Jove-Journal of Visualized Experiments
·
2019
·
IF 1.108
Yalan Wu,Shengjun Wu,Xin-an Huang,Qingping Zeng,Tao Deng,Fang Liu
Primaquine (PMQ), an important anti-malarial drug, has been recommended by the World Health Organization (WHO) for the treatment of life-threatening infections caused by P. vivax and ovale. However, PMQ has unwanted adverse effects that lead to acute hemolysis in patients with glucose-6-phosphate dehydrogenase (G6PD) deficiency. There is a need to develop simple and reliable methods for PMQ determination with the purpose of dosage monitoring. In early 2019, we have reported an UV-Vis and naked-eye based approach for PMQ colorimetric quantification. The detection was based on a Griess-like reaction between PMQ and anilines, which can generate colored azo products. The detection limit for direct measurement of PMQ in synthetic urine is in the nanomolar range. Moreover, this method has shown great potential for PMQ quantification from human serum samples at clinically relevant concentrations. In this protocol, we will describe the technical details regarding the syntheses and characterization of colored azo products, the reagent preparation, and the procedures for PMQ determination.
研究领域:
药物分析
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医学诊断
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生物化学
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DOI
PubMed
高影响因子
Journal of Saudi Chemical Society
·
2025
·Vol. 29
·期 1
·1-12
·
IF 5.8
Zhang Jilai,Jian Dan,Hu Chenglei,Chen Wenhua,Jiang Ming,Wang Sheng,Su Youbo,Zhang Naiming,Si Zhihao,Lu Menglan
Dissolved organic matter (DOM) strongly influences the geochemical mobility of metal ions, yet little is known about the mechanism of lead (Pb) binding to DOM in the presence of copper (Cu) and zinc (Zn). This research used different types of ultraviolet–visible (UV–vis) spectroscopy analysis technologies, including differential log-transformed spectra coupled with spectral slope calculation, and two-dimensional correlation spectroscopy (2D-COS) analysis to investigate the binding characteristics between Pb and DOM in the presence of Zn and Cu, respectively. The results indicate that the addition both of Zn 2+ or Cu 2+ can reduce the binding of DOM to Pb 2+ , with the effect of Cu 2+ being the most obvious. Specifically, significant changes were evident in the differential log-transformed absorbance at higher Zn 2+ /Cu 2+ concentrations, including modified spectral shapes, absorption wavelength fluctuation, and differential absorption intensity changes. The differential log-transformed absorbance spectral slopes (∆S 350-400 ) exhibited a positive correlation with the predicted NICA-Donnan model value in a wavelength range of 350–400 nm. This suggested that ∆S 350-400 served as an indicator for assessing the complexation characteristics of Pb and DOM binding in the presence of Zn 2+ and Cu 2+ , respectively. The 2D-COS spectral results showed that the presence of Zn 2+ /Cu 2+ changed the binding order of the DOM functional groups in response to Pb 2+ . This study revealed that Zn 2+ and Cu 2+ competed with Pb 2+ for complex sites on the DOM surface in different ways, altering the ability of Pb 2+ to bind with DOM. The results suggest that using differential log-transformed spectroscopy combined with ∆S 350-400 and 2D-COS analyses is a promising approach to understanding the mechanisms of Zn 2+ /Cu 2+ effects on Pb-DOM interactions, which may provide new insights into the prevention, control, and remediation of environmental Pb pollution.
研究领域:
环境科学
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化学
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DOI
高影响因子
CRYSTAL RESEARCH AND TECHNOLOGY
·
2018
·Vol. 53
·期 9
·1800095
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IF 1.122
Jingru Zhao,Ming Yang
Self-assembly represents an energy-efficient way toward the configurable design of functional nanomaterials. In this paper, triangular silver nanoplates are shown to spontaneously form anisotropic assemblies in the solution. Nanochains consisting of face-to-face aligned nanoplates can reach hundreds of nanometers long after the dispersion of triangular silver nanoplates is allowed to age at room temperature for 1 week. The preferred face-to-face attachment is attributed to the maximized van der Waals attraction for a thermodynamically stable configuration as opposed to side-by-side attachment. Time-dependent UV–vis spectra show a gradual blue-shift along with the increase of aging time, indicating a likely stepwise growth of nanochains. The peak shift is however found to be much smaller than the results of finite-difference time-domain simulations based on the same sized nanoplates with ideally concentric face-to-face placement. Such discrepancy may be attributed to the possible misalignment and size variations of stacking nanoplates.
