Analytical Methods
·
2019
·Vol. 12
·期 4
·507-513
·
IF 2.378
Yinpeng Yang,Yuan Sun,Hang Chen,Xueping Dang,Youhong Ai,Xiaolan Liu,Huaixia Chen
Novel mesoporous yolk–shell structure magnetic molecularly imprinted polymers (MYS-MMIPs) were synthesized via surface polymerization using E2 as a template followed by chemical selective etching to remove the inorganic silica interlayer for the rapid, selective extraction and sensitive detection of 17β-estradiol (E2) in milk powder. For MYS-MMIPs, transmission electron microscopy coupled with N2 adsorption experiments confirmed the successful formation of a mesoporous yolk–shell structure. Furthermore, the thermogravimetric and recycling experiments showed the good thermal and adsorption stability of MYS-MMIPs, the magnetic properties experiment confirmed their good magnetic response, and the binding experiment indicated their selective recognition and high binding capacity (39.24 mg g−1) for E2. The obtained polymers were applied as adsorbents for the magnetic solid phase extraction (MSPE) of E2. After optimizing the MSPE conditions, an MSPE-HPLC method was developed for the determination of E2 in milk powder. The linear range was 1–300 μg kg−1 with a limit of detection of 0.33 μg kg−1. The satisfactory recoveries ranged from 88.3–102.4% and the relative standard deviations (RSDs) were lower than 5.5%. Thus, the MSPE-HPLC method has high accuracy and sensitivity for the analysis of E2 in milk samples.
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EUROPEAN POLYMER JOURNAL
·
2019
·
IF 3.621
Xiaocheng Fan,Li Yang,Ting Wang,Tiedong Sun,Shuting Lu
A pH-responsive hydrogel having a drug combined effect was prepared for wound dressing by using dialdehyde carboxymethyl cellulose, tobramycin, β-cyclodextrin derivative and borneol. As a crosslinking agent, the aminoglycoside antibiotic drug tobramycin crosslinks dialdehyde carboxymethylcellulose to form a hydrogel through imine bonds. The positively charged cyclodextrin derivatives containing the auxiliary drug borneol are dispersed inside the hydrogel by electrostatic attraction with carboxyl groups. Imine bonds can break in response to the weakly acidic environment at the wound, thereby drugs and moisture inside the hydrogel are released to promote wound healing. Animal models and histological analysis indicate that the hydrogel achieves a satisfactory therapeutic effect in promoting wound healing. This hydrogel system is also applicable to other drugs containing multiple amino groups, such as neomycin, amikacin, streptomycin, etc., and has potential applications in the field of medicine.
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ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 29
·期 49
·1905576
·
IF 15.621
Dan Han,Dongya Ni,Qing Zhou,Jingjing Ji,Yanqin Lv,Yanfei Shen,Songqin Liu,Yuanjian Zhang
Rapid screening of polycyclic aromatic hydrocarbons (PAHs), a large class of toxic and carcinogenic compounds, is highly desirable for environmental and food safety. In principle, a photoluminescent (PL) assay is a potential route, but demands highly efficient and stable, low cost, and environment-friendly photoactive materials. 2D carbon nitride nanosheets (CNNS) that have triggered increasing interest may meet all these requirements. However, conventional applications of CNNS are restricted in aqueous solution, in which the long-term dispersibility is difficult to be addressed. Here, the harnessing of unique PL properties of CNNS is reported by dispersing them in a hierarchical polymeric matrix, driven by electrostatic interactions. Such a configuration not only enables a solid-state host to perpetually maintain homogeneous dispersibility of CNNS but also processes free channels for sufficient mass transfer. Moreover, the nanohybrid inherits the unique PL properties of CNNS. Further using β-CD as the molecular recognition unit, an economic, highly selective and sensitive paper-based PL sensor for PAHs is constructed via an inner-filter effect. This work opens a new avenue in harnessing unique PL properties of CNNS in solid state with superior stability for a variety of potential sensing applications, especially for point-of-care testing and/or in developing countries.
