SENSORS
·
2018
·Vol. 18
·期 10
·3252
·
IF 2.475
Feng Zhang,Xiaojie Wang,Xu Jie,Weili Wei
Fatty acids (FAs) are of interest to the areas of food science and medicine because they are important dietary sources of fuel for animals and play important roles in many biological processes. The health effects of FAs are different due to the diversity of olefinic bonds in the alkyl chains including number, position and configuration. However, the discrimination of FAs is difficult from a chemical sensing perspective due to the lack of diversity in terms of functional groups. Until now, only a few chemosensors have been developed for selective sensing of FAs based on their overall shape, however they are still limited in discrimination of FAs with subtle structural differences, moreover, they cannot be used for rapid and in situ inspections. Herein, for the first time, we designed a test paper for in situ colorimetric inspection for FAs based on the combination of the highly selective binding of Ag+to olefinic bonds and Ag+mediated color variation of 3,3′,5,5′,-tetramethylbenzidine. As a result, the sensor exhibited high sensitivity and good selectivity for five FAs with subtle structural differences. Furthermore, our method described herein was successfully applied to monitor the structural variations of FAs and quality changes in mixture edible hot pot oils with heat treatment in time course. Hence, the test paper presented herein holds great potential in the inspection of fats and edible oils in food industries.Keywords:test paper;colorimetric sensor;fatty acid;edible oil
研究领域:
食品科学
·
医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Yong Wang,Huan Zhou,Luohua Guo,Yun Qu,Qianfen Zhuang
Copper(II) ions (Cu2+) and disodium ethylenebis(dithiocarbamate) (nabam) are critical environmental pollutants, requiring rapid, sensitive, and selective detection methods. This work presents a photoresponsive colorimetric sensor using a carbon dot (CD) with oxidase-mimetic activity for dual detection of Cu2+ and nabam. Hydrothermally synthesized from 1,2,3,4-butanetetracarboxylic acid and o-phenylenediamine, the CD exhibits high ultraviolet light-driven oxidase-like activity due to its energy band alignment with the redox potentials of photocatalytic oxygen reduction and water oxidation, facilitating the generation of reactive oxidizing species (hydroxyl radicals, superoxide radicals, and photogenerated holes). These species oxidize colorless 3,3′,5,5′-tetramethylbenzidine to a blue product. Cu2+ detection is achieved via its suppression of the CD activity through CD–Cu complexation and valence band negative shifting, yielding a linear range of 0.01–0.5 μM and a detection limit (LOD) of 3.3 nM. Subsequent addition of nabam restores the CD activity by sequestering Cu2+ through complexation, enabling nabam detection with a linear range of 0.05–1.5 μM and a LOD of 23 nM. The sensor demonstrates high selectivity against potential interferents and is successfully applied to quantify Cu2+ and nabam in environmental water and wheat grain matrices. This study advances nanozyme-based sensing platforms by integrating photoresponse modulation and chelation chemistry for multiplex environmental monitoring.
研究领域:
环境科学
·
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
LUMINESCENCE
·
2020
·Vol. 35
·期 7
·1036-1042
·
IF 1.855
Xiaoxiao Sun,Yuqi Zhao,Xiaoqian Cui,Ruxin Liu,Miao Yu,Qiang Fei,Qingwen Liu,Guodong Feng,Hongyan Shan,Yanfu Huan
A highly sensitive and selective colorimetric analysis method based on unmodified gold nanoparticles (AuNPs) to detect iodide ions (I − ) in solution in the presence of hexadecyl trimethyl ammonium bromide (CTAB) and mercury ions (Hg 2+ ) has been successfully developed. Hg 2+ could form a gold amalgam with AuNPs to protect AuNPs from CTAB-induced aggregation caused by the electrostatic attraction between CTAB and citrate ion-covered AuNPs. When a mixture of Hg 2+ and I − was added to the solution of AuNPs, the formation of the HgI 2 complex destroyed the protection of Hg 2+ for AuNPs, which led to the aggregation of AuNPs accompanied with the change in colour of the solution from red to grey black and decrease in the absorbance of AuNPs at 520 nm. There was a good linear relationship between A 520nm and I − concentration from 0 to 800 nM with a low limit of detection (LOD) of 4.2 nM. Furthermore, this simple and reliable colorimetric sensor has been applied successfully to the detection of I − in practical samples.
