RSC Advances
·
2016
·Vol. 6
·期 114
·113570-113575
·
IF 3.289
Wenyu Gao,Xiaofang Wang,Pei Li,Qiongtao Wu,Fang Qi,Songmei Wu,Yu Yu,Kejian Ding
A highly sensitive and selective electrochemical sensor is developed for the detection of cadmium with a nanosheet graphitic carbon nitride (g-C3N4) modified electrode. The g-C3N4 nanosheet modified glassy carbon electrode detects heavy metal not only by electrostatic interactions, but also by intercalating the holes during differential pulse anodic stripping voltammetry (DPASV) measurements for Cd2+ in aqueous solution. The calibration curves for Cd2+ covered two ranges varying from 1 nM to 1 μM and 1 μM to 100 μM. The limitation of detection (LOD) is estimated to be 0.5 nM for Cd2+, which is 53 times lower than the guideline values of drinking water given by the World Health Organization (WHO). In addition, the good repeatability and stability of the modified electrode is feasible for heavy metal detection in this study.
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
ANALYTICAL BIOCHEMISTRY
·
2020
·
IF 2.877
Zui Tao,Liting Wei,Shijia Wu,Nuo Duan,Xiang Li,Zhouping Wang
In this work, a colorimetric aptamer-based method for detection of cadmium using gold nanoparticles modified MoS 2 nanocomposites as enzyme mimic is established. In short, biotinylated Cd 2+ aptamers are immobilized by biotin-avidin binding on the bottoms of the microplate, the complementary strands of Cd 2+ aptamers are connected to the Au–MoS 2 nanocomposites which have the function of enhanced peroxidase-like activity. The csDNA-Au-MoS 2 signal probe and target Cd 2+ compete for binding Cd 2+ aptamer , the color change can be observed by addition of chromogenic substrate, thereby realizing visual detection of Cd 2+ . The absorbance of the solution at 450 nm has a clear linear relationship with the Cd 2+ concentration. The linear range is 1–500 ng/mL, and the limit of detection is 0.7 ng/mL. The assay was used to test white wine samples, the results are consistent with those of atomic absorption spectrometry ; which prove that this method can be used for detection of Cd 2+ in real samples.
研究领域:
分析化学
·
纳米生物学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
·
2021
·Vol. 36
·期 7
·1422-1430
·
IF 4.023
Qing Mou,Liang Dong,Lei Xu,Zelin Song,Ying Yu,Erhu Wang,Yuhao Zhao,Ying Gao
In this work, a novel strategy integrating Fenton-like digestion as well as metal ion assisted photochemical vapor generation (PVG), plus inductively coupled plasma-mass spectrometry (ICP-MS) measurements, was first proposed for the analysis of cadmium (Cd) in rice samples. Cobalt ions were used not only as the catalyst in the Fenton-like digestion for accelerating the decomposition of the sample matrix but also as the “sensitizer” for enhancing the PVG of the analytes for the first time. Compared to conventional microwave digestion, the consumption of HNO3 in the Fenton-like digestion was reduced significantly to 4% (v/v), and the digestion time was substantially decreased to 25 min. In addition, the PVG efficiency of Cd is largely improved in the presence of Co2+ and the analytical sensitivity of Cd, using Co2+-PVG as a sample introduction method, was increased seven-fold compared to that obtained from direct solution nebulization. The interferences from co-existing ions were greatly reduced in comparison with those found using either ferric ion assisted PVG or direct solution nebulization with ICP-MS measurement. Under the optimized experimental conditions, the limit of detection (LOD, 3σ) was 1.6 μg kg−1 using a 0.050 g rice sample and the relative standard deviation (RSD) was 1.8% for the replicate measurement of 1 μg L−1 Cd2+ (n = 7). The method was successfully applied to the determination of Cd in rice and wheat flour 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
TALANTA
·
2021
·
IF 6.057
Bin Lai,Haitao Wang,Wentao Su,Zhouping Wang,Bei-Wei Zhu,Chenxu Yu,Mingqian Tan
Cadmium contamination is a severe food safety risk for human health. Herein, a long afterglow “off-on” phosphorescent aptasensor was developed based on phosphorescence resonance energy transfer (PRET) for the detection of Cd 2+ in complex samples which minimizes the interference of background fluorescence. In this scheme, initially the phosphorescence of Cd 2+ -binding aptamer conjugated long afterglow nanoparticles (Zn 2 GeO 4 :Mn) was quenched by black hole quencher 1 (BHQ 1 ) modified complementary DNA. Upon encountering of Cd 2+ , the aptamer interacted with Cd 2+ and the complementary DNA with BHQ 1 was released, leading to phosphorescence recovery. The content of Cd 2+ could be quantified by the intensity of phosphorescence recovery with 100 μs gate time (which eliminated the sample autofluorescence) with a linear relationship between 0.5 and 50 μg L −1 and a limit of detection (LOD) of 0.35 μg L −1 . This method was successfully demonstrated for Cd 2+ detection in drinking water and yesso scallop samples. The “off-on” phosphorescent aptasensor based on PRET of long afterglow nanomaterials could be an effective tool for Cd 2+ detection in food samples.
