SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2011
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IF 1.77
Shenguang Ge,Juanjuan Lu,Lei Ge,Mei Yan,Jinghua Yu
A novel procedure for the determination of deltmethrin (DM) is reported. The water-soluble CdTe quantum dots (QDs) and highly fluorescent silica molecularly imprinted nanospheres embedded CdTe QDs (CdTe–SiO 2 -MIPs) were prepared and characterized by fluorescence spectroscopy, UV–vis spectroscopy, TEM and IR. The fluorescence nanosensor based CdTe–SiO 2 -MIPs is developed. The possible quenching mechanism is discussed by DM. Under optimal conditions, the relative fluorescence intensity of CdTe–SiO 2 -MIPs decreased with increasing DM by a Stern–Volmer type equation in the concentration range of 0.5–35.0 μg mL −1 , the corresponding detection limit is 0.16 μg mL −1 . The developed sensor based on CdTe–SiO 2 -MIPs was applied to determine DM in fruit and vegetable samples.
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
ANALYTICAL LETTERS
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2015
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IF 1.03
Hongji Li,Xiao Wei,Yeqing Xu,Tongfan Hao,Jiangdong Dai,Jixiang Wang,Lin Gao,Yongsheng Yan
A simple and sensitive method is reported for the synthesis of photoluminescent semiconductor CdTe quantum dots. The CdTe quantum dots were synthesized by using mercaptosuccinic acid for protection in the aqueous phase and used for the determination of aspirin by a quenching reaction. By comparison with thioglycolic acid stabilized CdTe quantum dots, the mercaptosuccinic acid shortened the reaction time. Transmission electron microscopy was used to characterize the CdTe quantum dots; their size was approximately 5.0 nm. The interaction between the CdTe quantum dots and aspirin was characterized by fluorescence and absorption spectroscopy. The optimum pH for measurements was 8.0. Under the optimized conditions, the fluorescence intensity of the CdTe quantum dots had a linear relationship with the concentration of aspirin between 1.7 and 56 µmol/L and the quenching reaction was shown to have a static mechanism. As the concentration of aspirin increased, the fluorescence quenching of mercaptosuccinic acid stabilized CdTe quantum dots increased. This method was successfully used for the determination of aspirin in tablets.
研究领域:
分析化学
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纳米技术
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药物分析
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DOI
高影响因子
TALANTA
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2016
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IF 4.035
Chunli Jiang,Zhitao Shen,Chunhua Luo,Hechun Lin,Rong Huang,Yiting Wang,Hui Peng
A facile one-pot strategy has been developed for the aqueous synthesis of Gd doped CdTe (Gd:CdTe) QDs as fluorescence and magnetic resonance imaging dual-modal agent. The prepared Gd:CdTe QDs showed narrow size distribution and the average size was less than 5 nm. The amount of Gd 3+ dopant in Gd:CdTe QDs significantly affected the optical properties of obtained QDs. The highest PL QY for the prepared Gd:CdTe QDs was up to 42.5%. The QDs showed the weak toxicity and significant enhancement in MRI signal. The specific relaxivity value ( r1 ) was determined to be 4.22 mM −1 s −1 . These properties make the prepared Gd:CdTe QDs be an effective dual-modal imaging agent and have great potential applications in biomedical field.
研究领域:
材料科学
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医学影像
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纳米生物学
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DOI
PubMed
高影响因子
Food Science and Human Wellness
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2017
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IF 0
Chi-Fang Peng,Ying-Ying Zhang,Zhi-Juan Qian,Zheng-Jun Xie
In this work, glutathione capped CdTe QDs (GSH-QDs) were prepared through a one-pot process and found to be quenched by Cr 3+ , Ag + and Cu 2+ ions. Cr 3+ and chromium (III) picolinate could be quantitatively measured after masking Cu 2+ and Ag + ions by sulfide. Under optimal conditions, linear quenching was observed for Cr 3+ in the ranges of 0–2.0 μM and the limit of detection was 3.0 nM. The recoveries for Cr 3+ in vitamin supplements obtained were from 92.5% to 106%. The determination results of chromium (III) picolinate in vitamin supplement samples were compared to that obtained using flame atomic absorption spectrometry (FAAS) method, and the result showed good reliability.
