MICROCHIMICA ACTA
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2019
·Vol. 186
·期 2
·1-9
·
IF 5.479
Deng Ze-Hui,Wang Xia,Wang Xiao-Li,Gao Cui-Ling,Dong Liang,Wang Ming-Lin,Zhao Ru-Song
A magnetic covalent organic framework (Fe 3 O 4 @COF) with core–shell structure was fabricated at room temperature and used as an adsorbent for magnetic solid-phase extraction of polar endocrine-disrupting phenols (4-n-nonylphenol, 4-n-octylphenol, bisphenol A and bisphenol AF). The sorbent was characterized by transmission electron microscopy, FTIR, powder X-ray diffraction and other techniques. The main parameters governing the extraction efficiency were optimized. The phenols were quantified by HPLC with fluorometric detection. The method has attractive features such as low limits of detection (0.08–0.21 ng.mL −1 ), wide linear ranges (0.5–1000 ng.mL −1 ), and good repeatability (intra-day: 0.39%–4.99%; inter-day: 1.57%–5.21%). Satisfactory results were obtained when the developed method was applied to determine the four target pollutants in real world drink samples with spiked recoveries over the range of 81.3~118.0%. This indicates that the method is a powerful tool for the enrichment and determination of endocrine-disrupting phenols in drink samples.
A magnetite based covalent organic framework (Fe 3 O 4 @COFs) was synthesized with TPAB, TPA and Fe 3 O 4 . It was used for magnetic solid-phase extraction of endocrine-disrupting phenols from plastic-packaged tea drink samples coupled with liquid chromatography (LC) for determination.
研究领域:
分析化学
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环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
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2023
·
IF 5.9
Shengkai Luo,Yi Hou,Song-Qing Hu
Although the oxidation of tea polyphenols catalyzed by polyphenol oxidases (PPOs) is an attractive method for the synthesis of theaflavins (TFs), PPOs for synthesizing TFs were impure, and either not activated or activated by classical chemical methods. Herein, high pure PPO from Rosa chinensis (RcPPO) was cleanly and efficiently activated, and the MBP-RcPPO zymogen was successfully expressed in E. coli BL21 (DE3) with a high pure yield of 37.20 mg/L. Enzymatic activity of the RcPPO after proteolytic activation with trypsin in vitro increased to 5.52 times compared with the MBP-RcPPO zymogen, obtaining a 1625.00 U/L yield of activated enzyme with a specific activity of 480.77 U/mg for 25 mmol/L catechol, and could be enhanced by CuSO 4 , MgCl 2 , DMSO and ethanol. The MBP-RcPPO zymogen was specifically cleaved at the peptide bond of R (−5)-I (−4) for N-terminal, but not specifically cleaved at multiple cleavage sites for C-terminal during the activation with trypsin. RcPPO has been classified as tyrosinase with the obvious preference for diphenol compound substrates. Moreover, the four major TFs were synthesized from tea polyphenols extract by RcPPO with a higher efficiency than native PPO from Camellia sinensis , and the yield of TFs monomers could be furtherly improved using the corresponding purified tea polyphenols as substrate. The results indicated that activated RcPPO may serve as a promising biocatalyst for commercial-scale production of TFs.
研究领域:
生物化学
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分子生物学
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生物技术
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食品科学
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产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2019
·
IF 3.218
Wei Chen,Jiayue Dong,Sihan Zhou,Chunyong Zhang,Degang Fu
1-naphthol (1-NAP) and 2-naphthol (2-NAP) are both hazardous pollutants which pose great threat to our living environment. In the current work, a comparative investigation on the electrochemical mineralization of 1-NAP and 2-NAP using boron-doped diamond (BDD) anode was presented. Experiments were carried out using synthetic 1-NAP or 2-NAP solutions containing Na 2 SO 4 as supporting electrolyte . A two-level factorial design methodology was adopted to optimize the mineralization process, six mathematical models were thus constructed and used to explore the structure-property relation involved. The results obtained suggested that 1-NAP was easier and faster to break down than 2-NPA under the same oxidation conditions, which were in line with the outcome obtained from cyclic voltammetry , HPLC and TOC measurements. To understand the destruction mechanism, the electron structures of 1-NAP and 2-NAP were further examined by the quantum chemistry calculations with density functional theory. It was also found that the results from frontier orbital analysis could well explain the differing mineralization performances recorded in BDD anode cell. Finally, with the aid of LC/MS analysis, the oxidation pathways of 1-NAP or 2-NAP on BDD anodes were proposed.
