SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Xinke Wang,Xia Gao,Xiaodong Lin,Shuo Zheng,Yong Yan,Shuo Wang,Yaqing Liu
Silver ion pollution is a great threat to global environment and public healthcare today. Thus, quick, portable and sensitive assays for Ag + tracing are highly needed. Herein, a reliable fluorescent and colorimetric dual-channel assay has been constructed for Ag + detection by utilizing a terbium-based fluorescent nanomaterial (named as Tb-DPA) and a Pt/Pd nanoflower (Pt/Pd NF)-triggered reaction between N-ethyl-N-(3-sulfopropyl)-3-methylaniline sodium salt (TOPS) and 4-amino-antipyrine (4-AAP). Initially, in the sensing system containing 4-AAP, TOPS, Tb-DPA and Pt/Pd NF, TOPS and 4-AAP is catalyzed by Pt/Pd NF to produce a purple compound (called as PC1), which endows a broad UV absorption that can fully cover the emission band of Tb-DPA. Thus, the system exhibits a high UV absorption (originating from PC1) and a low fluorescence intensity (originating from Tb-DPA) which has been quenched by PC1 through a filtering effect. However, when the system meets Ag + , the oxidase-like activity of Pt/Pd NF will be inhibited, leading less amount of PC1. As a result, the system exhibits a decreased UV absorption and a recovered fluorescence intensity, both of which can be used for Ag + detection, reporting low detection limits of 3.63 nM and 1.63 nM, respectively. Specially, results from the dual-channel assay can mutually validate each other, improving the detection reliability. Moreover, this dual-mode assay shows good capability toward Ag + detection in real samples, illustrating the potential for practical applications.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2014
·
IF 4.517
Yanlin Lv,Lili Zhu,Heng Liu,Yishi Wu,Zili Chen,Hongbing Fu,Zhiyuan Tian
A new type of fluorescent probe capable of detecting Ag + and Hg 2+ in two independent channels was developed in the present work. Specifically, in CH 3 CN–MOPS mixed solvents with CH 3 CN/MOPS ratio (v/v) of 15/85, this type of probe fluoresced weakly, and the addition of Ag + remarkably induced fluorescence enhancement of the probe. In CH 3 CN–MOPS mixed solvents with the percentage of CH 3 CN increased up to 65%, the probe was highly fluorescent and addition of Hg 2+ dramatically induced the fluorescence quenching. Thus, using such single-fluorophore-based probe and tuning the polarity of the mixed solvent, Ag + , and Hg 2+ can be detected in independent channels with high selectivity and sensitivity. As a result, the mutual interference usually encountered in most cases of Ag + and Hg 2+ sensing owing to the similar fluorescence response that these two ions induced, can be effectively circumvented by using the probes developed herein.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF FOOD ENGINEERING
·
2024
·
IF 5.3
Wenna Wang,Bohao Xu,Li Cai,Lijun Zhang,Zuju Shu,Zhongbo Li
Food freshness indication labels have a broad application prospect in the field of food safety because of monitoring the freshness of food and its environment in real time, which can assist consumers in identifying the freshness of food. Herein, large-area nanofiber films with colourimetric and fluorescent dual-channel indication were prepared via electrospinning technology using fluorescein isothiocyanate (FITC) with biogenic amine response as the indicator. FITC/PVA nanofiber films resulted in enhanced thermal stability and mechanical properties. With the increase of ammonia concentration in the atmosphere, the FITC/PVA composite films exhibited a gradual change in colour from grey to orange under daylight conditions. Furthermore, the green fluorescence was observed to gradually intensify under ultraviolet (UV) light. The results of shrimp freshness monitoring demonstrated obvious colour changes under both daylight and UV light condition, which the colour of the nanofiber films underwent a transformation from yellow to dark orange (ΔE = 46.18) under daylight and from green to bright yellow-green (ΔE = 41.77) under UV light after 1 day at 25 °C. The principal reason for the colour change of the films is the release of organic amine molecules during the spoilage process of fresh shrimp, leading the deprotonation of FITC under alkaline atmosphere and the change in its molecular conformation, resulting in the colour change and fluorescence enhancement of FITC under daylight. This colourimetric and fluorescent dual-channel response nanofiber films has the potential to be utilized in the field of food freshness monitoring to ensure the safety of the food supply.