研究领域:
分析化学
·
纳米技术
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TETRAHEDRON LETTERS
·
2014
·
IF 2.391
Lianfang Chen,Hongmei Nie,Guangbo Zhang,Fuwen Gong,Yuzhu Yang,Chengbin Gong,Qian Tang,Kun Xiao
This Letter aimed to develop an efficient method for the determination of cyanide ion (CN − ). A novel colorimetric chemosensor 4-[(1 E )-2-(4-hydroxyphenyl)ethenyl]-1-allylpyridinium bromide (HPEAPB) was synthesized. HPEAPB displayed good selectivity toward CN − over other competing anions in ethanol. A color change from yellow to red was immediately observed upon the addition of CN − and the limit of detection (LOD) was 3.4 × 10 −6 mol L −1 . The sensing mechanism was discussed by UV–vis, 1 H NMR titration, and a comparison study. Colorimetric test paper for CN − was prepared by attaching HPEAPB to a chromatography paper , which could be used to detect CN − in environmental samples as simply as a pH-indicator paper for pH value. The LOD of the test paper for CN − was 2.0 × 10 −4 mol L −1 . This detection method for CN − has potential applications in cyanide ion containing fields by combination of rapid and real-time advantages.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale Advances
·
2018
·Vol. 1
·期 3
·1207-1214
·
IF 0
Mohammed Hassan Ibrahim,Zhonghua Xue,Hassan Idris Abdu,Mahgoub Ibrahim Shinger,Ahmed Mahmoud Idris,Murtada Mohamed Edris,Duoliang Shan,Xiaoquan Lu
Nitrite ions (NO2−), as one of the important inorganic anions, exhibit considerable effects towards the environment and human health. Moreover, over intake of this anion may cause dangerous diseases. Herein, we successfully fabricated silver nanoparticles (AgNPs) using 4-amino-5-hydroxynaphthalene-2, 7-disulphonic acid monosodium salt (AHNDMS) and functionalized them with p-aminobenzoic acid (PABA), and used the functionalised AgNPs as a sensitive and selective colorimetric sensor for nitrite ions. The structure of the as-prepared pure AgNPs was experimentally characterized by different characterizations methods, namely, UV-vis, FT-IR, CV, DPVs, SEM, TEM, and XRD. Additionally, the nitrite ion sensitively and selectively changes the brownish yellow color of the dispersed AgNPs to pinkish red, indicating aggregation of AgNPs, with a detection limit of 0.016 ppm (0.348 μM) and 0.0069 ppm (0.149 μM) by the naked-eye and by UV-vis spectroscopy, respectively. The color change suggested that the aggregation of AgNPs was induced by nitrite-selective diazo-coupling. UV-vis spectra show the disappearance of the absorbance at 474 nm and appearance of a new peak at 532 nm, presumably due to the conversion of AgNPs to silver ions. Moreover, the studies of interference in the proposed sensor confirm its selectivity in the presence of anions as well as cations. Furthermore, linearity was observed between the absorption and the concentration of nitrite ions. More importantly, the proposed sensor was practicably applied for the determination of nitrite in different water samples, such as distilled water, river water, and tap water.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
PubMed
SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Zhengbo Chen,Tianhong Lou,Qian Wu,Kai Li,Lulu Tan,Jingyan Sun
In this contribution, we have developed a rapid method for the highly selective detection of mercury ions (Hg 2+ ) using citrate-stabilized triangular silver nanoplates (AgNPs). The colorimetric sensor strategy is based on the aggregation of Hg 2+ -coated AgNPs with the assistance of two amino groups of lysine, resulting in a color change of AgNP solution from blue to mauve or gray. The sensor enables the analysis of Hg 2+ with a minimum detectable concentration that corresponds to 50 nM. Meanwhile, the strategy offers excellent selectivity toward Hg 2+ against other cations. The validation of this method is carried out by analysis of Hg 2+ in tap water with satisfying recoveries over 91.35–106%.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 5
