CROP PROTECTION
·
2020
·
IF 2.381
Guanglong Ding,Jingyue Tang,Wenbing Zhang,Yanran Li,Junfan Niu,Weichen Wang,Hong Huo,Jianqiang Li,Yongsong Cao
Auxinic herbicides are widely used to control broadleaf weeds in cereal crop fields due to their excellent herbicidal activities. However, volatile drifting caused by their high vapor pressures is a great threat to neighbouring susceptible crops and environment and severely limits auxinic herbicide applications. In this study, a series of auxinic herbicide dimers were synthesized using 2,4-D, dicamba and MCPA as monomers to reduce their vapor pressures. The results showed that all of the dimers significantly reduced volatilities due to larger molecular weight. The dimers linked with two ester bonds had 2-fold higher herbicidal efficacies than their corresponding monomers in filed experiments. The dimers linked with amide bonds appeared to function as contact action and systemic action herbicides. The dimers, 3a-2(ethane-1,2-diylbis (2-(2,4-dichlorophenoxy)acetate)), 3a-4(2-((2-(2,4-dichlorophenoxy)acetyl)thio)ethyl 2-(2,4-dichlorophenoxy)acetate), 3b-2(ethane-1,2-diylbis(2-(4-chloro-2-methylphenoxy)acetate)) and 3c-2(ethane-1,2-diylbis(3,6-dichloro-2-methoxybenzoate)) significantly increased the efficacies and reduced volatilities, thus could be developed as potential novel postemergence herbicides.
研究领域:
植物学
·
农业科学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2015
·
IF 2.746
Qiaoxuan Zhang,Verónica Gil,Elena Sánchez-López,María Ángeles García,Zhengjin Jiang,María Luisa Marina
The use of agrochemicals as pure enantiomers avoids the presence of non-active pesticide compounds in the environment. The quality control of these agrochemicals requires the development of new chiral methodologies. In this work, the performance of the monolithic column named poly(O-9-[2-(methacryloyloxy)-ethylcarbamoyl]-10,11-dihydroquinidine-co-2-hydroxyethyl methacrylate-co-ethylene dimethacrylate) (poly(MQD- co -HEMA- co -EDMA)) was assessed as stationary phase for the enantiomeric separation of seven phenoxy acid herbicides (dichlorprop, 2-(4-chlorophenoxy)propionic acid, 2-(3-chlorophenoxy)propionic acid, mecoprop , fenoprop, 2-phenoxypropionic acid, and fenoxaprop) in a nano-liquid chromatography (nano-LC) system. Under optimized conditions (60/40 ( v/v ) ACN/0.1 M ammonium acetate (pH 6.0) at a flow rate of 20 μL/min), it was possible to obtain baseline separation for most of the studied compounds. The analysis of an enantiomerically pure mecoprop commercial herbicide sample which also contained three achiral phenoxy acid herbicides (MCPA, 2,4-D and dicamba) commonly present in these kinds of formulations showed that the use of a 80/20 ( v/v ) ACN/0.1 M ammonium acetate (pH 5.3) enabled the simultaneous separation of these compounds and mecoprop enantiomers in less than 8 min. The analytical characteristics of the methodology were evaluated in terms of selectivity, linearity, precision, accuracy, LOD, and LOQ. Results demonstrated that determined amounts of R-mecoprop in commercial formulations were in agreement with the labeled content and the enantiomeric impurity was below the LOQ. The poly(MQD- co -HEMA- co -EDMA) capillary monolithic column exhibits great potential as a useful and environmental-friendly tool for the quality control of agrochemicals by nano-LC.
