ANALYTICAL LETTERS
·
2020
·
IF 1.467
Xiaoxia Lai,Sizhe Zhang,Guorong Du,Yuxian Wang,Yang Han,Nengsheng Ye,Yuhong Xiang
Malathion is a toxic organophosphorus pesticide. When ingested by humans, it affects the nervous system and endangers health. Herein, a new type of aptamer-based sensor was developed for its determination. The results demonstrate that this sensor has high sensitivity and good selectivity and was successfully used for the determination of malathion in apples. The detection mechanism is as follows. The aptamer is adsorbed on the surface of gold nanoparticles (AuNPs) to prevent the aggregation of AuNPs in a high salt solution. After adding malathion, the aptamer specifically binds to malathion and is removed from the surface of the AuNPs. The quantity of aptamer adsorbed on the surface of AuNPs had a negative relationship with the malathion concentration. The unmodified AuNPs aggregated to different degrees in NaCl solution. In the Fehling reaction, various degrees of aggregated AuNPs catalyze the reduction to different size Cu2O and exhibit different resonance scattering intensities. An excellent linear response between the resonance scattering spectra intensity and malathion concentration was obtained. The limit of detection of the developed method was 5.24 ng/L (15.86 pM). The recovery and repeatability for the apple samples were satisfactory.
研究领域:
分析化学
·
环境科学
·
食品安全
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Chemistry and Technology
·
2022
·Vol. 44
·期 6
·482-487
·
IF 0.484
Ruijia Lan,Su Wenbin,Jia Yanan,Li Jitai
Abstract With the increasingly extensive application of persulfate for water treatment, the development of persulfate detection technology has gradually become a research hotspot. Ferrous ions can catalyze peroxydisulphate (PDS) to produce \({\text{SO}}_{4}^{ - }• \) and \(• {\text{OH}}\) , which oxidize excessive KI to form \({\text{I}}_{3}^{ - }\) . Then \({\text{I}}_{3}^{ - }\) and cationic dye (Basic Blue 54) form ion association complex through electrostatic interaction. These complexes aggregate to form particles with the average size of 362 nm. Formation of ion association particles leads to sharp enhancement of resonance scattering intensity of the system. Based on this principle, a new method for the resonance light scattering determination of peroxydisulphate has been developed, and the optimum reaction conditions, influential factors and applications were investigated. Initial solution pH of 4.5, initial Fe 2+ concentration of 3.0 × 10 –6 mol L –1 , KI concentration of 1.0 × 10 –3 mol L –1 , BB54 concentration of 2.0 × 10 –5 mol L –1 , these conditions were selected as the optimized initial concentration for the detection of PDS. Under the optimal reaction conditions, peroxydisulphate concentrations of 2.5 × 10 –7 –1.8 × 10 –5 mol × L –1 were linearly correlated with the reduction of the resonance light scattering intensity with a correlation coefficient of 0.99 and a detection limit of 7.8 × 10 –8 mol L –1 . This method of measuring PDS shows a higher sensitivity than other methods. The interferences of coexisting substances were also investigated. It has been applied to the analysis of peroxydisulphate in water samples. The recovery rates of the spiked samples were in the range between 91.1–106.2% which showed that the method had high accuracy for the analysis of peroxydisulphate.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2019
·
IF 5.399
Shang Yan,Xiaoxia Lai,Yuxian Wang,Nengsheng Ye,Yuhong Xiang
TOB aptamer can be adsorbed on the AuNPs surface to form AuNPs-aptamer complexation to prevent AuNPs aggregation in high salt solution. When TOB was added to the AuNPs solution, the aptamer would bind with TOB and depart from the AuNPs surface. The amount of the AuNPs-aptamer complexation depends on the TOB concentration. Different concentration of AuNPs-aptamer can catalyze the reduction reaction of CuSO 4 to produce different size Cu 2 O particle. The resonance scattering peak intensities are correlated with the Cu 2 O size. Large size Cu 2 O particle as a resonance scattering spectroscopy probe can remarkable improve the TOB detection sensitivity. We have succeeded to detect the trace TOB in aqueous solutions. The linear range and limit of detection were 0.50–17 nM and 0.19 nM, respectively. This simple and inexpensive method exhibited high sensitivity and selectivity, which was successfully used to detect TOB in milk. The results indicated the accuracy and precision were satisfied.
