SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2021
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IF 4.098
Lingyuan Liu,Qianyi Zhang,Feng Li,Mei Wang,Jing Sun,Shuyun Zhu
Herein, fluorescent DNA-templated silver nanoclusters (DNA-AgNCs) with red emission were synthesized and utilized as novel probe to detect D-penicillamine (D-Pen) for the first time. D-Pen molecules contain a thiol which can combine with Ag to form a non-fluorescent ground state complex, inducing the aggregation of DNA-AgNCs followed by the fluorescence quenching. The quenching mechanism is well-studied and found to be a static quenching process. This method can detect D-Pen in the range of 0.025–0.7 μM with the detection limit as low as 8 nM, which is 1–3 orders of magnitude more sensitive than those based on other fluorescent nanoprobes. More importantly, the preparation procedure for DNA-AgNCs is fast and without the requirement of heavy metal ions. Thus, this detection strategy is time-saving and eco-friendly. Satisfactory recoveries have been acquired for monitoring D-Pen in human serum samples and pharmaceutical samples owing to the high sensitivity.
研究领域:
生物化学
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分析化学
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医学诊断
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PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Wudong Liu,Jie Zhang,Xiangbiao Yin,Xinyi He,Xinpeng Wang,Yuezhou Wei
Through a simple hydrothermal reaction , LEuH-Cl (where LEuH and Cl denote layered europium hydroxide and a chlorine ion, respectively) was synthesized. Its structure and properties were similar to those of layered double hydroxides (LDHs). The material was composed of europium hydroxide host layers with a positive charge and a guest interlayer with chlorine ions. The hydrotalcite-like structure gives it excellent anion exchange abilities, and the host shows an intense photoluminescence (PL), mainly through 5 D 0 → 7 F J (J = 0,1,2,3, and 4). MnO 4 − or Cr 2 O 7 2− can be directly adsorbed by LEuH-Cl in an aqueous solution due to the large number of exchangeable chlorine ions, thereby resulting in a static quenching effect (SQE) and forming an inner filter effect (IFE) system, which leads to the direct quenching of the PL intensity. Based on this characteristic, the concentration of these two substances in an aqueous solution can be detected quickly and simply. Based on the experimental results, LEuH-Cl exhibited high selectivity and sensitivity toward MnO 4 − and Cr 2 O 7 2− in an aqueous solution. The detection limits of MnO 4 − and Cr 2 O 7 2− were calculated to be 3.43 and 1.19 μM, respectively. This proved the feasibility of using the material for the direct detection of multiple substances. The quenching caused by the anion exchange of layered rare-earth hydroxides (LRHs) was further explored.
研究领域:
材料科学
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环境科学
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高影响因子
MICROCHIMICA ACTA
·
2017
·Vol. 185
·期 1
·1-9
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IF 4.58
Cui Malin,Wang Chan,Yang Dapeng,Song Qijun
Fluorescent iridium nanoclusters (IrNCs) consisting of up to 7 Ir atoms were prepared by heating IrCl 3 in N,N-dimethylformamide. No other reagents are required. High resolution transmission electron microscopy (HRTEM) shows the IrNCs to be monodispersed with an average size of 0.9 ± 0.2 nm. They are well soluble in polar solvents and stable in these solvents for at least 6 months. Under photoexcitation with 365 nm light, they emit strong bluish green fluorescence with peaks that depend on the excitation wavelength and range from 530 to 650 nm. The fluorescence lifetime typically is 2.2 ns and the quantum yield is 8.3%. Fluorescence is quenched by Cr(VI) ion (chromate), and the emission peak is gradually red-shifted. According to the absorbance spectra of IrNCs in the presence and absence of Cr(VI) and Stern-Volmer quenching behavior study, static quenching is involved. Based on these findings, a selective assay was developed for the determination of Cr(VI). It has a linear response in the 0.1 to 100 μM chromate concentration range and a 25 nM detection limit. Fluorescent iridium nanoclusters (IrNCs), consisting of up to 7 Ir atoms, were prepared in N,N-dimethylformamide (DMF) solution without using any other reagents. Their fluorescence is statically quenched by Cr(VI).