研究领域:
分析化学
·
环境科学
·
药学
✓ 已验证
产品关联
DOI
高影响因子
Rhizosphere
·
2024
·
IF 3.4
Tengteng Shao,Huaqing Liu,Aiyun Guo,Dongle Cheng,Xinhan Chen,Shugang Hu,Jian Zhang
Rhizosphere microorganisms are crucial for the growth and health of their host plants. Dicamba is one of the representative herbicides used for the control of wheat weeds. In recent years, the usage of dicamba has escalated globally, particularly with the advent of dicamba-tolerant transgenic crops. However, the impacts of this herbicide on non-target organisms, particularly the rhizosphere microorganisms of wheat, is not yet clear. Furthermore, rhizosphere microorganisms are important for nitrogen cycling in soil-crop systems, the influence of dicamba on rhizosphere nitrogen cycling functionality needs further investigation. This study aims to elucidate the effects of dicamba on the microbial community, metabolite profiles, and nitrogen cycling-related genes in wheat rhizosphere. Our findings indicated that dicamba led to significant alterations in the diversity and co-occurrence patterns of the rhizosphere microbial community, notably reducing the abundances of phyla Verrucomicrobia, Planctomycetes, and Cyanobacteria. Additionally, dicamba markedly disturbed the rhizosphere metabolite profiles, particularly those associated with carbohydrate and amino acid metabolism. Notably, dicamba treatment resulted in an up-regulation of enzymatic genes catalyzing processes of assimilatory nitrate reduction to ammonium (ANRA)/dissimilatory nitrate reduction to ammonium (DNRA) (EC: 1.7.5.1, EC: 1.9.6.1, and EC: 1.7.1.15) and denitrification (EC: 1.7.2.1 and EC: 1.7.2.5). The observed increases in the abundances of the genera Cellulosimicrobium and Pseudomethylobacillus were critical for facilitating ANRA and DNRA. The application of dicamba altered soil organic matter content, which in turn influenced the abundances of microorganisms involved in ANRA/DNRA and denitrification, thereby affecting the nitrogen cycling functionality in the rhizosphere. This study offers valuable theoretical support for assessing the rhizosphere ecological effects of agrochemical application.
研究领域:
环境微生物学
·
土壤学
·
农学
·
生态学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Jiaxiao Niu,Yanhui Zhang,Hongbo Li,Xiaoqin Hai,Qingxin Lu,Ruiyu Fu,Tingze Ren,Xiaoli Guo,Xin Di
In this work, a switchable deep eutectic solvent (SDES) based on fatty acid and polyetheramine ion pair was prepared for liquid-phase microextraction (LPME) of phenoxyacetic acid herbicides in drinking water, beverage and honey matrices. The as-synthesized SDES equipped with an interesting characteristic of fast and reversible polarity switching, achieving homogeneous extraction and rapid bi-phase separation simultaneously. Several key parameters affecting the extraction performance were investigated comprehensively by Box-Behnken design. Under the optimal conditions, the method exhibited excellent linearity (15–4000 μg L −1 ), low detection limits (3–5 μg L −1 ), desirable precision (RSD < 8.1 %), and satisfactory recovery (72.6–98.7 %). More importantly, the introduction of SDES can simplify the pre-treatment procedure, shorten extraction time (4 min), and avoid the usage of traditional organic solvent during the whole extraction process. In addition, the switching mechanism of SDES was characterized by FT-IR and 1 H NMR, and the forming mechanism of SDES was investigated using density-functional theory. The green of the method was estimated using the analytical ecological scale, the analytical green calculator, and the green analytical procedure index. The cytotoxicity of SDES was investigated and the result displayed that toxicity of the SDES was very low with the EC 50 > 500 mg/L. Therefore, the proposed method was green and efficient and revealed considerable application prospects for the extraction of trace analytes from complex materials.
