JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2023
·
IF 4.3
Hao Zou,Xiaokun Liao,Xingjian Lu,Xiaoyan Hu,Yue Xiong,Jun Cao,Jiaqi Pan,Chaorong Li,Yingying Zheng
Herein, phenylalanine-bound carbon dots (CDs) with dual fluorescence emission peak behavior were reported, one of which was excitation-dependent and the other was not. The amino and carboxyl groups on the surface of CDs had a certain influence on their fluorescence. When the amino and carboxyl groups on the surface of CDs were removed, their fluorescence was significantly weakened. The prepared CDs had solvent effect, and the emission peak of CDs shifted according to the change of the polarity of the solvent. Based on this, a method was developed for detecting water content in ethanol using CDs as a ratio probe. The change in the ratio of the intensity of the two emission peaks corresponded to the change of water content in ethanol. The detection linearity was good. In addition, the resulting CDs had good biocompatibility and could be enormously transported into cancer cells by the amino acid transporter on the surface of cancer cells, while normal cells only had a small amount of CDs through endocytosis, which laid the base for the distinguishing cancer cells from normal cells. The unique fluorescence properties of the prepared CDs achieved their applications in both water detection and cell differentiation.
研究领域:
分析化学
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Yuqian Liu,Farzad Seidi,Chao Deng,Ruyi Li,Tingting Xu,Huining Xiao
Exploring sensory systems from metal ion receptors enables the continuous development of ion sensing technologies. Herein we report the synthesis of carbon quantum dots (CQDs) from 5,10,15,20-tetrakis(4-sulfophenyl)porphyrin (TSPP) and additional carbon source, and its application in Cu 2+ imaging and quantifying in living cells. The CQDs are synthesized via a hydrothermal method in a successive polymerization and carbonization process. Due to the surface traps introduced by TSPP residue, the CQDs are featured with dual-emissive property of green (505 nm) and red (682 nm) fluorescence. Moreover, the red-to-green fluorescence ratio is readily customizable by tuning the molar fraction of TSPP. Benefited from Cu 2+ complexation induced red fluorescence quenching, the CQDs can be served as the ratiometric fluorescent nanosensor for Cu 2+ detection with ultra-high sensitivity and excellent specificity. The nanosensor is demonstrated to linearly detect Cu 2+ in the range of 0−50 nM, with an extremely low limit of detection (LOD) of 37 pM. More importantly, interference from other biological compositions, especially Fe 3+ , is successfully excluded via the site-selective coordination and specific electron transfer path. Based on the excellent analytical performance of the nanosensor, quantifying Cu 2+ in living cells is realized according to the linear correlation between fluorescence ratio and intracellular Cu 2+ content, which is parallelly detected by inductively coupled plasma mass spectrometry (ICP-MS). To demonstrate its practicality, the nanosensor is challenged to measure Cu 2+ uptake kinetics for cell lines derived from different tissues.
研究领域:
生物传感
·
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2021
·
IF 1.134
Ke-Xin WANG,Chen NIE,Rui-Fang GUAN,Hao ZHANG
In recent years, unconventional fluorescent molecules without conjugated rings have attracted widespread interest due to their excellent fluorescence properties, simple preparation process, good water solubility and excellent biocompatibility. Dual emission fluorescent probes are usually more accurate and sensitive, for eliminating the influence of environmental factors. This work provides a novel strategy to construct double emission fluorescent probes based on unconventional fluorescent molecules and fluorescein isothiocyanate. The aqueous solution of resulting double emission polymer dots ( f-PDs ) shows two fluorescence emission peaks centered at 440 nm and 510 nm under excitation at 363 nm. According to change of these two peaks after adding ions, Cu 2+ and ClO − are judged quantitatively. Cu 2+ or ClO − are also quench fluorescence of f-PDs linearly, as Cu 2+ combines with polyethyleneimine parts of f-PDs to form complexes, while ClO − oxidize hydroxyl groups on the surface of f-PDs . The detection limits of Cu 2+ and ClO − , in an aqueous solution are 6.7 nM and 14.0 nM, respectively.