研究领域:
分析化学
·
纳米技术
·
食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Zong-Tao Li,Bo-Jia Li,Jia-Sheng Li,Cun-Jiang Song,Xin-Rui Ding,Hai-Long Yuan,Bin-Hai Yu,Yong Tang,Jian-Zhen Ou,Romain Gautier,Hong-Lei Ji,Hao-Chung Kuo
Although stable perovskite phosphors, i.e., CsPbBr 3 /Cs 4 PbBr 6 , were extensively reported and made great progress, achieving strong photoluminescence (PL) energy outcoupling remains challenging owing to their short Stoke’s shift with serious PL energy absorption. This study utilized internal resonant scattering (IRS) to improve the PL energy outcoupling (PEO) of CsPbBr 3 /Cs 4 PbBr 6 perovskite phosphor, which was realized by the nanopore-packing perovskite particles (NP-PPs) structure inside a phosphor. The nano-porous matrix hybrid solid–liquid interfacial reaction was developed to construct NP-PPs in a phosphor, and it is optimized to achieve a denser NP-PP structure with an enhanced PEO effect (2.8-fold enhanced PL intensity). Numerical results revealed that the NP-PP structure transforms the PL energy absorption mode to the IRS mode, most of the scattering PL energy evades NP-PPs instead of propagating inside. The optimized phosphor was applied to white devices, and we finally achieved an ultrahigh luminous efficacy of 131.32 lm/W based on green perovskite phosphors. This study provides a general guide for efficient perovskite phosphors utilizing the nano-porous matrix to enable the IRS effect.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
FARADAY DISCUSSIONS
·
2016
·Vol. 193
·371-385
·
IF 3.544
Chao Jing,Zhen Gu,Yi-Tao Long
Imaging electrochemical processes has attracted increasing attention in past decades. Particularly, monitoring electrochemical reactions rapidly at the nano-scale is still a challenge due to the ultra-low current detection and long scanning time required. The development of optical techniques provide a new way to demonstrate electrochemical processes through optical signals which enhance sensitivity and spatial resolution. Herein, we developed a novel method to image electrocatalytic processes on single gold nanorods (GNRs) during Cyclic Voltammetry (CV) scanning based on plasmon resonance scattering information by using dark-field microscopy. The electrocatalytic oxidation of hydrogen peroxide was selected as a typical reaction and the catalytic mechanism was revealed using the obtained spectra. Notably, observation on single GNRs avoided the averaging effects in bulk systems and confirmed that the individual nanoparticles had variable catalytic properties with different spectral change during the reaction process. Furthermore, a color-amplified system was introduced to convert light intensity into imaging information via the Matlab program which was able to image thousands of nanoparticles simultaneously. This approach offered the statistical intensity distribution of all of the nanoparticles in a dark-field image which dramatically enhanced the detection accuracy and avoided random events.
研究领域:
纳米技术
·
电化学
·
光学成像
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2013
·
IF 3.535
Yizhong Shen,Shaopu Liu,Ling Kong,Dan Li,Youqiu He
Thioglycolic acid-capped (TGA-capped) CdTe/CdS quantum dots (QDs) were prepared in the water phase. The interaction of TGA-CdTe/CdS QDs with polymyxin B sulfate (POBS) was investigated by ultraviolet–visible (UV–vis) absorption, fluorescence (FL), resonance Rayleigh scattering (RRS) spectroscopy and the measurement of fluorescence lifetime . Under optimum conditions, not only the UV–vis absorption and fluorescence spectra were changed, but also the RRS intensity was greatly enhanced. These phenomena offered useful techniques for the determination of POBS with fluorescence quenching and RRS methods . The linear ranges and detection limits of POBS were 0.09–5.25 μg mL −1 and 27.5 ng mL −1 for the fluorescence quenching technique, 0.02–6.0 μg mL −1 and 6.36 ng mL −1 for the RRS technique. Among them, the RRS approach obtained the higher sensitivity. Accordingly, a novel rapid, convenient, and highly sensitive RRS method for the determination of POBS was proposed and applied to detect POBS in pharmaceutical preparations with satisfactory results. Furthermore, the suitable reaction conditions, affecting factors as well as the influence of coexisting substances were studied. Some possible reaction mechanisms were also discussed.
研究领域:
分析化学
·
生物医学工程
✓ 已验证
DOI
高影响因子
Food Analytical Methods
·
2019
·Vol. 12
·期 10
·2161-2171
·
IF 2.413
Lai Xiaoxia,Yan Shang,Ye Nengsheng,Xiang Yuhong
Acetylcholinesterase (AChE) can catalyze the hydrolysis of acetylthiocholine iodide (S-ACh-I) to produce thiocholine, which can crosslink with gold nanoparticles (AuNPs) by Au-S covalent bond and trigger AuNPs aggregation. The catalytic ability of aggregation of AuNPs is less than dispersed AuNPs. In the presence of carbaryl, which can inhibit the catalysis activity of AChE, therefore, the production amounts of thiocholine and aggregation degree were decreased. In the Fehling reaction, low aggregation degree AuNPs was used to catalyze the reduction of Cu 2+ by glucose to form large size Cu 2 O particle. Large Cu 2 O particle has high resonance scattering signal intensities, which is negative correlated with carbaryl concentration. The developed assay was applied to detect the carbaryl in aqueous solutions, and two excellent linear relationships were obtained in the range of 0.03–3.31 nM and 26.50–265.05 nM. The limit of detection (LOD) of carbaryl was down to 17.49 pM. The proposed method was successfully used to determine the concentration of spiked carbaryl in the apple matrix, and satisfactory recovery and repeatability were obtained.