研究领域:
食品科学
·
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers in Bioengineering and Biotechnology
·
2021
·
IF 5.89
Zhang Guangbao,Hu Shuting,Jia Xiaoqiang
Although many whole-cell biosensors (WCBs) for the detection of Cd2+ have been developed over the years, most lack sensitivity and specificity. In this paper, we developed a Cd2+ WCB with a negative feedback amplifier in P. putida KT2440. Based on the slope of the linear detection curve as a measure of sensitivity, WCB with negative feedback amplifier greatly increased the output signal of the reporter mCherry, resulting in 33% greater sensitivity than in an equivalent WCB without the negative feedback circuit. Moreover, WCB with negative feedback amplifier exhibited increased Cd2+ tolerance and a lower detection limit of 0.1 nM, a remarkable 400-fold improvement compared to the WCB without the negative feedback circuit, which is significantly below the World Health Organization standard of 27 nM (0.003 mg/L) for cadmium in drinking water. Due to the superior amplification of the output signal, WCB with negative feedback amplifier can provide a detectable signal in a much shorter time, and a fast response is highly preferable for real field applications. In addition, the WCB with negative feedback amplifier showed an unusually high specificity for Cd2+ compared to other metal ions, giving signals with other metals that were between 17.6 and 41.4 times weaker than with Cd2+. In summary, the negative feedback amplifier WCB designed in this work meets the requirements of Cd2+ detection with very high sensitivity and specificity, which also demonstrates that genetic negative feedback amplifiers are excellent tools for improving the performance of WCBs.
研究领域:
生物技术
·
环境科学
·
合成生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Zhiyu Chen,Chao Liu,Xiaoyu Su,Wen Zhang,Xiaobo Zou
The synergy of semi-complementary aptamer couple and signal on-off ratiometric strategy is applied with multi-purpose screen-printed electrode (SPE). The homemade SPE simultaneously accommodates capacities for primary ratiometric sensing and supplementary on-chip pH monitoring. Cd 2+ aptamer performs as a molecular recognizer, in the sensing system, to provide target signal of Cd 2+ ( I Cd 2+ ). Polythionine-Au (PTh-Au) is bound to a single-strand DNA (ssDNA), semi-complementary to Cd 2+ aptamer. The [email protected] , self-assembled with Cd 2+ aptamer by hybridization, can be competitively replaced by Cd 2+ , causing a loss in I PTh-Au . Thus, the target signal ( I Cd 2+ ) and the reference signal ( I PTh-Au ) well compose a ratiometric sensing system. Modifications and sensing behaviors are comprehensively validated with laboratorial methods from morphology, spectroscopy and electrochemistry. The proposed aptasensor presents considerable advances in analytical performances. During interference study and stability examination, the ratiometric signal, I Cd 2+ /I PTh-Au , is proven a more reliable indicator than solo-signal readout. Following a log-linear relationship, this sensor provides wide dynamic range, as 2 × 10 −3 ∼8 × 10 −1 mg L −1 , to target Cd 2+ . Limit of detection is well found as 7 × 10 −4 mg L −1 based on experimental criterion. The proposed sensor is consequently applied for Cd 2+ determination in real mussel samples. Recommend results meet well with those from ICP-MS and recovery test.
