Journal of Environmental Chemical Engineering
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2021
·Vol. 9
·期 4
·105785
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IF 5.909
Jinjia Guo,Yongmei Wang,Zhao Luo,Feng Zhang,Dewang Yang
Carbon cycle in coastal water is a significant dynamic component of global carbon budget , however, the diverse sources, carbon sinks and their complex interactions remained poorly understood. In order to detect the dissolved inorganic carbon (DIC) and their interactions, gas-liquid Raman spectroscopy was built and applied to simultaneously detect the constituents of air, dissolved CO 2 , HCO 3 - and chlorophyll in coastal water. The linear fitting curve between peak intensity and concentration was built for the quantitative analysis of HCO 3 - and CO 2 , meanwhile, the fluorescence peaks of chlorophyll at 679 nm were detected for the qualitative analysis. For the multi-components analysis, typical Raman spectra of the constituents of air, dissolved CO 2 , HCO 3 - in seawater, and the fluorescence spectra of chlorophyll in seawater were detected. Results showed that the time dependent change of CO 2 and O 2 in the air exhibited a contrary tendency, while that of dissolved CO 2 and O 2 was curved like a cosine. The changing tendency of relative concentrations of dissolved CO 2 was about 2 h earlier than CO 2 in air, due to the life activity of microorganisms driving the gas exchange at the air-sea interface. Furthermore, the study makes a study on the relationship between DIC and chlorophyll based on the detection of HCO 3 - and chlorophyll in coastal water, indicating that this gas-liquid Raman spectroscopy could successfully provide real-time analysis of multicomponent DIC in the air-sea exchanging process.
研究领域:
海洋化学
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环境光谱学
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碳循环
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分析化学
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生物地球化学
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DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2021
·
IF 4.098
Bicheng Liu,Liangming Wu,Zoujun Peng,Sihao Wu,Ping Qiu
A colorimetric gold nanoparticles (AuNPs)-based acetylcholinesterase (AChE) assay was designed for the first time to measure the concentration of parathion-methyl (PM) in lake water samples. In this assay, the analyte PM inhibited the hydrolysis of acetylthiocholine (ATCh) by AChE, preventing the formation of thiocholine (TCh) that would otherwise react with the AuNPs catalyst and deactivate the catalyst. Therefore, in the presence of PM, the AuNPs catalyzed the oxidation of the 3,3′,5,5′-tetramethylbenzidine (TMB) colorimetric indicator to oxTMB, inducing a visual color change from colorless to blue. However, in the absence of PM, AChE hydrolyzed ATCh to TCh, which then reacted with the AuNPs, preventing the oxidation of TMB to oxTMB and rendering the solution colorless. Therefore, the change in the color of the analyte solution indicated the presence of PM, and the absorbance of the resulting solution was measured by UV–Vis spectroscopy to calculate the concentration of PM after generation of a calibration curve. This method was then employed using the smartphone app Color Picker, which converted the color information from the photos of the solution into digital red (R), green (G), and blue (B) values. The ratio of green (G) to blue (B) (G/B) was then plotted against the corresponding concentration to calculate the standard curve, whose regression equation was expressed by y = –0.012x + 1.02 (ng/mL), and the coefficient of determination (R 2 ) was 0.97. In addition, this method was also used to determine the amount of PM in real lake water samples with recovery of 90.2–133.3%.
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DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Shuwei Zhou,Qiong Wu,Qiaoxia Wang,Hong Fu,Fang Yang
Pigments and organic acids are among the most common impurities in complex sample matrices. Their presence in the samples often interferes with the detection of trace analytes. This study aimed to design and develop magnetic materials (GCB/Fe 3 O 4 -PSA) for the efficient purification of organic acids and pigment impurities in sample matrices. We employed the acid modification method to enhance the modification of magnetic Fe 3 O 4 by the primary secondary amine adsorption group (PSA), effectively boosting its adsorption performance. This modification technique not only retains the inherent adsorption characteristics of Fe 3 O 4 but also avoids the irreversible damage to Fe 3 O 4 ′s own adsorption by traditional grafting methods. Subsequently, Fe 3 O 4 -PSA and graphitized carbon black (GCB) were combined through a simple physical assembly method to prepare GCB/Fe 3 O 4 -PSA, which was used for the purification of pigments and organic acids in complex matrices. During the purification process, GCB/Fe 3 O 4 -PSA can be rapidly magnetically separated. After six reuses, the adsorption performance remains above 80 %, fully demonstrating the rapid purification ability and reusability potential of GCB/Fe 3 O 4 -PSA. Compared with unmodified Fe 3 O 4 , GCB/Fe 3 O 4 -PSA significantly enhanced the purification effect of complex matrices. Its adsorption capacities for chlorophyll and ascorbic acid increased by 276.9 % and 263.9 % respectively. After combining with the GCB/Fe 3 O 4 -PSA purification material, cathinones in complex matrix samples (tea, apples, carrots) were determined using UPLC-MS/MS. The recoveries in spiked samples ranged from 96.35 % to 104.17 %, with the RSDs < 3.02 %. Simultaneously, characterization methods such as SEM, FTIR, XRD, VSM, XPS, and BET were used to study the surface structure and chemical composition of GCB/Fe 3 O 4 -PSA. The above results highlight the outstanding performance of GCB/Fe 3 O 4 -PSA in the efficient purification of organic acids and pigments in complex matrices and also show its considerable application potential in the pretreatment of complex matrix samples.
