FOOD CHEMISTRY
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2024
·
IF 8.5
Mingzhe Jiang,Min Wang,Wenjing Lai,Chenglin Hong,Xuetong Song,Siyu Chen
Mycotoxin contamination currently poses a significant concern and presents a major challenge to global food safety management. In this research, gold‑silver nanoclusters (Au-AgNCs) were utilized as platforms for electrogenerated chemiluminescence (ECL) and electrochemical (EC) responses, while polyaniline-coated cobalt tetraoxide and gold (PANI@Co 3 O 4 /AuNPs) served as bifunctional probes with intelligently modulated light/electric signals to develop a dual mode adaptor sensor for sensitive detection of alternariol (AOH). The sensor's benefits are evident in three areas:(1) Bandgap modulation allows Au-Ag to exhibit enhanced light/electric response;(2) PANI@Co 3 O 4 /AuNPs exhibit both ECL quenching effects and the capability to activate KHSO 5 , along with improved electrical conductivity, which collectively improves the sensor's detection performance;(3) The dual-channel signal outputs significantly reduce the risk of false detections. Testing results indicated that the ECL and EC sensors performed exceptionally well across AOH concentration ranges of 0.001–100 ng/mL and 0.01–1000 ng/mL, with detection limit of 0.803 pg/mL and 0.378 pg/mL, respectively.
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高影响因子
MOLECULES
·
2025
·Vol. 30
·期 6
·1347
·
IF 4.6
Zhengzheng Yan,Lujie Wang,Fei Yan
Carcinoembryonic antigen (CEA) is an important tumor biomarker for the early clinical diagnosis of various cancers, and, therefore, the accurate and sensitive quantitative determination of CEA is of vital significance. In this study, we demonstrated the in situ growth of Au nanoparticles (AuNPs) on nitrogen-doped graphene quantum dots (N-GQDs) decorated reduced graphene oxide (rGO) nanocomposites by using simple drop-coating and electrochemical deposition methods. N-GQDs@rGO can be formed through the π–π stacking interaction and possesses a high specific surface area and many functional groups, providing lots of anchor sites (amino moieties in NGQDs) for the in situ electrochemical growth of AuNPs without the addition of reductants and protective agents. Such AuNPs/N-GQDs@rGO ternary nanocomposites combine the characteristics of three nanomaterials, showing a large surface area, excellent solubility, good conductivity, catalytic activity, a simple fabrication process, and notable stability, which are further used to construct a label-free electrochemical immunosensor for the determination of CEA. Under the optimized experimental conditions, the AuNPs/N-GQDs@rGO-based electrochemical immunosensor achieves a broad linear response, ranging from 1 pg/mL to 0.5 μg/mL and a low detection limit of 0.13 pg/mL. Moreover, the AuNPs/N-GQDs@rGO-based electrochemical immunosensor shows exceptional selectivity, anti-interference, and anti-fouling capabilities for the direct analysis of CEA amounts in fetal bovine serum samples, showing vast potential in the clinical screening of cancer.
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高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2015
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IF 5.33
Xiaolei Zhang,Jingjing Deng,Yumeng Xue,Guoyue Shi,Tianshu Zhou
In this study, we demonstrate a colorimetric and fluorescent dual-mode method for alkaline phosphatase activity (APA) sensing in freshwater lake with stimuli-responsive gold nanoparticles@terbium-guanosine monophosphate (Au-NPs@GMP-Tb) core–shell nanoparticles. Initially, the core–shell nanoparticles were fabricated based on Au-NPs decorated with a fluorescent GMP-Tb shell. Upon being excited at 290 nm, the as-formed Au-NPs@GMP-Tb core–shell nanoparticles emit green fluorescence, and the decorated GMP-Tb shell causes the aggregation of Au-NPs. However, the addition of ALP destroys GMP-Tb shell, resulting in the release of Au-NPs from the shell into the solvent. As a consequence, the aggregated Au-NPs solubilizes with the changes in the UV–vis spectrum of the dispersion, and in the meantime, the fluorescence of GMP-Tb shell turns off, which constitutes a new mechanism for colorimetric and fluorescent dual-mode sensing of APA. With the method developed here, we could monitor the dynamic change of APA during an algal bloom of a freshwater lake, both by the naked eye and further confirmed by fluorometric determination. This study not only offers a new method for on-site visible detection of APA but also provides a strategy for dual-mode sensing mechanisms by the rational design of the excellent optical properties of Au-NPs and the adaptive inclusion properties of the luminescent infinite coordination polymers.
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高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2026
·
IF 6.7
Yaxiling Wang,Yaping Yu,Jing Lin,Chunyuan Zhu,Jing Qiu,Peiwen Hu,Nan Zhang
Critical to sensor performance in real agricultural matrices are high interference resistance and prevention of false-positive/negative signals. To address this, a Z-scheme BiOI nanoflakes (NFs)/Au NPs/TiO2 NPs heterojunction was designed with photocurrent-polarity-switching capability, an inherent feature that could minimize interference from oxidative and reductive species. Subsequently integrated Fe3O4 NPs with catalase-mimicking activity suppressed the photocurrent response to baseline levels, substantially reducing the background noise. In the presence of glyphosate (Gly), the quenching effect was inhibited, leading to a “signal on–off–on” photoelectrochemical (PEC) detection mode. In addition, the inherent magnetism of Fe3O4 NPs enhanced the specificity by facilitating the efficient removal of nonbound interferents and enabling “split-type” PEC detection processes. This approach achieved Gly quantification within a linear range of 0.05–5 mg·L–1, with practical applicability demonstrated in three agricultural matrices. By strategically integrating heterojunction engineering with magnetic nanozyme signaling, this work establishes a PEC sensing paradigm exhibiting exceptional anti-interference capability.
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高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 6
·1-10
·
IF 5.3
Qu Xiangwen,Zhou Pengwei,Shi Boya,Zheng Yekai,Kan Lian,Jiang Li
A multifunctional surface-enhanced Raman scattering (SERS) platform integrating sensitive detection and drug resistance analysis was developed for Gram-positive bacteria. The substrate was based on self-assembled Ti 3 C 2 T x @Au NPs films and capture molecule phytic acid (IP6) to achieve specific capture of Gram-positive bacteria and different bacteria were analyzed by fingerprint signal. It had advantages of good stability and homogeneity (RSD = 8.88%). The detection limit (LOD) was 10 2 CFU/mL for Staphylococcus aureus and 10 3 CFU/mL for MRSA, respectively. A sandwich structure was formed on the capture substrate by signal labels prepared by antibiotics (penicillin G and vancomycin) and non-interference SERS probe molecules (4-mercaptobenzonitrile (2223 cm −1 ) and 2-amino-4-cyanopyridine (2240 cm −1 )) to improve sensitivity. The LOD of Au NPs@4-MBN@PG to S. aureus and Au NPs@AMCP@Van to MRSA and S. aureus were all improved to 10 CFU/mL, with a wide dynamic linear range from 10 8 to 10 CFU/mL ( R 2 ≥ 0.992). The SERS platform can analyze the drug resistance of drug-resistant bacteria. Au NPs@4-MBN@PG was added to the substrate and captured MRSA to compare the SERS spectra of 4-MBN. The intensity inhomogeneity of 4-MBN at the same concentrations of MRSA and the nonlinearity at the different concentrations of MRSA revealed that MRSA was resistant to PG. Finally, the SERS platform achieved the determination of MRSA in blood. Therefore, this SERS platform has great significance for the determination and analysis of Gram-positive bacteria. Graphical Abstract
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