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MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Yuan Peng,Si-Yuan He,Fang-Huan Wang,Hao-Bo Zheng,Zhe Meng
In this work, a magnetic mesoporous molybdenum disulfide/graphite nanosheets (mm-MoS 2 /GN) was successfully synthesized and applied to magnetic solid phase extraction (MSPE) of 13 polycyclic aromatic hydrocarbons (PAHs) from edible oil samples. The prepared mm-MoS 2 /GN was characterized by FT-IR, XRD, VSM, BET, SEM and TEM. The influence of various parameters such as the adsorbent mass, adsorption/desorption time, and elution solvent through response surface methodology in MSPE was investigated. The porous and fluffy structure with rich active sites (π interactions, electrostatics, hydrogen bonds) and amphiphilicity properties of mm-MoS 2 /GN make it an ideal material for the separation and enrichment of trace PAHs in edible oils. Under optimal MSPE and GC-MS conditions, the linearity ranges of the proposed method were 1.0–100.0 μg·kg −1 with a satisfactory correlation coefficient above 0.9907. The limits of detection and quantification for 13 PAHs were 0.10–2.50 μg·kg −1 and 0.85–5.00 μg·kg −1 , respectively. The intra- and inter-day precisions were less than 3.0 % and 3.6 %, respectively. The recoveries for spiked edible oil samples ranged from 70.2 % to 112.6 % with RSDs of less than 5.8 %. In this work, a novel, rapid, economic and effective method was proposed, and successfully applied to detect polycyclic aromatic hydrocarbons in several oil samples from local market.
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JOURNAL OF CHEMICAL THERMODYNAMICS
·
2022
·
IF 3.269
Jinkun Guo,Bo Jin,Shijin Chu,Rufang Peng
A different type of heat-flow calorimeter is developed to measure the energy of combustion. This calorimeter uses differential thermopile as the heat-flow sensor. The calorimeter and oxygen bomb have a special structure to ensure that the heat generated by combustion heat is slowly transferred to the thermopile, and the temperature of the outside interface of the thermopile is constant. The calorific coefficient is determined by chemical calibration, providing for the chemical calibration S =(64.806 ± 0.029) μV mW −1 , which means uncertainty is 0.05 % for calibration. The combustion enthalpies of anthracene and naphthalene are measured by using this calorimeter, and the results agree with the literature values or recommended values.
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Nature Communications
·
2026
·
IF 18.1
Liu Xiao,Zhang Peng,Guo Yunpeng,Xiong Chuncen,Fu Hongru,Liu Guilong,Sui Dong,Liu Xianming,Ma Lufang,Zhao Yong,Wen Liping
Elucidating the failure mechanisms of Li metal electrodes is critical to accelerating the development of long cycle life Li metal batteries. However, it has not yet fully been realized so far due to the challenges associated with quantitative and qualitative characterization of solid electrolyte interphase on metal at large-area scale. Herein, we establish a relationship between solid byproducts and dead Li amounts in solid electrolyte interphase on Li metal by using fluorescence imaging and fluorescence titration method. The success of this methodology depends on the finding of a highly selective molecular probe, dilithium 3-hydroxy-2-naphthoate, with reversible change in fluorescence wavelength and intensity toward Li metal. Accordingly, the continuous generation of solid byproducts is acknowledged as potential underlying reason towards dead Li accumulation, determining the failure of Li electrode. These findings provide insights into the understanding of failure mechanism of Li metal electrode and design of strategies to improve its cycle life.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Shishi Shao,Jiaqiang Zhao,Wei Wang,Hanbing Nie,Yan Jie Li,Xuepeng Zhang,Cheng Zhi Huang,Peng Fei Gao
Host-guest doping room-temperature phosphorescence (RTP) materials have showed excellent potential for ultra-sensitive detection due to its bright luminescence in presence of trace guests. However, the inherent signal fluctuation of solid-state sensors restricts their widespread applications. Herein we constructed a simple internal standard method to overcome the signal fluctuation problem in RTP spectral analysis. Ultralong organic RTP can be obtained by using 1,4-dichlorobenzene (DCB) as a host and trace gaseous NL as a guest through the host-guest doping strategy. In this study, a dual-emission ratiometric phosphorescent probe pyrene (Py)/pentachloropyridine (PCP)-DCB was constructed by using the Py/PCP system fabricated via melt-casting as the reference afterglow and using the DCB as the stimuli-responsive unit of gaseous NL. This probe can be used for visual identification and content detection of NL in commercial mothballs. The ratio of phosphorescence intensity (I485/I595) was linearly related to the mass of added NL (mNL) within the range of 0.05–1.45 mg in this ratiometric RTP platform, and had a low detection limit of 0.012 mg. Furthermore, the NL content of five commercially available mothballs with different NL content was detected by this Py/PCP-DCB platform, and it had good performance compared to the gas chromatography (GC) analysis results.
