keyword
https://read.qxmd.com/read/38529545/pesticide-identification-using-surface-enhanced-raman-spectroscopy-and-density-functional-theory-calculations-from-structural-insights-to-on-site-detection
#1
JOURNAL ARTICLE
Andrea Hermsen, Florian Hertel, Dominik Wilbert, Till Gronau, Christian Mayer, Martin Jaeger
Pesticides play an important role in conventional agriculture. Yet, their harmful effects on the environment are becoming increasingly apparent. The occurrence of pesticides is hence being monitored worldwide. For fast, easy, yet sensitive identification, surface-enhanced Raman spectroscopy (SERS) is a powerful tool. In this study, a method is introduced that may be amended to in-field detection of pesticides. Gold and silver nanoparticles were synthesized, size-tailored, and characterized. The herbicide paraquat and the fungicide thiram served as model compounds...
March 26, 2024: Applied Spectroscopy
https://read.qxmd.com/read/38528918/surface-ligand-modified-silver-nanoparticles-based-sers-sensing-platform-for-ultrasensitive-detection-of-the-pesticide-thiram-in-green-tea-leaves-roles-of-coating-agents-in-sensing-performance
#2
JOURNAL ARTICLE
Dong Thi Linh, Quan-Doan Mai, Dao Thi Nguyet Nga, Nguyen Tuan Anh, Hoang Van Tuan, Ha Anh Nguyen, Xuan Hoa Vu, Anh-Tuan Le
Silver nanoparticles (AgNPs) have been regarded as a highly promising substrate for surface-enhanced Raman scattering (SERS) sensors. In this study, we focused on the electrochemical synthesis method by developing three kinds of AgNPs using three different electrolytes: citrate (e-Ag-C), oleic acid (e-Ag-O) and fish mint ( Houttuynia cordata Thunb.) extract (e-Ag-bio). The as-prepared AgNPs were characterized and then employed as SERS substrates to detect the pesticide thiram. The obtained results show that e-Ag-O exhibits the best SERS performance...
March 20, 2024: RSC Advances
https://read.qxmd.com/read/38450563/a-core-shell-structured-aunps-znco-mof-sers-substrate-for-sensitive-and-selective-detection-of-thiram
#3
JOURNAL ARTICLE
Wenxia Xue, Jihong Fu, Yaxue Zhang, Shuxian Ren, Guoqi Liu
Surface-enhanced Raman scattering (SERS) enables pesticide residue monitoring to become facile and efficient. In this study, a core-shell structured gold nanoparticles@ZnCo metal-organic framework (AuNPs@ZnCo-MOF) SERS substrate was designed and successfully synthesized for efficient and selective detection of thiram. The bimetallic ZnCo-MOF shell can not only enrich the targeted molecules in the electromagnetic field because of its excellent absorptive capacity, but also act as a stabilized matrix for protecting the AuNPs from aggregation...
March 7, 2024: Analytical Methods: Advancing Methods and Applications
https://read.qxmd.com/read/38447363/self-assembled-c-ag-hybrid-nanoparticle-on-nanoporous-gan-enabled-ultra-high-enhancement-factor-sers-sensor-for-sensitive-thiram-detection
#4
JOURNAL ARTICLE
Hongpeng Zhou, Jiaoyan Qiu, Yunhong Zhang, Yanbo Liang, Lin Han, Yu Zhang
Considering pesticide residues cause significant harm to public health and the environment, developing a simple, sensitive, and reliable approach to pesticide residue detection to address this issue is necessary. In this study, an ultrasensitive and reliable surface-enhanced Raman scattering (SERS) sensor was developed using cetylpyridinium chloride as a protecting and reducing agent for the in situ synthesis and self-assembly of C-Ag nanoparticles on nanoporous GaN for the quantitative detection of thiram...