研究领域:
分析化学
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环境科学
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高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
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2024
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IF 4
Qin Hu,Qiuyan Mao,Yikun Cui,Shiyun Gong,Lixia Xiao,Xiaojuan Gong,Tianzhu Guan,Zhen-quan Yang
This work made the first attempt to construct a florescence assay based on CDs@FMs (carbon dots-based fluorescence microspheres) for ultrasensitively probing malachite green (MG). Through static quenching and inner filter effect (IFE), the 581-nm emission peak of CDs@FMs could be significantly suppressed by MG. Our results demonstrated two good linear fluorescence responses for MG in the concentration scopes of 0.01–0.1 μM and 0.1–10.0 μM, respectively. Strikingly, the detection limits (LODs) achieved were down to picometer (56.7 pM) and nanometer levels (0.57 nM). Furthermore, this method exhibited good consistency with the HPLC results when applied for quantitatively screening MG from fish samples. Our current research highlights a promising application of CDs@FMs for enhanced MG probing in aquatic products with the merits of rapidity, simplicity, high accuracy and stable signal readout.
研究领域:
分析化学
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食品安全
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环境科学
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DOI
高影响因子
DYES AND PIGMENTS
·
2023
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IF 4.5
Lei Jiang,Lin Yuan,Yingying Xiang,Fei Song,Wenjun Jiang,Xiuling Ji,Yujiao Tu
Arsenic is a toxic heavy metal element and widely distributed in nature, however, long-term exposure to low doses of arsenite (As 3+ ) is harmful to human health. Therefore, it is particularly important to establish a quick and sensitive detection method for As 3+ in the environment. Yellow fluorescent carbon dots were prepared by hydrothermal method with rhodamine B and citrate as precursors. The RbB-CDs were purified by thin layer chromatography and chromatographic column. The good line ranges of 0–5 μg/L and 10–50 μg/L As 3+ were obtained with low detection limits of 0.75 μg/L and 5.00 μg/L based on fluorescence, respectively, while a good line range of 0–50 μg/L was obtained with a low detection limit of 3.03 μg/L based on UV absorbance. Furthermore, static quenching was verified to work in the quenching process of As 3+ towards RbB-CDs fluorescence. In addition, the yellow fluorescent nanoprobe was employed to determine the As 3+ content in tap water, lake water, and river water samples. It showed good potential to detect As 3+ in the environment.
研究领域:
环境科学
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分析化学
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DOI
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 7
·4952-4957
·
IF 4.6
Tingyu Zhang,Tingting Cai,Yi Zhang,Tanlai Yu
Persulfate, a powerful oxidizing agent, is extensively employed in numerous industries. Accurate and rapid detection of persulfate (S2O82−) is essential. This study reports the development of a fluorescent sensor based on Am-CDs. It is synthesized from ascorbic acid (AA) and m-phenylenediamine (m-PD) through a one-step hydrothermal method. The fluorescence of Am-CDs demonstrated selective sensitivity to S2O82− via static quenching. A sensitive fluorescent sensor was constructed for S2O82−, exhibiting a linear detection range of 1.96 to 15.59 μM with a limit of detection (LOD) of 0.94 μM. This fluorescence method was successfully applied to detect S2O82− in water samples, achieving recoveries of 98.07% to 102.33%. The fluorescent sensor developed in this study offers a simple and effective method for quantifying S2O82− in aquatic environments.
