JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2021
·
IF 5.279
Xiaoqian Xie,Mingfei Pan,Liping Hong,Kaixin Liu,Jingying Yang,Shan Wang,Shuo Wang
In this study, the rhodamine 6G hydrazide (R6GH) complex was synthesized to develop an “off–on” output platform for fluorescence and visual dual-mode analysis of lead(II) (Pb2+). The prepared R6GH complex using the heat to reflux reaction of rhodamine 6G (R6G) and hydrazine hydrate was characterized through FT-IR, MS, 1H NMR, and 13C NMR and demonstrated to have good fluorescence stability and reversibility. The microenvironment for Pb2+ detection has been optimized in detail. Under the optimal conditions, the “off–on” R6GH-based fluorescence output platform showed a good response to Pb2+ in the concentration range of 0.05–6.0 μM (R2 = 0.9851) with a limit of detection (LOD) of 0.02 μM. Furthermore, at three spiked Pb2+ levels in the selected agricultural (tap water, soil) and food (fish, shrimp) samples, the developed R6GH-based fluorescence assays obtained a significant recovery range of 84.0–102.0% (RSD < 5.0%, n = 3), which had a good correlation with the results from ICP-MS (R2 = 0.9915). The developed R6GH immobilized paper-based array sensor can reach the lower LOD (2.5 μM) for Pb2+ through the naked eye. By combining with LAB analysis, a good linear response was obtained in the Pb2+ concentration range of 1.0–50.0 μM. These results indicated that the developed R6GH probe had great application potential in accurate detection of fluorescence and rapid visual and semiquantitative screening for Pb2+.
研究领域:
分析化学
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环境科学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Fan Zhang,Jian Zhu,Jian-Jun Li,Jun-Wu Zhao
Au nanoparticles-based fluorescence quenching has been widely used for many analytes due to its high sensitivity and rapid response. However, the effects of different coating agents of Au nanorods on the assays performance remain unclear. For the first time, we demonstrated that the coating agents play a significant role in Au nanorods-based fluorescence quenching and recovery on Rhodamine 6G (R6G). Polystyrenesulfonate (PSS)-coated Au nanorods could almost totally quench the fluorescence intensity of R6G, whereas cetyltrimethyl ammonium bromide (CTAB)-coated Au nanorods and bare Au nanorods only have little effect on the fluorescence of R6G. The addition of cysteine to PSS-coated Au nanorods-R6G makes the fluorescence recover gradually, even greater than the original fluorescence intensity of R6G. Thus the PSS-coated Au nanorods-R6G could be served as a fluorescent probe to detect cysteine. The fluorescence intensity change of PSS-coated Au nanorods-R6G probe is linear with logarithm of Cys concentration over the range from 0.01 to 2.5 μg/mL. The results provide theoretical guidance for further improving Au nanorods-based fluorescence quenching and detection of protein molecules by the fluorescence off-on mechanism.
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
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2024
·
IF 3.7
Yun-qiong Yang,Yuan Zhang,Yang Liu,Feier Lin,Hao Zhang
The construction of tunable white-light-emitting materials has garnered increasing attention in the scientific community. In this study, N-doped carbon dots (N-CDs) were surface-modified with carboxylatopillar[5]arene (CP[5]) using an EDC–NHS coupling reaction to create CCDs. CCDs were then conjugated with rhodamine 6G (R6G) through host–guest interactions to fabricate the CCDs–R6G composites. These composites produced two-color fluorescence emission peaks at 447 and 557 nm when excited by a wavelength of 340 nm. Excitingly, white-light emission (0.28, 0.30) can be readily achieved by varying the R6G concentration. To further explore potential applications, a new detection method for rutin (RT) based on the inner filter effect (IFE) was developed. Experimental results verify the practicality and reliability of the fluorescence sensor based on CCDs–R6G composites for RT detection in real samples.
研究领域:
材料科学
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分析化学
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生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2022
·Vol. 14
·期 41
·4122-4126
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IF 3.532
Mingming Yan,Minglu Li,Dongning Wang,Huifang Chen
A rapid method for the determination of ethanol content is proposed and tested. A fluorescence detecting system, with a multimode fiber (MMF) sensing head, is employed. Rhodamine 6G (R6G) is applied as the fluorescent indicator. In the R6G aqueous solution, the molecules aggregate at high concentration, causing fluorescence quenching. Nevertheless, aggregation and quenching rarely occur in ethanol. Taking an ethanol and water mixture as the solvent, the photoluminescence (PL) intensity reflects the aggregation degree and the ethanol content. Based on this phenomenon, the contents of the ethanol–water mixture were measured through PL intensity detection. A limit of detection (LOD) at ∼0.1 vol% level was obtained in the range of 0–100%. Commercial Chinese baijiu and rubbing alcohol were tested and the results obtained were consistent with the label values. The detecting system is compact and of low-cost, and the detecting method is rapid, accurate and repeatable. There is good prospect of applications for the determination of ethanol content on-site.