February 24, 2024: Journal of Hazardous Materials
https://read.qxmd.com/read/38417796/g-site-residue-s67-is-involved-in-the-fungicide-degrading-activity-of-a-tau-class-glutathione-s-transferase-from-carica-papaya
#5
JOURNAL ARTICLE
Su-Yan Wang, Yan-Xia Wang, Sheng-Shuo Yue, Xin-Chi Shi, Feng-Yi Lu, Si-Qi Wu, Daniela D Herrera-Balandrano, Pedro Laborda
Thiram is a toxic fungicide extensively used for the management of pathogens in fruits. Although it is known that thiram degrades in plant tissues, the key enzymes involved in this process remain unexplored. In this study, we report that a tau class glutathione S-transferase from Carica papaya (TCpGST) can degrade thiram. This enzyme was easily obtained by heterologous expression in E. coli, showed low promiscuity towards other thiuram disulfides, and catalyzed thiram degradation under physiological reaction conditions...
February 26, 2024: Journal of Biological Chemistry
https://read.qxmd.com/read/38416014/octahedron-in-a-cubic-nanoframe-strong-near-field-focusing-and-surface-enhanced-raman-scattering
#6
JOURNAL ARTICLE
Myeong Jin Oh, Sunwoo Kwon, Sungwoo Lee, Insub Jung, Sungho Park
Here, we describe the synthesis of a plasmonic particle-in-a-frame architecture in which a solid Au octahedron is enclosed by a Au cubic nanoframe. The octahedra are positioned inside and surrounded by outer Au cubic nanoframes, creating intra-nanogaps within a single entity. Six sharp vertexes in the Au octahedra point toward the open (100) facets of the cubic nanoframes. This allows not only efficient interactions with the surroundings but also tip-enhanced electromagnetic near-field focusing at the sharp tips of the octahedra, combined with intraparticle coupling...
February 28, 2024: ACS Nano
https://read.qxmd.com/read/38387315/sers-imaging-investigation-of-the-removal-efficiency-of-pesticide-on-vegetable-leaves-by-using-different-surfactants
#7
JOURNAL ARTICLE
Sugui Fang, Li Fan, Yulian Niu, Guoshuai Jiao, Haidong Jia, Feng Wang, Haifeng Yang, Yan Kang
Pesticide residues on vegetables could be removed by commercial detergents to guarantee food safety, but the removal efficiencies of different formulations of detergents need to be further investigated. In this work, surface enhanced Raman scattering (SERS) imaging method due to its good space resolution as well as high sensitivity is used to track the thiram residue, and evaluate the pesticide removing efficiencies by mixtures of several surfactants at different ratios. Sodium linear alkylbenzene sulphonate-alkyl glycoside (LAS-APG) with the ratio at 5:5 and the concentration at 0...
February 10, 2024: Food Chemistry
https://read.qxmd.com/read/38342254/preparation-of-cellulose-based-flexible-sers-and-its-application-for-rapid-and-ultra-sensitive-detection-of-thiram-on-fruits-and-vegetables
#8
JOURNAL ARTICLE
Haonan Wang, Yujia Chen, Yixuan Yang, Peipei Xu, Bohan Zhang, Yudong Lu, Wenjin He, Yunzhen Liu, Jian-Han Zhang, Xiufeng Xiao, Ruiyun You
In response to the prevalent issue of thiram as a common pesticide residue on the surface of fruits and vegetables, our research team employed an acidic hydrated metal salt low co-fusion solvent to dissolve cellulose lysis slurry. Subsequently, a regenerated cellulose membrane (RCM) was successfully prepared via sol-gel method. Uniformly sized Ag nanoparticles (NPs) were deposited on RCM utilizing the continuous ion layer adsorption and reaction (SILAR) technique. The resulting Ag NPs/RCM flexible surface-enhanced Raman spectroscopy (SERS) substrates exhibited a minimum detection limit of 5 × 10-9  M for Rhodamine 6G (R6G), demonstrating good uniformity (RSD = 4...