研究领域:
食品安全
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材料科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2022
·
IF 7.425
Yao Fan,Siying Che,Lei Zhang,Chunsong Zhou,Haiyan Fu,Yuanbin She
A novel dual-channel sensor array based on the “off” and “off–on” phenomenon of ZnCdSe quantum dots (QDs) - KMnO 4 system was established for the effective distinguish of 30 green teas with various species, grades and origins. Starting from optimization of QDs for the construction of the sensing system, their sensitivity and selectivity performances towards 10 representative green teas were tested first and the sensor systems based on ZnCdSe QDs were finally established. An obvious “off” response brought by the interactions between amino acids , quercetin, et al. and ZnCdSe QDs was obtained while an “off–on” phenomenon brought by the interactions between catechins and the ZnCdSe-KMnO 4 system had also been verified. Furthermore, based on the differential fluorescence “off–on” response of seven catechins, the qualitative and quantitative analyses of these catechins were successfully carried out with the linear range from 0.5 to 10 µg/mL. Most importantly, through adopting the dual-channel sensor, 30 green teas with different species, origins and grades can be accurately identified with the LDA model according to the spectral signals and the recognition accuracy could achieve 100 %.
研究领域:
分析化学
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食品科学
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生物传感技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 14
·4877-4887
·
IF 7.393
Li Xiao,Kaiqi Liu,Lian Duan,Xinjian Cheng
The detection and removal of heavy metals in the environment is urgent and meaningful. In this work, two types of fluorescent functionalized silks OSP and ASP have been prepared using worm silk as the substrate. These fluorescent silk probes exhibit an obvious fluorescence quenching effect in the presence of Hg2+ or Ag+, enabling silk to specifically detect Hg2+ or Ag+. An obvious color response occurs under visible light, from yellow to brown or gray, thereby realizing dual-channel identification of fluorescence and colorimetry. In addition, its sensing mechanism has been studied, and it is found that the probe reacts with metal ions as a reactive response. Compared with the fluorescent probes bearing one CC/CC bond, the probes with two terminal CC/CC bonds are more sensitive. And the excellent recognition ability can make the limit of detection as low as 0.25 μM. This indicates that silk fluorescent probes can be used to detect Hg2+ and/or Ag+.
研究领域:
生物化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Haoqi Guo,Mengxi Fu,Rui Du,Razium Ali Soomro,Li Guo,Xin Huang,Mimi Wang,Chunming Yang,Danjun Wang
The inefficient charge separation and transport remains a bottleneck in photocatalysis. While various strategies have been explored to improve this process, most focus on single-sided modulation either the conduction-band electrons or valence-band holes, limiting overall improvement. Herein, an innovative coupling modification approach is adopted where Ru and α-Fe 2 O 3 (FO) nanoparticles are integrated onto ZnIn 2 S 4 (ZIS) to prepare Ru/ZnIn 2 S 4 /α-Fe 2 O 3 , and constructs dual charge transfer pathways for electrons and holes. This bidirectional channel configuration significantly enhances carrier separation and accumulation, enabling Ru as an electron (e − ) mediator and FO as a hole (h + ) extraction facilitator, driving simultaneous redox reactions, and enabling substantial improvement in the photocatalytic sulfur oxidation process coupled with hydrogen generation. This approach enhances interface charge separation/spatial accumulation and provides valuable guidance for designing and developing advanced high-efficiency photocatalytic systems.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Sha Li,Wei Wen,Yu Hao,Jun Zheng,Xingao Zhang
Hydrazine (N 2 H 4 ) and sulfur dioxide (SO 2 ) play important roles in environmental systems and organisms, but their excessive intake can lead to several diseases. Due to the lack of two-color probes capable of distinguishing between N 2 H 4 and SO 2 , we synthesized a novel dual-channal NIR fluorescent probe PI-CO-NH based on piperazine-substituted benzopyranone salts and coumarin carboxylic acids, which is a dual-function probe capable of detecting SO 2 and N 2 H 4 . When detecting N 2 H 4 , PI-CO-NH showed rapid fluorescence changes at 447 nm and 633 nm emission channels, and both blue and red light gradually increased with the increase of N 2 H 4 concentration. After adding SO 2 , the double bond on benzopyrrole was broken and the red fluorescence was quenched. The experimental results show that the probe has high selectivity and sensitivity, excellent stabilit and high cell permeability, can visualize N 2 H 4 and SO 2 in living cells, and has good mitochondrial targeting ability. More importantly, the ability of PI-CO-NH to detect N 2 H 4 in different soil samples and test strips was successfully verified. These experiments not only validate the applicability of the probe in complex environment, but also provide a strong basis for the future application of PI-CO-NH in environmental pollution detection.
