PEST MANAGEMENT SCIENCE
·
2020
·Vol. 76
·期 11
·3792-3799
·
IF 3.75
Xiujun Tang,Fengjiao Hao,Huizhu Yuan,Xiaojing Yan,Daibin Yang,Alan G Taylor
BACKGROUND A systemic seed treatment can be taken up into shoot tissues during early corn seedling growth. However, the pathway that a systemic compound is taken up, either from seed or root uptake to shoot tissues is not fully understood. To study the single contributions of seed pathway and root pathway for the uptake and translocation of imidacloprid seed treatment, two methods were developed: A seed treatment method and a growing media/hydroponic solution delivery method. The seed treatment method employed a live and dead seed separated with plastic wrap to provide a barrier. The growing media/hydroponic solution delivery method quantified the capacity for uptake by seeds and roots. RESULTS The seed pathway transported 1.9–2.5 times more imidacloprid into shoot tissues when compared to the root pathway at the same dosage rate. The higher amount of imidacloprid taken up and translocated by the seed pathway was attributed to the fact that the corn seeds were in direct contact with high provided concentrations of imidacloprid. However, the root pathway showed 7.9–9.5 times higher capacity for transporting imidacloprid into shoot tissues when compared with the seed pathway. Whenever imidacloprid was taken up by seed or root, amounts of imidacloprid were measured in both tissues of seed and root. CONCLUSION The seed pathway transported more imidacloprid than the root pathway during early seedling growth since corn seeds were contacted by higher concentrations of imidacloprid. Both seed pathway and root pathway were occurring concurrently during early seedling growth of corn. © 2020 Society of Chemical Industry
研究领域:
植物生理学
·
农药科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Guohong Yao,Sisi Li,Jun Xu,Hui Liu
A dual-responsive hydrogel based on graphene oxide (GO) was prepared by in situ radical copolymerization of N-isopropyl acrylamide (NIPAM) as a temperature-sensitive component and acrylic acid (AA) as a pH-sensitive unit. The resulting hydrogels (GO/poly(NIPAM-co-AA) (PNA) were systematically characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, thermogravimetric analysis, differential scanning calorimetry, and scanning electron microscopy. With the change of AA content, the lower critical solution temperature of hydrogels changed from 26.91 to 24.38 °C. The swelling ratio under alkaline condition was higher than that under acidic condition. The adsorption of rhodamine B (RB) followed Langmuir isotherm model and pseudo-second-order model, and nearly 93% of RB could be released within 10 h at pH 4.01 and 60 °C. With imidacloprid as the model drug, the higher cumulative release rate of the GO/PNA hydrogel was obviously observed at pH = 4.01 than at pH = 9.18. On the basis of their good adsorption–desorption, loading-releasing, and regeneration ability, the GO/PNA hydrogel as a multifunctional adsorbent might have broad application prospects in environmental protection and biomedical engineering.
研究领域:
材料科学
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环境科学
·
生物医学工程
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产品关联
DOI
高影响因子
PEST MANAGEMENT SCIENCE
·
2024
·
IF 3.8
Yiyun Gao,Wenjun Xiao,Chenhua Gu,Sheng Yu,Shengke Li,Aihua Zou
Background Conventional pesticide formulations are often griped about inefficiency due to the low biological uptake after spraying. Controlled release nanopesticides can precisely release pesticides in response to specific stimuli, thereby killing pests and pathogens with the least effective concentration. This study aims to develop nanocapsules-based photo decomposable nanopesticides for efficient pesticide control. Results The target nanopesticides were successfully fabricated by using layer-by-layer assembly of azobenzene grafted hyaluronic acid (Azo-HA) and PolyDADMAC, confirmed by UV–vis, DLS, Zeta potential and TEM measurements. Particle size and Zeta potential of the fabricated nanocapsules were 220 nm and + 46.1 mV, respectively, and the nanocapsules were found to maintain stable for up to 30 days. The optimized drug loading and encapsulation ratio of Imidacloprid (IMI) in IMI/Azo-HA@PolyDADMAC were 21.5% and 91.3%, respectively. Cumulative release of IMI from the nanopesticides was increased from ~50% to ~95% upon UV-light irradiation (365 nm). LC 50 value of the nanopesticides towards Aphis craccivora Koch was decreased from 2.22 mg/L to 0.55 mg/L upon UV-light irradiation. Conclusion The trans to cis transformation of Azo group in HA will decompose IMI/Azo-HA@PolyDADMAC nanopesticides upon UV irradiation, thus facilitated the IMI release, resulting in decreased concentration of pesticides for efficient pesticide control. Our work demonstrated the great potential of light-responsive nanocapsules as controlled release nanocarrier for efficient and eco-friendly pesticide-control in sustainable agriculture. This article is protected by copyright. All rights reserved.
