ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2023
·
IF 6.8
Yirong Zhang,Zhenchao Tan,Kaikai Qin,Chenglan Liu
Pesticides and heavy metals commonly coexist in soil. In this study, the influence of Cd and Cu on the toxicity of rac -dinotefuran and the enantioselective behavior of dinotefuran enantiomers in soil-earthworm microcosms were investigated. The acute toxic tests showed that S -dinotefuran has higher toxic than that of R -dinotefuran. The rac -dinotefuran and Cd has an antagonistic effect on earthworms, and the Cu and rac -dinotefuran has a synergistic effect. Earthworms maybe promoted the enantioselective behavior of dinotefuran in soil. Co-exposure to Cd or Cu inhibited the dissipation of dinotefuran enantiomers ( S -dinotefuran and R -enantiomers), and slightly reduced the enantioselectivity in soil. The earthworms were found to be preferentially enriched with S -dinotefuran. However, Cd or Cu attenuated the accumulation of dinotefuran enantiomers in earthworms and decreased the enantioselectivity. The effect of Cd and Cu on the environmental behaviors of dinotefuran enantiomers were correlated positively with the dose of Cd/Cu. These results showed that Cd and Cu alter the environmental behaviors and the toxicity of dinotefuran enantiomers in soil-earthworm microcosms. Thus, the influence of coexistent heavy metals on the ecological risk assessment of chiral pesticides should be considered.
研究领域:
环境科学
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Ximei Liang,Fangling Guan,Zhiyou Ling,Honghong Wang,Yunwen Tao,Elfi Kraka,Huajun Huang,Chenglong Yu,Danping Li,Jinbao He,Hansun Fang
Photodegradation of the insecticide pymetrozine (PYM) was studied on surface of wax films, and in aqueous and nonaqueous phase. The half-life of PYM on the wax surface was approximately 250 times longer than in water. Scavenging experiments, laser flash photolysis, and spectra analysis indicated the first singlet excited state of PYM (S1 * PYM ) to be the most important photoinduced species initiating the photodegradation. Quantum chemistry calculations identified significant molecular torsion and changes in the structure C–C N–N of S1 * PYM , and the absolute charges of the C N atoms increased and the bond strength weakened. Free energy surface analysis, and O 18 labeling experiments further confirmed that the mechanism was two-step photoinduced hydrolysis. The first step is the hydrolysis of S1 * PYM at C N upon reaction with 2–3 water molecules (one H 2 O molecule as the catalyst). The second step is an intramolecular hydrogen transfer coupled with the cleavage of C–N bond and formation of two cyclic products. During the interactions, water molecules experience catalytic activation by transferring protons, while there is a negligible solvent effect. Clarifying the detailed photodegradation mechanisms of PYM is beneficial for the development of green pesticides that are photostable and effective on leaf surfaces, and photolabile and detoxified in the aquatic environment.
研究领域:
环境科学
·
农药化学
·
量子化学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 11
·50040
·
IF 2.52
Shupeng Zhang,Lei Zhang,Xiaodong Yang,Wendong Hua,Junyun Qiu,Mingqian Zhang,Bo Zhang,Tianrui Ren
Coalescence and flocculation are two challenges for the stability and efficacy of pesticide suspension concentrate (SC) during the production and storage. To improve the stability of 25% pymetrozine SC, three comb-like poly(styrene-co-acrylic acid-co-polyethylene glycol methyl ether maleate) (SA-M) with different length side chains were synthesized by free radical polymerization and characterized by Fourier transform infrared spectroscopy and H-nuclear magnetic resonance. Surface-active parameters, including critical aggregation concentration (critical micelle concentration), saturation surface excess concentration ( Γ max ), minimum area per molecule ( A min ), and standard Gibbs free energy values were obtained from surface tension measurement. It shows that the surface-active property of SA-M decreased with the side chain length. Besides, 25% pymetrozine SC prepared using SA-M as dispersant had low zeta potential and low viscosity but high dispersibility and thermal storage stability. It is speculated that the formation of hydrogen bonds between nonionic branches and pymetrozine molecule at the expense of interruption of intermolecular hydrogen bonding between pymetrozine and water molecule, plays a key role in the stability mechanism.
研究领域:
农药科学
·
高分子化学
·
表面化学
✓ 已验证
DOI
高影响因子
Analytical Methods
·
2015
·Vol. 7
·期 21
·9100-9107
·
IF 1.821
Donglin Jia,Jian Gao,Lu Wang,Yudong Gao,Baoxian Ye
A simple and sensitive electrochemical method for the determination of the insecticide pymetrozine was proposed using a simple electrochemically pretreated glassy carbon electrode (EPGCE). Compared with the bare GCE, the electrochemical response signal of pymetrozine at the EPGCE showed a significant increase. The electrochemical behavior of pymetrozine was investigated systematically and some dynamics were investigated in detail for the first time. The results indicate that the reaction of pymetrozine on the EPGCE is a two electron and two proton process, which is controlled by both diffusion and adsorption. Under optimum conditions, a good linear relationship was obtained between peak currents and pymetrozine concentrations in the range of 1 × 10−7 to 5 × 10−6 mol L−1 with a detection limit of 8 × 10−8 mol L−1 (S/N = 3). The proposed method was applied to the determination of pymetrozine in real samples with satisfactory recovery results. Finally, the degradation of pymetrozine was also studied in natural soil.