February 9, 2024: International Journal of Biological Macromolecules
https://read.qxmd.com/read/38330862/effects-of-commonly-used-carbamates-carbaryl-and-thiram-on-the-regulatory-secretory-and-motor-functions-of-bovine-cervixes-in-vitro
#9
JOURNAL ARTICLE
Michal Hubert Wrobel, Jaroslaw Mlynarczuk, Robert Rekawiecki
Previously studied classes of pesticides, including organochlorines, organophosphates and pyrethroids disturb the mechanism that causes bovine myometrial contractions. Hence, the aim of this study was to investigate the effects of carbaryl and thiram, which are representative carbamate pesticides commonly used in global agriculture, on the motor and secretory functions of bovine cervixes. Additionally, the impacts of these pesticides on intra- and intercellular signaling in vitro were estimated. In this study, cervical cells or strips were obtained from cows at days 18-20 of the estrous cycle and were treated with carbaryl or thiram...
January 26, 2024: Theriogenology
https://read.qxmd.com/read/38306966/increasing-gold-nanostars-sers-response-with-silver-shells-a-surface-based-seed-growth-approach
#10
JOURNAL ARTICLE
Miriam Parmigiani, Veronica Schifano, Angelo Taglietti, Pietro Galinetto, Benedetta Albini
A straightforward method to prepare SERS chips containing a monolayer of silver coated gold nanostars (GNS@Ag) grafted on a glass surface is introduced. The synthetic approach is based on a seed growth method performed directly on surface, using GNS as seeds, and involving a green pathway, which only uses silver nitate, ascorbic acid and water, to grow the silver shell. The preparation was optimized to maximize signals obtaining a SERS response of one order of magnitude greater than that from the original GNS based chips, offering in the meantime good homogeneity and acceptable reproducibility...
February 2, 2024: Nanotechnology
https://read.qxmd.com/read/38290277/synergy-of-shaped-induced-enhanced-raman-scattering-to-improve-surface-enhanced-raman-scattering-signal-in-the-thiram-molecule-detection
#11
JOURNAL ARTICLE
Jaciara Bär, Anerise de Barros, Flavio Makoto Shimizu, Fernando A Sigoli, Carlos César Bof Bufon, Italo Odone Mazali
Herein, we explore the combined effect of Shaped-Induced Enhanced Raman Scattering (SIERS) and Surface-Enhanced Raman Scattering (SERS) for detecting thiram molecules. We fabricated V-shaped microchannels on a silicon (100) substrate through a standard lithography and etching process. The analysis of SIERS@SERS was performed for Si-V substrates modified with AuNRs with different thiram concentrations, 10-7 to 10-10 mol/L. The spectra were collected for different regions of the Si-V substrates, i.e., in the inside, edge, between (flat top), and far from Si-V (coffee-ring AuNRs aggregation) to assess the performance of Si-V microchannels obtained...
January 17, 2024: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://read.qxmd.com/read/38280460/3d-suspension-culture-platform-for-high-throughput-screening-of-neurotoxic-chemicals-using-luhmes-dopaminergic-neurons
#12
JOURNAL ARTICLE
Zhi-Bin Tong, Ruili Huang, John Braisted, Pei-Hsuan Chu, Anton Simeonov, David L Gerhold
Three-dimensional (3D) cell culture in vitro promises to improve representation of neuron physiology in vivo. This inspired development of a 3D culture platform for LUHMES (Lund Human Mesencephalic) dopaminergic neurons for high-throughput screening (HTS) of chemicals for neurotoxicity. Three culture platforms, adhesion (2D-monolayer), 3D-suspension, and 3D-shaken, were compared to monitor mRNA expression of seven neuronal marker genes, DCX, DRD2, ENO2, NEUROD4, SYN1, TH, and TUBB3. These seven marker genes reached similar maxima in all three formats, with the two 3D platforms showing similar kinetics, whereas several markers peaked earlier in 2D adhesion compared to both 3D culture platforms...