·1-10
·
IF 5.3
Yao Di,Zhou Liuyan,Hu Shengqiang,Zhao Shulin,Zhang Liangliang
The sensing sensitivity was improved for silver nanoparticles (AgNPs)-based colorimetric biosensors by using the most suitable salt to induce AgNPs aggregation. As for the salt composed of low-affinity anion and monovalent cation, the cation-dependent charge screening effect was the driving force for AgNPs aggregation. Apart from the charge screening effect, both the bridging of multivalent cation to the surface ligand of AgNP and the interaction between anion and Ag contributed to inducing AgNPs aggregation. Considering the higher aggregation efficiency of AgNPs resulted in a narrower sensing range, salt composed of low-affinity anion and monovalent cation was recommended for AgNPs-based colorimetric analysis, which was confirmed by fourfold higher sensitivity of DNA-21 detection using NaF than NaCl. This work inspires further thinking on improving the sensing performance of metal nanomaterials-based sensors from the point of colloidal surface science. Graphical Abstract
研究领域:
分析化学
·
纳米生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Shixuan Su,Shanshan Li,Jing Hu,Ting Yu,Lingchen Tao,Fuliang Hu,Yunlei Xianyu
Royal jelly as a functional food has great potential to promote human health. As a unique ingredient in royal jelly, 10-hydroxy-2-decenoic acid (10-HDA) is a vital criterion to evaluate the quality of royal jelly. Current approaches for 10-HDA detection mainly rely on high-performance liquid chromatographic (HPLC), but it requires large-scale equipment and skilled technicians that are costly and time-consuming. Herein, we report a colorimetric sensing strategy for 10-HDA detection based on Ag(I) and tetramethylbenzidine (TMB), a widely used chromogenic reagent. Ag(I) can oxidize TMB to generate oxidized TMB (oxTMB) showing a light-blue color. Due to the chelation with Ag (I), the introduction of 10-HDA can prevent the generation of oxTMB that results in a color fading and a decrease in absorbance. This colorimetric sensing strategy enables highly sensitive detection of 10-HDA with a linear range from 1 μM to 10 μM and a limit of detection of 0.13 μM. More importantly, this 10-HDA assay allows for a visual readout either by a smartphone or the naked eye with low cost, convenience, and rapid response that has been successfully applied for evaluating the quality of royal jelly in actual samples. The sensing strategy developed in this work provides a new colorimetric approach that holds great promise as a point-of-care platform for the food industry.
研究领域:
分析化学
·
食品科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2019
·
IF 4.191
Wei Guo,Hui He,Hongxiang Zhu,Xudong Hou,Xingjuan Chen,Shile Zhou,Shuangfei Wang,Lingtao Huang,Jiehan Lin
A biomass cellulose-based colorimetric sensor for Ag + and Cu 2+ was prepared by grafting 2,5-dithiourea (DTu) onto biomass-pulp cellulose. The as-prepared sensor (cellulose-DTu) showed excellent selectivity and sensitivity towards Cu 2+ over other common metal ions (Pb 2+ , Mn 2+ , Mg 2+ , Zn 2+ , Hg 2+ , K + , Al 3+ , Ca 2+ , Na + , Cd 2+ , Ni 2+ , Ba 2+ , and Li + ), exhibiting a color change from white to light grey. However, the sensor exhibited a remarkable color change from white to yellow-red upon the addition of Ag + . The naked-eye-detection concentration limits for Ag + and Cu 2+ were 10 −3 and 10 -4 mol/L, respectively. Furthermore, cellulose-DTu responded to both Ag + and Cu 2+ within 5 s. A mechanism for the selective identification of Ag + and Cu 2+ by cellulose-DTu was proposed based on 13 C solid NMR, XPS, and TEM analyses. In addition, the application of cellulose-DTu in real water confirmed that it exhibits the advantages of simplicity, rapidity, and high selectivity for in-situ identification of Ag + and Cu 2+ .
