JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
·
2014
·Vol. 25
·期 8
·1512-1519
·
IF 1.253
Li Yingtang,Yang Guorong,Zhao Jiao,Yang Yaling
In this study, a vortex-assisted three-phase hollow fiber liquid-phase microextraction (VA-HF-LPME) coupling with high performance liquid chromatography (HPLC) method was developed for determination of three synthetic endocrine disrupting compounds[EDCs, bisphenol-A (BPA), bisphenol-AF (BPAF) and tetrabromobisphenol-A (TBBPA)] in milk samples. Vortex provided effective and mild mixing of the sample solution and increased the contact between analytes and boundary layers of the hollow fibre, thereby enhancing mass transfer rate and leading to high extraction efficiency of the target analytes. The influencing parameters of VA-HF-LPME sample preparation method, such as organic solvents (acceptor phase), pH of sample solution (donor phase), sample volume, concentration of NaOH, extraction time, and ionic strength were systematically optimized. The instrumental calibration curves of BPA, BPAF and TBBPA show good linear relations (R² > 0.9988) in the concentration range of 0.5-200, 0.5-200 and 1.0-250 µg L-1, respectively. The relative standard deviations (RSD, n = 5) were 1.3-3.7%. The limits of detection (LOD, S/N = 3) were in the range of 0.16-0.35 µg L-1 and the limits of quantification (LOQ, S/N = 10) were in the range of 0.51-1.12 µg L-1. The proposed method was successfully applied to the extraction of EDCs in milk samples.
研究领域:
分析化学
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环境科学
·
食品安全
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DOI
高影响因子
ENVIRONMENTAL MONITORING AND ASSESSMENT
·
2025
·Vol. 197
·期 8
·1-13
·
IF 3
Luo Huili,Pan Xiaopeng,Yang Yixuan,Huang Yilu,Xiang Yuhang,Li Anxin,Zhao Jia
Bisphenol analogues (BPs), the endocrine-disrupting compounds, have been detected in water, sediment, and even agricultural products. Irrigation is the main way for material migration, and it has been suggested as one of the sources of BPs. But the attention to irrigation water and sediment, and further to the ecological risks, is rare. In a hilly irrigation area in southern China, the partition and accumulation, contribution sources, and potential ecological risk of four bisphenols (BPA, bisphenol S, F, and AF) in the irrigation canal were investigated in the spring of 2023 and 2024. All four BPs were detected in the irrigation water and sediment. BPF was the dominant of 19.6–60.9 ng/L in water, while BPA was still the prominent compound (46.2–54.4% of ∑BPs) in sediment. BPs in the irrigation canal were related to the direct discharge of aquaculture, domestic, and planting drainage. Although low risks for each compound, the comprehensive risk (∑RQ) of sediments went into medium risk. BPF and BPA were the main risk contributors. BPs in sediments increased steadily during the investigation. The special accumulative point was where slow flow maintained, especially caused by the hilly change. This comprehensive study of BPs in hilly irrigation canals should be valuable for reference in similar areas. And it will be beneficial for environmental protection and production safety.
研究领域:
环境科学
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水污染研究
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生态毒理学
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农业环境管理
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内分泌干扰物
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DOI
PubMed
高影响因子
Food Bioscience
·
2022
·
IF 5.318
Gui-Li Huang,Tian-Tian Liu,Jia-Jia Ma,Ling-Xiang Sun,Si-Yao Sui,Xin-Yao Quan,Yu-Ning Wang
The harvested loquat fruits are prone to browning, leading to a decline in fruit quality. Inhibiting activity of polyphenol oxidase (PPO) is an important way to prevent browning. In this study, we evaluated the inhibitory impact of oligomeric procyanidins (OPC) on hydroxylation of monophenol and oxidation of o-diphenol catalyzed by PPO and effect of OPC on loquat fruits storage . The obtained results revealed that OPC could attenuate the activity of monophenolase and diphenolase. For monophenolase activity, the inhibition rate was observed to be dose-dependent with an IC 50 of 11.6 ± 3.4 μg/mL for the steady-state rate. For diphenolase activity, OPC inhibited PPO activity ( IC 50 = 15.75 ± 2.1 μg/mL) with a reversible and competitive mechanism and quenched fluorescence of PPO by forming OPC-PPO complex with one binding site in a static procedure. In addition, the data obtained from storage assays revealed that OPC could enhance the quality of harvested loquat fruits by attenuating the PPO activity, augmenting the content of total phenolics and flavonoids , and simultaneously delaying the browning of loquats. In this research, we identified a potent PPO inhibitor and expanded its potential as a food preservative.