研究领域:
环境科学
·
分析化学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2024
·
IF 5.7
Jingyu Zhang,Huihui Hu,Jian Wang,Keqiang Lu,Yunyun Zhou,Lingzhi Zhao,Juanjuan Peng
Herbicides have been extensively used around the world, which poses a potential hazard to humans and wildlife. Accurate detection of herbicides is crucial for the environment and human health. Herein, a simple and sensitive fluorescence sensor array was constructed for discrimination and identification of herbicides. Fluorescent gold nanoclusters modified with 11-mercaptoundecanoic acid or reduced glutathione were prepared, respectively. Metal ions quenched the fluorescence of nanoclusters through coordination and leading to the aggregation of gold nanoclusters. The addition of auxin herbicides (2,4-dichlorophenoxyacetic acid, 2-methyl-4-chlorophenoxyacetic acid, decamba, picloram, quinclorac) restored the fluorescence of nanoclusters with different degrees. The mechanism study showed auxin herbicides can bind with metal ions and re-disperse the gold nanoclusters from the aggregation state. The "on-off-on" fluorescent sensor array was constructed basic on above detection mechanism. Combined with principal component analysis (PCA) and hierarchical cluster analysis (HCA) methods, auxin herbicides are well separated on 2D/3D PCA score plots and HCA dendrogram in the range of 40–500 μm. In addition, the fluorescence sensor array performed successful in detecting real samples and blind samples. The developed sensor system shows a promising in practical detection of herbicides.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2019
·
IF 3.206
Xiaoli Guo,Yanting Li,Bo Zhang,Lingling Yang,Xin Di,Xin Di
Herein, magnetic nanoparticle coated with zinc-aluminum layered double hydroxide was successfully synthesized and characterized. The nanocomposite was used as an effective adsorbent to extract three phenoxy acid herbicides in water samples prior to high performance liquid chromatography-ultraviolet detection. An interesting characteristic of this sorbent is that it dissolves under acidic solution (pH < 4). As a result, the elution step was unnecessary, and no organic solvent was used in whole extraction process. Influential extraction factors such as pH of solution, amount of sorbent, type and volume of acidic solution and vortex time were optimized. The method displays low limits of detection (0.1−0.2 ng mL −1 ), good linearity (0.5−200 ng mL −1 ), acceptable precision (relative standard deviations were less than 9.3%) and accuracy (98.9–106.1%). Therefore, the method is sensitive, fast, eco-friendly, and suitable for determination of phenoxy acid herbicides in water samples.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 25
·10654-10661
·
IF 3.288
Qi Wu,Wei Wu,Xue Zhan,Xiudan Hou
A simple, facile method was adopted to synthesize three-dimensional chitosan grafted graphene oxide aerogel modified silica (3D CS/GOA@Sil) as an eco-friendly, sustainable extraction material for the preconcentration of phenoxy acid herbicides. An amidation reaction realized the immobilization of CS and GO on the surface of silica, which was followed by a freeze-drying technique to yield the CS/GOA@Sil with 3D architecture structure. The successful synthesis and properties of 3D CS/GOA@Sil were characterized and confirmed by using scanning electron microscopy, infrared spectroscopy, BET adsorption–desorption analysis, and thermogravimetric analysis. The surface area of 3D CS/GOA@Sil was twice that of the individual GO@Sil. Besides, the adsorption and extraction times were also shorter due to the ordered porous structure and rapid mass transfer. Under the optimal conditions, coupled with a high-performance liquid chromatography-ultraviolet detector, this as-established method presented wide linearities with desirable correlation coefficients (≥0.9936) and low limits of detection (≤1.5 μg L−1). Finally, it was applied in the analysis of phenoxy acid herbicides in vegetables, and satisfactory relative recoveries of 62.38–102.92% of spiked standard solutions with different concentrations were obtained.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2020
·
IF 4.049
Xiudan Hou,Hui Yu,Shihai Yan,Junxia Xiao,Min Sun,Wei Wu
The facile preparation and characterization of a cationic polyelectrolyte (polydiallyldimethylammonium chloride, PDDA) fabricated graphene oxide-grafted silica microsphere (PDDA@GO@Sil) with high positive charge density as the sorbent for the high selective capture of acidic herbicides were reported. The theoretical calculation showed that there were strong adsorption energies between the PDDA and analytes, and the main interaction was the hydrogen bonding from O H…Cl and C O…H C. Static- and dynamic- state adsorption results indicated that acidic herbicides were the monolayer coverage onto the PDDA@GO@Sil due to the electrostatic attraction between the sorbent and analytes, and electrostatic repulsion among analytes. Under the optimized conditions obtained with the single-factor experiment and response surface methodology, this established method was used for the enrichment and determination of herbicides in two vegetables. Method detection limits were in the range of 0.75–1.50 µg L −1 indicating that the introduction of PDDA provided the excellent extraction capacity toward acidic herbicides. The obtained results exhibited that the developed method was feasible, reliable, selective and accurate for the determination of acidic herbicides in real samples.
