SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Chunsong Lu,Jie Liu,Lanlan Gan,Xiaoming Yang
Distinguishing the isomers is considered to be challenging, and shows the great importance in the biochemical and pharmaceutical fields. Herein, the blue carbon dots (CDs) were successfully raised on the basis of a facile hydrothermal way, since Cryptococcus served as the carbon source. Importantly, the as-prepared CDs were employed to achieve the differentiation and detection of two benzenediols. To be specific, the fluorescence of CDs was enhanced once m -benzenediol (resorcinol) was added, while introducing p -benzenediol (hydroquinone) lead to their fluorescence quenching. Towards the mechanism, the addition of m -benzenediol promoted the formation of hydrogen bonds between m -benzenediol and CDs, and thus resulting in their enhanced fluorescence. In contrast, the fluorescence quenching occurred due to the electron transferring from the rich-electrons of CDs to p -benzoquinone, when p -benzenediol was oxidized to be p -benzoquinone. Therefore, a differentiating strategy of two isomers has been proposed, and also contributed to detecting m -benzenediol and p -benzenediol concentrations in the ranges of 2 × 10 −3 to 1 × 10 −7 M and 2 × 10 -5 to 2 × 10 -9 M, respectively. Although there already existed the high performance liquid chromatography and other chemical methods for determining benzenediols, the current strategy provided a new way of distinguishing and assaying the isomers of benzenediols.
研究领域:
化学
·
材料科学
·
分析化学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Wang Ren,Ying Zhang,Wen Yong Liang,Xiu Pei Yang,Wei Dong Jiang,Xiao Hong Liu,Wei Zhang
Visual detection is favorable for the field monitoring and routine analysis of environmental pollutants. Specially, the change of fluorescent color instead of fluorescence brightness is particularly convenient for the visual monitoring. In this study, a facile, rapid and sensitive ratiometric fluorescence sensor is developed for visual discrimination of trace resorcinol (RS) from its isomers and analogues. Specific coupling reaction between RS and dopamine (DA) generates fluorescent azamonardine (AZMON) within 2 min, and the blue fluorescence intensity increases with the RS concentration. Furthermore, after red light-emitting Au nanoclusters (AuNCs) are added into the mixture of RS and DA, the fluorescence signal at 656 nm keeps unchanged, and the fluorescence intensity at 460 nm is positively correlated with RS concentration. Moreover, the increasing concentration of RS triggers the obvious change of fluorescent color from red to blue based on the red background fluorescence of AuNCs, and RS as low as 5.0 nM can be directly identified with naked eye. Herein, the reference signal of AuNCs facilitates the ratiometric and visual sensing of RS. The proposed sensor has been successfully applied to determination of RS in real water samples, and is convenient for the routine analysis and field monitoring of trace RS.
研究领域:
分析化学
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环境科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2017
·
IF 3.671
Chaofan Ding,Yuanling Sun,Yanhui Wang,Jianbo Li,Yanna Lin,Weiyan Sun,Chuannan Luo
A simple chemical bonding method to synthesize magnetic cellulose–poly(dopamine) (Fe 3 O 4 @ [email protected] ) was reported. The adsorption behaviors of resorcinol in aqueous solution on Fe 3 O 4 @ [email protected] were systematically investigated. As the results shown that, with the advantage of high surface area, abundant hydroxyl and amino groups of Fe 3 O 4 @ [email protected] , and the magnetic property of Fe 3 O 4 , the resorcinol can be easily and rapidly extracted from the water by magnetic attraction under investigation. The adsorption equilibrium of Fe 3 O 4 @ [email protected] for resorcinol corresponded with Freundlich isotherm, and the novel adsorbent exhibited better resorcinol removal efficiency in solutions with low pH. It was found that the resorcinol adsorption performance of Fe 3 O 4 @ [email protected] strongly depends on their surface charge concentration and specific surface area. These results provide evidences for estimating and optimizing the removal of phenols from the wastewater by using of Fe 3 O 4 @ [email protected] composites in the future.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
ANALYST
·
2019
·Vol. 144
·期 15
·4520-4525
·
IF 4.019
Haiqing Zhang,Yan Xiao,Xiuhua Zhang,Shengfu Wang
Using a simple fluorogenic reaction and the inner filter effect, a label-free ratiometric method for biothiol detection is developed. The reaction between dopamine and resorcinol can generate azamonardine with strong fluorescence. Since the absorption spectrum of azamonardine overlaps with the excitation spectrum of the mercaptopropionic acid-stabilized CdTe quantum dots (MPA-CdTe QDs), the emission of QDs can be quenched via the inner filter effect in the presence of azamonardine. Biothiols can inhibit the above fluorogenic reaction, resulting in the weakening of the fluorescence of azamonardine and the recovery of the emission of MPA-CdTe QDs. The fluorescence intensity ratio of azamonardine to MPA-CdTe QDs can be used to detect biothiols. This approach exhibited a linear trend to the biothiol concentrations in the range of 2 μM to 12 μM, with a limit of detection of 0.6 μM (S/N = 3). This ratiometric analysis strategy was further applied to detect biothiols in human serum samples, showing their great application potentials in real biological samples. The constructed method is simple, easy to prepare, and low-cost.