研究领域:
材料科学
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纳米技术
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农药科学
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农业工程
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 30
·75595-75609
·
IF 5.8
Jiang Mengyun,Xu Zhongjun,Zhang Tingting,Zhang Xirong,Liu Ying,Liu Peng,Chen Xiaochun
In this work, FeS supported SBA-15 mesoporous silica catalyst (FeS@SBA-15) was synthesized successfully, characterized and first applied to persulfate (PS) activation for the degradation of imidacloprid in wastewater. The as-prepared 3.5-FeS@SBA-15 presented an impressive imidacloprid removal efficiency of 93.1% and reaction stoichiometric efficiency (RSE) of 1.82% after 5 min, ascribed to the synergetic effects of improved FeS dispersion and abundant surface sites by SBA-15. Electron paramagnetic resonance spectra and quenching experiments proved that both SO 4 ·- and ·OH were produced in FeS@SBA-15/PS system, and SO 4 ·- played a dominant role in the degradation process. The S 2- can accelerate the cycling of Fe(III)/Fe(II) during activation and increase the steady-state concentration of Fe(II). More importantly, the constructed heterogeneous system exhibited an efficient and stable catalytic activity over a wide range of pH (3.0-9.0), temperature (283K-313K), inorganic ion (NO 3 - ) and humic acid (1-20 mg/L). Moreover, the density functional theory calculations were conducted to predict the potential reaction sites of imidacloprid. Based on eighteen identified intermediates, four main degradation pathways were proposed: hydroxylation, dechlorination, hydrolysis, and the ring cleavage of the imidazolidine. ECOSAR analysis indicated hydroxylation and dechlorination played a key role in the detoxification of the formed compounds. These findings would provide new insights into the application of FeS@SBA-15 catalyst in wastewater treatment and the removal mechanism of imidacloprid from wastewater.
研究领域:
环境科学
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催化
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废水处理
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化学工程
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材料科学
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产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Qicai Zhang,Xianli Wang,Qinxiong Rao,Shanshan Chen,Weiguo Song
An improved understanding of imidacloprid (IMI) metabolism and accumulation in casing soil or compost-mushroom systems will help to optimise the safe use of IMI for agricultural pest control in Agaricus bisporus cultivation. In this study, the dissipation, metabolites and accumulation of IMI in casing soil or compost- A. bisporus systems were investigated. The results show that the IMI dissipation half-lives at doses of 10 and 50 mg kg −1 were 65 d and 59 d in casing soil and 6.6 d and 6.2 d in compost, respectively during the cultivation period. Three IMI metabolites were observed in casing soil during cultivation of mushrooms. Urea-imidacloprid (IMI-urea) was a major metabolite, accounting for more than 59%. In compost, the main metabolite in the first 5 days was IMI-urea, from 5 to 10 days olefin-imidacloprid (IMI-ole) and 6-chloronicotinic acid (6-CNA) were both the most prominent compounds, and after 10 days 6-CNA alone. At 50 mg kg −1 dose, IMI and the metabolites (IMI-urea, IMI-ole) were detected in the fruiting body with IMI applied to casing soil and only the metabolite 6-CNA was detected in fruiting body with IMI applied to compost. The bio concentration factors (BCFs) of IMI-ole and IMI-urea were higher than of IMI and 6-CNA, and the BCFs had no obvious relationship with log K ow . Furthermore, the potential dietary risk of IMI in A. bisporus was acceptable when application rates in casing soil or compost was up to 50 mg kg −1 . Our study supports a safe use of IMI as agricultural pest control in A. bisporus cultivation.
研究领域:
农业科学
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环境科学
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毒理学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
·
2022
·
IF 3.571
Yudan Wang,Jia’ an Qin,Jing Zhang,Ziyue Jin,Jiaoyang Luo,Meihua Yang
Three different imidacloprid hapten structures were designed to conjugate with proteins (bovine serum albumin, BSA; ovalbumin , OVA; keyhole limpet hemocyanin , KLH) for screening the optimal immunogen and coating antigen. Among these, an unreported antigen (hapten 6-KLH) was selected as the optimal immunogen and coating antigen. In addition, an imidacloprid-specific and high titer monoclonal antibody (IMIB7C3) was obtained by using the above-selected immunogen. A sensitive ic-ELISA (indirect competitive enzyme-linked immunosorbent assay) with a half-maximal inhibitory concentration (IC 50 ) of 1.3 ng mL −1 was established by using the IMIB7C3 antibody (only 1.2 ng per well) to detect the residues of imidacloprid in grains (wheat and maize) and different herbs ( Notoginseng radix et rhizoma, Dioscoreae rhizoma, Lonicerae japonicae flos, Astragali radix , Jujubae fructus ). The detection results of real samples by the developed immunoassay were confirmed by liquid chromatography-tandem mass spectrometry (LC–MS/MS), which proved the accuracy and reliability of the established ic-ELISA. These results indicate that the proposed ic-ELISA method is suitable for rapid and high-throughput detection of imidacloprid residues in agricultural products and medicinal herbs. Furthermore, a quantitative risk assessment was conducted for Lonicerae japonicae flos based on the detection results, which indicates an acceptable risk to human health after the intake of Lonicerae japonicae flos polluted by imidacloprid.