研究领域:
分析化学
·
环境科学
·
农业科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Yaqing Chang,Zhe Zhang,Jinhui Hao,Wenshu Yang,Jilin Tang
The detection of glyphosate (Glyp) in water is of increasing importance because of its potential danger to environmental and health. In this study, a simple and label free colorimetric method for Glyp detection is proposed based on the inhibition of peroxidase-like activity of Cu 2+ . Cu 2+ possesses the peroxidase-like activity that could catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) to oxidized TMB (oxTMB) in the presence of H 2 O 2 , resulting in a color change of the solution. However, the peroxidase-like activity of Cu 2+ could be strongly hindered by Glyp due to the formation of Glyp–Cu 2+ complexes. The color change of the solution or the absorbance change of oxTMB is utilized to monitor the concentration of Glyp. The linear range of the proposed method is 2–200 μM and the detection limit is 1 μM. Furthermore, as low as 10 μM Glyp can be clearly distinguished by naked eyes. Also, this proposed method is successfully applied for screening Glyp in real samples and shows great promise for environmental monitoring owing to its simplicity, rapidness and high selectivity.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Zhuoyue Wang,Ji Li,Wei Song,Rui Ma,Jingxin Yang,Xiaolei Zhang,Fan Huang,Wenyi Dong
Recently, (bi)sulfite as the precursor of SO x − generation has drawn significant attention in advance oxidation process based on SO 4 − (SR-AOP) due to its low cost and conforming to waste utilization. The current activation on (bi)sulfite mainly employs the transition metals and their composite materials, which limited its application. In this study, chlorine dioxide (ClO 2 ) was employed to activate bisulfite (BS). It was found that the dominant radicals in BS/ClO 2 process were ClO and SO 4 − according to scavenger experiments and ESR detection. To investigate the performance of the established BS/ClO 2 system, atrazine (ATZ) was used as target pollutant. The degradation efficiency of ATZ reached 86.8% within 3 min and nearly half of the degradation occurred at the first 10 s. The optimum ClO 2 dosage for the ATZ degradation was 100 μM when the BS dosage was 200 μM. The effects of pH, temperature and coexisting substances including halide ions, bicarbonate ion and humic acid on ATZ degradation by BS/ClO 2 were investigated. It is predicted that the degradation pathway of ATZ in this study involved olefination, dealkylation and the combination of dichlorination with hydroxylation according to the final products identified after degradation. The system has also shown the ability on degradation of four pharmaceuticals and personal care products (PPCPs) including ibuprofen, bisphenol A, sulfamethoxazole and carbamazepine. This study reveals that ClO 2 is capable of activating BS and provides a method for effectively degrading refractory organic contaminants .
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2022
·
IF 9.988
Wei Song,Caixia Fu,Yuning Fang,Zhuoyue Wang,Ji Li,Xiaolei Zhang,Kalpana Bhatt,Lu Liu,Ningjie Wang,Fang Liu,Shunni Zhu
Microplastics (MPs), an emerging pollutant, have been increasingly raising concern due to the potential impacts on aquatic organisms. Moreover, the environmental aged MPs always exhibit different environmental behavior and interaction effect with organic pollutants from virgin MPs. In this work, the single and combined toxicity impact on Chlorella pyrenoidosa , a symbiont representative, has been investigated between MPs (e.g., polyamide microplastic (PA6), 75 μm) and organic pollutants (e.g., sulfamethoxazole (SMX) and dicamba (DCB)). Growth inhibition, chlorophyll accumulation, superoxide dismutase (SOD), malondialdehyde (MDA), and catalase (CAT) were investigated with the primary or UV-aged PA6. Above 0.5 g/L PA6 (primary or UV-aged) inhibited cell growth and chlorophyll accumulation after 96 h cultivation as compared with the control. Besides, the inhibition impacts have enhanced as the UV-aging time extending in the single PA6 systems. The algae growth inhibition rate after 96 h cultivation in both the system i.e., single (PA6: 6.9%) and combined (PA6-SMX: 14.2%, PA6-DCB: 14.9%) was slightly lower than that of exposing in organic pollutants alone (SMX: 23.9%, DCB: 25.0%), while the chl. b concentration in 60 days UV-aged PA6 combined with SMX (1.19 mg/L) or DCB (1.40 mg/L) systems were higher than in single SMX (1.04 mg/L) or DCB (1.33 mg/L) system. In addition, there were several differences of the cellular oxidative stress in the combined system of SMX and DCB. Specially, it was not noticeable of three enzymatic activities for SMX exposing in the presence of primary or UV-aged PA6. While SOD, CAT, and MDA activities was obviously increasing after exposing in PA6 and DCB combined system, indicating the significant synergistic effect on algae cells damage. This research verified the remarkable combined toxicity between UV-aged MPs and organic pollutants on microalgae.
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
危险品化学品经营许可证（带存储）