions, van der Waals forces and pore-diffusion. The results from this study provided evidence for the role of manganese oxides in adsorption of methyl parathion in soil-aquatic environments involving phenolic compounds .
研究领域:
环境科学
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污染治理
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土壤与水体修复
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产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2021
·Vol. 13
·期 26
·2974-2980
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IF 2.896
Xinze Wu,Yifei Cao,Bin Sun,Huaixia Chen,Xueping Dang,Xiaolan Liu,Youhong Ai
In this study, magnetic Fe3O4@SiO2@β-cyclodextrin copolymerized microparticles were synthesized and applied for the extraction of methyl parathion and fenthion in lettuce samples followed by HPLC-UV detection. The magnetic β-cyclodextrin copolymerized microparticles were prepared by dispersion polymerization with acryloyl β-cyclodextrin as the functional monomer and ethylene glycol dimethyacrylate as the crosslinker. The composite magnetic microparticles were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, magnetic measurement, and thermogravimetric analysis, and used as the adsorbent of magnetic solid-phase extraction (MSPE) for methyl parathion and fenthion. The extraction conditions including sample pH and ionic strength, desorption solvent type and volume, and adsorption and desorption times were optimized. Under the optimal extraction conditions, an MSPE-HPLC-UV method was developed for the detection of methyl parathion and fenthion in lettuce. Wide linear ranges of 1.0–200 μg kg−1 (R2 = 0.9998) for methyl parathion and 1.5–200 μg kg−1 (R2 = 0.9978) for fenthion were obtained and the limits of detection were 0.3 μg kg−1 for methyl parathion and 0.5 μg kg−1 for fenthion in lettuce, respectively. The proposed method was applied for the determination of methyl parathion and fenthion in lettuce with satisfactory recoveries between 89.2–101.2%, and relative standard deviations were less than 9.1%. Thus, the MSPE-HPLC-UV method has high accuracy and sensitivity for the analysis of methyl parathion and fenthion in lettuce samples.
研究领域:
分析化学
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食品科学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）