研究领域:
环境科学
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电化学
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DOI
高影响因子
MICROCHEMICAL JOURNAL
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2024
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IF 4.9
Aijuan Xie,Linghui Cao,Tianyu Shen,Yuanxinyi Zhou,Haoye Wang,Shiping Luo
As para -aminophenol (PAP) is toxic to humans, causing skin irritation, eye damage, and central nervous system depression, and it can form as a degradation product of paracetamol (PAT) under certain conditions, the simultaneous determination of PAP and PAT is crucial. This work presents the fabrication of three-dimensional ZnCo 2 O 4 @Fe 3 O 4 /MWCNTs hybrid for the simultaneous determination of PAP and PAT using ZIF-8/67@Fe 3 O 4 as precursor and MWCNTs as conductive substrate. The ZnCo 2 O 4 @Fe 3 O 4 /MWCNTs/GCE sensor exhibits linear ranges 1.0–150.0 μM with detection limits of 0.033 μM and 0.018 μM for PAP and PAT, respectively. The developed sensor was successfully used for the determination of PAP and PAT in acetaminophen tablets and lake water with satisfactory results.
研究领域:
分析化学
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材料科学
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医学检测
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产品关联
DOI
高影响因子
ACS Omega
·
2024
·
IF 3.7
Weiming Gao,Dingwu Jiang,Yiming Zhang,Yao Li,Zhilong Xu,Runxi Han,Hao Tian,Hufei Dai,Qijing Lu,Cuiping Li
Detoxification of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) with high efficiency and dynamic performance is challenging for a polymeric catalyst. Herein, a series of conjugated microporous polyanilines (CMPAs), capable of efficiently catalytically reducing 4-NP, were synthesized based on the Buchwald–Hartwig cross-coupling reaction mechanism. By adjusting the types of linkers and the molar ratios of linker to core, CMPAs with different Brunauer–Emmett–Teller (BET) specific surface areas and reduction degrees were obtained and used as the catalysts in reducing 4-NP. The ultrahigh catalytic reduction efficiency (K = 141.32 s–1 g–1, kapp = 0.00353 s–1) was achieved when using CMPA-3-0.7 as the catalyst (prepared with 4,4′-diaminodiphenylamine as the linker and a 0.7:1 molar ratio of linker to core). The catalytic reduction performance exhibited a strong correlation with the reduction degree and BET specific surface area of CMPAs. Furthermore, they also exhibit excellent cycling stability and dynamic performance. The coexistence of a microporous structure and high BET specific surface area endowed CMPAs with an increased number of catalytic active centers. The reversible redox transformation of CMPAs in the presence of NaBH4 and air enabled self-healing (the oxidation units in CMPAs were reduced to reduction units by NaBH4, and the newly generated reduction unit in CMPAs was subsequently oxidized to its original state by the O2 in the air), leading to the reduction reaction of 4-NP proceeded continuously and stably. The aforementioned factors resulted in the high efficiency of CMPAs for reducing 4-NP to 4-AP, enhancing the practical application prospects of CMPAs in the detoxification of 4-NP wastewater.
研究领域:
材料科学
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环境科学
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催化化学
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产品关联
DOI
PubMed
高影响因子
ANALYST
·
2024
·
IF 3.6
Qingqing Liu,Aihua Qu,Chuanlai Xu,Xinxin Xu,Liqiang Liu,Hua Kuang
In this research, we used a novel hapten to generate a sensitive monoclonal antibody (mAb) 2C3 that targeted etomidate (ET) and metomidate (MT). We used this mAb to establish a lateral-flow immunoassay (LFIA) that incorporated fluorescent microsphere sensors, enabling both the qualitative and quantitative detection of ET and MT within 10 min. Analysis indicated that the visual colorimetric values for ET and MT in water samples were 0.3 µg/kg, respectively, with quantitative detection ranges of 0.08 to 1.31 µg/kg and 0.08 to 2.21 µg/kg, respectively. The visual colorimetric values for ET and MT in urine samples were 0.3 to 1 µg/kg, with quantitative detection ranges of 0.12 to 3.13 µg/kg and 0.09 to 2.98, respectively. The visual colorimetric values for ET and MT in serum samples were 3 µg/kg, with quantitative detection ranges of 0.15 to 21.2 µg/kg and 0.08 to 13.8 µg/kg, respectively. Recovery tests and detection were conducted in water, urine and serum samples, validating the reliability of this method in real clinical samples. Collectively, our novel LFIA provides a promising option for rapid on-site detection of ET and MT.