研究领域:
分析化学
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生物医学
✓ 已验证
DOI
PubMed
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
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2012
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IF 0.941
Hong-Wei WU,Mei-Lan CHEN,Dan SHOU,Yan ZHU
A novel method was established for the simultaneous determination of resorcinol and phloroglucinol in environmental water samples by ion chromatography with chemiluminescence detection. Using 50 mM NaOH as eluent, resorcinol and phloroglucinol can be separated well with IonPac AS19 column and determined on the basis of chemiluminescence reaction of luminol and K 4 Fe(CN) 6 in a alkaline medium. The optimal CL conditions were 6.0 × 10 −4 M luminol, 0.1 M K 4 Fe(CN) 6 and 5.5 × 10 −5 M K 3 Fe(CN) 6 . The absence of methanol and acetonitrile in mobile phase made the proposed method more sensitive. Under the optimal conditions, the detection limit (LOD) of resorcinol and phloroglucinol were 4.0 and 4.3 μg L −1 , respectively. The method showed good linearity within the range of 0.05-1.0 mg L −1 . The relative standard deviations (RSD) for 0.1 mg L −1 resorcinol and phloroglucinol standard solutions were 0.9% and 1.1% ( n = 11). The method was successfully applied to the determination of resorcinol and phloroglucinol in environmental water samples.
研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 5
·1-9
·
IF 5.479
Ren Hailong,Zhang Yang,Liu Longlong,Li Yangguang,Wang Dongyang,Zhang Ruyue,Zhang Wenjing,Li Yingchun,Ye Bang-Ce
Hollow molybdenum-dopamine spheres were synthesized and thermally annealed to form hollow Mo 2 C/C spheres. The morphology, composition and electrochemical behavior of spheres were characterized. A glassy carbon electrode (GCE) was modified with the spheres and then used for simultaneous detection of hydroquinone (HQ), catechol (CC), and resorcinol (RS). Distinct oxidation peaks can be observed for HQ, CC and RS at potentials of −0.004 V, 0.10 V and 0.44 V (vs. SCE). The responses to HQ, CC and RS are linear in the concentration ranges of 0.3~1000 μM, 2~2000 μM and 3~600 μM, respectively. The corresponding detection limits are 0.12, 0.19 and 1.1 μM (at S/ N = 3). The sensor was then applied to quantify HQ, CC, and RS in tap water, river water and vegetable juice. Recoveries ranged from 93.5% to 106.5%. The modified GCE is repeatable, reproducible, stable and selective for HQ, CC and RS.
Schematic presentation of a novel electrochemical sensor based on a glassy carbon electrode modified with hollow Mo 2 C/ carbon spheres for determination of hydroquinone, catechol, and resorcinol.