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Analytical Methods
·
2023
·Vol. 15
·期 47
·6571-6582
·
IF 3.1
Yan Li,Xiaofan Tang,Yinhai Li,Weilong Zhao,Shengwei Guo,Chunmiao Bo
In this study, a developed chromatographic stationary phase combines the high selectivity of mixed-mode retention with a temperature-responsive property to boost separation efficiency. Copolymer brushes were grafted onto silica gels through surface initiated-atom transfer radical polymerization by polymerizing two types of monomer, temperature-responsive vinylcaprolactam (VCl) and quinine (Qun) containing benzopyridine, a tertiary ammonium positive center, and hydroxyl groups. The obtained silica@poly(Qun-co-VCl) stationary phases were packed as a chromatographic column, and the retention behavior of hydrophobic polycyclic aromatics, highly polar nucleosides, charged organic acids and β-agonists was studied for this column under different separation modes. The ability to separate different types of analyte shows that the silica@poly(Qun-co-VCl) column provides multiple hydrophobic, hydrophilic and electrostatic interactions toward analytes, achieving the separation of various compounds in one column. In addition, temperature-dependent resolution of polycyclic aromatics, nucleosides, organic acids and β-agonists was investigated using modulation of the column temperature, and the column exhibited adjustable separation selectivity by simply changing the column temperature. These results demonstrate that the grafting of copolymer brushes on a silica surface, consisting of temperature-responsive poly-VCl and multifunctional groups of poly-Qun, is useful as a mixed-mode chromatographic stationary phase for thermally-modulated multiple interactions. Additionally, this column was also used for the quantitative detection of uridine and inosine from cordyceps.
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PubMed
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MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 9
·1-10
·
IF 5.705
Zhou Xiu-Jie,Zhang Li-Shun,Song Wen-Fang,Huang Yan-Ping,Liu Zhao-Sheng
An inorganic-organic hybrid monolith incorporated with stellated mesoporous silica nanoparticles (SMSNs) was prepared. Using binary solvents, deep eutectic solvents and room temperature ionic liquids, an SMSN-incorporated poly(butyl methacrylate- co -ethylene glycol dimethacrylate) monolith demonstrated uniform structure with good column permeability. A systematic investigation of preparation parameter was performed, including SMSN content, crosslinking monomer content, and the component of binary solvent. The optimized monoliths were characterized by field emission scanning electron microscopy, transmission electron microscopy, area scanning energy dispersive spectrometry, and nitrogen adsorption. Column performance was tested by separating four groups of analytes (alkylbenzenes, anilines, naphthalenes and phenols) by capillary electrochromatography (CEC). Baseline separation of all analytes was obtained with column efficiencies of up to 266,000 plates m −1 . The performance of the resulting monolith was further investigated in detail by separating mixtures of polycyclic aromatic hydrocarbons (PAHs), nonsteroidal antiinflammatory drugs (NSAIDs), and hydroxybenzoic acid isomers. Compared with the corresponding SMSN-free monolith, the CEC performance was improved by about six times. Successful extraction of PAHs and quinolones (QNs) were also performed using this capillary. Improved extraction efficiency (20.2%) for complex samples, lake water, was also found when the material was applied to solid phase microextraction of fluoranthene.