研究领域:
分析化学
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光学工程
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产品关联
DOI
PubMed
高影响因子
Journal of Applied Spectroscopy
·
2017
·Vol. 84
·期 5
·900-905
·
IF 0.572
Zhao Zh.,Sheng L.,Su B.,Tao C.,Jing W.
The interaction between rhodamine 6G (Rh6G) and cerium sulfate was studied by the fluorescence quenching method. In a sulfuric acid medium, the interaction of Ce(IV) with Rh6G results in Rh6G fluorescence quenching. The maximum excitation wavelength (λ ex ) and the maximum emission wavelength (λ em ) are 530 nm and 555 nm, respectively. A good linearity between the relative fl uorescence intensity (ΔF) and Ce(IV) was observed in the range ~0.12–1.08 μg/mL. The detection limit was 1.4 × 10 –3 μg/mL. The optimum reaction conditions, influencing factors, and effect of coexisting substances were investigated in the experiment. We found that the concentration of Rh6G was 3.2 × 10 –6 mol/L, and the fl uorescence intensity was maximum.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
IEEE SENSORS JOURNAL
·
2024
·
IF 4.3
Yuan Feng,Huifang Chen,Neil Broderick,Simin Hong,Zhihan Zheng,Ben Xu,Chunliu Zhao,Juan Kang
Volatile organic compounds (VOC) are the main source of indoor pollution. Inhalation of excess VOC gas will cause respiratory system damage. Therefore, VOC gas detection is essential for environment monitoring. In this article, an optical fiber device for rapid detection of VOC gas was proposed. Rhodamine 6G (R6G) was taken as the fluorescence indicator. The VOC gas sensor was designed for the modulation of aggregation-caused quenching of R6G. The sensing device was fabricated with three simple steps: in the first step, a multimode fiber was tapered; in the second step, the hydrogel was coated on the tapered fiber tip; and in the last step, aggregated R6G was loaded in the hydrogel. When the senor was probed into a VOC gas chamber, the gas molecules penetrated into the hydrogel and deaggregated the R6G dimer, and then, the fluorescence of R6G was strengthened. With this spectrum change, the concentration of VOC gas could be obtained. Compared with other fiber devices for VOC gas detections, the proposed sensor has the advantages of single-end, low cost, simple preparation, fast response, and large detection range, which means a great potential for in situ detecting applications.
研究领域:
环境科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
ANALYST
·
2016
·Vol. 141
·期 19
·5527-5534
·
IF 4.033
Xiaolei Zhang,Jie Zhang,Jiamin Quan,Ning Wang,Yong Zhu
We synthesized a carbon nanotube (CNT) loaded with silver nanoparticles (AgNPs) composite as an effective surface enhanced Raman scattering (SERS) substrate via a low-cost, simple citrate reduction method. The hybrid materials were confirmed by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), ultraviolet-visible (UV-vis) spectrophotometer and Raman spectroscopy. Rhodamine 6G (R6G) was used as the probe analyte. The experimental results indicated that the detection concentration level was down to 10−14 M. Additionally, we discussed the uniformity by conducting SERS position mapping within an area of 5 μm × 5 μm; meanwhile, we performed time-course SERS mapping experiments to study the evaporation process of probe molecules of the prepared samples. Finally, we simulated the electromagnetic field distribution based on SEM images (obtained the ratio of surface area to the area of silver particles) by the finite difference time domain (FDTD) method.
研究领域:
材料科学
·
光谱学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LUMINESCENCE
·
2021
·Vol. 36
·期 5
·1300-1305
·
IF 2.464
Dunli Liu,Qiuyun Wang,Anmin Chen,Qingyi Li,Laizhi Sui,Mingxing Jin
Fluorescence quenching of rhodamine 6G by graphene oxide (GO) was investigated using steady-state fluorescence spectroscopy and ultrafast time-resolved absorption spectroscopy. The steady-state fluorescence spectra showed that rhodamine 6G fluorescence was effectively quenched by titrating the GO to the rhodamine 6G solutions. For lower GO concentrations, transient dynamic curves followed two-exponential decay parameters. For higher GO concentrations, the dynamic curves could not be fitted well, and three-exponential decay parameters were appropriate. The results indicated that there was a new transition process (electron transfer) in the exited rhodamine 6G and GO solution.
