FOOD CHEMISTRY
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2021
·
IF 7.514
Wenwen Deng,Anqi Huang,Qutong Zheng,Long Yu,Xiao Li,Hankun Hu,Yuxiu Xiao
A novel density-tunable liquid-phase microextraction (DT-LPME) system was developed with high-density deep eutectic solvents (DESs) as extractant and low-density organic solvents as emulsifier and density regulator. DES-rich phase was induced to form in the bottom or in the top by adjusting the emulsifier amount. This system was used to directly extract polycyclic aromatic hydrocarbons (PAHs) from liquid and solid foods, and the obtained DES-rich phase was easy to be collected for quantification. The method (LPME with HPLC-fluorescence detector) has linearity (R 2 > 0.9974), detection limits of 0.6–4.2 ng L -1 for liquid foods and 0.05–0.35 ng g −1 for solid foods, recoveries of 86.2–114.9%, and intra-day/inter-day RSDs below 6.6%. The method was applied to detect PAHs in real samples, and the PAHs residue was found in honey and five solid foods. The DT-LPME method is simple, fast, green and suitable for direct extraction of analytes from both liquid and solid samples.
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MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Chen Yu,Fengshou Wu,Xiaogang Luo,Juan Zhang
A porphyrin-based covalent organic framework (COF) was synthesized via a Schiff base reaction between tetra (4-aminophenyl) porphyrin and 4,4′-biphenyldicarboxaldehyde. The porphyrin-based COF was physically coated on stainless steel for headspace solid-phase microextraction (HS-SPME) of polycyclic aromatic hydrocarbons (PAHs) prior to their determination by gas chromatography-flame ionization detection (GC-FID). Some properties of the prepared fiber like morphology, structure and stability were tested. The effective parameters including extraction temperature, extraction time, NaCl concentration, agitation speed, desorption temperature and desorption time on the performance by HS-SPME were optimized systematically. The study of extraction mechanism revealed the π-π stacking interaction between porphyrin-based COF fiber and PAHs. Under optimum condition of the developed method, a wide linear range (1–150 ng mL −1 ) with high determination coefficient (R 2 > 0.99), low detection limit (0.25 ng mL −1 ) and low quantitation limit (0.5 ng mL −1 ) were obtained. The repeatability (one fiber, n = 3) and the reproducibility (fiber-to-fiber, n = 3) expressed as the relative standard deviations (RSDs) were in the range of 0.27%–1.75% (intra-day), 2.73%–6.69% (inter-day) and 3.34%–8.62% (fiber-to-fiber), respectively. The developed porphyrin-based COF HS-SPME method had been applied for the determination of PAHs in water and soil samples with satisfactory recoveries in the range of 67.87%–98.74%, 41.13%–104.76%, respectively.
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TALANTA
·
2021
·
IF 6.057
Xin-Qiao He,Yuan-Yuan Cui,Xiao-Hui Lin,Cheng-Xiong Yang
Development of novel functionalized adsorbents for efficient magnetic solid phase extraction (MSPE) is essential for promoting their versatile applications in sample pretreatment. Herein, we report the fabrication of a new polyethyleneimine-600 decorated magnetic microporous organic network nanosphere (Fe 3 O 4 @MON-PEI 600 ) for effective MSPE of trace non-steroidal anti-inflammatory drugs (NSAIDs) from different water samples. The core-shelled Fe 3 O 4 @MON-PEI 600 integrates the synergistic effects of Fe 3 O 4 , MON and PEI 600 , providing facile and effective extraction to NSAIDs via multiple hydrogen bonding , π-π and hydrophobic interactions. The inner MON shell employs π-π and hydrophobic interaction sites and the outer PEI-600 coat acts as the hydrogen bonding doner/receptor, which affords good extraction performance for NSAIDs. Under optimal conditions, the Fe 3 O 4 @MON-PEI 600 -MSPE-HPLC-UV method gives wide linear range (0.14–400 μg L −1 ), low limits of detection (0.042–0.149 μg L −1 ), good precisions (intra-day and inter-day RSDs < 4.5%, n = 6), and large enrichment factors (97.0–98.2). Extraction mechanisms and selectivity of Fe 3 O 4 @MON-PEI 600 are evaluated in detail. Moreover, Fe 3 O 4 @MON-PEI 600 is successfully applied to enrich the trace NSAIDs in different water samples with the concentrations of 0.7 and 0.8 μg L −1 for 1-naphthylacetic acid, 0.5 and 0.1 μg L −1 for naproxen as well as 0.7 μg L −1 for ibuprofen , respectively. The developed method not only affords a novel and efficient magnetic adsorbent for NSAIDs in aqueous media at trace level, but also provides a new strategy for the rational design and synthesis of multiple functionalized MON composites in sample pretreatment.
