Current Analytical Chemistry
·
2019
·Vol. 15
·期 5
·560-566
·
IF 1.242
Zhang Zhixia,Zhao Dan,Pang Yonghao,Hao Jian,Xiao Xincai,Hu Yan
Background: Formaldehyde is widely acknowledged as a carcinogen, but as an important organic reagent, it has also been widely employed in the fields of chemical synthesis, industrial production and biomedicine. It is therefore of great practical significance for the detection of formaldehyde
in food, clothing, daily necessities, construction materials and environments. Methods: The two silicon QDs, that are, DAMO-Si-QDs (with N-[3-(Trimethoxysilyl) propyl] ethylenediamine as silicon source) and APTMS-Si-QDs (with (3-Aminopropyl) trimethoxysilane as silicon source) as the
fluorescence probe to detect formaldehyde in both water and organic phases. Results: Silicon QDs prepared by different silicon sources exhibit an obvious difference in their tolerances to the environment and the responses to formaldehyde. However, APTMS-Si-QDs show better selectivity
in both water and organic phases. In Tris-HCl solution (20.00mmol•L-1, pH=5), the formaldehyde concentration maintains an excellent linear relationship with the fluorescence intensity of APTMS-Si-QDs in the range of 3.1250-7-3.1250-5 mol•L-1, with correlation coefficient R2= 0.9998.
In methanol, the formaldehyde concentration maintains an excellent linear relationship with the fluorescence intensity of APTMS-Si-QDs in the range of 1.5630-7-3.1250-5 mol•L-1, with correlation coefficient R2= 0.9992. Conclusion: It is found that DAMO-Si-QDs show poor response to
the presence of formaldehyde, while APTMS-Si-QDs got a strong, sensitive and selective response to that in both aqueous and organic phases. In the Tris-HCl buffer (20 mmol•L-1, pH=5), the linear range for formaldehyde detection reaches 3.1250-7-3.1250-5 mol•L-1, and for the detection
in the organic phase, the linear range reaches 1.5630-7-3.1250-5 mol•L-1, in methanol solution. The paper provides a sensitive, selective and simple means for formaldehyde detection in both aqueous and organic phase.
研究领域:
分析化学
·
环境科学
·
生物医学
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE FORUM
·
2018
·
IF 0
Hui Meng Wang,Ming Zhou Su,Chang Chen
Steel foams have been receiving a growing interest due to the unique structural properties. The space holder technique provides a high degree of freedom and allows to produce this kind of materials varying in a wide range of porosity. However, the accurate prediction of final porosities has been a difficult problem in this technique. Therefore, a nonlinear equation between spacer content (φ1) and porosity (P) of the sintered steel foams was established in this study when macropores, micropores and their volumetric change were taken into account at the same time, that was P = (aφ1+b)/(cφ1+d). Then, validation of the theoretical relationship was carried out using the experimental data by authors and other researchers. The results showed that the porosity could be well predicted by the nonlinear relationship with varied preparing parameters. One set of coefficients in the model equation, i.e., a, b, c, d, corresponds to a certain preparing condition, while these values changed in different preparing conditions.
研究领域:
材料科学
·
工程学
✓ 已验证
DOI
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 30
·1-10
·
IF 2.8
Ren Ying,Zhou Heng,Huang Wentao,Li Hongyu,Li Zhengxin
Rapid industrialization has brought about Cr 6+ pollution, and the excellent performance of carbon dots (CDs) provides a new idea for preparing environmentally friendly nanoprobes for Cr 6+ detection. In the present work, five spherical fluorescent CDs with an average diameter of 4 nm based on citric acid, citric acid and p-phenylenediamine, citric acid and octylamine, gelatin, and glutamic acid were synthesized by a one-step hydrothermal process. Fourier transform infrared (FTIR) spectroscopy, ultraviolet–visible (UV–Vis) absorption spectra and steady-state fluorescence spectroscopy were used to detect the fluorescence properties of CDs. A fluorescent “on–off” sensor was used to investigate the effects on Cr 6+ by using the fluorescence burst mechanism of CDs. The results indicate that Cr 6+ had a fluorescence burst effect assigned to CDs its chelation with the Cr(VI) on all the four CDs containing elemental nitrogen which facilitating charge transfer from the excited state of the CDs to Cr(VI). Among the other four CDs used for Cr(VI) detection, the gelatin-based CDs had a wide detection range and good linearity ( R 2 = 0.9873) for Cr(VI). There is a linear relationship between the degree of fluorescence burst and the Cr 6+ concentration, which provides a reference for the use of CDs in metal ion detection.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Xu Zhu,Shufang Wu,Chunlan Li,Maotian Xu,Baoxian Ye
DNA was employed in a novel way to contribute to the electroanalysis. Electrochemical oxidized DNA modified glassy carbon electrode (DNA/GCE) by potentiostatic method for Levotetrahydropalmatine (L-THP) determination was prepared. For the first time, L-THP was investigated by electrochemical sensor, and the results indicated that this voltammetric sensor exhibited a special recognition capacity towards L-THP determination. Under the optimize condition, the response peak currents had a linear relationship with the L-THP concentrations in range from 5.6×10 -5 mol L -1 to 2.8×10 -3 molL -1 with detection limit of 2.×10 -6 moi . L -1 .