研究领域:
农业化学
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分析化学
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免疫学
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药理学
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产品关联
DOI
PubMed
高影响因子
TALANTA
·
2022
·
IF 6.556
Fengya Wang,Xiaobo Zhang,Hui Zhi,Liang Feng
The most widely used assays for pesticides currently rely on the inhibition of natural enzymes, which are particularly sensitive to the surrounding environment, leading to some unreliable results. Up till now, there are few studies explored chemical detection methods for these stable pesticides. Here, we reported a novel chemosensor system and polymer materials for highly sensitive detection of imidacloprid pesticide. The polymer monolith with tunable surface hydrophilicity allows solvent-dependent adsorption of low-abundance target pesticide molecule. Prussian blue particles with Fenton catalytic activity were introduced into the polymeric monolith through Pickering emulsion , which capable of degrading the pesticide adsorbed on the column surface into easily detectable ions (NO 3 −, Cl − ). This all-in-one functional material can minimize the interference of other non-target molecules through dual-channel detection, enabling sensitive detection of imidacloprid pesticide (30 ppb). We believe that the material described in this paper demonstrates for the first time the combination of an active polymer monolith for the enrichment and catalytic degradation with sensitive detection of pesticides, and this protocol can be used to develop a range of pesticides chemical sensing methods in the future.
研究领域:
分析化学
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环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Ying Wang,Meng Zhang,Tong Bu,Feier Bai,Shuang Zhao,Yuanyuan Cao,Kunyi He,Haiyu Wu,Jia Xi,Li Wang
In this work, a highly sensitive immunochromatographic test strip (ITS) based on Scandium-Tetrakis (4-carboxyphenyl) porphyrin (TCPP) metal–organic framework nanocubes (ScTMNs) was developed for ultrasensitive and facile visual determination of imidacloprid (IDP). TCPP as the porphyrin-based planar ligand and Sc 3+ as the metal center were applied to form the ScTMNs via coordination chelation. Giving the credit to its excellent optical characteristics, strong affinity with monoclonal antibodies, and favorable biocompatibility, the ScTMNs was selected as a signal tag. Under optimized conditions, the ITS exhibited a great liner relationship in the range of 0.04–3 ng/mL and the detection limit was 0.04 ng/mL for the IDP detection. Additionally, IDP was successfully detected in tomatoes, millet, corn and carrot samples with satisfied recoveries. To the best of our knowledge, this is the first time that ScTMNs have been used in immunochromatography which are expected to have potential applications in detection of other substances.
研究领域:
食品科学
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分析化学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2022
·
IF 5.122
Ziqi Wei,Weiyi Zhang,Shengjie Wang,Yiyi Han,Dongsheng Feng,Yingqing Ma,Bo Deng,Zixin Chen,Jialuo Mao,Fei Xu,Zhen Wang,Hui Cao
Herein, A ratiometric fluorescent sensor based on molecularly imprinted multilevel mesoporous silica (MIFP—SiCQDs@CdTe QDs) was designed for highly sensitive detection of imidacloprid (IDP) pesticide with long half-life in soil, plants, and water environments. In this sensor, CdTe QDs were anchored onto the multilevel mesoporous of MIFP—SiCQDs by post-imprinting modification as the analytical signal to improve the detection sensitivity of the conventional doping method (d-MIFP). The results showed that the synthesized MIFP—SiCQDs@CdTe QDs possessed both small mesopore (2–3 nm) and large mesopore (5–50 nm), which is favorable for the anchoring of CdTe QDs (about 2–3 nm in diameter) and the mass transfer of IDP into them. Due to the multilevel mesoporous structure and low background, the sensor responded well to the addition of IDP in the range of 5 ng mL −1 –0.5 μg mL −1 with a detection limit of 3.55 ng mL −1 . The MIFP—SiCQDs@CdTe QDs sensor was successfully applied to determine IDP levels in real samples with the average recovery ranging from 97.64 to 109.88% and RSD values ranging from 1.00 to 4.65%. Furthermore, the quenching mechanism of MIFP—SiCQDs@CdTe QDs by IDP was considered to be the dynamic quenching. These results proved that the construction of multilevel mesoporous and post-imprinting modification of the analytical signal is an effective method to improve the sensitivity of d-MIP.