研究领域:
食品科学
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植物生理学
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采后技术
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DOI
高影响因子
Analytical Methods
·
2025
·
IF 2.6
Zuhang Ding,Jianzheng Wang,Jing Jin,Min-jie Guo,Qinran Li,Zhi Fan,Jin Zhao
This research describes a novel electrochemical sensor based on a polyimide-silver nanowire (PI-AgNWs) composite that is used to modify a glassy carbon electrode (GCE) for the simultaneous detection of multiple nitrophenol isomers (NPs) with high performance. The synergistic effect from polyimide (PI) doped silver nanowires (AgNWs) improved the selectivity and sensitivity of the fabricated sensor. First, the AgNWs was prepared by polyol process, and then composited with PI to obtain the target composite. Subsequently, the composite was characterized in detail and was used to modify GCE for the NPs detection. Afterwards, electrochemical measurements were performed to simultaneous detection for three NPs. Under the optimal condition, the results exhibited that the linear detection range of 1-400 μM for 4-nitrophenol (4-NP), 1-350 μM for both 2-nitrophenol (2-NP) and 3-nitrophenol (3-NP) and the limit of detection (LOD) were 0.081 μM for 2-NP, 0.107 μM for 3-NP, and 0.063 μM for 4-NP, respectively. In addition, the fabricated electrode exhibited excellent reproducibility (RSDs of 2.85% for 2-NP, 2.71% for 3-NP, and 1.80% for 4-NP, respectively) and stability (RSDs of 6.17% for 2-NP, 2.36% for 3-NP, and 3.89% for 4-NP, respectively) over multiple measurements. Moreover, the sensor showed excellent anti-interference capability and was successfully applied to detect NPs analytes in real water samples with recoveries ranging from 91.1% to 109.0%. This study emphasizes the potential application of PI-AgNWs composites for the rapid detection of NPs in the environment.
研究领域:
分析化学
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环境监测
·
纳米材料
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电化学传感
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污染物检测
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 6
·B547
·
IF 3.12
Siyi Yang,Mei Yang,Qingyan Liu,Xiaojing Wang,Huanbao Fa,Yongzhong Wang,Changjun Hou
Three dihydroxybenzene isomers, hydroquinone (HQ), catechol (CC) and resorcinol (RS), were determined simultaneously by an ultrasensitive electrochemical sensor based on a glassy carbon electrode modified by multiwalled carbon nanotube@reduced graphene oxide nanoribbon (MWCNT@rGONR) composite. The material was synthesized via hydrothermal method and characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD). We used cyclic voltammetry (CV) to study the electrochemical performance of the three isomers and differential pulse voltammetry (DPV) to optimize the experimental parameters. Based on the optimal experimental condition, our electrochemical sensor displayed a good linear relationship with the concentration range of 15 to 921 μM, 15 to 1101 μM, and 15 to 1301 μM and detection limit of 3.89 μM, 1.73 μM and 5.77 μM for HQ, CC and RS respectively. The electrochemical sensor based on MWCNT@GONR composite showed outstanding ability of reproducibility, stability and anti-interference. In addition, this sensor was also used successfully for simultaneous determination of HQ, CC and RS in real samples with satisfactory result.