研究领域:
分析化学
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环境科学
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PubMed
高影响因子
Journal of Materials Chemistry B
·
2019
·Vol. 8
·期 16
·3542-3549
·
IF 5.047
Mohamed Ibrahim Halawa,Fengxia Wu,Muhammad Nadeem Zafar,Islam M. Mostafa,Abubakar Abdussalam,Shuang Han,Guobao Xu
In this work, a glutathione (GSH) sensing nano-platform using lucigenin as a fluorescent probe in the presence of MnO2 nanosheets was reported for the first time. Unlike the earlier fluorescent detection systems based on MnO2 nanosheets, which depend on Förster resonance energy transfer (FRET) or the dynamic quenching effect (DQE), the mechanism of the quenching process of MnO2 nanosheets on lucigenin fluorescence was attributed mainly to a static quenching effect (SQE) with a minor contribution of the inner filter effect (IFE). A double exponential fluorescence decay of lucigenin was obtained in various MnO2 nanosheet concentrations as a result of their SQE and IFE. Based on this phenomenon and taking advantage of the redox reaction between GSH and MnO2 nanosheets, we have developed a switch-on sensitive fluorescent method for GSH via the recovery of the MnO2 nanosheet-quenched fluorescence of lucigenin. A good linearity range of 1.0–150.0 μM with a low limit of detection (S/N = 3) of 180.0 nM was achieved, revealing the higher sensitivity for GSH determination in comparison with the previously reported MnO2 nanosheet-based turn-on fluorescent methods. The developed fluorescent nano-platform exhibits excellent selectivity with successful application for GSH detection in human serum plasma, indicating its good practicability for GSH sensing in biological and clinical applications.
研究领域:
分析化学
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生物医学工程
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纳米技术
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PubMed
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2015
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IF 2.912
Hua Xu,Xiupei Yang,Gu Li,Chuan Zhao,Xiangjun Liao
A simple, economical, and green method for the preparation of water-soluble, high-fluorescent carbon quantum dots (C-dots) has been developed via hydrothermal process using aloe as a carbon source. The synthesized C-dots were characterized by atomic force microscope (AFM), transmission electron microscopy (TEM), fluorescence spectrophotometer, UV–vis absorption spectra as well as Fourier transform infrared spectroscopy (FTIR). The results reveal that the as-prepared C-dots were spherical shape with an average diameter of 5 nm and emit bright yellow photoluminescence (PL) with a quantum yield of approximately 10.37%. The surface of the C-dots was rich in hydroxyl groups and presented various merits including high fluorescent quantum yield, excellent photostability, low toxicity and satisfactory solubility. Additionally, we found that one of the widely used synthetic food colorants, tartrazine, could result in a strong fluorescence quenching of the C-dots through a static quenching process. The decrease of fluorescence intensity made it possible to determine tartrazine in the linear range extending from 0.25 to 32.50 μM, This observation was further successfully applied for the determination of tartrazine in food samples collected from local markets, suggesting its great potential toward food routine analysis. Results from our study may shed light on the production of fluorescent and biocompatible nanocarbons due to our simple and environmental benign strategy to synthesize C-dots in which aloe was used as a carbon source.
研究领域:
分析化学
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食品安全
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纳米材料
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DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2023
·Vol. 41
·期 24
·3677-3683
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IF 5.4
Jingwen Zhao,Junchen Wang,Linggao Zeng,Sen Zhou,Xiaoming Yang
Comprehensive Summary Long-wavelength fluorescence carbon dots (CDs) show great importance in multiple fields, especially for the biochemical sensing. Here, we proposed one type of CDs doped with nitrogen and sulfur through the hydrothermal method, which exhibited obvious yellow-fluorescence in aqueous solution. Importantly, the fluorescence intensity of CDs decreased with pH decreasing in the acidic range, thus a linear relationship between pH and fluorescence intensity was established, exhibiting the potential of pH sensing. Additionally, introducing tigecycline into CDs resulted in their decreased fluorescence, thus, we further established a strategy of detecting tigecycline with the concentration range of 200 μM to 7 nM. Meanwhile, we elucidated the static quenching as the major mechanism for CDs responding tigecycline, which was induced by the formed new complex between CDs and tigecycline. Furthermore, the practicality of the method was verified by examining the recovery of tigecycline in the actual lake-water samples.