研究领域:
医学检测
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免疫学
·
分析化学
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产品关联
DOI
PubMed
高影响因子
COMPOSITES PART B-ENGINEERING
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2025
·
IF 14.2
Wenlong Hu,Lulu Yang,Shuzheng Zhang,Fuzheng Guo,Fangxin Wang,Shaohua Liu,Yu Cang,Bin Yang
Carbon fiber reinforced polymer composites (CFRPs) offer exceptional specific strength and lightweight characteristics due to the high-performance nature of carbon fiber. However, carbon fiber's chemical inertness results in weak interactions with the polymer matrix, which hinders the overall performance of the composites. Improving the interfacial properties has been a longstanding challenge in CFRPs development. Introducing nanomaterials along with chemical agents at the interface can enhance both physical and chemical interactions, facilitating better load transfer and more uniform stress distribution. Despite this, surface modification remains a complex process, and the lack of anchor bonds limits the effectiveness of chemical interactions. In this work, inspired by the crack-resistance mechanism of byssal cuticle through metal coordination bonds, we introduce a metal-phenolic network comprising ferric iron (Fe 3+ ) and tannic acid (TA) onto the carbon fiber surface using a simple one-pot deposition method. This approach significantly enhances the interfacial properties of the composite. The Fe 3+ -TA complex forms nano-sized aggregates on the fiber surface, with their morphology controllable by adjusting the precursor concentration and pH. The multiple reactive groups on TA allow for the incorporation of a silane coupling agent, effectively creating a chemical bridge between the carbon fiber and the matrix, further improving interfacial properties through synergistic chemical and physical interactions. This metal-phenolic network not only simultaneously strengthens and toughens the interface by promoting mechanical interlocking but also provides multiple chemical anchor sites to bridge the two components, offering new insights into strategies for interfacial strengthening and regulation.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2024
·
IF 1.3
Aiping Wang,Aihua Zhou,Jing Sui
In this work, an electrochemical sensor for simultaneous detection of hydroquinone (HQ) and catechol (CC) has been developed based on nanocomposite of Au nanoparticles (AuNPs) decorated poly(3,4-ethylenedioxythiophene) (PEDOT) nano-horns. AuNPs-PEDOT nanocomposite with a novel porous structure formed by lots of interconnected horn-like PEDOT has been facially prepared via a one-pot interfacial polymerization. The top and root-end diameters of horn-like PEDOT are around10 nm and 100 nm, respectively, while AuNPs with diameter ranging from 3 to 10 nm are evenly dispersed on PEDOT. The as-synthesized AuNPs-PEDOT nanocomposite modified glassy carbon electrode (GCE) exhibits high electrocatalytic property and excellent selectivity towards the redox reaction of HQ and CC. The AuNPs-PEDOT/GCE can simultaneously detect HQ and CC with detection limits (S/N = 3) of 0.38 µM and 0.43 µM for HQ and CC respectively. Moreover, the modified electrode has excellent selectivity and is successfully applied to detect HQ and CC in real tap water sample with recovery of 95.2–104.1% and 96.2–105.6%, respectively.
研究领域:
分析化学
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纳米材料科学
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环境监测
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产品关联
DOI
高影响因子
HIGH PERFORMANCE POLYMERS
·
2025
·
IF 1.6
Chenglong Tong,Xingdi Zhang,Jiyong Zhao,Heran Nie,Zhichao Wang,Zhipeng Wang
Poly (aryl ether ketone) (PAEK) plays a critical role in the production and application of special engineering plastics. However, the traditional PAEK has some limitations in processing, such as high melt viscosity and high energy consumption. This study successfully synthesized a series of PAEK copolymers with bisphenol A and phenolphthalein side groups through nucleophilic polycondensation, aiming to reduce the high energy consumption associated with material processing. By adjusting the ratio of bisphenol A to phenolphthalein side groups, this research explores their influence on the properties of the copolymers. Comprehensive characterization using various testing methods revealed that increasing the bisphenol A content led to a decrease in heat deflection temperature and glass transition temperature. Although mechanical performance showed a slight decline, it remained comparable to other advanced engineering materials. Notably, tuning the ratio of bisphenol A to phenolphthalein significantly improved the melt rheological properties of the copolymers, reducing melt viscosity, enhancing polymer chain flexibility, decreasing crosslinking tendencies, broadening the processing window, and lowering energy consumption. This study provides a novel strategy for tailoring the performance of PAEK copolymers, offering substantial potential for further research and application. These copolymers are good candidates for next-generation high-performance engineering plastics.
