JOURNAL OF FLUORESCENCE
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2015
·Vol. 25
·期 4
·897-905
·
IF 1.927
Li Li,Zhang Qiaolin,Ding Yaping,Lu Yaxiang,Cai Xiaoyong,Yu Lurong
Based on the quenching of the fluorescence intensity of thioglycolic acid (TGA)-capped core-shell CdTe/ZnS nanoparticles (NPs) by vanillin, a novel, simple and rapid method for the determination of vanillin was proposed. In aqueous medium, the functionalized core-shell CdTe/ZnS NPs were successfully synthesized with TGA as the capping ligand. TGA-capped core-shell CdTe/ZnS NPs were characterized by using X-ray diffraction (XRD), transmission electron microscopy (TEM) and Fourier transform infrared (FTIR) spectroscopy. Factors affecting the vanillin detection were investigated, and the optimum conditions were also determined. Under the optimum conditions, the relative fluorescence intensity of CdTe/ZnS NPs was linearly proportional to vanillin over a concentration range from 9.4 × 10 −7 to 5.2 × 10 −4 M with a correlation coefficient of 0.998 and a detection limit of 2.6 × 10 −7 M. The proposed method was also employed to detect trace vanillin in cookies with satisfactory results.
研究领域:
分析化学
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纳米技术
·
食品科学
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DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Yuting Wang,Jia Liu,Bin Yang,Fengming Zhang,Xin Liu,Shiyue Niu,Shuyun Bi
Based on the fluorescence sensor of 3-Mercaptopropionic acid (MPA) capped CdTe quantum dots (QDs), two novel detection methods for aklomide and nitromide were developed. The MPA-CdTe QDs were synthesized and characterized by transmission electron microscopy (TEM), thermogravimetric analysis (TGA), X-ray diffraction (XRD), ultraviolet visible (UV–vis) and fluorescence (FL). The quenchings were all static. The binding constants ( K a ) at different temperatures were obtained. Electrostatic forces were the main forces for the two bindings. For the detection of aklomide and nitromide, under the optimal conditions, the effects of some metal ions, glucose, bovine serum albumin (BSA) and congeneric drug on the determination were explored. The standard equations were established and the limits of detection (LOD) were 0.0215 and 0.0388 μg mL −1 (3 S 0 / S ), repectively. The methods were applied to analyse the samples of chicken and duck, the recoveries were 99.41 % – 101.24 % with RSDs of 0.29 % – 1.19 % ( n = 5).
研究领域:
分析化学
·
食品科学
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产品关联
DOI
PubMed
高影响因子
Journal of Analysis and Testing
·
2017
·Vol. 1
·期 4
·291-297
·
IF 0
Majeed Saadat,Gao Wenyue,Lai Jianping,Wang Chao,Li Jianping,Liu Zhongyuan,Xu Guobao
Abstract Most luminescent glucose sensors based on the interaction of glucose with organic boric acids or borates. Herein, a new luminescent glucose sensor is designed using thioglycolic acid-capped CdTe quantum dots in the presence of cheap inorganic boric acid. Both peak position and intensities change upon the addition of glucose because of the interaction of boric acid with glucose and thioglycolic acid-capped CdTe quantum dots, which enables glucose detection by either color change or intensity change. The luminescent intensities change linearly with glucose concentrations in the ranges from 0.03 to 1 mM and 1–25 mM with a detection limit of 10 µM ( S / N = 3). Moreover, glucose concentrations can be conveniently detected by color change in the range from 1 mM–25 mM. It displays a highly selective response to glucose over other interfering but biologically important saccharides, amino acids, and common ions. Graphical Abstract A thioglycolic acid-capped CdTe QD-based sensor can detect glucose with wide linear range by change in intensity or color in the presence of cheap inorganic boric acid.
研究领域:
生物化学
·
分析化学
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产品关联
DOI
Food Science and Human Wellness
·
2017
·
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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产品关联
DOI
OPTICS AND SPECTROSCOPY
·
2013
·Vol. 115
·期 4
·596-600
·
IF 0.559
Wang Rui-yong,Wu Jing,Wang Lv-jing,Wang Rui,Dou Huan-jing
A novel CdTe quantum dots (QDs) based technology platform was established in aqueous solution. It can perform accurate and simple determination of aminophylline concentration in pharmaceutical samples with satisfactory results. Under optimum conditions, the relative fluorescence intensity of CdTe quantum dots is linearly proportional aminophylline concentration from 2.00 to 80.0 μg mL −1 with a correlation coefficient of 0.9979 for aminophylline determination and a detection limit of 0.531 μg mL −1 .
