Article
Chemistry, Applied
Jiale Zhang, Caijun Wu, Ruo Yuan, Jian-An Huang, Xia Yang
Summary: This study reports a subtle surface-enhanced Raman scattering (SERS) substrate for detecting the dithiocarbamate fungicide Thiram. By controlling the inter-particle spacing of gold-silver-gold nanoparticles, a remarkable enhancement of Raman signal and stability was achieved. This method holds potential for rapid assessment and identification of pesticides on foods.
Article
Spectroscopy
Mingchun Lv, Hongbin Pu, Da-Wen Sun
Summary: This study constructed a new SERS substrate Fe3O4@UiO-66(Zr)@Ag nanoparticles (FUAs) with excellent SERS detection sensitivity, uniformity, reproducibility, and stability. It exhibited a high Raman enhancement factor (5.62 x 106), low limit of detection (LOD, 2.11 x 10-11 M), and RSD (12.41%) for 4-NBT, while maintaining 81% SERS activity within 60 days. FUAs took advantage of the strong affinity of UiO-66(Zr) for organophosphorus pesticides (OPs) to achieve trace OPs detection, showing potential for detecting OPs in foods.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Chemistry, Applied
Feng Bai, Jinchen Dong, Tangchun Wang, Jianbo Qu, Zhiliang Zhang
Summary: Pesticide residues in fruit and vegetable pose a significant threat to human health. A new method utilizing WPU@AgNPs sticky tapes was developed for rapid extraction and surface-enhanced Raman scattering (SERS) assay of thiabendazole residues on fruit surfaces. The WPU@AgNPs tapes, constructed by coating silver nanoparticles (AgNPs) on waterborne polyurethane (WPU) films, demonstrated excellent sensitivity using 4-Mercaptopyridine (4-Mpy) as the probe molecule. The tapes allowed for easy detection of thiabendazole residues on pear, apple, and banana surfaces, with a detection limit of 1.44, 1.12, and 1.63 ng/cm2, respectively. This strategy could be a common method for rapid, on-site, and ultra-sensitive assay of thiabendazole residues in both chemical and biological fields.
Article
Biochemical Research Methods
Shuling Xu, Min Li, Xia Li, Yanhui Jiang, Linlin Yu, Yue Zhao, Liyuan Wen, Qingwang Xue
Summary: In this study, a biosensor based on Ag/Au bimetallic nanoparticles was developed for simple and sensitive in situ detection of organophosphorus pesticide residues in food. The combination of AChE and CHO, along with the use of Ag/Au bimetallic nanoprobes as SERS signal probes, allowed for high sensitivity and stability. The method does not require complicated pretreatments and employs readily available reagents, showing great potential for in situ detection of organophosphorus pesticides in the field of food safety.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Analytical
Tuli Kang, Jingtian Zhu, Xiaojun Luo, Wenyu Jia, Ping Wu, Chenxin Cai
Summary: An SERS-based sensor was developed for quantitatively determining let-7a miRNA in exosomes, achieving single-base specificity with a broad linear range and low detection limit. The sensor has promising applications in cancer diagnostics and therapy.
ANALYTICAL CHEMISTRY
(2021)
Article
Biophysics
Avigail Baruch-Leshem, Corinne Chevallard, Frederic Gobeaux, Patrick Guenoun, Jean Daillant, Philippe Fontaine, Michel Goldmann, Ariel Kushmaro, Hanna Rapaport
Summary: The order of the catalytic triad residues along amphiphilic beta-strands affects both assembly structures and catalytic activity. The amphiphilic peptide ESH achieved the highest catalytic efficiency at a concentration of 250 μM.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Xinyi Xu, Xinman Hu, Feiya Fu, Lin Liu, Xiangdong Liu
Summary: Polydopamine-coated cellulose nanofibers self-assembled into a 3D architecture, enhancing the flexibility and repeatability of the SERS substrate. This substrate achieved a high enhancement factor and repeatability for the quantitative detection of dye molecules.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Chemistry, Analytical
Natercia C. T. Martins, Sara Fateixa, Helena I. S. Nogueira, Tito Trindade
Summary: Fast detection of emerging contaminants in water resources is of great environmental interest. This study explores the application of chitosan-coated paper and silver nanoparticles for surface-enhanced Raman scattering (SERS) spectroscopy studies of two types of contaminants. The results show that the biocoated substrates have superior SERS performance compared to non-coated paper and successfully detect thiram and ciprofloxacin.