研究领域:
分析化学
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环境科学
·
农药检测
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2023
·
IF 7.4
Ying Wang,Li Yin,Guangxu Qu,Chung-Hang Leung,Lei Han,Lihua Lu
Single-atom nanozymes (SAzymes) are novel mimic-enzyme materials with atomically doped active sites. They play a pivotal role in the field of nanozymes because of their excellent catalytic activities, high utilization efficiency of the metal atoms, and simple model of active sites. Herein, the peroxidase (POD)-like SAzymes with high-loading iridium (Ir) (5.31%) on graphene oxide (GO) nanosheets [Ir(III)/GO] were prepared through a coordination reaction between the Ir(III) complex and the oxygen-containing groups in GO. The preparation strategy avoids nitrogen doping and pyrolysis procedures which are the usually used strategies to improve the GO-based enzyme mimic activity. Ascribed to the highly active Ir atoms, Ir(III)/GO SAzymes demonstrate outstanding POD-like activity without the oxidase-like activity. In advantage of the excellent POD-like activity, a simple and sensitive colorimetric pesticide detection platform is established. The developed sensing platform offers an excellent “switch-on” pirimicarb (PIB) detection in the linear range of 10–300 nM with a limit of detection (LOD) of 2.81 nM. Moreover, the detection platform was fabricated into a portable test kit, which is composed of a test swab and sample processing tube. In the aid of a color-reading APP, the test kit can detect PIB with the LOD of 3.31 nM. It is astonishing to get this excellent detection sensitivity just using the simple colorimetric strategy. This work not only provides a novel strategy to synthesize Ir-based SAzymes but also exhibits the super capability of Ir(III)/GO in the biosensing field.
研究领域:
生物化学
·
纳米材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2021
·
IF 7.514
Xu Jing,Jing Wu,Huihui Wang,Luyao Guo,Xiaojiao Zheng,Xiaowen Wang,Shuo Wang
A novel deep eutectic solvent-based extraction and sulfur-doped carbon quantum dots (S-CQDs) serving as fluorescence probes to detect pirimicarb in cereals were established. The deep eutectic solvent was synthesized using choline chloride and butanediol, achieving direct and efficient extraction of pirimicarb residue in the cereals. The fluorescence quenching of S-CQDs was caused by the electrostatic interaction between the negatively charged S-CQDs and positively charged thiocholine, which was the hydrolysate of acetylthiocholine. The fluorescence of S-CQDs was enhanced as the activity of acetylcholinesterase (AChE) was inhibited by pirimicarb, achieving the detection of pirimicarb in the cereal samples. The limit of detection (LOD) was 0.006 μg mL −1 . The recovery ranged from 96.6% to 108.2%. This extraction and detection method of pirimicarb based on an environmentally friendly DES and S-CQD fluorescent sensor maintains good stability and convenience, offering a promising strategy for extracting and testing harmful substances in food samples.
研究领域:
分析化学
·
食品安全检测
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2021
·
IF 4.889
Jianqiang Song,Ning Zhao,Yuan Qu,Longshan Zhao
A novel green pH-sensitive fluorescent probe based on the surface passivation was designed for sensitive, rapid and reliable detection of pirimicarb (PRC). Using natural deep eutectic solvent (NADES) as the green precursor, N-CDs were hydrothermally synthesized, and combined with rhodamine B (RhB) to display strong fluorescence emission peaks at 400 and 582 nm, respectively. Upon the addition of PRC, the fluorescence sensor resulted in the enhanced fluorescence at 400 nm, while the orange signals hardly changed. Moreover, under the optimal conditions, the proposed assay exhibited super-fast, high selectivity and sensitivity for PRC with a wide linear range from 0.5 to 200 μg mL −1 and the relatively low detection limit around 0.3 μg mL −1 . Importantly, real sample analyses demonstrated that the as-presented sensor had excellent potential in pesticide monitoring. Meanwhile, the enhanced photoluminescence that become emissive upon stability from N-CDs was attributed to the reduction of surface defects after the surface passivation. In virtue of superior biocompatibility, excellent optical properties and low toxicity, the N-CDs were further employed to monitor the pH value.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL MICROBIOLOGY
·
2021
·Vol. 23
·期 6
·3265-3273
·
IF 5.491
Mingliang Zhang,Yijun Ren,Shilong Du,Yidong Zhou,Wankui Jiang,Zhijian Ke,Mingli Jiang,Jiguo Qiu,Jian He,Qing Hong
Summary Pymetrozine is a synthetic pesticide that can be utilized as the sole carbon source by Pseudomonas sp. strain BYT-1. However, the genes involved in the degradation of pymetrozine remain unknown. We used transposon mutagenesis to create a mutant that unable to hydrolyze pymetrozine. The transposon interrupted the gene pyzH , which was cloned by self-formed adaptor PCR. PyzH hydrolyzed the C=N double bond of pymetrozine to produce 4-amino-6-methyl-4,5-dihydro-2 H -[1,2,4]triazin-3-one (AMDT) and nicotinaldehyde; the latter inhibits PyzH activity. PyzH can completely hydrolyze pymetrozine in the presence of dehydrogenase ORF6, which can convert nicotinaldehyde into nicotinic acid and relieve the inhibition. H 2 18 O-labeling experiments showed that the oxygen atom of nicotinaldehyde came from water instead of oxygen. PyzH homologous genes were also found in other soil isolates able to degrade pymetrozine.
研究领域:
微生物学
·
环境科学
·
生物化学
·
分子生物学
✓ 已验证
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）