研究领域:
分析化学
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2021
·
IF 4.889
Gengli Huang,Xueli Luo,Xie He,Yong Han,Haiping Zhao,Wenzhi Tang,Tianli Yue,Zhonghong Li
Herein, carbon dots with intrinsic dual-emission fluorescence (d-CDs) at 360 nm (F 360 ) and 530 nm (F 530 ) under excitation of 320 nm were prepared by microwave-assisted heat treatment of o -phenylenediamine (OPD). Cu 2+ could be effectively captured by the d-CDs via coordinating with the nitrogen lone pair of –NH 2 to form a complex (Cu 2+ -OPD) by electron pair sharing. The complex can efficiently quench the fluorescence of F 360 by through-bond energy transfer (TBET) and meanwhile selectively enhance the fluorescence of F 530 by inhibiting the occurrence of photoinduced electron transfer (PET). The unique opposite response of the d-CDs toward Cu 2+ could produce a large change to the value of F 360 /F 530 and thus the d-CDs were utilized to fabricate a ratiometric fluorescent sensor to detect Cu 2+ with a wide linear range of 0.8–55.0 μmol L −1 and a low limit of detection (LOD) of 44.63 nmol L −1 (R 2 = 0.9989). Recoveries of 95.8–102.3% with relative standard deviations (RSD) < 6.7% were achieved in spiked food samples. Moreover, this sensor possessed excellent selectivity and sensitivity for the quantitative determination of Cu 2+ , indicating its promising potentials for constructing a reliable and convenient approach for quick pre-warning of Cu 2+ .
研究领域:
分析化学
·
材料科学
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2025
·
IF 4.6
Qing Li,Jianghua Wang,Zikang Zhang,Yiluo Xu,Yingqiang Fu
Chlorothalonil (CHT) is a class 2B carcinogen that is capable of remaining in the environment for long periods, has an obvious bioconcentration phenomenon, and may pollute groundwater, thus it is essential to construct a simple detection method for chlorothalonil. However, common single emission fluorescent probes or dual emission fluorescent probes constructed from multi-component mixtures have low selectivity and anti-interference ability. In this work, a simple two-step hydrothermal method was used to synthesize fluorescein-modified carbon quantum dots (F-CQDs), and a dual-emission fluorescent probe was constructed to detect chlorothalonil concentration. The study found that in the presence of a certain amount of Fe 2+ , the fluorescence intensity of the fluorescence emission peaks of F-CQDs located at 435 nm and 508 nm gradually decreased with the increase of CHT concentration within 2 min. This fluorescent probe has specific recognition for CHT and shows a significant linear relationship in the range of 0.1664–3.0695 μM, with a detection limit as low as 8.6 × 10 −3 μM. The probe was successfully applied to the detection of CHT residual content in environmental water with a satisfactory average recovery, and the present study provides a new method for the preparation of dual-emission fluorescent probes and the detection of organic pesticides and shows great potential in environmental monitoring.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Xiaoqiong Wang,Hao Guo,Ning Wu,Mengni Xu,Longwen Zhang,Wu Yang
A novel dual-emission ratio fluorescent sensor (N-CDs/R-CDs@ZIF-8) has been constructed successfully by introducing nitrogen-doped blue fluorescence carbon dots (N-CDs) and red fluorescence carbon dots (R-CDs) into the synthetic environment of ZIF-8 by a simple stirring method. The synthesized material not only inherits the excellent optical properties of N-CDs and R-CDs and the strong adsorption and accumulation performance of ZIF-8, but also shows strong fluorescence and structural stability in extreme environments. The presence of Pb 2+ strongly causes the fluorescence quenching of N-CDs, but has almost no effect on the fluorescence of R-CDs. Therefore, a ratio fluorescence sensor is developed for the determination of Pb 2+ . Most importantly, the real-time fluorescence response shows that the composite material has a high selectivity and good sensitivity to Pb 2+ determination, and the calculated LOD is 4.78 nM(S/N = 3) (0.05–50 μM), indicating that the material can be used as a potential fluorescent sensor for Pb 2+ detection.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 3
·1-9
·
IF 5.833
Li Yanyue,He Yu,Ge Yili,Song Gongwu,Zhou Jiangang