Article
Chemistry, Analytical
Antoine Dowek, Florent Voisin, Laetitia Le, Celine Tan, J. M. Mallet, Florent Carn, Eric Caudron
Summary: This study focuses on the improvement and control of SERS analysis by optimizing the aggregation/self-assembly of AuNPs using quaternized chitosan. The results show that the use of polyelectrolyte chains can stabilize neutral AuNPs aggregates, leading to significant enhancement of Raman signal. The stable and sensitive measurements of epinephrine at low concentrations were achieved, and the signal remained stable in complex media such as isotonic sodium chloride and glucose.
Article
Chemistry, Analytical
Jianrong Cao, Yali Huang, Ziyang Shang, Xin Liu, Chengyin Lu, Hongping Chen, Pei Liang, Guicen Ma
Summary: Three-dimensional (3D) supraparticles consisting of core-shell Au@Ag nanoparticles were successfully prepared via simple evaporation assembly. The supraparticles with non-close packed structure created numerous 3D hotspots, resulting in significantly enhanced surface-enhanced Raman scattering (SERS) performance. Compared to 3D multilayered structures assembled by Au@Ag nanoparticles, the supraparticles exhibited eight times higher enhancement for SERS behavior. Moreover, the supraparticles demonstrated excellent sensitivity and high reproducibility in detecting pesticides and antibiotics in both organic and aqueous solvents.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Nanoscience & Nanotechnology
Jun Dong, Yi Cao, Qingyan Han, Wei Gao, Tuo Li, Jianxia Qi
Summary: This paper investigates a novel hybrid SERS substrate prepared by self-assembling Au nanoparticles onto the surface of an Ag grating, enabling sensitive detection of Rh6G. Experimental results demonstrate that this hybrid substrate can significantly enhance the local electric field, with potential applications in the field of SERS sensing.
Article
Chemistry, Multidisciplinary
Juan Li, Zhenfeng Liu, Dehua Tian, Baojun Li, Lei Shao, Zaizhu Lou
Summary: This study presents a wet-chemistry approach for the fabrication of Au nanorod core-Zr-based metal-organic framework (MOF) shell nanostructures, which exhibit improved surface-enhanced Raman scattering (SERS) sensitivity and molecular enrichment capability.
Article
Chemistry, Medicinal
Ruilu Feng, Rong Ni, Ying Chau
Summary: This study highlights the importance of subtle alterations in aromatic interactions in modulating the structure and function of proteins. By changing the distance between aromatic rings and peptide backbone, as well as substituting side chains with sulfur atoms, the nanostructures and gene transfection efficiency of peptide-DNA co-assemblies were altered. Further understanding of aromatic-involving interactions can lead to deeper insights into biomaterial self-assembly mechanisms.
Article
Green & Sustainable Science & Technology
Meng He, Zhihao Li, Yujie Guo, Maofeng Zhang, Zhengdong Zhu, Xiaoyi Shi, Konghao Han, Youju Huang, Honglin Liu
Summary: Researchers demonstrated a method of shrinking three-dimensional (3D) hot spot droplets on a hydrophobic substrate for the quantitative and multiplex detection of pesticide residues using portable Raman spectrometer. The shrunk droplets, consisting of analyte solution and AgNPs sol, simultaneously increased the density of plasmonic hot spots and immobilized target molecules. The proposed strategy exhibited excellent SERS sensitivity for the analysis of pesticides down to 10(-8) m and achieved quantitative analysis and multi-component detection of pesticide residues on honeysuckle surface.