January 25, 2024: SLAS Discovery
https://read.qxmd.com/read/38259149/constructing-graphene-oxide-au-nanoparticle-cellulose-membranes-for-sers-detection-of-mixed-pesticide-residues-in-edible-chrysanthemum
#13
JOURNAL ARTICLE
Zhilei Zhao, Mingshuo Cao, Dizhe Wei, Xiangyang Li, Meng Wang, Wenlei Zhai
Edible chrysanthemum is widely cultivated and used as an important ingredient of medicine, tea and multifunctional food. During the planting of chrysanthemum, pesticides are extensively used for preventing plant diseases and insect pests. To ensure the food safety of edible chrysanthemum, rapid detection methods are urgently needed for on-site inspection. In this study, a graphene oxide/Au nanoparticle (GO/Au NP) cellulose substrate was prepared through layer-by-layer assembly of GO and Au NPs on a mixed cellulose ester membrane...
January 23, 2024: Analyst
https://read.qxmd.com/read/38218498/silver-nanoparticle-coated-fe-3-o-4-chitosan-core-shell-microspheres-for-rapid-and-ultrasensitive-detection-of-thiram-using-surface-magnetic-solid-phase-extraction-surface-enhanced-raman-scattering-smspe-sers
#14
JOURNAL ARTICLE
Qijia Zhang, Xiaodi Ma, Xiaoyu Du, Peng Song, Lixin Xia
We report a surface magnetic solid-phase extraction-surface-enhanced Raman scattering (SMSPE-SERS) method based on silver-nanoparticle-coated Fe3 O4 /chitosan (Fe3 O4 /CS@Ag) microspheres as the substrate, and this method integrates all steps from sample pretreatment to detection. Fe3 O4 /CS was synthesized by a one-step solvothermal method in which chitosan (CS) was used as a surface modifier and adsorbent. Fe3 O4 /CS@Ag microspheres exhibit both adsorption ability and SERS activity. Therefore, we used the SMSPE-SERS method to detect pesticide residues on fruit peel...
January 11, 2024: Science of the Total Environment
https://read.qxmd.com/read/38185049/green-and-sustainable-self-cleaning-flexible-sers-base-utilized-for-cyclic-detection-of-residues-on-apple-surface
#15
JOURNAL ARTICLE
Zhiyang Chen, Yue Sun, Xinai Zhang, Ye Shen, Shaden A M Khalifa, Xiaowei Huang, Jiyong Shi, Zhihua Li, Xiaobo Zou
Advances in flexible SERS substrates has made it possible to approach the ultimate goal of rapid in-situ monitoring of fruit and vegetable safety, but its vulnerability under laser ablation results in low utilization. In order to solve this problem, a 3D framework of TiO2 -doped PVDF\PVP polymer was utilized to self-assemble gold-silver core-shell nanorods (Au@Ag NRs) to prepare a flexible SERS substrate with good physical stability and self-cleaning properties. This substrate showed excellent detection limit and recyclability after the detection of three pesticide residues in apple peel...
January 3, 2024: Food Chemistry
https://read.qxmd.com/read/38165426/pde3b-regulates-krt6b-and-increases-the-sensitivity-of-bladder-cancer-cells-to-copper-ionophores
#16
JOURNAL ARTICLE
Yuankang Feng, Zhenlin Huang, Liang Song, Ningyang Li, Xiang Li, Huihui Shi, Ruoyang Liu, Fubo Lu, Xu Han, Yafei Ding, Yinghui Ding, Jun Wang, Jinjian Yang, Zhankui Jia
Cuproptosis is a new Cu-dependent programmed cell death manner that has shown regulatory functions in many tumor types, however, its mechanism in bladder cancer remains unclear. Here, we reveal that Phosphodiesterase 3B (PDE3B), a cuproptosis-associated gene, could reduce the invasion and migration of bladder cancer. PDE3B is downregulated in bladder cancer tissues, which is correlated with better prognosis. Conversely, overexpression of PDE3B in bladder cancer cell could significantly resist invasion and migration, which is consistent with the TCGA database results...