研究领域:
纳米材料
·
物理化学
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产品关联
DOI
高影响因子
SPECTROSCOPY LETTERS
·
2015
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IF 0.852
Bo Zhang,Yanbin Su,Lei Chen,Zhuofu Wu,Fengrong Zhang,Yanwen Su,Gang Zhao,Zhengqiang Li
The characteristic changes in UV-visible and Raman spectra of lithocholic acid on E-2-Butenal for antiglioma are the maximum absorption peak of E-2-Butenal from 302 to 319 nm, the decreases of Raman signal of 1688 cm−1 and 1641 cm−1 in E-2-Butenal by lithocholic acid with the phenomenon of 1688 cm−1 splitting, and the disappearance of the band at 932 cm−1, which clearly displays the change of wagging in methyl. In the presence of mitochondrial protein deriving from glioma, the above mentioned effects of lithocholic acid on E-2-Butenal are more significant by Raman spectra detections. The molecular targets of lithocholic acid on E-2-Butenal are carbonyl group, conjugated double bonds, and methyl, respectively. The study concludes that the interaction between lithocholic acid and E-2-Butenal decreases the carbonyl group bond strength in E-2-Butenal and then changes the structure and function of E-2-Butenal. The internal cause of the interaction between lithocholic acid and E-2-Butenal leading to the change of the carbonyl group bond strength is the electronic delocalization near the carbonyl group bond in E-2-Butenal. Since E-2-Butenal derives from glioma in the process of lipid peroxidation of mitochondria, our investigation significantly contributes to understanding the mechanism of action of lithocholic acid as a potential antiglioma drug.
研究领域:
生物化学
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药物学
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肿瘤学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2016
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IF 2.758
Weixuan Zeng,Xianfeng Yang,Minghui Shang,Xiewen Xu,Weiyou Yang,Huilin Hou
The tailored doping levels towards the band gap tunability are one of the challenges to push forward the potential application of one-dimensional (1D) ZnO nanostructures in the opto/electric nanodevices . In present work, we reported the exploration of Mg-doped ZnO nanofibers via electrospinning of polyvinylpyrrolidone (PVP), Zn(CH 3 COO) 2 (ZnAc) and Mg(CH 3 COO) 2 (MgAc), followed by calcination in air. The resultant products were systematically characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscope (HRTEM), and X-ray photoelectron spectroscopy (XPS). The optical measurements (UV–vis) of the Mg-doped ZnO nanofibers suggested that the optical band gaps of the ZnO nanofibers could be tuned from 3.33 to 3.40 eV as a function of the Mg doing levels. This tunability of the band gap of ZnO nanofibers with an intentional impurity could eventually be useful for optoelectronic applications .
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
PLoS One
·
2022
·Vol. 17
·期 2
·e0264532
·
IF 3.752
Zhehua Xue,Lei Li
Controlling the manganese (Mn 2+ ) concentration is important to product quality in the electrolytic manganese industry. Conventional methods for detecting Mn 2+ are complex and reagent-consuming, which makes them slow and polluting. It is of great significance to develop a new fast and environmentally friendly method to quantify Mn 2+ in electrolyte. The characteristic ultraviolet-visible (UV-vis) absorbance at 401 nm of Mn 2+ will vary linearly with the Mn 2+ concentration after data correction. Adjusting the pH, calibrating the spectral bandwidth (SBW) and optical path length (OPL), and subtracting the interference from coexisting substances by linear interpolation improve the measuring accuracy. Mn 2+ concentration can be determined by direct fast UV-vis absorbance measurement at characteristic peaks without using harmful reagents which facilitates such measurement to be applicated as on-line detection method for electrolytic manganese industry. The method developed in this study will help achieve the goal of improving the detection speed while cutting back on pollutant discharge from concentration analysis process in electrolytic manganese industry.
