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
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
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
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环境科学
✓ 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
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2022
·Vol. 414
·期 14
·4217-4225
·
IF 4.478
Xue Yuting,Zhong Haotian,Liu Bin,Zhao Ruixue,Ma Jun,Chen Zhengbo,Li Kai,Zuo Xia
Nanozymes have both the high catalytic activity of natural enzymes and the stability and economy of mimetic enzymes. Research on nanozymes is rapidly emerging, and the continuous development of highly catalytic active nanozymes is of far-reaching significance. This work reports heteroatomic nitrogen (N) and phosphorus (P) double-doped mesoporous carbon structures and metallic Fe coordination generated sponge-like nanozymes (Fe/NPCs) with good peroxidase activity. On this basis, we constructed a highly sensitive colorimetric sensor with cysteine and phenol as simulated analytes using Fe/NPCs nanozymes, and the response limits reached 53.6 nM and 5.4 nM, respectively. Besides, the method has high accuracy in the detection of cysteine and phenol at low concentrations in serum and tap water, which lays a foundation for application in the fields of environmental protection and biosensors. Graphical abstract
研究领域:
生物化学
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环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CONTROL
·
2023
·
IF 6
Lian Xia,Jianxun Han,Xiaohuan Huang,Xiaojuan Niu,Xin Lin,Yuangen Wu
The overutilization of dimethoate may lead to its deposition in both the environment and crops, which potentially induces neurological, respiratory, and hepatic abnormalities upon absorption by organisms. Colorimetry can accurately determine dimethoate, but there are still many challenges in the rapid, convenient, and point-of-care detection. Herein, based on the inhibitory effect of dimethoate on the laccase activity of silver citrate (AgCit), a smartphone-assisted colorimetric sensor and rapid detection enzyme sheets were constructed. It was demonstrated that dimethoate could adsorb on the surface of AgCit and inhibit the production of semiquinone radicals in the reaction system. Then, the AgCit laccase activity was inhibited, causing the colorimetry sensor and the enzyme sheets turned light red or even colorless. The constructed sensor has higher sensitivity and the limit of detection for dimethoate is 1.0 μg⋅L −1 . Moreover, the developed enzyme sheets have good selectivity and specificity, and display the detection results within 5 min. Thus, the colorimetric sensor and the constructed enzyme sheets are expected to be used for large-scale preliminary detection of dimethoate residues in actual agricultural products.
研究领域:
环境科学
·
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Xiaoyu Yang,Zhichun Bi,Chenghui Yin,Shuyi Zhang,Donghui Song,Hui Huang,Yongxin Li
Tieguanyin (TGY) is one of top ten famous teas in China, but in the process of brand building there is the phenomenon of falsehood, thus harming the interests of consumers. To solve the adulterate problem of TGY, a colorimetric sensor array (CSA) based on peroxidase activity of nanozyme was constructed. Nanozymes can catalyze 3,3′,5,5′-tetramethylbenzidine (TMB) to 3,3′,5,5′-tetramethyl -[1,1′-bis(cyclohexyl)]-2,2′,5,5′-tetraene-4,4′-diimine (oxTMB), while the tea polyphenols (TPs) can inhibit this process, and the degree of inhibition varies significantly with the reaction time. We selected two nanozymes and three reaction time points to construct CSA. It can successfully distinguish TPs in TGY. The discriminative analysis can achieve: (1) distinction between TGY and adulterated tea, (2) discrimination of TGY in various seasons and seasonal adulteration in different degrees. The method constructed in this work is promising for both the class and quality differentiation of TGY and other teas with TPs as the main activity.
研究领域:
食品科学
·
分析化学
·
生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Leixin Liu,Shanshan Yuan,Chenxi Guan,Jian Zhou,Yi Yao,Qiliang Zhang,Fangli Gang
Hydrogen sulfide (H 2 S), as a toxic gas, is one of the occupational hazards to workers' health. Traditional H 2 S sensors often suffer from external circuits, measurement systems, liquid-phase reactions, or high detection limits. Herein, a colorimetric sensor for H 2 S detection was developed by incorporating colorimetric dye [lead acetate, Pb(OAc) 2 ] into polyacrylamide (PAM)/polyvinyl alcohol (PVA) hydrogel. Benefitting from the interpenetrating polymer network, non-covalent interactions such as hydrogen bonds and dense internal structure, the hydrogel exhibited excellent adhesion to different substances (adhesion strength up to 14.11 kPa) and mechanical properties (tensile strength up to 116.92 kPa, elongation rate up to 576%). Furthermore, due to the liquid-phase reaction system and excellent [Pb(OAc) 2 ] loading capacity provided by the hydrogel, the prepared sensors exhibited excellent sensing performance response time, sensitivity, and simplicity. The theoretical detection limit of the sensor was 0.69 ppm, and the minimum exposure time required for detection was 14 s. The colorimetric effect of the hydrogels was positively correlated with the addition of Pb(OAc) 2 and the extension of time. The results showed that the color change of PAM/PVA/Pb(OAc) 2 hydrogel can be visible to the naked eye even if the concentration of H 2 S is only 1 ppm. It is expected that this hands-free, arbitrarily adhesive, stretchable hydrogel colorimetric sensor strategy for visual detection of H 2 S will extend toxic gas alarm systems to a new level.
研究领域:
材料科学
·
环境科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2013
·
IF 3.535
Hao-Hua Deng,Chun-Lin Wu,Ai-Lin Liu,Guang-Wen Li,Wei Chen,Xin-Hua Lin
A convenient colorimetric sensor based on anti-aggregation of citrate-capped gold nanoparticles (AuNPs) is demonstrated for thiocyanate (SCN − ) sensing. The citrate-capped AuNPs aggregated readily in the presence of sulfuric acid , leading to a color change from red to blue. This particle aggregation could be suppressed by SCN − , which had strong protective effect on the gold colloid . The thiocyanate recognition suffers insignificant interference from most of common ions. With this strategy, 1 μM of SCN − can be recognized within 5 min by naked-eye observation. This simple, selective, and sensitive approach can be potentially applied for SCN − assays in environmental aqueous samples.
研究领域:
分析化学
·
纳米科技
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）