DIAMOND AND RELATED MATERIALS
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2024
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IF 4.3
Zhengpei Nie,Wenyu Zhong,Jiaman Liang,Qunwei Shu,Kejun Tan
Biomass carbon dots (CDs) typically suffer from red fluorescence quenching in water, limiting their practical applications. This study introduces a simple pH regulation strategy to enhance water-solubility by converting lipophilic surface groups to hydrophilic ones. Using mugwort as a precursor, novel triple-emission biomass-based CDs (T-CDs) with good water-solubility were successfully synthesized. Comprehensive structural and spectral characterizations were performed to elucidate the properties of the T-CDs and the origins of their luminescence, providing valuable insights for the design of future CDs. The T-CDs were further modified with hexadecyl trimethyl ammonium bromide (CTAB), producing modified triple-emission CDs (mT-CDs) with enhanced photostability. These mT-CDs were effectively employed as fluorescent probes for selective dopamine (DA) sensing, achieving a linear range of 0.8 to 300 μM and a limit of detection (LOD) of 0.17 μM, demonstrating their potential in biochemical applications. To explore additional applications, mT-CDs were incorporated into polyvinyl alcohol (PVA) to create thin films. These films exhibit pink fluorescence under 254 nm UV light and phosphorescence after the UV source is removed, making them suitable for information encryption and anti-counterfeiting purposes.
研究领域:
材料科学
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生物传感
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化学工程
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DOI
高影响因子
Green Energy & Environment
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2020
·
IF 6.395
Jiaqi Wu,Lei Zhang,Jinxing Long,Qiang Zeng,Biaolin Yin,Xuehui Li
Ionic liquids (ILs) have attracted increasing attention since last few decades due to their high molecular design abilities and wide applications in different fields. In this study, four novel fluorescent isoquinolino [2,1-a]quinoxalin-5-ium ILs were designed and synthesized via a two-step process including a simple dual Schiff's base formation and a subsequent [RhCp∗Cl 2 ] 2 -catalyzed oxidative C–H activation/annulation reaction. The as-synthesized ILs were extensively characterized using FT-IR, 1 H-NMR, 13 C-NMR, 19 F-NMR, HSQC-NMR, HMBC-NMR and HR-MS. Their photophysical properties were determined by steady-state fluorescence spectroscopy. The results demonstrate that all these ILs showed dual or triple emissions, large stokes shift (90 nm) and mechanochromic behaviors. Basing on solvatochromism and titration experiments, it is thought that the emission bands of the ILs are raised from their local excited states, charge transfer states or excited state proton transfer of cations, while the substitute effect of these quinoxaline derived ILs on their stokes shifts is negligible.
研究领域:
化学
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材料科学
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DOI
高影响因子
ACS Sensors
·
2023
·
IF 8.9
Bangxiang Liu,Zheng Tang,Jianming Pan,Jinjin Liu,Hengjia Zhu,Panwang Hu,Xiangheng Niu
Given that intricate toxicological profiles exist among different antibiotics and pose serious threats to the environment and human health, synchronous analysis of multiple residues becomes crucial. Sensor arrays show potential to achieve the above purpose, but it is challenging to develop easy-to-use and high-sensitivity tools because the state-of-the-art arrays often require more than one recognition unit and are monosignal dependent. Here we exquisitely designed a fluorescent nanoprobe (2-aminoterephthalic acid-anchored CdTe quantum dots with Eu3+ coordination, CdTe-ATPA-Eu3+) featuring triple emissions at the same excitation as the only element to fabricate a luminescent sensor array with ratiometric calculations for identifying multiple antibiotics. By taking tetracycline, chlortetracycline, doxycycline, oxytetracycline, penicillin G, and sulfamethoxazole as models, the six species exhibited distinguishable motivation or/and quenching impacts on the three emissions of CdTe-ATPA-Eu3+, which were employed as indicators to perform the ratiometric logical operation and further combined with pattern recognition analysis for multitarget determination. Evidently, such a design exhibits two advances: (1) with the triple-emission probe as the sole receptor requiring neither internal nor external adjustments, the fabricated array acts as an extremely facile tool for multianalyte detection; (2) the ratiometric calculations offer excellent sensitivity and reliability for high-performance determination. Consequently, accurate identification and quantification of individual antibiotics and their combinations at various levels were verified in both laboratory and practical matrices. Our work provides a new tool for simultaneously detecting multiple antibiotics, and it will inspire the development of advanced sensor arrays for multitarget analysis.
研究领域:
分析化学
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环境科学
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生物医学工程
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DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2025
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IF 4.6
Shiwen Wu,Yaxin Li,Shuqi Wang,Hongzhi Lu,Shuzhen Zheng,Shuai Sun,Shoufang Xu
Herein, a method was developed for triple emission ratiometric fluorescence/colorimetric dual-mode detection of glutathione (GSH) based on multifunctional copper-doped carbon dots (Cu-CDs). Cu-CDs displayed dual emission at 465 nm and 650 nm, along with oxidase-like (OXD) and peroxidase-like (POD) activities. The Cu-CDs effectively catalyzed the oxidation of o -phenylenediamine (OPD) to 2,3-diaminophenazine (DAP), which emitted yellow fluorescence at 550 nm and selectively quenched the blue fluorescence of Cu-CDs at 465 nm through an inner filter effect (IFE), while the red fluorescence at 650 nm unaffected. GSH could effectively chelate Cu 2+ in the Cu-CDs, inhibiting DAP formation, led to the recovery of the 465 nm fluorescence, enabling ratiometric fluorescence detection of GSH. The triple-emission system enabled the discrimination of structurally similar substances while improved the sensitivity of the detection. The fluorescence detection demonstrated a limit of detection (LOD) of 1.13 μM for GSH. For colorimetric detection, Cu-CDs catalyzed H 2 O 2 -mediated 3,3′,5,5′-tetramethylbenzidine (TMB) to a blue product (oxTMB) with absorption peak at 652 nm, which further can be reduced by GSH to colorless TMB. Thus, the colorimetric detection of GSH was achieved with LOD of 3.78 μM. The recoveries of the two methods for detecting GSH in fruits and vegetables were found to be 89.67–106.32 % with RSDs as low as 0.6 % (fluorescence) and 1.2 % (colorimetric), respectively.