研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Dong Li,Chunran Zhou,Shuai Wang,Zhan Hu,Jia Xie,Canping Pan,Ranfeng Sun
Overusing imidacloprid (IMI) has been found to impede secondary metabolism and hinder plant growth. The impact of IMI stress on the interaction between metabolites, rhizosphere, and plant-microbe dispersion through various pathways in pepper plants has not been extensively studied. This study investigated the effects of IMI on plant signaling components, secondary metabolic pathways, and microbial communities in the rhizosphere and phyllosphere . Here, the distribution of IMI and its metabolites (6-chloronicotinic acid, IMI-desnitro, 5-hydroxy-IMI, IMI-urea, and IMI-olefin) was primarily observed in the pepper plant leaves. A rise in IMI concentration had a more significant inhibitive effect on the metabolism of pepper leaves than on pepper roots. The findings of non-target metabolomics indicated that IMI exposure primarily suppresses secondary metabolism in pepper plants, encompassing flavones, phenolic acids, and phytohormones. Notably, the IMI treatment disrupted the equilibrium between plants and microbes by decreasing the population of microorganisms such as Vicinamibacteria , Verrucomicrobiae , Gemmatimonadetes , and Gammaproteobacteria in the phyllosphere, as well as Vicinamibacteria , Gemmatimonadetes , Gammaproteobacteria , and Alphaproteobacteria in the rhizosphere of pepper plants. The study demonstrates that overexposure to IMI harms microbial composition and metabolite distribution in the rhizosphere soil and pepper seedlings, inhibiting plant growth.
研究领域:
植物学
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环境科学
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微生物学
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产品关联
DOI
PubMed
高影响因子
Catalysts
·
2025
·Vol. 15
·期 2
·192
·
IF 4
Dongshi Feng,Jiangdong Dai,Yongsheng Yan,Chunxiang Li
Developing a catalyst with excellent electrical conductivity and catalytic performance for on-site testing of residual imidacloprid is significant and challenging. In situ growth of Mo2C nanodots on Co-induced N-doped carbon nanotubes (Co/Mo2C/N-CNT) was synthesized to construct a molecularly imprinted electrochemical sensor for the detection of imidacloprid. The results proved that the catalytic performance of Co/Mo2C/N-CNT for imidacloprid was over two times higher than those of Co/N-CNT and commercial CNT. This improvement was attributed to the formation of a heterostructure between Co species, Mo2C, and N-CNT, which facilitated highly exposed catalytic active sites. Additionally, the abundant Mo2C nano-dots promoted interfacial charge transfer to achieve optimal dynamics. The optimum preparation parameters of the catalysts were obtained by response surface methodology. By analyzing the relationship between different pH values and peak potential, as well as the influence of different scanning rates on peak potential, it was deduced that the possible electrocatalytic mechanism of imidacloprid involved the reduction of the nitro group to a hydroxylamine group and H2O. Under optimal conditions, the limit of detection (LOD) was 0.033 × 10−6mol·L−1(R2= 0.99698), and the linear range was 0.1 × 10−6~100 × 10−6mol·L−1. The application effect of the prepared sensor was evaluated by measuring the imidacloprid in two kinds of tea, indicating that the sensor possessed good sensitivity and selectivity, and was capable of meeting the requirements of on-site detection.
研究领域:
分析化学
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yang Zhang,Lingwei Gao,Juhong Zhan,Erzhuo Zhao,Huijiao Wang,Chunrong Wang,Yujue Wang
In this study, degradation of the neonicotinoid insecticide imidacloprid (IMI) by ozonation and the E-peroxone process was investigated. Results show that IMI is an O 3 -refractory compound with second-order rate constants for the reaction with O 3 and • OH ( k O3,IMI and k •OH,IMI ) being 3.9 and 3.95 × 10 9 M −1 s −1 at pH 7, respectively. Due to its low O 3 reactivity, IMI was only abated by < 20 % in a selected groundwater during ozonation with typical ozone doses applied in water treatment (1–5 mg/L). In comparison, the E-peroxone process considerably enhanced IMI removal efficiency to > 80 % under similar reaction conditions. During both ozonation and the E-peroxone process, IMI was mainly abated by • OH oxidation. The reaction mechanism of IMI with • OH was investigated with quantum computations, which show that H-abstraction at H23 site was the most favorable pathway. Sixteen transformation products (TPs) generated from IMI degradation were identified using various chromatographic and mass-spectrometric techniques. The acute and chronic toxicities of IMI and its TPs to different aquatic organisms were evaluated with Microtox bioassay and the ECOSAR program, which indicate that some TPs (e.g., TP 2 –TP 5 and TP 7 –TP 9 ) are even more toxic than IMI to aquatic organisms (e.g., daphnia). The results of this study suggest that IMI along with its TPs should be sufficiently abated during water treatment, and the E-peroxone process provides an efficient option to upgrade conventional ozonation for enhanced IMI abatement.
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DOI
高影响因子
危险品化学品经营许可证（带存储）