研究领域:
生物化学
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环境科学
·
医学检测
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Weiran Zhu,Nan Hao,Chen Chen,Yu Qiu,Yanli Zuo,Jie Wei,Jing Qian,Kun Wang
The performance-enhancing strategy of a single pathway for perovskite has been widely studied. In this work, the dual-pathway strategy of A-site Ce substitution and nitric acid selective dissolution was proposed. The catalytic oxidation performance of LaMnO3 exhibits the characteristic of hierarchical regulation, that is, a steplike improvement, which avoids the limitation of performance improvement of the single pathway. The B-site Mn with catalytic activity was in situ reconstituted on the surface to build a Mn-rich surface. The obtained sdLa0.7Ce0.3MnO3 has the advantages of good oxygen mobility, high Mn4+/Mn3+ molar ratio, and large specific surface area, and this material showed excellent catalytic oxidation performance for organics, which can realize colorimetric chemical oxygen demand detection at room temperature. Here, Ce substitution improved the oxidation capacity by improving the oxygen mobility and the ratio of Mn4+/Mn3+, and further nitric acid treatment not only accelerated the in situ reconstruction of B-site Mn but also increased the specific surface area.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Silong Wang,Yan Wang,Jinquan Wan,Yongwen Ma,Zhicheng Yan,Guihua Zhang
With high redox ability of electrons and holes, Z-scheme heterojunction is a promising composite structure in the photocatalysis. However, it is challenging to inhibit the recombination of carriers by Z-scheme transfer. Herein, a novel Ag 3 PO 4 /AgBr/Ti 3 C 2 Tx hybrid with dual channel carrier transfer structure was fabricated. Ti 3 C 2 Tx not only serves as a template for growth of Z-scheme Ag 3 PO 4 /AgBr, but also can be used to accommodate holes transferred from Ag 3 PO 4 and AgBr. The first channel is consisted of Z-scheme transfer of carriers in Ag 3 PO 4 /AgBr. And the hole transfer from the AgBr valence band to Ti 3 C 2 Tx constitutes the second channel, which avoids directly carrier recombination in AgBr valence band. Dual channel carrier transfer pathway was proved by in situ irradiated X-ray photoelectron spectroscopy (ISI-XPS). After Ti 3 C 2 Tx was introduced, the quantum efficiency of Ag 3 PO 4 /AgBr increased from 10.59% to 12.50% with reducing Cr(VI), indicating an increase in carrier utilization. The improvement of the degradation efficiency of rhodamine B from 80.77% to 94.72% is benefited from the enhanced quantum efficiency. The dual channel carrier transfer heterojunctions design provides a new idea for constructing an efficient composite photocatalytic structure.