研究领域:
分析化学
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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
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 36
·16107-16118
·
IF 2.7
Zhoufeng Wang,Bolin Wang,Yingying Liu,Xiubo Long,Wenlong Yao
A series of linear block polymers and random polymers were synthesized by interfacial polycondensation using two bisphenols with similar structures, bisphenol S (BPS) and bisphenol A (BPA), and terephthaloyl chloride and isophthaloyl chloride. Random polymers and block polymers with the expected topology were structurally characterized by 1H NMR, FTIR, GPC, WAXD, and Raman spectroscopy. The results demonstrated that there was no significant difference in the thermal stability of the block and random polyarylates, which was due to the fact that the covalent bonds of the linked monomers did not change substantially, and the bond energies were the same. However, due to the alteration of the molecular sequence structure, the block polymer exhibited a lower glass transition temperature, a pronounced melting peak, and better solubility. With physical cross-linking points consisting of microcrystalline phases formed by the relatively regular molecular chain structure, the block polyarylates exhibited a higher modulus of elasticity than the random polyarylates. This illustrated that it is possible to prepare new functional polyarylates without changing the monomer composition, but only by manipulating the reaction process.
研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Xianjie Wang,Long Yan,Yufei Wang,Shuaige Shi,Jian Li,Xiaoyong Fan
While phenolic porous carbons (PPCs) are commonly synthesized from single phenols, the impact of mixed phenols and ammonia on pore structure formation has yet to be fully elucidated. In this study, phenolic and ammonia components from semi-coking wastewater were used to prepare high-performance porous carbon, activated by sodium-based agents. Response surface methodology (RSM) identified optimal conditions—Na 2 CO 3 -to-resin ratio of 2.13:1, carbonization temperature of 784 °C, and activation time of 1.52 h—yielding an iodine adsorption capacity of 1046.36 mg/g. XPS analysis showed that Na 2 CO 3 activation resulted in higher retention of nitrogen, oxygen, and sulfur compared to KOH activation. This is attributed to the gentler etching effect of Na 2 CO 3 , which facilitated the formation of larger mesopores and macropores. Thermal and kinetic analysis revealed lower activation energies for Na 2 CO 3 -activated resins, especially when mixed phenols and ammonia were used as precursors. SEM and BET analysis confirmed the presence of a hierarchical pore structure. Additionally, ammonia was found to enhance pore formation, resulting in smoother and more uniform pores. These findings demonstrate the feasibility of using semi-coking wastewater as a precursor for producing sustainable porous carbon materials, offering potential applications in both environmental remediation and energy storage.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
International Journal of Environmental Research and Public Health
·
2019
·Vol. 16
·期 21
·4100
·
IF 2.468
Qi Chen,Yu Lan,Jian Shi,Weijie Liu,Bo Zhu,Dong Sun,Shunshan Duan
Sediment cores were collected from four outlets in the Pearl River Estuary (Guangdong Province, China) and dated using the210Pb method to investigate the pollution history of the area due to its relatively stable sedimentation status and hydrographic conditions in recent decades. The ages of the sediment cores were dated over 40 years (1968–2015). The concentrations at the four outlets ranged from 2.21 to 48.52 ng g−1dw for nonylphenol and were non-detectable for 23.64 ng g−1dw for bisphenol A (BPA), which exhibited a decreasing trend from north to south as well as seaward. The fluxes (2.84 to 112.91 ng cm−2yr−1and non-detectable to 59.33 ng cm−2yr−1for nonylphenol and bisphenol A, respectively) stabilized in the 1980s to 1990s due to the construction of sewage treatment systems. The fluxes increased again in the 21st century, which reached a peak ca. 2010 but declined in recent years due to the establishment of regulations and the decreasing number of industrial enterprises. Fluctuations in the pollution composition coincided with industrial development and governmental policies.Keywords:nonylphenol;bisphenol A;dry mass sedimentation rates;historical trends;Pearl River Estuary
研究领域:
环境科学
·
生态学
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DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Shuangyu Xiong,Luminita Marin,Lian Duan,Xinjian Cheng
Nitroaromatic compounds, especially 2, 4, 6-trinitrophenol, have strong biological toxicity and explosive risks, so the detection of 2, 4, 6-trinitrophenol exhibit importantly practical and scientific significance. In this work, three fluorescence functionalized chitosan CNS 3 , CNS 4 and CNS 5 were prepared using chitosan as matrix. When 2, 4, 6-trinitrophenol (TNP) and/or p-nitrophenol (4-NP) was present in spot, these fluorescent chitosan sensors produced notable fluorescence quenching. It renders the chitosan sensing ability to detect TNP and 4-NP selectively and sensitively. The sensing mechanism is investigated as well. When introduced electron-rich moieties to the fluorescent chitosan, the sensitive detecting ability could be obtained. Excellent recognition ability could reach as low as 0.28 μM. The fluorescence fictionalization cause slight influence to the gel performance of chitosan.