研究领域:
化学
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材料科学
·
光物理学
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DOI
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
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2017
·
IF 2.124
Jungang Cao,Haibao Lu,Min Yang,Qun Wang,Zhonglin Wei,Jianjun Li
Photoluminescence properties of Rhodamine 6G dye confined in electrospun silica fiber are investigated in this manuscript. Uniaxial tensile test and environmental stability of such hybrid fibers are examined. Homogeneous distribution of Rhodamine 6G in silica fibers is confirmed by fluorescence image. Only J-type dimers are confirmed in our electrospun Rh6G/SiO 2 hybrid fibers, and the increase of the Rh6G concentration gives rise to a progressive red shift and a broadening in the maximum emission spectra. The emission intensity of electrospun hybrid fibers can be sensitive to the temperature and the relative maximum emission intensity may decrease gradually in the whole measured temperature range.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 15
·7070-7077
·
IF 3.925
Zheng Lu,Wenxian Wei,Jingjing Yang,Qin Xu,Xiao-Ya Hu
A novel Ag triangle nanoparticles/TiO2 nanorod array (AgNTs/TNA) heterostructure was designed as a surface-enhanced Raman scattering (SERS) active substrate for the sensitive detection of Rhodamine 6G (R6G), Crystal Violet (CV), Malachite Green (MG) and Thiram in food samples. The heterostructure was constructed by simply stacking AgNTs and hydrothermally prepared rutile TNA together. On the surface of the heterostructure, the intensity of the Raman scattering intensity was about two times stronger compared with that on the AgNT substrate, using the R6G molecule as a probe. The AgNTs/TNA heterostructure could detect the SERS signal of R6G down to 10−10 M, showing excellent SERS performance. This platform has been successfully applied for the detection of CV and MG residues in crayfish. When irradiated with ultraviolet light, the SERS substrates can be cleaned and reused. This work demonstrated that the AgNTs/TNA metal–semiconductor heterostructure with high sensitivity, reproducibility and recyclability could provide an alternative reliable platform for food additive analysis.
研究领域:
材料科学
·
分析化学
·
食品安全
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2017
·
IF 4.233
Hongji Li,Jiaqi Jiang,Zirun Wang,Xiaonan Wang,Xiqing Liu,Yongsheng Yan,Chunxiang Li
A novel, sensitive sensor material combined the technique of surface enhance Raman scattering (SERS) and molecular imprinting was prepared. It was used the amino-functionalized SiO 2 nanospheres as the supporting materials and anchored Ag nanoparticles on the surface by the function of coordination between Ag + and NH 2 − . Then, it was used that the Rhodamine 6G (R6G) as the template, acrylamide (AM) as functional monomer, ethyleneglycol dimethacrylate (EGDMA) as cross-linker, 2,2′-azobis(2-methylpropionitrile) (AIBN) as initiator to prepare the core-shell molecular imprinted polymers. Prominently, the shell thickness could be controlled by the regulation of cross-linker dosage and it was found that the SERS detection signal was most obvious when the shell thickness was about 40 nm. Under the optimal condition, it was presented good linear relationship (R 2 = 0.93) between the Raman signal (at 1505 cm −1 ) and the concentration of the templates and the limit of detection was 10 −12 mol L −1 . Meanwhile, the selective experiment was proved that this materials owned specific selectivity to the template. It was confirmed that the core-shell molecular imprinted polymers were a kind of highly sensitive and selective sensor materials in the field of R6G detection.
研究领域:
分析化学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 36
·22390-22397
·
IF 3.361
Zixiang Qu,Chuane Wang,Hongdong Duan,Liqun Chi
A mercury ion sensitive fluorescent functional monomer was synthesized based on rhodamine 6G, and two highly-effective approaches about the research and development of novel macroscopic hydrogel sensor were reported. The monomer was utilized to synthesize hydrogel sensors by free radical polymerization and guest–host interaction. Hydrogel sensors have prominent selectivity to Hg2+ and can be tailored and reused, which are capable of detecting Hg2+ sensitively in flowing and standing water environment with satisfactory performance. This work is expected to open an avenue to construct novel fluorescent analysis method for Hg2+ detection.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
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