研究领域:
材料科学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Scientific Reports
·
2024
·Vol. 14
·期 1
·1-10
·
IF 3.8
Guo Jingqiao,Xin Jianhui,Wang Jine,Li Zhen,Yang Jianlei,Yu Xue,Yan Mengxia,Mo Jiangyang
Tetracyclines (TCs) rank second globally in the use of animal infection therapy and animal husbandry as growth promoters among all antibiotics. However, large amounts of TCs residue in food products and more than 75% of TCs are excreted into the environment, causing adverse effects on the ecological system and human health. It has been challenging to simultaneously realize low-cost, rapid, and highly selective detection of TCs. Here, inspired by the fluorogenic reactions between resorcinol and catecholamines, we find the fluorescence quenching ability of tetracycline (TC) and firstly propose a fluorescent “turn-off” detection of TC using dopamine and 4-fluororesorcinol. The optimal reaction condition for the fluorescent assay is investigated and the optimized probe showed a good limit of detection (LOD of 1.7 µM) and a wide linear range (10 µM to 350 µM). Moreover, this fluorescent assay proved to be an effective tool for detecting TC in river, Sprite, and beer samples, which represent the aquatic environments and food and may contain tetracyclines residues. Finally, the high selectivity of the method for TC has been confirmed by eliminating the interference from common substances. The proposed strategy provides a high-efficiency and selective solution for the detection of TCs in environment and food and the application fields of this fluorescent assay could be further expanded in the future.
研究领域:
环境科学
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食品科学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Xiaoyi Xu,Zhimin He,Hui Tang,Yidong Sun,Shuyuan Zhang,Dezhi Shi,Fangying Ji
In this study, using furfuryl alcohol as the precursor carbon and mesoporous silica as the template, and furfuryl alcohol-derived mesoporous carbon (FMC) was prepared. The specific surface area of FMC was 1022.61 m 2 /g, the pore volume was 1.71 cm 3 /g, and the mesoporous volume was 98.8%. Based on the adsorption kinetics of pharmaceuticals onto the FMC in synthetic urine, equilibrium adsorption was reached in 120 min, and it followed a pseudo-second-order model. The adsorption isotherms were well-fitted by the Sips isotherm model, and the saturated adsorption capacities of diclofenac and oxytetracycline in fresh urine were 411.8 mg/g and 465.9 mg/g, respectively. Batch experiment results showed that pharmaceutical removal was strongly influenced by urine components such as sodium chloride, urea, and ammonium hydroxide. The adsorption of diclofenac and oxytetracycline was influenced by many factors including π-π interactions, hydrogen bonds , and electrostatic forces. FMC exhibited excellent reusability and retained urine nutrients during pharmaceutical adsorption.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysts
·
2022
·Vol. 12
·期 4
·378
·
IF 4.501
Feng Jiang,Jiansha Gao,Di Lang
Photocatalytic studies on contaminant degradation in water suspension generally suggest that the degradation reaction mainly takes place on the surface of the photocatalysts rather than in the water phase. The mechanism of selective degradation is often difficult to distinguish concerning the contribution of adsorption and radical selectivity. This study is thus designed to investigate the roles of two types of hydroxyl radicals, adsorbed hydroxyl radical (·OHa) and free hydroxyl radical (·OHf), on the selective degradation of catechol (CT) and resorcinol (RE). CT and RE are significantly different in adsorption on a TiO2photocatalyst with a highly exposed {001} facet. CT can be selectively degraded by TiO2and was highly correlated with adsorption. Free radical quenching experiment results showed that the degradation of CT can be identified as the combined effect of both ·OHaand ·OHf, while the degradation of RE was mainly due to the ·OHf. Electron paramagnetic resonance coupled with spin trapping agents was used to detect the relative concentration of hydroxyl radicals in all the photocatalytic degradation processes. After a series analysis, we proposed that the mechanism of selective degradation mainly depends on the concentration of ·OHffor the pollutant molecules with weak adsorption on the catalyst surface.Keywords:photocatalytic;TiO2;catechol;resorcinol;hydroxyl radical;degradation selectivity