研究领域:
分析化学
·
环境科学
·
生物传感技术
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Tao Lin,Jing Hu,Yujia Deng,Wen Zeng,Xiaoming Jiang,Xiandeng Hou
A miniaturized atomic absorption spectrometer (AAS) was proposed with a planar dielectric barrier discharge (DBD) microplasma as an atomizer, a charge coupled device (CCD) spectrometer as a spectral detector, and a hydride generation (HG) unit as a sampler, and the potential analytical capability was evaluated through the determination of cadmium. Auxiliary hydrogen was added to enhance the atomic absorption signals and the potential mechanism of enhancement effect was studied by use of various techniques. The HG-DBD-AAS was further applied to the determination of Cd, yielding a 1.7-fold enhancement in AAS response with added hydrogen and a limit of detection (LOD) of 0.3 μg L −1 under optimized conditions. Good agreement with the certified values, and desirable spike recoveries ranging between 98% and 108%, were obtained for two certified reference materials and several real water samples, respectively. It can be useful in field analysis of many trace elements with high detectability.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
Foods
·
2025
·Vol. 14
·期 24
·4252
·
IF 5.1
Baoli Wang,Kai Tang,Feng Yang
Understanding the extent of cadmium (Cd) contamination and its impact on the food industry and ecosystems is crucial; to this end, electrochemical methods provide sensitive and rapid responses for the in situ detection of heavy metal ions. In this paper, a sensitive Cd2+electrochemical sensor was constructed by using a composite material composed of biomass-derived porous carbon and manganese dioxide (MnO2/KLSC). The composite was demonstrated to have a porous structure with quasi-cubic MnO2particles evenly distributed on the carbon matrix. Using MnO2/KLSC as the electrode material, a simple electrochemical sensing platform was fabricated for the detection of Cd2+. The electrochemical analysis showed that the Cd2+sensor has good performance, with a linear detection range of 0.01–80.0 μmol/L and a detection limit of 9.8 nmol/L. Furthermore, the sensor shows excellent repeatability, reproducibility, and good anti-interference. The sensor was successfully applied to analyze rice and sea water samples, demonstrating satisfactory recovery rates. The good performance of MnO2/KLSC/GCE can be attributed to the excellent electrical conductivity, enlarged active surface area, and good electron transfer capability.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROANALYSIS
·
2018
·Vol. 30
·期 9
·1906-1912
·
IF 2.851
Danfeng Qin,Le Wang,Sanshuang Gao,Ying Wang,Xamxikamar Mamat,Yongtao Li,Thomas Wagberg,Hao Cheng,Guangzhi Hu
In this work, N-doped hollow porous carbon spheres (N-HPCSs) were synthesized by silicon dioxide template-assisted polybenzoxazine (PB) coating strategy. The prepared N-HPCSs have a smooth hollow ball structure surrounded by a well-defined porous shell. Combining with in-situ plating of Bi film, the N-HPCSs were further fabricated a sensitive electrochemical platform for determination trace levels of Cd(II) by differential pulse anodic stripping voltammetry (DPASV). Under the optimized conditions, the Bi-N-HPCSs based sensor displays a linear response to Cd(II) over the range of 0.5 μg L −1 to 150 μg L −1 . Meanwhile, the limit of detection (LOD, S/N=3) is estimated to be around 0.16 μg L −1 for Cd(II), which is 31 times lower than the safety values set by United States Environmental Protection Agency (EPA) for the drinking water. Moreover, the proposed method was successfully applied to detection of Cd(II) in tap water and lake water, and the analytical results of the presented method are agreed well with inductively coupled plasma-mass spectrometry (ICP-MS) data. Due to the excellent analytical performance, the fabricated electrode is promised for future development in monitoring of cadmium pollution in the environment.