Green emitting copper nanoclusters (G-Cu NCs), yellow emitting Cu NCs (Y-Cu NCs), orange emitting Cu NCs (O-Cu NCs) and red emitting Cu NCs (R-Cu NCs) were prepared using chicken egg white as the stabilizer by changing the reaction conditions. This is a green, facile and cheap method to explore different color emitting CuNCs by the same precursor and stabilizers. The G-Cu NCs were employed for the detection of ethanol due to their aggregation induced emission enhancement (AIEE) effect. The fluorescence emission of Cu NCs at 526 nm under the excitation of 444 nm can be effectively enhanced in the presence of ethanol due to AIEE effect, thus realizing the quantitative determination of ethanol content in the range 5–60%. In addition, a visual dual-emission fluorescence probe with the combination of G-Cu NCs and silicon nanoparticles (Si NPs/G-Cu NCs) was designed to evaluate ethanol content conveniently and rapidly. Desirable linear relationship is observed between ratio of fluorescence intensity (I 525 /I 441 ) and ethanol content under the excitation of 383 nm. Visible color transformation of this probe is observed in the ethanol content range 2–20%. Moreover, the ethanol sensing platforms were applied to the detection and evaluation of the alcohol content of liquor, and the recoveries in liquor were in the range 99.7% to 113%, broadening the applications of Cu NCs and providing a sensitive detection method for ethanol. Graphical abstract
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2022
·Vol. 414
·期 24
·7253-7263
·
IF 4.478
Mei Xiping,Wang Dongxiu,Wang Songbai,Li Junfen,Dong Chuan
In this paper, intrinsic dual-emission fluorescent carbon dots (CDs) doped with N and S atoms have been firstly fabricated. The characterization results show that CDs are successfully synthesized with two separate fluorescence emissions at 468 nm and 628 nm, respectively. The strong and selective interaction of Cr (VI) ions with CDs lead to obvious fluorescence decrease of CDs at 468 nm, which is caused by a mixed quenching mechanism. At the same time, the fluorescence at 628 nm increase. Interestingly, the CDs solution show obvious color change under the daylight and UV light, so visualization detection of Cr (VI) can be realized in water samples. Based on the data of the emission intensity ratios of F 468 / F 628 , Cr (VI) can be detected from 3.8 to 38.9 μM combined with the linear correlation coefficient of 0.998, and the lowest detection concentration is 47.2 nM. The platform is satisfactorily applied to the detection of Cr (VI) ions in water samples. In addition, the CDs could be applied as fluorescent probes for cell imaging with dual fluorescent emission. Graphical abstract
研究领域:
材料科学
·
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 3
·1-12
·
IF 5.833
Yao Chixuan,Liu Qingrun,Zhao Ning,Liu Jing-Min,Fang Guozhen,Wang Shuo
A simple dual-colour fluorescent nanoprobe has been designed composed of blue and yellow emission carbon quantum dots (CQDs). This system is inexpensive and easy to operate and was successfully employed for on-site measurements based on a smartphone app. The designed nanoprobe exhibited increased selectivity for Cr(VI), leading to a double stable response of the two CQDs. The dual-emission nanoprobe showed blue-violet fluorescence upon UV irradiation, and the fluorescent emission peaks were located at 418 nm and 552 nm. The blue light emission of CQDs was quenched with increasing Cr(VI) concentration due to the inner filter effect, whereas the yellow light emission was enhanced due to the aggregation-induced emission effect. The different responses of the dual emissions to Cr(VI) resulted in a fluorescent colour variation, thus enabling facile macroscopic visualization. With a smartphone, the change in the fluorescence colour could be observed more apparently than that of a single fluorescence nanoprobe, and the response increased linearly so that the nanoprobe could be applied to instantaneous measurements. Furthermore, the dual-emission nanoprobe was successfully employed for analysing food and water samples. Accurate concentrations were obtained by constructing a calibration plot using a fluorescence spectrometer and a smartphone app; the recoveries were 81.6% to 107.7%, and the relative standard deviation was below 3.6%. Therefore, this smartphone-integrated dual-emission detection system is promising as a new portable method for the on-site measurement of Cr(VI) ions. Graphical abstract
* Y-CQDs: yellow emission carbon quantum dots. B-CQDs: blue emission carbon quantum dots. B/Y-CQDs: a mixture of B-CQDs and Y-CQDs.