ADVANCED SUSTAINABLE SYSTEMS
(2023)
Article
Agriculture, Multidisciplinary
Yi Xu, Md Mehedi Hassan, Shujat Ali, Huanhuan Li, Qin Ouyang, Quansheng Chen
Summary: This study developed a dual-functional SERS chip for rapid detection and degradation of pesticides in tea samples, utilizing Cu2O mesoporous spheres decorated with Ag nanoparticles. Three chemometric algorithms were compared for pesticide analysis, with random frog-partial least squares showing the best performance. The prepared SERS chip also exhibited strong photocatalytic activity for pesticide degradation under visible light irradiation.
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
(2021)
Article
Environmental Sciences
Siyue Li, Jiachen Luo, Y. Jun Xu, Liuqing Zhang, Chen Ye
Summary: This study investigated the characteristics of DOM in monsoonal headwater streams of Asia using fluorescence spectroscopy, finding that allochthonous compounds dominate the DOM signal and that hydrological seasonality and nutrients play a key role in modulating DOM sources and components in these streams.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Shijie Gu, Y. Jun Xu, Siyue Li
Summary: This study assesses the effects of land use on pCO(2) dynamics in seven headwater tributary rivers in Central China. The results show that the pCO(2) level increases with stream order and exhibits seasonal variations. Riverine pCO(2) is positively related to urban and cropland percentage, while negatively related to forest land percentage. The study also finds significant relationships between pCO(2) and TN, TP, DO, and DOC concentrations in the low-order streams.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Shijie Gu, Siyue Li, Isaac R. Santos
Summary: This study investigates the CO2 emissions from monsoonal rivers in the Han River drainage to the Yangtze in China and reveals the significant impact of anthropogenic land use on riverine CO2 emissions. The findings indicate that agricultural and urban land activities contribute to increased CO2 emissions, while forest cover is negatively correlated with CO2 emissions. The study highlights the importance of considering land use in estimating riverine CO2 emissions and suggests reforestation as a strategy to improve the carbon balance of rivers.
JOURNAL OF ENVIRONMENTAL SCIENCES
(2022)
Article
Environmental Sciences
Liuqing Zhang, Y. Jun Xu, Siyue Li
Summary: Rapid urbanization significantly alters carbon biogeochemical cycle and river hydrology. This study found that urban land use increases the levels of dissolved organic matter (DOM) and its autochthonous sources in rivers. Urban-induced nutrient enrichment also contributes to the increased DOM production in rivers.
ENVIRONMENTAL RESEARCH
(2022)
Article
Environmental Sciences
Liuqing Zhang, Y. Jun Xu, Siyue Li
Summary: The sources and quality of DOM in streams are influenced by the landscape and season, and serve as good indicators of pCO2.
ENVIRONMENTAL RESEARCH
(2023)
Article
Environmental Sciences
Maofei Ni, Siyue Li
Summary: The biological degradation of DOM plays a crucial role in regulating the structure and fate of DOM in river ecosystems. In addition to labile compounds, recalcitrant compounds also contribute significantly to riverine DOM biodegradation. The incomplete degradation of refractory DOM from high-molecular to low-molecular weight compounds and the influence of elevated temperature on DOM bio-mineralization are observed. These findings provide new insights into the continuous biodegradation of DOM and its impact on carbon cycling.
JOURNAL OF ENVIRONMENTAL SCIENCES
(2023)
Article
Environmental Sciences
Xing Li, Y. Jun Xu, Maofei Ni, Chunlin Wang, Siyue Li
Summary: This study reveals the spatio-temporal variations of nitrate sources and transformations in a mixed land use/land cover catchment. It suggests that point sources dominate nitrate in the summer and winter, while non-point sources dominate in the spring and autumn. The increase in urban areas leads to an increase in nitrate concentrations from domestic sewage, and both urban and agricultural inputs should be considered in nitrate pollution management.
ENVIRONMENTAL RESEARCH
(2023)
Article
Environmental Sciences
Tianyang Li, Chuan Liang, Binghui He, Siyue Li
Summary: This study examined the effects of cornstalk mulching on the dissolved organic carbon (DOC) in runoff. The results showed significantly higher concentrations and losses of DOC in mulched plots compared to bare plots. Specifically, runoff DOC was 52.6% and 53.2% higher in mulched plots than in bare plots under 90 mm/h rainfall intensity (p<0.05).