研究领域:
环境科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Lan Chen,Xiaoxiao Wei,Huan Wang,Min Yao,Liming Zhang,Göran Gellerstedt,Mikeal E. Lindström,Monica Ek,Shuangfei Wang,Douyong Min
An ionization difference UV–Vis method ( Δε -spectrum method) is the most potentially simple method for fast quantitation of phenolic hydroxyl groups (ph-OH) in lignin. However, the underestimated results were calculated from the conventional Δε -spectrum method using one- or two-point wavelengths measurement. In this study, a modified Δε -spectrum method using multi-point wavelengths measurement was developed and the negative absorbance was also considered. Four main typical lignin models, e . g . vanilla alcohol, 5-5 biphenyl , stilbenoid and vanillin , were applied as the guaiacyl-type (G-type) phenolic models for the determination of ph-OH by the modified Δε -spectrum method. The 2-methoxyethanol/water/acetic acid = 8/2/0.2 ( V /V/V) was used as the acidic solvent system and the 2-methoxyethanol/0.2 M NaOH solution = 1/9 ( V /V) was used as the alkaline solvent system. The ph-OH contents in the spruce milled wood lignin (SMWL) and the spruce Kraft lignin (SKL) were respectively quantified by the modified Δε -spectrum method as 1.078 and 4.348 mmol/g, which were comparable to the counterparts determined by 31 P Nuclear Magnetic Resonance Spectroscopy ( 31 P NMR). The results revealed that the modified Δε -spectrum method can provide more accurate and reliable results compared to the conventional method.
研究领域:
林产化学
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分析化学
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DOI
高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 7
·499
·
IF 3.504
Guangyang Liu,Ruonan Zhang,Lingyun Li,Xiaodong Huang,Tengfei Li,Meng Lu,Donghui Xu,Jing Wang
Monitoring of low levels of chlorsulfuron in environmental water samples is important. Although several detection methods have been developed, they all have some drawbacks, such as being time-consuming, requiring expensive instruments and experienced operators, and consuming large volumes of organic solvents. There is an urgent need for a simple, rapid, and inexpensive detection method for chlorsulfuron. Herein, such a method was developed using anti-aggregation of gold nanoparticles (AuNPs) in the presence of acetamiprid in agricultural irrigation water samples. Aggregation of the AuNPs was induced by acetamiprid, and this produced a distinct color change from Bordeaux red to blue. However, the strong hydrogen bonding interaction between chlorsulfuron and acetamiprid could inhibit AuNP aggregation. The effect of chlorsulfuron on the anti-agglomeration behavior of AuNPs was monitored by ultraviolet–visiblespectroscopy (UV-Vis) and the naked eye over a concentration range 0.1–100 mg/L. The detection limit for chlorsulfuron was 0.025 mg/L (signal-to-noise ratio of three). This colorimetric method was successfully applied to the determination of chlorsulfuron in spiked tap water and agricultural irrigation water with satisfactory recoveries (76.3%–94.2%).
研究领域:
环境科学
·
分析化学
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DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Fei Cheng,Taiming Zhang,Chunhua Yang,Hongqiu Zhu,Yonggang Li,Tao Sun,Can Zhou
To determine the total iron concentration in aqueous solutions containing complexing matrix, a direct and rapid ultraviolet–visible spectroscopy determination method was developed using the Nitroso R salt as a chromogenic reagent. In the presence of NaI and CTMAB, the experiment shows that Nitroso R salt-Fe complex can produce a significantly sensitive and selective absorbance peak at 710 nm with no notable time for sensing. The experimental factors that affect the procedure such as temperature, acidity and dosages of various reagents were analyzed and optimized. Under the optimized experimental conditions, the limit of detection and limit of quantification of the method was 4.5 × 10 −8 and 1.5 × 10 −7 mol/L. The calibration curve was obtained in a wide linear range of 1.5 × 10 −7 -6.4 × 10 −5 mol/L with good linearity (R 2 = 0.9989). The method was free of any interference with common ions and can determine the iron content in the complex matrix of aqueous samples. The methodology was further validated by the certified reference water samples used for environmental monitoring and agreed with the ICP-OES spectrophotometry results. Compared with the conventional method, the relative standard deviations of the spike test in various actual samples were in the range of 0.31%-2.9% ( n = 5). Good recoveries between 96.4% and 107% were obtained. The proposed method provides great promise for application in-field analysis of iron content in various environmental samples and hydrometallurgical solutions owing to its high sensitivity, low cost, good reproducibility, and no need for any complex pretreatment.