研究领域:
分析化学
·
环境科学
·
纳米技术
·
食品安全
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2016
·Vol. 408
·期 19
·5247-5259
·
IF 3.125
Pan Ziyu,Peng Jingdong,Zang Xu,Lei Gang,He Yan,Liu Di
A novel, highly selective, and sensitive resonance light scattering (RLS) detection approach coupled with high performance liquid chromatography (HPLC) was researched and developed for the synchronous analysis of three kinds of benzimidazole anthelmintics, including mebendazole (MBZ), albendazole (ABZ), and fenbendazole (FBZ) for the first time. In the pH range of 3.5–3.7 Britton-Robinson buffer medium, three kinds of anthelmintics, which were separated by HPLC, reacted with eosin Y (EY) to form 1:1 ion-association complexes, resulting in significantly enhanced RLS signals and the maximum peak located at 335 nm. The enhanced RLS intensity was in proportion to the MBZ, ABZ, and FBZ concentration in the range 0.2–25, 0.2–23, and 0.15–20 μg/mL, respectively. The limit of detection was in the range of 0.064–0.16 μg/mL. In addition, human urine was determined to validate the proposed method by spiked samples and real urine samples. Satisfactory results were obtained by HPLC-RLS method.
The diagram mechanism of generating resonance between emitted light and scattered light
研究领域:
分析化学
·
药物分析
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Methods and Applications in Fluorescence
·
2023
·Vol. 11
·期 3
·035001
·
IF 3.2
Shiqi Guo,Yilin Chai,Yongjun Wu,Hongchao Guo,Fei Yu,Li-e Liu,Leiliang He,Songcheng Yu,Yongmei Tian,Jia Wang,Ruiying Yang,Ningge Jian,Yilin Wang
In recent years, tetracyclines (TCs) is a hot research topic. Herein, we report an interesting discovery using the complexation of oxytetracycline and metal ions. In this study, according to the properties of Fe3O4 nanoparticles (Fe3O4 NPs) as a nanoenzyme, it can be used to catalyze the oxidation of KI by H2O2 to produce while at the same time binds to rhodamine 6G (Rh6G) to form a conjoined particle (Rh6G ∼ I3)n, leading to a decrease in the fluorescence intensity of Rh6G. However, in the presence of TCs, Fe3O4 NPs have a synergistic effect with TCs, leading to enhanced catalytic activity, as well as better selectivity compared to the activity of other reducing enzymes. Consequently,the fluorescent signal based on a resonance scattering effect between Rh6G and is dependent on the concentration of TCs, thus achieving highly facile and robust detection of TCs. The limits of detection (LOD) of the method were 20 nM, 10 nM and 40 nM for oxytetracycline(OTC), tetracycline(TC) and chlortetracycline(CTC), respectively. Most importantly, the method can be successfully applied to the detection of TCs in milk, eggs, and honey. The recoveries of spiked samples ranged from 83.11 to 118.95%. Thus, a stable, hands-on strategy for the detection of TCs is proposed, which has potential applications in the field of food safety and environmental protection.
研究领域:
分析化学
·
环境科学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Jinghao Zhu,Guiyang Yu,Hang Gao,Ruihong Sun,Ke Gong,Xiang Li,Debao Wang
Solar-driven upcycling of plastic waste to valuable chemicals provides an economic and low-energy technology to solve the accumulation of plastic waste and environmental pollution problems. However, simply relying on the capacity of single semiconductor system is still limited for high-efficient upcycling activity. Here, a low-cost plasmonic metal Bi-modified P-doped g-C 3 N 4 (Bi/PCN) is firstly reported to apply the conversion of waste plastics (including PE, PP, PVC, PEG, and PAM) under natural environment conditions without adding any cocatalysts or sacrificial agents. TAS and theoretical calculation reveal that the synergistic effect of Bi plasmonic excitation and doped P engineering not only improves light absorption ability, but also tunes interfacial Schottky barrier height (SBH) for the excellent charge separation and transport. The superposed amplification effect of Bi plasmonic excitation originates from hot electron injection, SPR scattering effect, and electromagnetic near-field enhancement. Optimized 1.0 %Bi/PCN composite achieves highly efficient upcycling of PE plastic to HCOOH product as liquid hydrogen storage medium with 1.88 % upcycling efficiency, which is the highest upcycling efficiency upon plasmonic photocatalysts as present. In situ EPR and IR spectra disclose plastics proceed multi-oxidative C C cleavage, where •O 2 and •OH radicals trigger plastic molecule and the intermediates of alkyl peroxide, alkyl radical, and alkoxy radical are successively formed. This work provides a preferable strategy for developing high-performance photocatalysts for upcycling of plastics waste through surface plasmon effect.
研究领域:
环境科学
·
材料化学
·
光催化
·
塑料回收
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）