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 AGRICULTURAL AND FOOD CHEMISTRY
·
2022
·
IF 5.895
Siying Che,Xiutan Peng,Yiwan Zhuge,Xinlan Chen,ChunSong Zhou,Haiyan Fu,Yuanbin She
Detection of pesticide paraquat (PQ) is of considerable significance to ensure food safety, and its rapid and on-site detection is still a challenge. Aimed at the ion characteristics of PQ, an “enrichment and detection” strategy was proposed to improve the sensitivity through electrostatic attractions, and the ion characteristic of probes was adopted to increase the portability through avoiding aggregation-caused quenching effects in the paper strips. Herein, a novel anion-functionalized ionic liquid (IL) probe with a large conjugated plane and rich π-electrons ([Fluo][P66614]2) was designed as a fluorescent and colorimetric dual-channel probe to sensitively and rapidly detect trace amounts of PQ in vegetables and the environment. The proposed probe exhibited good linearity with a detection limit of 64.0 nM in the PQ concentration range of 0.3–7.0 μM (fluorometry) and 0.1 μM in that of 0.1–8.0 μM (colorimetry), respectively. In addition, it displayed a rapid fluorescence quenching response from green to dark (<5 s) and excellent anti-interference (among 23 other pesticides) due to dual effects of electrostatic attraction and π–π stacking. Most importantly, the lipophilic IL probe could be applied in real vegetables and environmental samples with a satisfying recovery rate of 98–103% and assembled into a handy paper strip that achieved the visual semiquantitative detection of PQ. This ionic probe provides a feasible approach for rapidly and conveniently detecting PQ for ensuring agricultural and food safety and opens a new avenue to detect ion-responsive analytes in real complex samples by an “enrichment and detection” strategy.
研究领域:
分析化学
·
食品安全
·
环境科学
✓ 已验证
DOI
高影响因子
Nano-Micro Letters
·
2022
·Vol. 14
·期 1
·1-18
·
IF 23.655
Cao Wentao,Wang Zheng,Liu Xiaohao,Zhou Zhi,Zhang Yue,He Shisheng,Cui Daxiang,Chen Feng
A bioinspired MXene-based user-interactive electronic skin (e-skin) for digital and visual dual-signal sensing was designed and fabricated.
The MXene-based e-skin exhibited an excellent electromechanical sensing performance and realized the real-time monitoring of human activities, such as handwriting, drinking, walking, and speaking.
Benefiting from the outstanding Joule-heating performance of MXene-based film, the e-skin with thermochromic pigments could realize a wider range and dynamic coloration for passive displays and visual recognition of various human motions.
研究领域:
材料科学
·
生物医学工程
·
传感器技术
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Pengjuan Ni,Chuanxia Chen,Yuanyuan Jiang,Chenghui Zhang,Bo Wang,Bingqiang Cao,Cuncheng Li,Yizhong Lu
Here, based on their bifunctional peroxidase-mimicking activity and fluorescence of bovine serum albumin-stabilized gold nanoclusters (BSA-AuNCs), we develop a colorimetric and fluorescent dual-channel assay for alkaline phosphatase activity determination. The peroxidase-like activity of BSA-AuNCs makes it possible to catalyze the oxidation of colorless 3,3′,5,5′-tetramethylbenzidine (TMB) into its blue product (oxTMB) in the presence of H 2 O 2 , and result in the fluorescence quench of BSA-AuNCs simultaneously due to the inner filter effect between oxTMB and BSA-AuNCs. While the ascorbic acid generating form alkaline phosphatase (ALP)-catalyzed hydrolysis of L-ascorbic acid-2-phosphate can inhibit the oxidation of TMB, thereby inducing decolorization of oxTMB and fluorescence recovery of BSA-AuNCs. Based on these findings, a dual-readout assay for ALP activity sensing using BSA-AuNCs has been reported for the first time. The detection limitation can reach as low as 0.26 and 0.16 mU mL -1 by colorimetric and fluorescent method, respectively. Moreover, the developed assay has been successfully applied to detect ALP in human serum samples with satisfactory results. This method may not only offer new idea for simple, sensitive and accurate detection of ALP activity, but also broaden the applications of BSA-AuNCs in bioanalysis.
研究领域:
生物化学
·
医学诊断
·
纳米生物学
✓ 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）