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
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Xinyi Wang,Wencheng Lin,Changming Chen,Liubing Kong,Zhuoru Huang,Dmitry Kirsanov,Andrey Legin,Hao Wan,Ping Wang
Heavy metals are harmful and it’s meaningful to achieve co-detection. In this work, fluorescence (FL) and electrochemistry (EC) dual-modal sensors combined with neural networks are proposed to detect cadmium (Cd 2+ ) and lead (Pb 2+ ) without pretreatment for the first time. Dual-modal sensing eliminates individual limitations of FL and EC and combines their superiority. Quantum dots and sea urchin-like FeOOH are used as sensitive materials, among which FeOOH is used for the first time to detect Pb 2+ with high repeatability and sensitivity. Combining with the proposed neural networks, the mean absolute error of Cd 2+ and Pb 2+ predicted are 0.2176 μg/L and 0.6002 μg/L, respectively, which are far better than traditional analysis methods. The R-Squared between the predicted value and the true value is 0.974 (Cd 2+ ) and 0.999 (Pb 2+ ), respectively, which verifies the feasibility of the designed sensor. This model eliminates the mutual interference between Cd 2+ and Pb 2+ based on the synergistic effect and can be used for low-level detection in water samples with complex background. In addition, the designed model could combine with other types of sensors to accurately monitor global-local waters. It also provides new ideas for data fusion, which expands the flexibility in environmental protection and health care.
研究领域:
环境科学
·
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Yuanjie Teng,Yuchao Zhang,Kai Zhou,Zhengxiang Yu
A disposable screen graphene-printed electrode (SGPE) was developed by directly printing the prepared graphene paste on the surface of screen-printed carbon working electrode, and a differential pulse stripping voltammetry (DPV) method combing with portable potensiostat were introduced to the rapid detection of trace Cd 2+ in rice samples. The surface morphology of SGPE was characterized by scanning electron microscope, and the graphene structure and its electrochemical activity were confirmed by Raman spectroscopy and cyclic voltammetry. Results showed that SGPE presents better conductivity than screen-printed carbon electrode or glass carbon electrode. The pre-concentration potential and time were optimized as -1.5 V and 500 s. And a pH 8.2 basic buffer was selected because OH - did not pose an interference (K sp of Cd(OH) 2 =2.5×10 -14 ) and show a good stripping current signal. The obtained results from portable potentiostat were similar to the results obtained by inductively coupled plasma mass spectrometry (ICP-MS). Therefore, the proposed SGPE and its effectively analytical method could be further improved for the realization of an ideally rapid on-site detector for trace Cd 2+ detection in rice samples.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2017
·
IF 4.95
Ya-Jie Zhang,Yi Cai,Yong-Liang Yu,Jian-Hua Wang
A miniature optical emission spectrometric (OES) system is developed by incorporating dielectric barrier discharge (DBD) microplasma as excitation source in a lab-on-valve (LOV) configuration for trace cadmium analysis. The entire system integrates bead injection (BI) sample pretreatment , post-column derivatization , in-situ nebulization and OES detection. Trace cadmium in sample solution is separated and preconcentrated by flowing through a 2-(5-Br-2-pyridylazo)-5-dethylaminophenol (5-Br-PADAP) loaded microcolumn in LOV, followed by elution with 20 μL of 0.1 M hydrochloric acid . The eluate after online derivatization with 5 μL of 0.2 M borate buffer solution containing 7.5% (v/v) ethanol is immediately transported into a pneumatic micronebulizer integrating DBD microplasma for cadmium excitation, and OES is recorded by using a charge coupled device (CCD) spectrometer. As a miniaturized analytical set-up, LOV provides an ideal sample-processing front-end with detection by DBD-OES, while introduction of DBD excitation source in LOV highly improves the analytical performances for trace metal species. With a sample volume of 1.0 mL, a detection limit of 0.06 μg L −1 and a linear range of 0.2–50 μg L −1 are achieved for cadmium, along with an enrichment factor of 38. The accuracy of the present system is confirmed by the determination of cadmium in certified reference materials, and further demonstrated by spiking recoveries of cadmium in real water samples.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）