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
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 23
·14551-14556
·
IF 3.269
Li Chen,Lin Sun,Jiahong Zheng,Jiangdong Dai,Yilin Wu,Xiaohui Dai,Chunxiang Li,Yongsheng Yan
In this paper, a highly stable ratiometric fluorescence probe based on dual-emission quantum dots (QDs) was designed for the visual detection of aspirin. The probe was composed of two differently colored CdTe QDs, in which red-emitting QDs embedded in SiO2 (r-QDs@SiO2) acted as the reference signal and green-emitting QDs (g-QDs) covalently anchored on the surface of r-QDs@SiO2 served as the response signal. The fluorescence of r-QDs@SiO2 remained constant, whereas the fluorescence of g-QDs was quenched by the addition of aspirin. As a result, continuous color changes in the dual-emission fluorescence probe were observed. Under optimum conditions, the as-prepared dual-emission fluorescence probe was used for the determination of aspirin in a concentration range of 6.0–45 μmol L−1 with a detection limit of 0.20 μmol L−1. Furthermore, the present method was successfully applied in the detection of aspirin in real samples with a relatively high stability for about ten days.
研究领域:
分析化学
·
医学检测
·
材料科学
✓ 已验证
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Lingxiao Xing,Guihua Li,Yaping Sun,Xu Wang,Zaiwu Yuan,Yingjuan Fu,Menghua Qin
Cellulose nanocrystal (CNC) hybrid materials with numerous optical states have great potential as anti-counterfeiting labels and information encryption materials. However, it is challenging to construct multicolor emitting materials with tunable behaviors, which can dramatically enhance anti-counterfeiting abilities. Here, free-standing composite films with vivid multi-structural colors and dual-emitting fluorescence are successfully fabricated through a host-guest coassembly strategy. The lanthanide complex and an aggregation-induced emission molecule (tetraphenylethylene derivative, TPEC) are selected as luminescent guests, which are integrated into the chiral nematic structure of CNCs. The obtained photonic films display broadband reflection across the visible spectrum, which may be attributed to the chiral nematic domains with variations in the helical pitches and helical axis orientations. Under 254 nm excitation, the film exhibits bright red emission, while blue–green emission switching occurs under 365 nm excitation. The broad reflection band of the film covers both the green and red fluorescent emission centers, and right circularly polarized luminescence emission with different dissymmetry factors is produced due to the selective reflection of the left chiral nematic structure. A large glum value up to −0.21 at 600 nm was realized. Additionally, CNC-based materials with tailored shapes are further used in anti-counterfeit tags and decorative applications.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Rui Cao,Xinxin Li,Zhihang He,Hanxiao Tang,Xiao-Ke Zheng,Zhijuan Zhang
The development of probes for the efficient detection of volatile organic compounds is crucial for both human health protection and environmental monitoring. In this study, we successfully synthesized a ratiometric fluorescent sensing material [Eu-UiO-67 (1:1)], featuring dual-emission fluorescence peaks via a one-pot method. This material demonstrated exceptional ratiometric fluorescence recognition properties for liquid styrene and isoprene, achieving low limit of detections (LODs) of 6.2 and 20.24 ppb, respectively. Furthermore, we leveraged its outstanding photoluminescence properties to fabricate a Eu-UiO-67 film, which exhibited distinctive fluorescence responses toward gaseous styrene and isoprene. This unique behavior resulted in LODs of 12.42 ppb for gaseous styrene and 15.39 ppb for gaseous isoprene. The investigation into the sensing mechanisms revealed that the fluorescence response for styrene was mediated by an internal filtration effect, which arose from the competitive energy absorption between styrene and the Eu-UiO-67 (1:1) material. In contrast, fluorescence resonance energy transfer occurred between isoprene and the Eu-UiO-67 (1:1) materials. This approach offers a sensitive and reliable method for the detection of liquid/gaseous styrene and isoprene.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）