研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
CHEMOSPHERE
·
2017
·
IF 4.208
Dan Li,Hongxing Chen,Ran Bi,Haibo Xie,Yu Zhou,Yongju Luo,Lingtian Xie
In recent years, many new chemicals have been synthesized from biomass with an aim for sustainable development by replacing the existing toxic chemicals with those having similar properties and applications. However, the effects of these new chemicals on aquatic organisms remain relatively unknown. In this study, the effects of bisphenol A (BPA) and lignin-derived bisphenol (LD-BP, a BPA analogue) on Daphnia magna were evaluated. The animals were exposed to BPA, LD-BP, and their binary mixture at concentrations (2–2000 μg L −1 ) for 21 days. The expression of various biochemical markers and the effects on growth, molting, and reproduction parameters were examined. The results showed that the weight of daphnids significantly increased after exposure to BPA, LD-BP, and the binary mixture relative to that of the control animals. The activity of superoxide dismutase was significantly inhibited by LD-BP and the binary mixture. At the highest exposure concentration of the binary mixture, the activities of acetylcholinesterase and α-glucosidase, fecundity, and the number of neonates per brood were significantly altered. Our results showed that the effects of BPA and LD-BP on D. magna were generally comparable, except for the effect on the weight at their environmentally relevant concentrations (e.g., <20 μg L −1 ). The effects on the reproduction of D. magna could be mainly due to the shift in energy redistribution under BPA and LD-BP exposures. Our results implied that exposures to both BPA and LD-BP could potentially cause deleterious effects at the population level in D. magna .
研究领域:
环境科学
·
毒理学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 84
·80955-80963
·
IF 3.289
Tao Gong,Yehong Zhou,Linlin Sun,Wenting Liang,Jun Yang,Shaomin Shuang,Chuan Dong
β-Cyclodextrin polymer functionalized magnetic nanoparticles (CDP-MNPs) were prepared with a one-step co-precipitation method by anchoring a carboxymethyl-β-cyclodextrin polymer (CDP) onto the surface of Fe3O4 magnetic nanoparticles (MNPs). The CDP-MNPs possess the fascinating features of superparamagnetism and adsorption properties, which are favorable for the purpose of removing bisphenol A and resorcin. The maximum adsorption capacity for bisphenol A could reach values up to 74.63 mg g−1 at 25 °C, which is higher than those of previously reported magnetic adsorbents. Moreover, for the removal of resorcin by CDP-MNPs, the maximum uptake amounted to 114.91 mg g−1 under the same conditions. The adsorption kinetics and isotherm data fitted well with a pseudo-second-order kinetic model and the Langmuir isotherm, respectively. The CD polymer grafted onto the MNPs enhanced the adsorption capacity because of the host–guest interaction of cyclodextrin and the hydrogen bonding of the polymer network with the phenolic compounds. Additionally, a good recyclability of the CDP-MNPs was observed over three usage cycles, with only a slight decline in adsorption capability.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY
·
2018
·Vol. 37
·期 10
·2560-2565
·
IF 3.179
Dong Zhou
Because of increasing concerns about its toxic effects, bisphenol A (BPA) has been gradually replaced in industrial applications by analogs such as bisphenol S (BPS). Few comparative toxicity evaluations of bisphenol analogs have been done. In the present study, 72-h exposure in L1 larvae of the model animal Caenorhabditis elegans was used to evaluate low-concentration BPS toxicity. Multiple indicators at the physiological, biochemical, and molecular levels were tested. At the physiological level, BPS exposure resulted in significantly negative effects at treatments >1 µM, with head thrash being the most sensitive endpoint. At the biochemical level, BPS exposure induced no significant oxidative stress, but significantly increased apoptosis at 1 µM. At the molecular level, BPS exposure induced small but significant variations in most stress-related gene expressions at all doses. In addition, the transgenic nematode TJ375 cell line with the green fluorescent protein–based reporter hsp-16.2 was used to determine stress responses; it was found that TJ375 was not sensitive to BPS exposure. Compared with the effects of BPA shown in our previous 2016 study, the overall results showed that BPS was less noxious to C. elegans than BPA. These toxicity data for BPS could provide a foundation to evaluate the comparative toxicity of BPA alternatives. Environ Toxicol Chem 2018;37:2560–2565. © 2018 SETAC
研究领域:
环境毒理学
·
分子生物学
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生态学
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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）