研究领域:
分析化学
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环境科学
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生物医学
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DOI
AICHE JOURNAL
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2015
·Vol. 62
·期 2
·580-588
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IF 2.748
Zhixing Zhao,Xiao-Qiao Wang,Luting Ling,Cai-Feng Wang,Su Chen
The bottleneck of large-scale production of semiconductor quantum dots (QDs) is how to solve heavy metal ions waste water and the rapid separation during industrial process. A facile strategy for fabricating CdTe@Ca(OH) 2 nanocrystals exhibiting both improved photoluminescence (PL) stability and prolonged PL lifetime via an economical coprecipitating technology is reported herein. The procedure on capping CdTe QDs into Ca(OH) 2 crystals can enable the products to be easily filtrating separation and the content of residual Cd 2+ filtrate solution to be reached to 0.238 ppm level. Also, fluorescent rod-like heterocrystals by addition of saturated CaCl 2 solution is constructed. CdTe@Ca(OH) 2 nanocrystals is utilized further as phosphor powders to construct white light emitting diode (WLED). The WLED presented, here, has good photoelectric properties with color rendering index of 82.4 at 350 mA, a color temperature of 4643 k, and Commission Internationale de L'Eclairage coordinate of (0.3548, 0.3532), belonging to the white gamut, showing great potential in industrial application. © 2015 American Institute of Chemical Engineers AIChE J , 62: 580–588, 2016
研究领域:
材料科学
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化学工程
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光学工程
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高影响因子
ANALYTICAL CHEMISTRY
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2019
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IF 6.35
Qinlei Liu,Yao Lin,Jing Xiong,Li Wu,Xiandeng Hou,Kailai Xu,Chengbin Zheng
A disposable, instrument-free, height readout paper-based analytical device (HR-PAD) based on a paper strip inkjet-printed with CdTe quantum dots (QDs) was developed for the sensitive speciation analysis of Ag+ and silver nanoparticles (AgNPs). When the paper strip is immersed into a sample solution, capillary action draws it through the surface and any Ag+ in the solution quenches the fluorescence of CdTe QDs via a cation exchange reaction between Ag+ and the CdTe QDs, with the height of the quenched band being proportional to the concentration of Ag+. In contrast, fluorescence quenching cannot be observed when only AgNPs are present in solution. Thus, the concentration of AgNPs can be obtained by subtracting the Ag+ content from the total silver determined by the HR-PAD after digestion with HNO3. Under optimized conditions, the methodology provides high selectivity, sensitivity, and accuracy for the detection of Ag+ or AgNPs in various samples, even at concentrations as low as 0.05 mg L–1. Precisions of 4.5% and 2.2% RSDs were achieved at concentrations of 1 mg L–1 and 7 mg L–1 of Ag+, respectively. Compared to conventional methods, this approach is inexpensive and user-friendly and eliminates the need for expensive and sophisticated detection instruments. The practicality of the method was demonstrated via the speciation analysis of AgNPs and Ag+ in river water and 12 commercial products with satisfactory results.