研究领域:
分析化学
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纳米技术
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生物传感器
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荧光光谱学
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生物分析
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DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
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2019
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IF 6.35
Qian Yang,Jinhua Li,Xiaoyan Wang,Hua Xiong,Lingxin Chen
A novel ternary-emission fluorescence sensor was proposed by post-imprinting mixing blue-/green-/red-emission bovine hemoglobin (BHb) imprinted polymers (b-MIPs, g-MIPs, and r-MIPs) at a proper ratio and realized the multiplexed and visual detection of BHb. The three MIPs were individually embedded with blue-emission 7-hydroxycoumarin, green-emission CdTe quantum dots (QDs), and red-emission CdTe/ZnS QDs. Upon interaction with BHb within 8 min, the fluorescence of CdTe and CdTe/ZnS QDs were simultaneously turned off, whereas the 7-hydroxycoumarin turned on the fluorescence intensity. Thereupon, the ratiometric fluorescence intensity of the ternary emission linearly varied within 0.025–3 μM BHb, accompanying the profuse fluorescence color evolution from yellowish green to yellow to salmon to plum to purple to finally blue. In comparison with the dual- or single-emission sensor, the ternary-emission fluorescence MIPs sensor provided a wider color variation covering the green–red–blue window for accurate naked-eye determination of BHb, as well as a lower detection limit down to 7.8 nM and a higher imprinting factor of 15.2. Moreover, the satisfactory recoveries of 99.25–111.7% in determining the spiked BHb in bovine urine samples, as well as the optical stability and post-imprinting construction convenience, indicated that the developed tricolor-emission fluorescence MIPs sensor provided an ideal alternative for rapid, sensitive, and visual determination of proteins in complicated samples.
研究领域:
分析化学
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生物技术
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材料科学
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生物化学
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DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Lingli Zhu,Dekui Shen,Kai Hong Luo
Considering that hexavalent chromium ions (Cr 6+ ) with high toxicity poses a huge threat to human health and the ecological environment, constructing a rapid and accurate sensing platform is of great significance in detecting the toxic substance. The novel nitrogen and boron co-doped carbon quantum dots (N, B-CQDs) from lignin are synthesized as fluorescent sensors for the detection of Cr 6+ . The synthetic processes involve the acid hydrolysis step followed by the hydrothermal treatment step. Lignin is firstly depolymerized by cleaving ether bonds in the acidolysis , and N, B-CQDs are consequently formed by the aromatic re-fusion of lignin nanoparticles in the hydrothermal process. The lignin-derived N, B-CQDs show triple emission of purple, blue and green fluorescence under the excitation of 300, 330, and 490 nm, respectively. The triple-emission N, B-CQDs are applied for the triple-channel detection of Cr 6+ , which exhibit highly sensitive and selective fluorescence quenching for Cr 6+ with good linearity (R 2 ≤ 0.996) and very low limit of detection as 0.054, 0.049, and 0.077 μM under the excitation of 300, 330 and 490 nm, respectively. The utilization of renewable lignin as CQDs-based fluorescent sensors opens a new avenue for the rapid and accurate detection of Cr 6+ through a multichannel sensing platform.
研究领域:
环境科学
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材料科学
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分析化学
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DOI
PubMed
高影响因子
Nanoscale
·
2020
·Vol. 12
·期 11
·6529-6536
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IF 6.895
Qian Yang,Chuyao Li,Jinhua Li,Xiaoyan Wang,Maryam Arabi,Hailong Peng,Hua Xiong,Lingxin Chen
Multiple emissions of blue, green and red from a molecular imprinting sensor rationally constructed, were used for the fluorescence colorimetric visualization of a fluorescent analyte of folic acid, using a flexible post-imprinting mixing strategy. That is, two kinds of folic acid-templated molecularly imprinted polymers (MIPs) were firstly synthesized by encapsulating green and red fluorescent quantum dots (g-QDs and r-QDs) individually on SiO2 cores, and they were then mixed at an appropriate ratio, resulting in a triple emission MIPs sensor. Upon folic acid recognition, the inherent blue fluorescence of folic acid was intensified, and the green and red fluorescence of the sensor QDs were gradually quenched. The quenching rate difference between g-QDs and r-QDs was greatly enhanced and used to obtain a wider-range and profuse fluorescence color evolution, by investigating the influences of the QDs modifier, eluent and imprinting layer thickness in detail. Under optimal conditions, the ratiometric intensity change of the three color emissions varied in a logistic function within 0.01–50 ppm of folic acid, and the corresponding fluorescence colors shifted from yellow to orange to red to purple and finally to blue. This excellent visualization capability of the MIPs sensor contributed to the accurate naked-eye detection of folic acid concentration using a portable ultraviolet lamp. Moreover, the MIPs sensor succeeded in determining folic acid in complicated food and serum samples, providing comparable results with the PRC standard method and satisfactory recoveries of 99.5–108.0%. The merits, including construction simplicity, high sensitivity and selectivity, and result visualization, enable such a multiple emission MIPs sensing strategy to be potentially applicable for visual identification and determination of various analytes in more fields.
研究领域:
分析化学
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材料科学
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生物传感器
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食品科学
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医学诊断
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产品关联
DOI
PubMed
高影响因子
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