研究领域:
分析化学
·
药剂学
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纳米医学
·
药物分析
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生物传感
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DOI
高影响因子
JOURNAL OF FLUORESCENCE
·
2023
·Vol. 33
·期 5
·2075-2084
·
IF 2.7
Chen Ting,Ge Zicheng,Fang Min,Zhu Weiju,Li Cun
In this paper, a novel amino acid surface-functionalized semiconductor CdTe quantum dot fluorescent probe amidated by carboxyl and amide groups was synthesized to detect pyrophosphate ions (P 2 O 7 4− , PPi). L-Arginine (L-Arg) was grafted onto cysteine modified CdTe quantum dots (Mea-CdTe QDs) to form a new L-Arginine-functionalized quantum dot fluorescent probe (L-Arg@Mea-CdTe). The prepared probe has good optical properties with multiple grafted functional groups on the surface. The guanidine group of the L-Arg@Mea-CdTe fluorescent probe is strongly basic and will be fully protonated under physiological conditions. The resulting hydrogen bonds bound to pyrophosphate lead to significant changes in the fluorescence of CdTe quantum dots. IR and XPS characterization were performed to confirm it. The addition of PPi induces a significant fluorescence quenching of L-Arg@Mea-CdTe in aqueous solution. The fluorescent QDs probe can also detect pyrophosphate with good sensitivity and anti-interference performance. The detection limit of the L-Arg@Mea-CdTe fluorescence probe for PPi is as low as 0.30 μM. In addition, the novel nano-fluorescent probe was successfully applied to detect PPi in water and in cell imaging.
研究领域:
分析化学
·
纳米技术
·
生物成像
·
材料科学
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DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2016
·Vol. 16
·期 12
·12172-12178
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IF 1.338
Guo Yajin,Liu Zheng,Han Guo-Cheng,Li Wei,Hu Yajun,Chen Zhencheng
CdTe quantum dots (QDs) modified with 4-aminoantipyrine shrink 2,5-dihydroxylbenzadehyde Schiff base were synthesized and characterized using infrared spectrum (FTIR), ultraviolet-visible spectrum (UV-vis), photoluminescence (PL), TEM and thermal gravimetric analysis (TGA). The as-prepared
fluorescent switch was subjected to the determination of Pb2+ by the fluorescence resonance energy transfer (FRET). There were two successive linear relationships between the fluorescent intensity and Pb2+ concentration, in the concentration range of 0.01–100 μmol/L
and 100–10000 μmol/L with r = 0.9994 and r = 0.9996, respectively, and accompanying with 3.0 nmol/L limit of detection. The proposed method was successfully applied to detect Pb2+ in industrial sewage samples and the results showed that the relative
standard deviation was less than 4.1%, with a recovery of 96.7–102%.
研究领域:
分析化学
·
环境科学
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DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2012
·
IF 2.098
Lun Wang,Fei Yuan,Hong-Qi Chen,Bo Ling,Juan Xu
A novel flow injection nanocrystals (NCs) chemiluminescence (CL) analysis method has been established for the determination of estradiol, estriol and estrone based on the enhancement of CdTe NCs–KMnO 4 CL reaction catalyzed by sodium hexametaphosphate. Glutathione (GSH)-capped CdTe nanocrystals were synthesized in aqueous medium, and the CdTe NCs emitted at around 555 nm was selected as the light emitter in CdTe NCs–KMnO 4 chemiluminescence (CL) system. It has been found that sodium hexametaphosphate (SHMP) enhanced the CL of the CdTe NCs–KMnO 4 system and estrogens increased these CL signals again in near neutral solution. UV–visible spectra, photoluminescence (PL) spectra, transmission electron microscopy (TEM) and CL spectra were used to characterize CdTe nanoparticles and investigate the mechanism of the CL reaction. On the basis of the enhancement, a novel flow-injection CL method has been established for the determination of estrogens. Under the optimum experimental conditions, three linear relationships were obtained. The method described is simple, sensitive, and has been successfully utilized for the determination of estrogens in tap water samples.