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JOURNAL OF POWER SOURCES
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2020
·
IF 8.247
Feng Wei,Xiaojun He,Honghui Bi,Shuai Jiao,Nan Xiao,Jieshan Qiu
3D hierarchical porous carbons with good electric conductivity and excellent physicochemical stability are of great potential as electrode materials for supercapacitors . Herein, we report a directing-confinement-template strategy for synthesis of 3D hierarchical carbons composed of cross-linked porous carbon nanosheets from fluorene molecules. The 3D cross-linked networks serve as highways for electron conduction while the multi-level pore structures function as channels for fast ion transport with abundant active sites for ion adsorption. Benefiting from the above merits, the hierarchical carbons manifest a high gravimetric capacitance of 344 F g −1 at 0.05 A g −1 , a superb rate capability with the capacitance up to 278 F g −1 even at 100 A g −1 and an outstanding cycle stability with only 0.7% decay after 50,000 cycles in alkaline electrolyte . Remarkably, hierarchical carbon-based capacitor displays a high energy density of 31.9 Wh kg −1 in 3 M ZnSO 4 neutral electrolyte owing to the wide voltage window of 2.2 V. This work opens up a new avenue for designing hierarchical carbons via directing and confinement template approach from small aromatic molecules for high-performance energy storage devices.
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JOURNAL OF CHROMATOGRAPHY A
·
2020
·
IF 4.049
Xiaohuan Zang,Yachao Pang,Hongda Li,Qingyun Chang,Shuaihua Zhang,Chun Wang,Zhi Wang
A covalent organic framework modified graphitic carbon nitride (g-C 3 N 4 @TpBD) was synthesized by modifying the graphitic carbon nitride (g-C 3 N 4 ) with a covalent organic framework (COF-TpBD). The synthesis conditions including the mass ratio between g-C 3 N 4 and benzidine (BD), solvent type, reaction temperature and reaction time were optimized. Under the optimal synthetic conditions, a novel spiny dendritic g-C 3 N 4 @TpBD adsorbent was obtained. The g-C 3 N 4 @TpBD was then coated on stainless-steel wire by sol-gel technique and the coated fiber was used for the solid phase microextraction of polycyclic aromatic hydrocarbons prior to gas chromatography-mass spectrometric detection. The established method was successfully applied to determine eight PAHs in six environmental water samples. Under the optimal extraction conditions, a wide linear quantification range for the analytes was obtained from 0.07 to 60.0 ng mL −1 with the coefficients of determination varying from 0.9979 to 0.9998, and the limits of detection (S/N = 3) ranged from 0.02 to 0.05 ng mL −1 . The relative recoveries of the analytes for the six environmental water samples at the spiked concentrations of 0.2, 0.5, 3.0 and 30.0 ng mL −1 were between 83.6% and 118% with the relative standard deviations ranging from 2.4% to 11.3%.
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Yunli Liu,Haiyang Hu,Giulio Zanaroli,Ping Xu,Hongzhi Tang
Polycyclic aromatic hydrocarbons (PAHs) and heterocyclic derivatives are organic pollutants that pose a serious health risk to human beings. In this study, a newly isolated Pseudomonas brassicacearum strain MPDS could effectively degrade PAHs and heterocyclic derivatives, including naphthalene , fluorene, dibenzofuran (DBF) and dibenzothiophene (DBT). Notably, strain MPDS is able to degrade fluorene, DBF and DBT uniquely via a lateral dioxygenation pathway, while most reported strains degrade fluorene, DBF and DBT via an angular dioxygenation pathway or co-metabolize them via a lateral dioxygenation pathway. Strain MPDS completely degraded 50 mg naphthalene (in 50 mL medium) in 84 h, and OD 600 reached 1.0–1.1; while, it stabilized at OD 600 0.5–0.6 with 5 mg fluorene or DBF or DBT. Meanwhile, 65.7% DBF and 32.1% DBT were degraded in 96 h, and 40.3% fluorene was degraded in 72 h, respectively. Through genomic and transcriptomic analyses, and comparative genomic analysis with another DBF degradation strain, relevant gene clusters were predicted, and a naphthalene-degrading gene cluster was identified. This study provides understanding of degradation of PAHs and their heterocyclic derivatives, as well as new insights into the lateral dioxygenation pathway of relevant contaminants.