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Yue Qu,Tao Chen,Yuanhong Xu
It is in urgent to develop a facile sulfur ion (S 2- ) detection platform with good selectivity, sensitivity and portability, since the abnormal concentration of S 2- poses a serious threat to human health and environment. Nanozymes are expected as promising colorimetric probe for visual assays, but the selectivity is challenged since the mostly typical nanozymes are oxidoreductase-like ones while various analytes possess equivalent redox capacity. Herein, one-platform-two-channels detection method with both excellent selectivity and sensitivity was constructed based on the bifunctions of tin telluride (SnTe) nanobelts. On one hand, SnTe and S 2- can react rapidly to form a special brown product SnS to assure the selectivity; On the other hand, SnTe with peroxidase-like activity can oxidize 3,3’,5,5’-tetramethylbenzidine (TMB) to blue ox-TMB in the presence of H 2 O 2 , while strong reducing S 2- could inversely convert the solution from blue to colorless and then brown, enabling a wider range of S 2- detection (10 nM-900 μM) and low detection limit of 7.1 nM. In addition, this detection platform could still show excellent specificity against 19 other interfering substances in sulfur soaps with complex components. With the assistance of the color-to-value conversion function of a smartphone, a portable signal reading-out platform was established, which can successfully achieve the accurate visualization of the S 2− in 10 min
研究领域:
分析化学
·
环境科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Food Bioscience
·
2024
·
IF 4.8
Li-Hong Yu,Rui Jiang,Cheng-Lin Yang,Yue-Hong Pang,Xiao-Fang Shen
Glyphosate , a widely used herbicide due to the broad-spectrum and high-efficiency properties, has the potential to accumulate in the human body via agricultural food and water sources throughout the food chain. Its safety for both human health and aquatic ecosystems remains a topic of significant debate. In this study, the presence of glyphosate could be directly detected through a notable colorimetric change in an aqueous solution. For this purpose, a silver nanoparticle-functionalized copper porphyrin metal-organic framework (AgNPs/Cu-TCPP) nanozyme was conveniently prepared for colorimetric sensing of glyphosate. The as-synthesized nanozyme that modified AgNPs with Cu-TCPP metal-organic framework as the precursor, has excellent peroxidase mimetic activity and specific recognition performance of glyphosate. The nanozyme demonstrated the ability to catalyze the oxidation of 3,3,5,5-tetramethylbenzidine (TMB) using H 2 O 2 , resulting in a marked change in color. When glyphosate was added, which bonded with Cu 2+ , led to the occupation of the surface-active sites of the nanozyme, thereby making its catalytic performance ineffective. The concentration of glyphosate exhibited a linear range spanning from 2 to 400 μmol L −1 , and the limit of detection was 0.67 μmol L −1 (S/N = 3). The colorimetric sensing approach employing AgNPs/Cu-TCPP nanozyme exhibits remarkable selectivity and reproducibility, enabling the detection of real samples with recovery rates of 98.3%–103.5%, indicating its potential applicability in safeguarding water and food quality.
研究领域:
环境科学
·
分析化学
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2016
·
IF 2.567
Hong Du,Ruiyi Chen,Jianjun Du,Jiangli Fan,Xiaojun Peng
A gold nanoparticle-based colorimetric sensor for the determination of creatinine was developed as an important index for early diagnosis of kidney function and corresponding renal diseases. Because of the unique synergistic coordination capability of adenosine and creatinine with Ag+ on a particle surface, our system exhibits an excellent selectivity to creatinine among various ions and biomolecules. There are good linear relationships of absorption changes (A630 nm/520 nm) over creatinine concentrations, so both colorimetric qualitative detection by the naked eye and quantitative determination by UV–vis spectrometer could be realized with an excellent limit of detection compared with that of other methods. Finally, by testing creatinine in practical samples, such as urine mimic and bovine serum, good recoveries were obtained with proper relative standard deviations.
研究领域:
生物化学
·
医学诊断
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）