研究领域:
分析化学
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环境科学
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纳米技术
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PubMed
高影响因子
JOURNAL OF FLUORESCENCE
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2025
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IF 3.1
Ye Ziqing,Xu Kedian,Gao Yunling
A rapid and sensitive ratiometric fluorescence nanosensor for the detection of norfloxacin was obtained, where the yellow-emitting CdTe quantum dots (QDs) were as an internal reference and aluminium ion (Al³⁺) chelated on the QDs surface as the sensing unit. The nanosensor was characterized by transmission electron microscopy, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. As the concentration of norfloxacin increased, the sensor exhibited a continuous fluorescence color transition from yellow to blue. The CdTe-Al³⁺ QDs sensor demonstrated a low limit of detection of 6.6 nM. The ratiometric fluorescence sensor was also integrated with a smartphone color recognizer for visual and quantitative detection of norfloxacin with a limit of detection of 1.57 µM. This sensing platform exhibits excellent sensitivity, selectivity, and anti-interference performance, and it has great potential for on-site and quantitative 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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高影响因子
Journal of Analytical Methods in Chemistry
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2025
·Vol. 2025
·期 1
·9981628
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IF 2.2
Linlin Yin,Yuyu Du,Miaohua Ge,Xiang Zhang,Xinyi Du,Xiaoqiong Wu
Dopamine (DA) is a catecholamine neurotransmitter secreted by the human adrenal medulla and is related to many medical diseases. The rapid and sensitive detection of DA levels in physiological media is attracting attention. This paper has developed a fluorescence paper-based sensor using CdTe quantum dots (QDs)-rod nanozinc 5, 10, 15, 20-tetra (4-pyridyl)−21H-23H-porphine (nanoZnTPyP) for sensitive and visual detection of DA. After adding DA, the original quenching fluorescence of the CdTe QDs-rod nanoZnTPyP sensor was effectively restored. The detection mechanism may be that the oxidation of DA to the alkaline CdTe QDs-rod nanoZnTPyP solution produced DA-quinine, and the recovery of fluorescence was caused by the electronic effect of DA-quinine and rod-shaped nanoZnTPyP. The detection range is 0.5∼10 nmol/L, and the limit of detection (LOD) is 0.38 nmol/L (S/N = 3). The sensor system was used on paper device to detect significant changes in the fluorescent color of DA at different concentrations. In addition, this method has been successfully used for the determination of DA in human plasma. The sensor system is simple, easy to operate, and has high selectivity for possible DA interfering substances, which provided new ideas for detecting DA and Parkinson’s disease, Alzheimer’s disease, and other DA-related diseases.
研究领域:
生物化学
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医学检测
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材料科学
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PubMed
高影响因子
JOURNAL OF INORGANIC BIOCHEMISTRY
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2012
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IF 3.354
Jinzhi Xia,Ying Yu,Qiumei Liao,Yujuan Cao,Bixia Lin,Xiaogang Hu,Jianzhong Wu
A novel Ca 2 + -sensitive fluorescent probe was synthesized and characterized with a coupled method that coupled di[2-(N,N-dicarboxylmethyl)amino]ethyl ether (EGTA) to the surface of mercaptoethylamine-modified CdTe quantum dots (CdTe/MA-EGTA QDs). The application of this probe to detect intercellular Ca 2 + change in the leaf cells of Arabidopsis thaliana was studied. Results from transmission electron micrographs showed that the particle size of CdTe/MA-EGTA was about 3–4 nm; the fluorescent spectrum indicated that the excitation spectral ranged from 350 to 490 nm with a narrow and symmetric emission spectral peak at 565 nm when excited by 400 nm, and capillary electrophoresis demonstrated that CdTe/MA-EGTA was obtained by a coupling reaction. When the detected conditions were set as an excitation wavelength of 514 nm and detection wavelength of 561–604 nm, the increase of Ca 2 + in A. thaliana leaf cells and the rapidly quenching effect of fluorescence signal induced by exogenous treatment of jasmonate acid (JA) could be measured using laser scanning confocal microscopy . The quenching rate of traditional Ca 2 + -sensitive fluorescent probe Fluo-3 reached about 80% within a minute when exciting at 488 nm, which was much faster than the novel fluorescent probe CdTe/MA-EGTA. CdTe/MA-EGTA, however, was better at resisting photo bleaching and was more suitable for long-term tracking and monitoring than Fluo-3.