研究领域:
分析化学
·
生物化学
✓ 已验证
产品关联
DOI
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
REACTIVE & FUNCTIONAL POLYMERS
·
2025
·
IF 5.1
Xiujuan Gao,Yichuan Zhang,Mingming Guo
Fluorescent probes generally consisting of a fluorophore and a recognition part can detect and label various substances through the changes of fluorescence properties before and after recognition. In this work, we synthesized a new monomer using the heck coupling reaction, and the polymeric fluorescent probes were prepared via free radical polymerization with two structurally similar monomers. The effects of molecular structures on the luminescent properties (intensity and lifetime) were explored systematically. Ten metal ions were screened at their optimal excitation wavelengths to figure out their corresponding specific recognition ions through the change of fluorescence color and fluorescence signals, and it was found that the fluorescence probes and the ions showed a good linear relationship within a detective concentration range and could also be calculated by the limit of detection formula to reach a lower detect limit (LOD, 0.0027 μM) than before (0.12 μM). Then the potential biological application of the polymers was investigated, and it suggested that fluorescent probes have potential application in sensor devices and bioimaging.
研究领域:
化学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 51
·32203-32209
·
IF 3.361
Zhencai Xu,Aibo Song,Fangwu Wang,Hongwei Chen
CO, a gas molecule that is harmful to living organisms, has a high affinity with hemoglobin, which will cause severe hypoxia. However, in recent years, researchers have discovered that endogenous CO, similar to NO, is one of the messenger molecules, which has a certain regulatory effect in many physiological and pathological processes in the respiratory system, cardiovascular system, and nervous system. Therefore, it is urgent to explore an effective method to monitor the role of CO under physiological and pathological conditions. Herein, we designed and synthesized a near-infrared small-molecule fluorescent probe for the detection of CO in living cells. In this design, a two-site BODIPY dye was introduced as the fluorophore, and the allyl chloroformate part as the CO reactive group. The probe displays excellent sensitivity, selectivity, and a good linear relationship to CO. Furthermore, it shows good biocompatibility and low cytotoxicity. This probe has been successfully applied to the detection of CO in a variety of cells. The developed fluorescent probe can serve as a potential molecular imaging tool for in vivo imaging and detection of CO.
研究领域:
生物化学
·
医学影像
·
分子生物学
✓ 已验证
DOI
PubMed
高影响因子
Frontiers in Chemistry
·
2020
·
IF 3.693
Chen Mei-jun,Yang Hai-lin,Si Ya-min,Tang Qian,Chow Cheuk-fai,Gong Cheng-bin
As a moderately toxic organophosphorus pesticide, profenofos (PFF) is widely used in agricultural practice, resulting in the accumulation of a high amount of PFF in agricultural products and the environment. This will inevitably damage our health. Therefore, it is important to establish a convenient and sensitive method for the detection of PFF. This paper reports a photoresponsive surface-imprinted polymer based on poly(styrene-co-methyl acrylic acid) (PS-co-PMAA@PSMIPs) for the detection of PFF by using carboxyl-capped polystyrene microspheres (PS-co-PMAA), PFF, 4-((4-(methacryloyloxy)phenyl)diazenyl) benzoic acid, and triethanolamine trimethacrylate as the substrate, template, functional monomer, and cross-linker, respectively. PS-co-PMAA@PSMIP shows good photoresponsive properties in DMSO/H2O (3:1, v/v). Its photoisomerization rate constant exhibits a good linear relationship with PFF concentration in the range of 0~15 μmol/L. PS-co-PMAA@PSMIP was applied for the determination of PFF in spiked tomato and mangosteen with good recoveries ranging in 94.4–102.4%.
研究领域:
分析化学
·
环境科学
·
农药残留检测
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2013
·Vol. 18
·期 3
·621-628
·
IF 2.279
Ma Xinying,Chao Mingyong
A novel poly(methylene blue)/graphene composite glassy carbon electrode was fabricated and the electrochemical behavior of maltol at the modified electrode was studied by cyclic voltammetry. In phosphate-buffered solution, the modified electrode exhibited excellent electrocatalytic activity towards the electrochemical oxidation of maltol. Under optimized conditions, the oxidation peak current showed a linear relationship with the concentrations of maltol in the ranges of 8.00 × 10 −7 to 4.00 × 10 −5 and 4.00 × 10 −5 to 5.40 × 10 −4 mol L −1 , with a detection limit of 6.50 × 10 −8 mol L −1 . The performance of the developed method was validated in terms of linearity ( r = 0.9981 and 0.9955), recovery (97.0−99.3 %), reproducibility (relative standard deviations ≤ 3.1 %, n = 6), and robustness. The method shows excellent sensitivity, selectivity, and reproducibility and has been successfully applied to analyzing maltol in a wide variety of food products.
