LUMINESCENCE
·
2021
·Vol. 36
·期 6
·1469-1475
·
IF 2.464
Xiping Mei,Dongxiu Wang,Lin Zhang,Junfen Li,Chuan Dong
Fifty-four Eucommia ulmoides leaves were subjected to a hydrothermal technique to synthesize carbon dots (CDs) of 3.55 ± 1.45 nm size. The nanomaterial possessed excellent stability and strong fluorescence emission (φ f 42.3%). In a neutral buffer solution, the fluorescence signals of CDs solution were enhanced by aluminium ion without interference from other ions. Degree of enhancement correlated linearly with the Al 3+ content in the range 0.01–2.5 mM. Response of this method was fast and sensitive (detection limit was 23 nM). The CDs performed successfully as a sensitive sensor for trace Al 3+ determination in water samples, and satisfactory results were obtained.
研究领域:
纳米材料科学
·
环境监测
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
iScience
·
2022
·
IF 6.107
Wei Shi,Chunhui Li,Haiqing Wang,Zhiquan Wang,Lei Yang
Owing to the characteristics of THz wave, the terahertz time-domain spectral (THz-TDS) system has potentials in the field of biological macromolecule detection. However, water with strong absorption effect on THz wave exists in most biological detection, so the research focus in this field is to study aqueous samples. In view of these, THz spectroscopy system has research value for qualitative and quantitative detection of α-lactose and its water-containing samples. This research used a THz-TDS system with LiNbO 3 crystal to generate strong THz wave that was used to test 0.29 mmol α-lactose samples with water content of 15 μL–930 μL by using attenuating total reflection (ATR) prism. The absorption peak at 0.53 THz is detected, and with the increase of water content, the curve of absorption spectrum is observed to move up on the whole. This research has a guiding role for the test and improvement of water content limit in this field.
研究领域:
生物物理学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2025
·Vol. 172
·期 4
·047505
·
IF 3.3
Moustafa Zahran,Suzan Mohammed,Magdy A.-H. Zahran,Magdi Abdel Azzem
Congo red (CR), a synthetic azo dye, is known for its high toxicity and potential to bioaccumulate in the food chain. Exposure to CR-contaminated water can lead to various health issues, including cancer, underscoring the need for effective quantification and treatment methods. While reliable, traditional chromatographic and spectroscopic techniques are often complex, require toxic solvents, and may not be suitable for rapid or on-site analysis. Herein, we report a replacement tool for quantifying CR in water samples using an electrochemical sensor modified with biosynthesized chitosan-capped silver nanoparticles (AgNPs). AgNP identification was accomplished using ultraviolet-visible spectroscopy and square wave voltammetry (SWV), which showed AgNP characteristic peaks at 438 nm and 0.06 V, respectively. A transmission electron microscope confirmed the spherical shape of AgNPs and their average size (30 nm). The electrocatalytic activity of AgNPs towards CR was also approved using cyclic voltammetry, SWV, and impedance spectroscopy. Thus, the SWVs of different concentrations of CR were used to obtain the calibration curve, showing limits of detection and quantification of 0.017 and 0.056 μM, respectively. Additionally, the interferences and real sample studies showed that the chitosan-capped AgNPs sensor is suitable for quantifying CR in river water samples with high selectivity.
研究领域:
环境科学
·
纳米生物学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
NANO
·
2018
·
IF 1.1
Jing Liu,Xiao Li,Xin Gong,Taiping Qing,Peng Zhang,Bo Feng
The incorporation of dopant atoms alters the structure of MoS 2 , resulting in unique properties and practical applications. Herein, a facile and low-cost approach for producing N-doped molybdenum disulfide (N-MoS 2 ) was carried out using melamine and MoS 2 in a laboratory tube furnace at 400 ∘ C for 2 h. The N-MoS 2 fluorescent probe showed sensitive response to Hg 2 + in a wide concentration range of 0.4–10 μ M with a low limit of 28 nM. The practical applicability of detecting Hg 2 + in lake water samples may open a new way to evaluate Hg 2 + in wastewater.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2016
·
IF 3.926
Wenmin Zhang,Mingxia Lin,Ping Tong,Qiaomei Lu,Lan Zhang