LAND DEGRADATION & DEVELOPMENT
(2023)
Article
Engineering, Environmental
Wei Tang, Y. Jun Xu, Maofei Ni, Siyue Li
Summary: We investigated the influence of land use/land cover types on carbon dioxide and methane concentrations and diffusion in tributaries of the Longchuan River in China. Our study utilized the headspace equilibration method and CO2SYS program to analyze data collected during the dry and wet seasons from 2017 to 2019. The results showed that urban land area expansion significantly increased CO2 partial pressure, while stream order and flow velocity were inversely related to the levels of corrected pCO2 and dissolved CH4. Land use types had a stronger explanatory ability on pCO2 and dCH4 variations at the reach scale compared to the riparian and catchment scales. Moreover, urban land had a greater impact on corrected pCO2 and dCH4 compared to cropland, grassland, and forest land during the wet season. Overall, our findings emphasize the importance of considering land use at different scales when studying dissolved carbon gases in low-order streams.
Article
Environmental Sciences
Chunlin Wang, Yuhan Xv, Siyue Li, Xing Li
Summary: Urban river-lake systems are hotspots for CO2 and CH4 emissions, with higher emissions from urban rivers compared to lakes. The river-lake connection alters nutrient concentrations, affecting greenhouse gas emissions.
Article
Chemistry, Analytical
Yiguang Qian, Ziyu Chen, Jiahui Wang, Man Peng, Shenghua Zhang, Xiaoyu Yan, Xiaole Han, Xiaohui Ou, Jie Sun, Siyue Li, Ke Chen
Summary: Stable isotope-assisted metabolomics (SIAM) is a powerful tool for discovering transformation products (TPs) of contaminants. In-house H/D exchange reactions enable direct H-2 labeling to target analytes with favorable reaction conditions, providing cost-effective H-2-labeled contaminants of emerging concern (CECs). This study combines the use of in-house H/D exchange and H-2-SIAM to discover potential TPs of 6PPD and proposes a new strategy for finding TPs of CECs.
ANALYTICAL CHEMISTRY
(2023)
Article
Environmental Sciences
Liuqing Zhang, Y. Jun Xu, Bingjie Ma, Ping Jiang, Siyue Li
Summary: Urban lakes are important sources of methane emissions, especially in highly-eutrophic areas. This study measured methane concentrations and diffusion from four urban lakes in subtropical China and found that nutrient enrichment significantly increased methane concentrations and fluxes. It also revealed that urban sewage inflow is a key factor in promoting methane production and diffusive emissions. The study highlights the need for effective control measures to reduce methane emissions from urban lakes.
ENVIRONMENTAL RESEARCH
(2023)
Article
Environmental Sciences
Liuqing Zhang, Y. Jun Xu, Siyue Li
Summary: Urban lakes in Central China showed shifting patterns of CO2 source-sink dynamics influenced by algal growing season and trophic state.
ENVIRONMENTAL RESEARCH
(2023)
Article
Engineering, Civil
Yongmei Ma, Maofei Ni, Shijie Gu, Liuqing Zhang, Siyue Li
Summary: In this study, samples were collected from the Daning River, a typical karst river in the Yangtze River mountain landscapes, during both the wet and dry seasons. The molecular compositions, optical properties, and sources of dissolved organic matter (DOM) were investigated using various methods. The results revealed that monsoonal climate and biogeochemical processes were the main factors influencing DOM components and sources. Additionally, the analysis of DOM can aid in identifying potential contaminants and understanding water quality variations.
JOURNAL OF HYDROLOGY
(2023)
Article
Engineering, Environmental
Danni Yuan, Y. Jun Xu, Shiwang Ma, Jingquan Le, Kairui Zhang, Rongli Miao, Siyue Li
Summary: Through a mesocosm experiment, this study found that nitrogen addition and climate warming have a combined effect on the level of CO2 in shallow lakes, indicating that eutrophic shallow lakes would face a double crisis in the future climate. The addition of nitrogen and warming also alter the phytoplankton community structure, suggesting a potential shift in the biological system of shallow lakes under changing climate. Therefore, reducing nitrogen pollution is crucial for the sustainable development of shallow lake systems.