研究领域:
食品科学
·
电化学分析
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2023
·Vol. 29
·期 3
·1221-1228
·
IF 2.8
Qi Min,Wang Xiangnan,Shu Hui,Dong Yihang
(8YSZ) 1− x (Cr 2 O 3 ) x ( x = 0, 0.05, 0.10, 0.15) are prepared by the co-precipitation method. Diffraction peaks of the samples belonged to the cubic fluorite structure. Conductivity decreases first and then increases with increasing Cr 2 O 3 content. An oxygen sensor based on 8YSZ solid electrolyte and (8YSZ) 0.85 (Cr 2 O 3 ) 0.15 diffusion barrier is prepared by the Pt slurry bonding method. The sensor has a limiting current plateau at 2% oxygen concentrations within 720 ~ 870 °C. The oxygen sensor has a linear relationship between the log I L and 1000/ T . At 850 °C, a linear relationship between the limiting current I L and oxygen concentration x (O 2 ) is established for the oxygen sensor. The oxygen sensor is provided with a limiting current plateau within the experimental concentration division, and the limiting current plateau is not affected by x (CO 2 ) and p (H 2 O). I-V curves of the oxygen sensor overlap, and the limiting current plateaus are almost equal under the long-term high-temperature operating conditions of 144 h.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
Cell Reports Physical Science
·
2025
·
IF 7.3
Zhongzhe Wei,Xu Liu,Mingxuan Wang,Yao Lv,Songtao Huang,Jing Wang,Ming Jiang,Zhixiang Yang,Zihao Yao,Sheng Dai,Xiaonian Li,Jianguo Wang
The semi-hydrogenation of alkynes represents a paramount chemical transformation in the synthesis of fine chemicals and pharmaceuticals. However, the structural evolution of active sites during the reaction remains elusive. Here, we constructed a self-adaptive Pd/Nb 2 O 5 catalyst for efficient semi-hydrogenation of alkynes. Mechanistic studies disclose that Pd/Nb 2 O 5 intelligently modulates its structure in response to the specific alkyne type, efficiently preventing Pd poisoning by weakening the strong adsorption of alkynes. During the hydrogenation of aliphatic alkynes, the Pd/Nb 2 O 5 interface undergoes dynamic changes, generating oxygen vacancies (O v ) in situ through hydrogen spillover. In contrast, for the case of reactants of aromatic alkynes, the interface sites remain relatively stable. Coverage-dependent kinetics reveal that the dynamic O v formation of Pd/Nb 2 O 5 is determined by the distinct adsorption mechanism of aromatic and aliphatic alkynes. Due to the evolving interface, Pd/Nb 2 O 5 exhibits a high turnover frequency value of 55,338 h −1 , breaking the linear scaling relationships.
研究领域:
催化
·
化学反应工程
·
材料科学
·
有机合成
✓ 已验证
产品关联
DOI
高影响因子
OPTICS EXPRESS
·
2021
·Vol. 29
·期 9
·13530-13541
·
IF 3.894
Ran Yan,Ran Yan,Guofeng Sang,Guofeng Sang,Bin Yin,Bin Yin,Songhua Wu,Songhua Wu,Muguang Wang,Benran Hou,Mingquan Gao,Rong Chen,Han Yu
A temperature self-calibrated potential of hydrogen (pH) sensor based on the single mode fiber-tapered dual core photonic crystal fiber-single mode fiber (SMF-TDCPCF-SMF) structure cascaded with a fiber Bragg grating (FBG) is proposed and demonstrated. The TDCPCF structure formed Mach-Zehnder interferometer (MZI) is modified with a coating of graphene oxide/polyvinyl alcohol (GO/PVA) hybrid hydrogel to realize the measurement of pH, and the uncoated FBG is used to calibrate temperature. In our experiment, the sensitivity coefficient of 0.69 nm/pH with R2=0.99 and the hysteresis loss of less than 0.007 are achieved within the pH range from pH 4.00 to pH 9.85. The measured response time from pH 7.00 to pH 4.00, 6.00 and 9.85 are no higher than 10s. Moreover, the resonant wavelengths of MZI and FBG also exhibit good linear relationship with the temperature sensitivity coefficient of 0.15 nm/°C (R2=0.99) and 0.09 nm/°C (R2=0.97) respectively. It is demonstrated successfully that the proposed sensor has broad application prospects in the field of environmental monitoring, biological sensing and chemical analysis, due to the good performance of the temperature self-calibrated pH monitoring, repeatability, linearity, response time and reversibility.
研究领域:
环境监测
·
生物传感
·
化学分析
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）