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TALANTA
·
2020
·
IF 5.339
Zong-Da Du,Yuan-Yuan Cui,Cheng-Xiong Yang
Microporous organic networks (MONs) are a potential class of microporous materials in analytical chemistry . As great efforts have been made in sample pretreatment and gas chromatography, the application of MONs in high performance liquid chromatography (HPLC) has largely lagged and has never been investigated. In addition, directly packing of MONs into columns for HPLC is impractical due to the high column pressure and low column efficiency resulted from the sub-micron sized and irregular MONs. To solve these issues and uncover the possibility of MONs in HPLC, here we report the fabrication of spherical silica amino-functionalized MON (SiO 2 @MON-NH 2 ) composite as a novel stationary phase for HPLC. Neutral, acidic and alkaline probes were evaluated on SiO 2 @MON-NH 2 packed column. A column efficiency of 21,246 plates per meter was obtained for n -propylbenzene. The results revealed the hydrophobic interaction was the main separation mechanism on SiO 2 @MON-NH 2 packed column. Baseline separation of benzenediol , dichlorophenol , chlorophenol and phenylenediamine position isomers, deoxynucleosides and nucleosides was also achieved on SiO 2 @MON-NH 2 packed column. The relative standard deviations of retention time, peak height and peak area for the studied position isomers, deoxynucleosides and nucleosides were 0.2–0.7%, 0.3–3.7% and 1.7–3.5%, respectively. The SiO 2 @MON-NH 2 packed column also offered better resolution for dichlorophenol isomers, deoxynucleosides and nucleosides than SiO 2 –NH 2 and commercial C18 columns. These results revealed the potential of MONs in HPLC and also provided a new way for the use of nano-sized or irregular MONs in HPLC.
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JOURNAL OF SEPARATION SCIENCE
·
2020
·Vol. 43
·期 18
·3655-3664
·
IF 2.878
Herman Maloko Loussala,Sen Han,Juanjuan Feng,Min Sun,Jiaqing Feng,Jing Fan,Meishan Pei
To enhance the extraction performance, a mesoporous silica was modified with ordered mesoporous carbon for solid-phase microextraction. Three stainless-steel wires coated with the mesoporous material were placed in a polyetheretherketone tube for getting an extraction tube. The tube was coupled to high-performance liquid chromatography with diode array detector, and the online analysis system was constructed. Then its extraction performance was evaluated using hydrophobic polycyclic aromatic hydrocarbons, phthalates, and hydrophilic neonicotinoids. The best selectivity was presented for polycyclic aromatic hydrocarbons. Several main conditions were optimized such as sampling volume, sampling rate, methanol concentration in the sample, and desorption time, a rapid and sensitive analytical method was established toward polycyclic aromatic hydrocarbons. The analytical method exhibited wide linear range from 0.017 to 15 µg/L with acceptable correlation coefficients more than 0.9990, limits of detection in 0.005-0.020 µg/L, limits of quantification ranging from 0.017 to 0.066 µg/L as well as large enrichment factors of 377-2314. It was successfully applied to detect trace polycyclic aromatic hydrocarbons in some real water samples including tap water, snow water, and domestic sewage.
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FOOD CHEMISTRY
·
2020
·
IF 6.306
Wenjin Wang,Shuaihua Zhang,Zhi Li,Jinqiu Li,Xiumin Yang,Chun Wang,Zhi Wang
Honey, a highly nutritious functional food, might be contaminated by polycyclic aromatic hydrocarbons (PAHs) during its production and/or harvest. The preconcentration and analysis of trace levels of PAHs from the complex sample matrices like honey still poses challenges for analytical researchers. In this study, three different covalent triazine-based frameworks (CTFs) were synthesized and explored as the solid-phase microextraction (SPME) coating for the extraction of some PAHs from various honey samples. Among the CTFs, cyanuric chloride- p -quaterphenyl (CC-QP) exhibited the highest extraction capability toward PAHs due to its largest specific surface area and π-electrons system. Under the optimum experimental conditions, the CC-QP based SPME method exhibited wide linearity (0.10–100 ng g −1 ), low limits of detection (0.03–0.19 ng g −1 ) and good reproducibility (relative standard deviations < 9.9%). The new SPME method coupled with chromatography-mass spectrometry detection was successfully applied for the determination of PAHs in honey samples with satisfactory recoveries (82.0–116.8%).