A simple, rapid and sensitive method for determination of trace levels of domoic acid (DA) in seawater was developed, based on a magnetic solid-phase extraction (MSPE) followed by high-performance liquid chromatography with tandem mass spectrometry (HPLC–MS/MS). Five kinds of ferrite magnetic nanospheres (MFe 2 O 4 ; M = Fe, Co, Ni, Cu and Zn) were prepared and first used as sorbents for MSPE of DA and removal of salt interference. Under the same extraction and elution conditions, CuFe 2 O 4 magnetic nanospheres provided the best pretreatment performance, which were then characterized in detail. After further optimization of conditions, the developed method showed good linearity (r 2 = 0.9991) with the range of 5–1000 pg mL −1 , low limit of detection (2.5 pg mL −1 ; S/N = 3:1), low limit of quantification (5.0 pg mL −1 ; S/N = 10:1), and good recoveries (86.0–98.1%) with acceptable repeatability (RSD ≤ 6.5%; n = 3) in seawater samples. The results demonstrated that the ferrite magnetic nanospheres are promising sorbents for efficient extraction of highly polar analytes from high ionic strength solutions.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2017
·
IF 2.536
Lijun He,Heng Zhang,Huanhuan Fan,Xiuming Jiang,Wenjie Zhao,Guo Qiang Xiang
Herein, we propose a simple and effective strategy for designing a ratiometric fluorescent nanosensor. We designed and developed a carbon dots (CDs) based dual-emission nanosensor for vanadium(V) by coating the surface of dye-doped silica nanoparticles with CDs. The fluorescence of dual-emission silica nanoparticles was quenched in acetic acid through potassium bromate (KBrO 3 ) oxidation. V(V) could catalyze KBrO 3 oxidation reaction process, resulting in the ratiometric fluorescence quenching of dual-emission silica nanoparticles. We investigated several important parameters affecting the performance of the nanosensor. Under the optimized conditions, the detection limit of this nanosensor reached 1.1 ng mL − 1 and the linear range from 10 to 800 ng mL − 1 . Furthermore, we found that the sensor was suitable for determination of V(V) in different mineral water samples with satisfactory results.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Zuo-Qin Liang,Dong-Dong Song,Zhuo-Cheng Li,Su-Hang Xu,Guo-Liang Dai,Chang-Qing Ye,Xiao-Mei Wang,Xu-Tang Tao
Photoactivatable probes can switch fluorescence on from a weak or nonemission state to improve the sensitivity of the sensing system. In this work, we successfully constructed three highly emissive photoactivatable probes, 2-DP, 1-2-DP and 2-2-DP, for Cu 2+ detection. Under UV irradiation, the photoluminescence quantum yields of 2-DP, 1-2-DP and 2-2-DP display approximately 52.4-, 11.5- and 49.2-fold enhancement, respectively. Cu 2+ selectively quenches the bright photoactivated fluorescence, resulting in an approximately 38-fold fluorescence reduction. The highly selective fluorescence response to Cu 2+ yields an excellent low detection limit of 5.8 nM. Moreover, the photoactivatable probes were successfully applied for Cu 2+ determination in tap water and tea samples with recovery ranges of 95%–105% and 97%–106%, respectively. This work provides a more sensitive and efficient methodology for Cu 2+ detection in heavy metal pollution and food safety.
研究领域:
分析化学
·
环境科学
·
食品安全
✓ 已验证
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Qi Lian,Han Liu,Xuefang Zheng,Xiaoming Li,Fengjie Zhang,Jing Gao
A general method for the preparation of Pt doped CuO/Pt nanoflowers (CuO/Pt NFs) for peroxidase mimicking has been demonstrated via hydrothermal method . Pt ions could be reduced to Pt nanoparticles by using the ascorbic acid (AA) as reducing agent and Pt ions were uniformly doped in the CuO nanoflowers by using the bovine serum albumin (BSA) as the stabilizer . The obtained CuO/Pt NFs exhibited a higher peroxidase-like catalytic activity than individual CuO and Pt nanoparticles alone, which could be ascribed to their synergistic effect. In the presence of hydrogen peroxide (H 2 O 2 ), the CuO/Pt NFs could catalyze the oxidation of chromogen 3,3′,5,5′-tetramethylbenzidine (TMB) to a blue color product. The peroxidase activity of CuO/Pt NFs was selectively inhibited by Hg 2+ due to form the CuO/Pt-Hg trimetallic amalgam . However, the inhibition was not affected by other metal ions . Therefore, a novel colorimetric biosensor was developed for sensitive detection of mercuric ions by using CuO/Pt NFs. This method exhibited a wide response linear range, low limit of quantification values, excellent sensitivity and selectivity for detection of Hg 2+ in various ground water samples, which was verified with CVAAS. With the advantages of rapid response, simple operation, naked-eye observation and low cost, the colorimetric CuO/Pt NFs sensor showed bright prospects for detection of Hg 2+ in various water samples and public drinking water distribution systems .