January 2, 2024: Naunyn-Schmiedeberg's Archives of Pharmacology
https://read.qxmd.com/read/38157796/low-dose-thiram-exposure-elicits-dysregulation-of-the-gut-microbial-ecology-in-broiler-chickens
#17
JOURNAL ARTICLE
Lei Wang, Fazul Nabi, Weixue Yi, Dongjing Wang, Ying Zhu, Xiong Jiang
Thiram, a typical fungicide pesticide, is widely used in agricultural production. The presence of thiram residues is not only due to over-utilization, but is also primarily attributed to long-term accumulation. However, there is a paucity of information regarding the impact of prolonged utilization of thiram at low doses on the gut microbiota, particularly with respect to gut fungi. Our objective is to explore the effect of thiram on broilers from the perspective of gut microbiota, which includes both bacteria and fungi...
December 28, 2023: Ecotoxicology and Environmental Safety
https://read.qxmd.com/read/38138109/identification-of-fungicide-combinations-for-overcoming-plasmopara-viticola-and-botrytis-cinerea-fungicide-resistance
#18
JOURNAL ARTICLE
Junrui Zhang, Jhulia Gelain, Guido Schnabel, Samavath Mallawarachchi, Haoqi Wang, Nirmitee Mulgaonkar, Raghupathy Karthikeyan, Sandun Fernando
Fungal diseases, including downy mildew (caused by Plasmopara viticola ) and gray mold (caused by Botrytis cinerea ), significantly impact the marketable yield of grapes produced worldwide. Cytochrome b of the mitochondrial respiratory chain of these two fungi is a key target for Quinone outside inhibitor (QoI)-based fungicide development. Since the mode of action (MOA) of QoI fungicides is restricted to a single site, the extensive usage of these fungicides has resulted in fungicide resistance. The use of fungicide combinations with multiple targets is an effective way to counter and slow down the development of fungicide resistance...
December 12, 2023: Microorganisms
https://read.qxmd.com/read/38105219/identifying-and-controlling-anthracnose-caused-by-colletotrichum-taxa-of-welsh-onion-in-sanxing-taiwan
#19
JOURNAL ARTICLE
Yu-Hsiang Yu, Yi-Tun Cho, Yuan-Cheng Xu, Zhang-Jian Wong, Yi-Chen Tsai, Hiran Ariyawansa
From 2018 to 2020, anthracnose symptoms were observed throughout Welsh onion fields in northern Taiwan, mainly the Sanxing area. In total, 33 strains of Colletotrichum species were isolated from diseased leaves, and major causative agents were identified based on a multi-locus phylogenetic analysis using four genomic regions (act, tub2, gapdh, and ITS. Based on this phylogeny, Colletotrichum species causing anthracnose of Welsh onion were identified as C. spaethianum (C. spaethianum species complex), and C...
December 17, 2023: Phytopathology
https://read.qxmd.com/read/38085971/-bipolaris-fujianensis-sp-nov-an-emerging-pathogen-of-saplings-shoot-blight-on-chinese-fir-and-its-sensitivity-to-fungicides
#20
JOURNAL ARTICLE
Qinghua Zhang, Yuhan Meng, Wenbao Zhao, Qianqian Wang, Xiaoting Wang, Lili Xue, Xiaochen Xu, Chunli Chen
Chinese fir is an extremely important economic tree species in southern China. In recent years, 74.5% of Chinese fir saplings suffered from shoot blight in Shunchang County, Nanping City, Fujian province, China. Seventeen isolates were collected from rotten shoots, and their pathogenicity was confirmed following Koch's postulate. The five pathogenic isolates were identified as genus Bipolaris based on morphological characteristics, including septate and geniculate conidiophores, conidiogenous nodes smooth to slightly verruculose, dematiaceous phragmospore conidia, oblong or fusiform conidia, and slightly protruding or truncate hilum on conidia, but number of pseudosepta (3 to 11, most 5 to 8) and size of conidia (22...
November 1, 2023: Plant Disease
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