研究领域:
分析化学
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环境科学
·
冶金工程
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DOI
高影响因子
SENSORS
·
2018
·Vol. 18
·期 8
·2525
·
IF 2.475
Zhengjun Huang,Linlin Zheng,Feng Feng,Yuyuan Chen,Zhenzhen Wang,Zhen Lin,Xinhua Lin,Shaohuang Weng
Simple and effective methods for the detection of the level of blood glucose are closely linked to the monitoring of people’s health. In the study, MnO2nanosheets with absorption range of 300 nm~500 nm and obvious yellow color were easily prepared and applied to detect glucose through their absorbance and color. The proposed method is based on the fact that a specific concentration of glucose can be quantitatively transformed into hydrogen peroxide (H2O2) under the catalytic effect of glucose oxidase. Based on the redox reaction of MnO2with H2O2, yellow MnO2can be converted into colorless Mn2+to monitor the concentration of glucose. Under optimal conditions, a simple and effective visual assay for the sensitive and reliable detection of glucose was developed. The linear range was estimated to the range from 0 μM to 100 μM, with a detection limit of 12.8 μM. Furthermore, the proposed colorimetric assay based on MnO2nanosheets can effectively detect blood glucose of clinical serum samples with accuracy and convenience.Keywords:glucose;colorimetric assay;MnO2nanosheets;UV-vis;quantitative determination
研究领域:
生物化学
·
医学检测
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产品关联
DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2019
·
IF 5.256
Nan Wang,Gang Liu,Hongxiu Dai,Houyi Ma,Meng Lin
We demonstrated an interesting phenomenon that the electrochemical reduction of mercury ions (Hg 2+ ) caused distinctly different morphology of gold nanorods (Au NRs) depending on the concentration of Hg 2+ . Specifically, in the case of low concentration, mercury formed through electrochemical reduction only deposited onto the gold surface, and then could be reversibly removed from the gold surface by electrochemical stripping process without causing obvious changes of Au NRs in shape and size. But in the case of high concentration, the reduced Hg not only deposited onto the gold surface but also entered into the interior of Au NRs making them change into gold nanospheres (Au NSs) in an irreversible manner due to the alloying effect of gold with Hg. In this situation, even though the most of Hg was removed, the Au NSs can no long return to the previous rod shape. The changing trend of Au NRs was characterized well by measuring the corresponding UV–Visible spectra. The formation of the Au/Hg nanoalloy was confirmed by high-resolution transmit electron microscopy (HR-TEM) and X-ray photoelectron spectroscopy (XPS) results. The present study is helpful for having better understanding of the mechanism of electrochemical mercury-analysis by Au nanoparticles , and necessary to optimize the Au nanoparticles-based Hg sensing strategies.
研究领域:
纳米材料科学
·
电化学分析
·
表面化学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2021
·Vol. 12
·期 1
·475-482
·
IF 3.361
Yongshan Ma,Yanzhao Xia,Yanyan Zhu,Fengxia Zhang,Jingcheng Cui,Tianyi Jiang,Xiangfeng Jia,Xuemei Li
A novel fluoride (F−) colorimetric and fluorescent probe (P1) based on a core-extended perylene tetra-(alkoxycarbonyl) (PTAC) derivative was developed. The probe exhibited high sensitivity and selectivity for distinguishing F− from other common anions through significant changes of the UV-Vis and fluorescence spectra. Job's plot analysis revealed that the stoichiometry of the P1–F− interaction is 1 : 1. The association constant between P1 and F− was estimated to be 9.7 × 102 M−1 and the detection limit of F− was about 0.97 μM. An approximately 76 nm red-shift in the absorption and fluorescent quenching response was observed when F− was associated with P1. The emission intensity (I574) decreased linearly along with the F− concentration from 3 × 10−5 M to 2 × 10−4 M. The mechanism of intermolecular proton transfer (IPT) was deduced based on the changes in the absorption, fluorescence, electrochemistry, and 1H NMR titration spectra. The density functional theory (DFT) theoretical results of the P1–F− complex are in good agreement with the experimental results. The rapid detection of F− ions in the solid state and living cells was also studied.
研究领域:
分析化学
·
生物医学
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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）