研究领域:
环境科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Bicheng Liu,Liangming Wu,Zoujun Peng,Sihao Wu,Ping Qiu
A colorimetric gold nanoparticles (AuNPs)-based acetylcholinesterase (AChE) assay was designed for the first time to measure the concentration of parathion-methyl (PM) in lake water samples. In this assay, the analyte PM inhibited the hydrolysis of acetylthiocholine (ATCh) by AChE, preventing the formation of thiocholine (TCh) that would otherwise react with the AuNPs catalyst and deactivate the catalyst. Therefore, in the presence of PM, the AuNPs catalyzed the oxidation of the 3,3′,5,5′-tetramethylbenzidine (TMB) colorimetric indicator to oxTMB, inducing a visual color change from colorless to blue. However, in the absence of PM, AChE hydrolyzed ATCh to TCh, which then reacted with the AuNPs, preventing the oxidation of TMB to oxTMB and rendering the solution colorless. Therefore, the change in the color of the analyte solution indicated the presence of PM, and the absorbance of the resulting solution was measured by UV–Vis spectroscopy to calculate the concentration of PM after generation of a calibration curve. This method was then employed using the smartphone app Color Picker, which converted the color information from the photos of the solution into digital red (R), green (G), and blue (B) values. The ratio of green (G) to blue (B) (G/B) was then plotted against the corresponding concentration to calculate the standard curve, whose regression equation was expressed by y = –0.012x + 1.02 (ng/mL), and the coefficient of determination (R 2 ) was 0.97. In addition, this method was also used to determine the amount of PM in real lake water samples with recovery of 90.2–133.3%.
研究领域:
环境科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2021
·Vol. 44
·期 11
·2301-2309
·
IF 3.645
Tianfeng Wan,Zilin Chen
Covalent organic nanospheres are new kind of nanospherical polymer with large specific surface area, uniform morphology, and excellent chemical and thermal stability. This material can be fabricated by a facile and rapid room temperature solution-phase strategy. In this work, magnetic nanoparticles were attached to the surface of covalent organic nanospheres, and the obtained composites were used for the extraction of blood lipid regulators such as clofibrate and fenofibrate. These composites were characterized with Fourier-transformed infrared spectroscopy, X-ray photoelectron spectroscopy, and transmission electron microscopy. Several parameters that might affect the extraction efficiency including acetonitrile content, pH value, extraction time, and sample volume were investigated. Under optimum conditions, the proposed analytical method showed high extraction efficiency toward clofibrate and fenofibrate with enrichment factors between 60 and 83. This method exhibited outstanding analytical performance with wide linear range and excellent reproducibility and had low limits of detection in the range of 0.02–0.03 ng/mL. This method was also applied to the detection of clofibrate and fenofibrate in lake water samples, and good recoveries in the range of 92.6–112.6% was obtained.
研究领域:
分析化学
·
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2019
·
IF 3.206
Zhihong Shi,Jing Jiang,Weiyue Pang,Hongyu Ma,Xiaoxue Chu,Can Zhou,Hongyi Zhang
In this study, carbon fibers (CFs) were used as sorbent material for the dispersive micro-solid phase extraction (d-μSPE) of anthracene , acenaphthene and phenanthrene from tea infusion samples prior to gas chromatography-quadrupole mass spectrometric detection. CFs were obtained by carbonizing cotton at 800 °C under the protection of nitrogen for 4 h. After characterization by the scanning electron microscopy-energy dispersive spectrometry, X-ray diffraction and N 2 adsorption-desorption, 20 mg of CFs were used to effectively adsorb PAHs in 5 min from 10 mL of tea infusion samples, 2 mL of toluene was used as desorbent . Under the optimum conditions, good linearity was obtained with R 2 between 0.9996 and 0.9998. The limits of detection were in the range of 0.012–0.014 μg/L. RSD values for intra- and inter-day precision were ≤6.7% and ≤7.8%, respectively. In this work, cotton based CFs were prepared in a solventless and green way and the CFs based d-μSPE procedure was simple, rapid and cost-effective, with no need of column-packing. The proposed method has been successfully applied to the analysis of PAHs in three kinds of tea infusion 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
FOOD CHEMISTRY
·
2025
·
IF 9.8
Mengru Liu,Taotao Zhe,Limin Zhu,Fan Li,Kaixuan Ma,Chenyu Xuan,Qinlin Feng,Shaohui Ouyang,Li Wang
The contamination of nitrofurantoin (NFT) antibiotics in the food chain poses significant threats to environmental and public health, emphasizing the urgent need for rapid and portable detection. This study presents an electrochemical sensor based on a 2D/2D van der Waals heterojunction of VS 2 and Ti 3 C 2 T x MXene integrated onto a screen-printed carbon electrode (SPCE). Interfacial engineering of Ti S bonds creates efficient charge transfer pathways and a directional built-in electric field, enhancing charge dynamics and electroreduction efficiency. The VS 2 /Ti 3 C 2 T x MXene-SPCE sensor shows an ultralow detection limit of 4.7 nM, a wide linear range (0.01–400 μM), and high stability with strong resistance to interference. Its practical applicability was validated by successful NFT detection in tap water, lake water, milk, and honey, yielding satisfactory results. This work highlights the catalytic potential of VS 2 / Ti 3 C 2 T x MXene heterojunctions and demonstrates the sensor as a promising tool for environmental monitoring and food safety.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 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）