研究领域:
植物学
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分子生物学
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DOI
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
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2021
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IF 1.134
Xia-Chu-Qin LI,Tong YANG,Jian WANG,Cheng-Zhi HUANG
In this work, electrospun nanofibers (NFs) with good moisture-resistance were prepared by electrospinning technology, and further assembled with CdTe quantum dots (CdTe QDs). The results of scanning electron microscopy, transmission electron microscopy and confocal fluorescence microscopy showed that the CdTe QDs with strong fluorescence were uniformly assembled on the surface of electrospun NFs after the electrostatic adsorption for 90 min at pH 7.2. Under 365 nm excitation, the CdTe QDs-NFs assembly presented red fluorescence, which could be significantly quenched by copper ion (Cu 2+ ), and the fluorescence quenching degree of CdTe QDs-NFs assembly showed a good linear relationship with Cu 2+ concentration in the range of 0.08–800 μmol/L, and the detection limit was 11.1 nmol/L. This method had advantages of simplicity and high selectivity, and was successfully applied to the visualization and portable detection of Cu 2+ in environmental water samples.
研究领域:
材料科学
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环境科学
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分析化学
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PHOTOCHEMISTRY AND PHOTOBIOLOGY
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2020
·Vol. 96
·期 5
·1154-1160
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IF 2.721
Kaili He,Xin Zhan,Lian Liu,Xiaohong Ruan,Yiwei Wu
A simple and effective ratiometric fluorescence sensor of CdTe QDs/GCNNs for on-site and rapid analysis of Cu 2+ has been established by mixing physically CdTe QDs and graphite carbon nitride (GCNNs). Two emissions peaks of CdTe QDs at 572 nm and GCNNs at 436 nm are both excitated at 340 nm. Under a UV lamp, fluorescent of traffic yellow CdTe QDs is linearly quenched by Cu 2+ (as the detection signal), while blue GCNNs remains unchanged (as the reference), resulting in a distinguishable color change gradually from pink yellow to blue. The limit of detection (LOD) of this new sensor for Cu 2+ is as low as 0.47 ng mL −1 with 1.4 % RSD. The established method has been successfully applied to detection of Cu 2+ in various drinks with satisfactory results. Moreover, a paper-based sensor, which has been prepared by soaking cellulose acetate membrane in CdTe QDs/GCNNs sensor solution, has a wide semiquantitative detection range for Cu 2+ (0.01 ~ 5.0 μg mL −1 ). It has realized successfully on-site and rapid determination of Cu 2+ in red wine without any pretreatment procedure and is of great promotion and application value in determination of Cu 2+ in liquid samples.
研究领域:
分析化学
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环境科学
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食品科学
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PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2017
·
IF 2.536
Yuan Guo,Xiaoqing Zeng,Haiyan Yuan,Yunmei Huang,Yanmei Zhao,Huan Wu,Jidong Yang
In this study, a novel method for chiral recognition of phenylglycinol (PG) enantiomers was proposed. Firstly, water-soluble N -acetyl- l -cysteine (NALC)-capped CdTe quantum dots (QDs) were synthesized and experiment showed that the fluorescence intensity of the reaction system slightly enhancement when added PG enantiomers to NALC-capped CdTe quantum dots (QDs), but the R-PG and S-PG could not be distinguished. Secondly, when there was Ag + presence in the reaction system, the experiment result was extremely interesting, the PG enantiomers cloud make NALC-capped CdTe QDs produce different fluorescence signal, in which the fluorescence of S-PG + Ag + + NALC-CdTe system was significantly enhanced, and the fluorescence of R-PG + Ag + + NALC-CdTe system was markedly decreased. Thirdly, all the enhanced and decreased of the fluorescence intensity were directly proportional to the concentration of R-PG and S-PG in the linearly range 10 − 5 –10 − 7 mol·L − 1 , respectively. So, the new method for simultaneous determination of the PG enantiomers was built too. The experiment result of the method was satisfactory with the detection limit of PG can reached 10 − 7 mol·L − 1 and the related coefficient of S-PG and R-PG are 0.995 and 0.980, respectively. The method was highly sensitive, selective and had wider detection range compared with other methods.
研究领域:
分析化学
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生物化学
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DOI
PubMed
高影响因子
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