研究领域:
分析化学
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环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2019
·
IF 6.395
Hongran Zhao,Jianxiang Feng,Jin Zhu,Haibin Yu,Yuejun Liu,Pu Shi,Shengpei Wang,Shenggao Liu
3 The greatest challenge of vegetable oils (VOs) used as green lubricants is their oxidation stability. The potential of incorporating sustainable components to VOs as high efficient antioxidant additives can be beneficial to both energy conservation and environment protection. In this paper, bio-based multifunctional additives (BMAs) were specially designed and synthesized with the aim of maximizing VOs’ oxidation stability by combining biophenols (gallic acid, caffeic acid and p-hydroxycinnamic acid) with 4-aminodiphenylamine in one molecular. The BMAs were found to have extraordinary higher thermal stability and free radical scavenging activity than that of commercial antioxidants. BMAs were evaluated as multifunctional additives in VOs. Pressure differential scanning calorimetry (PDSC) indicated that the oxidation induction time (OIT) of rapeseed oil (RO), coconut oil (CO) and epoxy soybean oil (ESO) can be increased correspondingly by about 2.2, 14.0 and 32.0 times with the addition of BMAs. Four ball test showed that bio-based multifunctional additives 3 (BMA3) had the best antiwear activities among three BMAs (18% decrease in RO), better than traditional zinc dialkyl dithiophosphate (ZDDP) in CO and ESO. In a comparison to commercial phenol, arylamine antioxidants and their physical mixtures, BMAs demonstrated superior antioxidant properties with the increase of phenol hydroxyl group, which mostly benefit from the polyphenolic and aryl amine intramolecular synergism.
研究领域:
化学工程
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环境科学
·
材料科学
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DOI
高影响因子
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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DOI
高影响因子
MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 3
·951-959
·
IF 4.58
Zhang Yuhuan,Wang Yanru,Zhu Wenxin,Wang Jing,Yue Xiaoyue,Liu Wei,Zhang Daohong,Wang Jianlong
The capability of multi-level logic operations in biological diagnosis is far from being fully realized. In particular, the simplification of logic judgments to realize rapid, on-site complex diagnoses is still a key issue in bioelectronics. The authors here describe the construction of a colorimetric multilevel DNA circuit that incorporates two IMPLY gates and a sample extraction technology (SET) with anti-BPA aptamer as a co-recognizing element and the color of gold nanoparticles as the output signal. The circuit can perform multi-bioanalysis of the plasticizers and hormone mimetics bisphenol A (BPA) and bisphenol S (BPS). The assay is based on the finding that the aptamer against BPA can recognize both BPA and BPS. This DNA logic detection system is simple, fast, sensitive and selective because of the utilization of a co-recognition element which decreased input numbers. This, in turn, cascades multiplex Boolean logic gates and simplifies the diagnostic challenge. Both BPA and BPS can be determined by photometry at 620 nm, the limit of detection being 1.5 ng⋅mL −1 for BPA and 1.3 ng⋅mL −1 for BPS. Application to (spiked) water samples shows good analytical performance in terms of recovery (95.4 to 106.8%), linear range (4.4 to 66 ng⋅mL −1 for BPA, 2.5 to 75 ng⋅mL −1 for BPS) and correlation coefficients (>0.98). In our perception, the method represents a simple route for the fabrication of colorimetric multi-level DNA circuits. It may shorten the gap between bioelectronic logic circuits and high throughput real sample analysis.
Illustration of sample extraction treatments (SET) of bisphenol A (BPA) and bisphenol S (BPS) and the three-input IMPLY1-IMPLY2 logic operation with BPA, BPS and anti-BPA aptamer as inputs.
研究领域:
生物化学
·
分析化学
·
生物医学工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）