研究领域:
分析化学
·
环境科学
·
生物医学
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DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Yihua Wei,Weihong Li,Yan Han,Yan Xiong,Yuanying Kuang,Jinyan Zhang
Zilpaterol hydrochloride (zilpaterol) is used in animal feed as it can increase the lean meat mass. However, consuming zilpaterol-containing animal products may damage human health. Therefore, rapid detection of zilpaterol is attracting increasing research attention. This study aimed to developed a fast, accurate, and ultrasensitive fluorescence immunoassay based on CdTe quantum dots (QDs). A CdTe QD fluorescence sensor was synthesized from thioglycolic acid using a simple hydrothermal method. The morphology and structure of the CdTe QDs were characterized using transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and Fourier-transform infrared spectroscopy. The detection limits of our method in swine urine and pork samples were 0.5 μg/L and 1.2 μg/kg, respectively. A wide linear range of 0.1–10000 μg/L (R 2 = 0.996) was achieved. Both within-run precision (CVw) and between-run precision (CV b ) were ≤ 10 %. The method was then successfully applied for the analysis of zilpaterol contents in swine urine and pork samples.
研究领域:
分析化学
·
食品安全
·
生物医学
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产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2017
·Vol. 9
·期 6
·929-936
·
IF 1.9
Fan Zhang,Miaomiao Chen,Haiqing Zhang,Huayu Xiong,Wei Wen,Xiuhua Zhang,Shengfu Wang
A sensitive, convenient and rapid fluorescent sensor for effectively and directly detecting propranolol was proposed based on the fluorescence suppression of 3-mercaptopropionic acid stabilized CdTe quantum dots. The fluorescence suppression mechanism between CdTe QDs and propranolol was studied by time-resolved fluorescence spectroscopy, UV-Vis spectroscopy and fluorescence spectroscopy, and it was attributed to the simultaneous action of the inner filter effect (IFE) and dynamic quenching effect (DQE). The effects of the concentration of quantum dots, pH value of buffer solution and incubation time on the fluorescence signal of the propranolol/CdTe quantum dot system were also investigated. The results indicated that, when the experiment was conducted under optimal experimental conditions, the linear range of this assay was 0.1 μM to 2 μM and 5 μM to 200 μM, with a corresponding detection limit of 0.055 μM. Moreover, some common drug excipients and analogues of propranolol and stimulants had no apparent effect on the determination of propranolol. The proposed fluorescent sensor could be readily used for effectively and directly detecting propranolol in biological samples.
研究领域:
分析化学
·
生物医学
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2019
·
IF 2.12
Xuanping Tan,Qin Li,Jidong Yang
A simple and sensitive method for detecting LFO was developed based on electron transfer mechanism quenched the fluorescence of GSH-CdTe QDs. LFO, as an effective electron acceptor , is added into the QDs solution for electron transfer, the transfer of electrons from the conduction band of QDs to LFO prevents the recombination of free electrons and valence band holes of QDs, thus causing the fluorescence quenching of QDs. Under the optimal experimental conditions, the fluorescence quenching degree of QDs has a good linear relationship with the concentration of LFO within the range of 0.73–7.30 μg mL −1 , the correlation coefficient is 0.9978, and the detection limit is 1.53 ng mL −1 . In addition, the reaction mechanism and experimental conditions were investigated, and the method was successfully applied to the detection of LFO in milk and serum samples.
研究领域:
分析化学
·
食品安全
·
生物医学
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产品关联
DOI
高影响因子
Nano Energy
·
2018
·
IF 13.12
Jia-Wen Xiao,Sai Ma,Shijie Yu,Chenxiao Zhou,Pengfei Liu,Yihua Chen,Huanping Zhou,Yujing Li,Qi Chen
Solar cells employing lead halide perovskites as light absorbers have been one hot topic in recent years due to their amazing device performance and commercialization potential. Yet, there exist challenges on the way to their practical use, including long-term stability, and J-V hysteresis . Herein, we demonstrate an improved contact between perovskite and hole transporting layer (HTL) by using CdTe quantum dots , wherein the capping ligands on quantum dots are systematically investigated. The devices with the CdTe quantum-dot-in-perovskite solids interlayer achieve a high efficiency (~ 19.3%, averaged), and more importantly, a significantly reduced hysteresis, which is superior to devices with CdTe QDs capped by other ligands (PbI 2 , CH 3 NH 3 I, oleic acid). We attribute this superior device performance to the congeneric junction contact between perovskite and CdTe quantum-dot-in-perovskite layer. Furthermore, we reveal that the reduced hysteresis is partially contributed from faster hole extraction at the interface thanks to the high hole mobility in CdTe. These findings shed lights on the future design of quantum dots for perovskite optoelectronics in the perspective of ligand engineering.
研究领域:
材料科学
·
光电子学
·
能源科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）