A poly(butyl methacrylate-co-ethylene glycol dimethacrylate) monolith incorporated with stellated mesoporous silica nanoparticles was prepared. It demonstrated column efficiency up to 266,000 plates m −1 in capillary electrochromatography and ability as solid phase microextraction for organic small molecules with good column permeability.
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Chemical Science
·
2023
·Vol. 14
·期 44
·12570-12581
·
IF 8.4
Mingli Xu,Fengxue Zhang,Yanhui Zhang,Chen Wu,Xue Zhou,Xinping Ai,Jiangfeng Qian
Exploring a sodium-enriched cathode (i.e. Na4V2(PO4)3, which differs from its traditional stoichiometric counterpart Na3V2(PO4)3 that can provide extra endogenous sodium reserves to mitigate the irreversible capacity loss of the anode material (i.e. hard carbon), is an intriguing presodiation method for the development of high energy sodium-ion batteries. To meet this challenge, herein, we first propose a redox-potential-matched chemical sodiation approach, utilizing phenazine-sodium (PNZ-Na) as the optimal reagent to sodiate the Na3V2(PO4)3 precursor into Na-enriched Na4V2(PO4)3. The spontaneous sodiation reaction enables a fast reduction of one-half V ions from V3+ to V2+, followed by the insertion of one Na+ ion into the NASICON framework, which only takes 90 s to obtain the phase-pure Na4V2(PO4)3 product. When paired with a hard carbon anode, the resulting Na4VP‖HC full cell exhibits a high energy density of 251 W h kg−1, which is 58% higher than that of 159 W h kg−1 for the Na3VP‖HC control cell. Our chemical sodiation methodology provides an innovative approach for designing sodium-rich cathode materials and could serve as an impetus to the development of advanced sodium-ion batteries.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2023
·
IF 4.3
Hu Xingru,Pang Long,Wu Mingkai,Wang Chaohai,Li Jiansheng
Metal–organic framework-derived carbon materials have shown extensive application in the sensitive extraction of polycyclic aromatic hydrocarbons (PAHs), but more active sites for its adsorption were still a tireless pursuit. In this study, ZIF-nanoleaf-derived carbon (NLCs) was synthesized and developed as a solid-phase microextraction (SPME) fiber (NLCs-F). The extraction performance was compared with ZIF-dodecahedron-derived carbon (DHCs) coated fiber (DHCs-F), which was prepared by only changing the ratio of the reactants. The unique morphology of NLCs provided abundant adsorption active sites for the selected PAHs, while the large average aperture facilitated selective extraction of high molecular weight analytes. Additionally, the high carbon content enhanced the strong enrichment capability for hydrophobic PAHs. Hence, the prepared NLCs-F coupled with GC–MS showed a good correlation coefficient (0.9975) in a wide linear range, low limits of detection (0.3–1.8 ng L −1 ), satisfactory repeatability, and reproducibility, which made it apply in the enrichment of PAHs in actual tea and coffee samples. Graphical abstract
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APPLIED CATALYSIS A-GENERAL
·
2023
·
IF 5.5
Yu Liang,Lanjiang Wang,Xuekuan Li,Mingxing Tang,Qiong Tang,Jinxiang Dong,Lei Liu
Supported Pt catalysts are widely applied for the hydrogenation of polycyclic aromatic hydrocarbons, but it remains a challenge to achieve deep hydrogenation with high atomic utilization. Herein, a novel approach that combines physical vapor deposition with ozonation treatment was developed to construct the highly dispersed Pt on HY zeolite. The high concentration of O 3 was utilized to remove the ligand of acetylacetone platinum under mild condition due to its strong oxidizing properties, which markedly inhibited the aggregation of the Pt species. The hydrogenation of naphthalene and anthracene was investigated on such catalysts and compared with the catalyst prepared by traditional calcination approach, it was found that the co-existence of Pt single-atom and cluster on HY of 1Pt/HY-O 3 exhibited significantly high catalytic performance in the hydrogenation of naphthalene and anthracene, which was beneficiated from the synergistic effect of Pt single-atoms and clusters on HY support.
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