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GEOMICROBIOLOGY JOURNAL
·
2020
·
IF 1.989
Xin Hu,Yue Qiao,Long-Qiang Chen,Jian-Fei Du,Yue-Yue Fu,Si Wu,Lei Huang
The demand to repair areas contaminated with hydrocarbon products has led to the development of new technologies for the treatment of contaminants in an unconventional method, that is, no physical or chemical methods are used. Biosurfactants are amphiphilic biomolecules produced by microorganisms that can be used in environments contaminated by petroleum products due to their unexceptionable tensile properties. Petroleum degrading strain Rhodococcus erythropolis HX-2 was found to be an effective producer of biosurfactants. The resulting biosurfactant (named NK) exhibits high physicochemical properties in terms of surface activity. It is capable of reducing surface tension from 54.99 to 28.89 mN/m and critical micelle concentration (CMC) is 100 mg/L. NK was found to be a substitute for chemically synthesized surfactants because of its higher solubilization efficiency for petroleum and polycyclic aromatic hydrocarbons, superior to SDS, Tween 80, Triton X-100 and Rhamnolipid (a wide used biosurfactant). In addition, it exhibits favorable emulsion stability over a wide range of pH (3–10), temperature (20–100 °C) and salinity ranges (5–20 g/L). It was found that the addition of biosurfactant can improve the efficiency of petroleum degradation, therefore it has potential applications in bioremediation.HighlightsRhodococcus erythropolis HX-2 is an effective petroleum degrading strain.HX-2 is a potential source of biosurfactant production.The biosurfactant NK reduces surface tension and exhibits high emulsification activity.The biosurfactant NK is effective over a wide range of temperatures, pH and salinity.The biosurfactant NK shows high solubilization efficiency for petroleum as well as polycyclic aromatic hydrocarbons.
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JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Lige Zhang,Xiaoyu Qiu,Ling Huang,Jijun Xu,Weiwei Wang,Zhao Li,Ping Xu,Hongzhi Tang
Polycyclic aromatic hydrocarbons (PAHs) are widely distributed in the environment and pose a serious threat to human health. Due to their unfavorable biological effects and persistent properties, it is extremely urgent to effectively degrade PAHs that are present in the environment, especially in wastewater. In this study, we obtained an efficient bacterial consortium (PDMC), consisting of the genera Sphingobium (58.57−72.40%) and Pseudomonas (25.93−39.75%), which is able to efficiently utilize phenanthrene or dibenzothiophene as the sole carbon source. The phenanthrene-cultivated consortium could also degrade naphthalene , acenaphthene, fluorene, anthracene , fluoranthene , benzo[ a ]anthracene, dibenzofuran , carbazole and indole , respectively. Furthermore, we identified the multiple key intermediates of aforementioned 11 substrates and discussed proposed pathways involved. Notably, a novel intermediate 1,2-dihydroxy-4a,9a-dihydroanthracene-9,10-dione of anthracene degradation was detected, which is extremely rare compared to previous reports. The PDMC consortium removed 100% of PAHs within 5 days in the small-scale wastewater bioremediation added with PAHs mixture, with a sludge settling velocity of 5% after 10 days of incubation. Experiments on the stability reveal the PDMC consortium always has excellent degrading ability for totaling 24 days. Combined with the microbial diversity analysis, the results suggest the PDMC consortium is a promising candidate to facilitate the bioremediation of PAHs-contaminated environments.
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JOURNAL OF CHROMATOGRAPHY A
·
2021
·
IF 4.759
Jinqiu Li,Bin Zhao,Liying Guo,Zhuo Wang,Chun Wang,Zhi Wang,Shuaihua Zhang,Qiuhua Wu
Three novel hypercrosslinked polymers (HCPs) were synthesized via Friedel-Crafts reaction employing 1,3,5-tris(bromomethyl)-2,4,6-trimethylbenzene as alkylating agent, and triphenylbenzene, tetraphenylethylene and p -quaterphenyl as the aromatic units, respectively. The prepared HCPs were applied as solid-phase microextraction coatings for direct immersion extraction of polycyclic aromatic hydrocarbons (PAHs) and their oxygenated and nitrated derivatives in environmental water samples. The key factors affecting the extraction efficiency including extraction time, extraction temperature, stirring rate, ionic strength and desorption conditions, were carefully studied. Coupled with gas chromatography mass spectrometry analysis, a new method for determining PAHs and their derivatives was developed. Under the optimized conditions, the limits of detection ( S/N =3) and limits of quantitation (the lowest concentration for quantification) of the method were in the range of 2.5-25.0 and 7.5-75.0 ng L −1 , respectively. The recoveries of spiked samples were in the range of 73.1-118.3% with relative standard deviations less than 13.0%. The developed method was applied for the simultaneous determination of nine PAHs and their derivatives in environmental water samples, showing good accuracy and reliability.
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