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高影响因子
FOOD CHEMISTRY
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2025
·
IF 9.8
Zi-Ling Li,Xiao-Run Qi,Yi-Heng Xu,Jia-Qi Zhao,Gui-Fu Zuo,Man-Man Wang
Effective and convenient QuEChERS of lipophilic pesticides with wide p K a range from strongly pigment-rich food samples remains a great challenge. Here, ZIF-67 derived magnetic nanoporous carbon (Co@MPC) was firstly proposed for modified QuEChERS of carbamate pesticides ( pK a 4.3–12.3) in various vegetable and fruit samples prior to LC-MS/MS. This sorbent offered superior adsorption capacities of 29.89 mg/g and 22.28 mg/g towards chlorophyll and lutein via π-π and hydrophobic interactions. The present method exhibited acceptable matrix effect of −4.8 %-14.4 %, low detection limits of 0.003–0.02 μg/kg and satisfactory recoveries of 80.2 %–108 % in celery, cabbage, Chinese cabbage, apple, banana and orange samples. 10 mg of Co@MPC enabled highly efficient matrix purification and isolation in 20 s, offering low-cost and facile clean-up process. The study highlighted great potential of Co@MPC as QuEChERS sorbent, and demonstrated its wide applicability and broad application prospects to monitor the contaminants in food items.
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Haoran Wang,Wei Ji,Feng Xiao,Yewen Xiao,Linlin Li,Xia Shu,Hualin Wang,Jun Yin
Over-ripening and spoilage of fruits, driven by excessive ethylene (C 2 H 4 ) production and microbial proliferation, present critical challenges in fruit postharvest preservation. Herein, a multifunctional photocatalytic film, CTC-Arg@CS/HPMC, is developed by incorporating chlorophyll-TiO 2 @carbon sphere (CTC) photocatalyst and L-arginine (Arg) NO donor into chitosan/hydroxypropyl methylcellulose (CS/HPMC) matrix for banana preservation. The distinctive dual heterojunction structure of CTC enhances photocatalytic activity under visible light, promoting reactive oxygen species (ROS) generation that triggers NO release from Arg. Under combined action of ROS and NO, CTC-Arg@CS/HPMC can not only inactivate bacteria with high antibacterial efficiency against Escherichia coli (93 ± 3 %) and Staphylococcus aureus (99 ± 2 %) within 60 min but also delay fruit ripening through C 2 H 4 degradation and inhibition of biosynthesis. In practical application scenario, CTC-Arg@CS/HPMC can effectively extend banana shelf-life by over 100 % at 25 °C, highlighting its potential as an active packaging material for extending the postharvest life of climacteric fruits.
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高影响因子
Journal of Cleaner Production
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2025
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IF 10
Shanshan Zhang,Zhongyang Wang,Shengchao Zhao,Siheng Zhao,Q. Jason Niu,Mingfu Wang
This research aimed to develop a high-performance organic solvent nanofiltration (OSN) membrane using porous organic cage Noria and nonplanar molecules to separate low-polarity bioactive components from a representative herbal extract and remove pigments like chlorophylls. The OSN membranes were fabricated and further modified via interfacial polymerization on polysulfone (PSF) ultrafiltration substrates. Among the fabricated membranes, the OSN-10 membrane, prepared by interfacial polymerization of Noria and cyclohexane-1,3,5-tricarbonyl chloride (HTC), demonstrated noteworthy performance. It demonstrated high solvent permeance of both methanol (29.28 L m −2 h −1 bar −1 ) and ethanol (16.98 L m −2 h −1 bar −1 ). Importantly, a bioactive stilbene, cajaninstilbene acid (CSA), was successfully enriched from pigeon pea leaf extracts using OSN-10 membrane while maintaining a high chlorophyll rejection rate of over 90 %. The Noria-based OSN-10 membrane developed in this work exhibited impressive organic solvent permeability and an optimal molecular weight cut-off, making it highly suitable for CSA separation. Overall, the OSN-10 membrane demonstrated excellent separation performance, remarkable chlorophyll rejection rate, and significant potential for application in low-polarity natural product separation. Also, the membrane process significantly reduces the use of organic solvents, simplifies isolation and purification, and offers cost advantages with industrialization potential compared to traditional solvent extraction methods.
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高影响因子
危险品化学品经营许可证（带存储）