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Xian-En Zhao,Ya-Nan Zuo,Yinghui Xia,Jing Sun,Shuyun Zhu,Guobao Xu
Although fluorescent nanozymes exhibit great potential in sensing fields, few current nanozyme-based sensors are designed to discriminate catechol (CC) from its two isomers. Herein, fluorescent metal-organic framework (MOF)-based nanozyme is utilized for ratiometric and selective detection of CC without the interferences of hydroquinone (HQ) and resorcinol (RC). NH 2 -Cu-MOF plays multiple roles: (1) it exhibits excellent photoluminescence at 435 nm owing to the 2-amino-1,4-benzenedicarboxylic acid ligand; (2) Cu 2+ imparts MOF oxidase activity to trigger the oxidation of o -phenylenediamine (OPD) into luminescent products (oxOPD) with emissive peak at 571 nm, which quenches the intrinsic fluorescence of NH 2 -Cu-MOF (435 nm) through inner filter effect (IFE); (3) Cu 2+ can complex with CC specifically to produce complex containing o -semiquinone, which not only inhibits MOF’s oxidase-like activity but also quenches the fluorescence of MOF. Therefore, the presence of CC induces the decrease of fluorescence at 571 nm followed by the slight recovery of fluorescence at 435 nm. Notably, HQ and RC have negligible influences on the fluorescence of NH 2 -Cu-MOFs/OPD system. Based on these facts, a ratiometric fluorescence platform for CC has been constructed. It exhibits high sensitivity towards CC with LOD of 0.1 μM.
研究领域:
分析化学
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生物传感
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2022
·
IF 3.841
Zhengjun Cheng,Yucong Fan,Lei Zhang,Chen Wang
A water-soluble, stable, simple, and dual ligands (bovine serum albumin and lysozyme) and Ag doping co-enhanced Au nanoclusters (Lys/BSA-Ag/AuNCs) was synthesized by one-step wet chemical synthesis. The introduction of Lys-and Ag could improve significantly the quantum yields of AuNCs (QYs, 2.54% to 12.73%). A new ratio fluorescent probe (RF-probe) was successfully obtained for sensitively and selectively mensurating 4-hexylresorcinol (4-HR) and Cr 6+ . That is, the fluorescence (FL) intensity of nanoclusters at 610 nm was used as the built-in reference, while dopamine (DA) reacting with 4-HR could produce a new fluorescent substance, and its FL intensities at 490 nm were enhanced gradually with increasing the concentrations of 4-HR. On the other hand, Cr 6+ will react with DA and consume the amount of DA reacting with 4-HR, resulting in the weakening of FL intensity at 490 nm, so the ratiometric fluorescence detection of Cr 6+ was also realized. The contents of 4-HR and Cr 6+ could be monitored by the RF-probe with linear ranges of 1.0–140.0 and 3.0–110.0 nM, and corresponding values of LOD (limit of detection) were calculated to be 0.16 and 0.37 nM (3σ/slope). Moreover, the proposed method was extended to the detections 4-HR and Cr 6+ in practical samples, and the results were consistent with those of the standard HPLC and UV–vis spectrophotometric methods. In addition, Lys/BSA-Ag/AuNCs exhibited an excellent temperature sensing performance in the range of 10.0–64.0 ℃.
研究领域:
分析化学
·
环境科学
·
生物传感
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2024
·
IF 5.6
Qing Liu,Si Chen,Yiming Nie,Qian Li,Fang Chen
4- n -butylresorcinol (4nBR) is a frequently utilized as whitening ingredients in skincare cosmetics. Compared with other whitening ingredients, it can effectively inhibit tyrosinase with lower toxicity and superior inhibition efficacy. Under alkaline conditions, an induced oxidative coupling reaction can occur between 4nBR and dopamine (DA) to generate strong fluorescent substance azamonardine with an intense emission band centering at 476 nm when excited at 440 nm. This phenomenon can be used to establish a fluorescence analysis method for 4nBR. The results indicated that the linear range of the method was 1.0–24.0 nmol L −1 , and the detection limit was as low as 0.25 nmol L −1 . The method showed high sensitivity, good selectivity, mild experimental conditions and low cost. The proposed method was successfully used to detect 4nBR in cosmetics, and the results were consistent with those of HPLC. The spiking recoveries were between 98.2% and 108 %.
研究领域:
分析化学
·
生物学
·
医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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