研究领域:
生物化学
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分析化学
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高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2015
·Vol. 15
·期 6
·4276-4284
·
IF 1.556
Zhu Yuanna,Yang Ping,Miao Yanping,Cao Yongqiang,Yang Yang
The photoluminescence (PL) quenching of thioglycolic acid (TGA)-capped CdTe quantum dots (QDs) by glutathione (GSH)-capped Au nanocrystals (NCs) were investigated via PL degradated measurement. It was found that the PL of the QDs with several sizes can be effectively quenched by GSH-Au
NCs. The size and PL peak wavelengths of QDs have no significant impact on the quenching processing. Through the characterizations of UV-visble absorption spectrum, Zeta potential and steady-state, and time-resolved fluorescence spectroscopy, it was proved that the PL quenching of the QDs
by GSH-Au NCs was attributed to static quenching caused by the formation of a QDs- Au complex. The binding parameters calculated from modified Stern–Volmer equation showed that the binding affinities between the GSH-Au NCs and CdTe QDs was in the order of 105 L ·mol−1,
which indicated that the binding force was larger and the effective quenching occurred. The thermodynamic parameters studies revealed that the binding was characterized by positive enthalpy and positive entropy changes and hydrophobic force played a major role for QDs-Au association. In addition,
all the quenching experiments were conducted in the phosphate-buffered saline (PBS) buffer solution at pH 7.4 and the investigation is expected to be applied in the biology.
研究领域:
材料科学
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生物医学工程
·
化学
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DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2020
·
IF 6.306
Shufen Wu,Xiaochan Wang,Yuxin Bao,Chuanying Zhang,Huanhuan Liu,Zhenjing Li,Mianhua Chen,Changlu Wang,Qingbin Guo,Xin Peng
Monascin (MS) is a yellow lipid-soluble azaphilonoid pigment identified from Monascus -fermented products with promising biological activities. This work studied interactions between MS and bovine serum albumin (BSA) as well as their influences on the antioxidant activity of MS. Experimental results demonstrated that the fluorescence emission of BSA was quenched by MS via static quenching mechanism and the formed BSA-MS complex was mainly maintained by hydrophobic and hydrogen bond interactions. Meanwhile, the probable binding pocket of MS located near site I of BSA and the corresponding conformational and structural alterations of BSA were determined. Furthermore, the molecular modeling approach was performed to understand the visual representation of binding mode between BSA and MS. It was noticeable that the BSA-MS complex exhibited reduced DPPH radical-scavenging ability, which might be attributed to the restraining effect of BSA on the relevant reaction pathways involved in antioxidation by MS.
研究领域:
生物化学
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食品科学
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分子生物学
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PubMed
高影响因子
Food Additives and Contaminants Part A-Chemistry Analysis Control Exposure & Risk Assessment
·
2021
·
IF 3.057
Qin Hu,Huijuan Sun,Lingfei Liu,Lixia Xiao,Zhen-Quan Yang,Shengqi Rao,Xiaojuan Gong,Jie Han
A high-efficiency spectrophotometric method based on nitrogen-doped fluorescent carbon dots (N-FCDs) was developed for the ultrasensitive determination of carmine (CRM) in foodstuffs. The N-FCDs were fabricated via a one-pot hydrothermal method with m-phenylenediamine as the starting material. The detection principle was based on the fluorescence quenching effect of N-FCDs by CRM, where their interaction was due to the inner filter effect (IFE) and static quenching. A good linear relationship was established for CRM detection in a concentration range of 0.1–10.0 μM with a detection limit as low as 11.2 nM. The proposed method achieved satisfactory results for CRM determination in commercial food products with recoveries better than 98.6% and relative standard deviations (RSDs) less than 4.07%. The method established in this study was simple, ultrasensitive and reliable for rapid detecting CRM in a food matrix, which could be potentially used as a useful sensing agent for the analysis of additive food colourants.
研究领域:
分析化学
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食品安全
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产品关联
DOI
PubMed
高影响因子
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