MICROCHEMICAL JOURNAL
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2024
·
IF 4.9
San-Jun Shi,Rong-Fu Huang,Zi-Yan Fan
Development of rapid and sensitive methods for screening of large number of chemical pollutants with potential genotoxicity is in urgent demands. In this work, we reported a chemical genotoxicity sensor based on the lateral flow strip (LFS) quantification of the 8-oxo-7,8-dihydro-2′-deoxyguanosine (8-oxodGuo). The proposed sensing strategy introduced human 8-oxoguanine DNA glycosylase (hOGG 1) and human apyrimidinic endonuclease (APE 1) to convert 8-oxodGuo to strand break. Then, the DNA conjugated gold nanoparticles (AuNPs) complexes could not be captured on test line (T-line), showing visible red color fading. Additionally, the mean grey value of the optical density in the T-line zone was analyzed by using a mobile phone camera and Image J software to quantify 8-oxodGuo. Under the optimized experimental conditions, the LFS DNA biosensor could detect the lowest concentration of 8-oxodGuo down to 0.2 pmol. To demonstrate its universal applications, in vitro generation of 8-oxodGuo by Rose Bengal under irradiation and Fe 2+ -mediated Fenton reagent were successfully measured. The detection limit of oxidative DNA damage induced by Rose Bengal or Fenton reagent could be down to 0.01 μM or 1 nM Fe 2+ /4 nM H 2 O 2 , respectively. The 10-fold higher sensitivity for Fenton reagent was attributed to much more severe damage than Rose Bengal, producing both DNA strand break and nucleobases conversion. The results demonstrated that the LFS DNA biosensor could detect oxidative DNA damage for the first time, showing its potential application for assessment of the genotoxicity of abundant chemical pollutants.
研究领域:
分析化学
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环境科学
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生物技术
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毒理学
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产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2015
·Vol. 21
·期 18
·6879-6887
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IF 5.731
Fei Pang,Mingyuan He,Jianping Ge
Graphical Increasing attraction : Fe 3 O 4 /zeolite imidazolate framework (ZIF-8) nanoparticles were synthesized through a room-temperature reaction between 2-methylimidazolate (MeIM) and zinc nitrate in the presence of Fe 3 O 4 nanocrystals (see figure; PAA=polyacrylic acid). The particles have a superparamagnetic response and can be separated by means of a magnetic field and redispersed into the solution after withdrawal of the field. Fe 3 O 4 /ZIF-8 nanoparticles were synthesized through a room-temperature reaction between 2-methylimidazolate and zinc nitrate in the presence of Fe 3 O 4 nanocrystals. The particle size, surface charge, and magnetic loading can be conveniently controlled by the dosage of Zn(NO 3 ) 2 and Fe 3 O 4 nanocrystals. The as-prepared particles show both good thermal stability (stable to 550 °C) and large surface area (1174 m 2 g −1 ). The nanoparticles also have a superparamagnetic response, so that they can strongly respond to an external field during magnetic separation and disperse back into the solution after withdrawal of the magnetic field. For the Knoevenagel reaction, which is catalyzed by alkaline active sites on external surface of catalyst, small Fe 3 O 4 /ZIF-8 nanoparticles show a higher catalytic activity. At the same time, the nanocatalysts can be continuously used in multiple catalytic reactions through magnetic separation, activation, and redispersion with little loss of activity.
研究领域:
材料科学
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化学工程
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纳米技术
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产品关联
DOI
PubMed
高影响因子
FIBERS AND POLYMERS
·
2023
·Vol. 24
·期 12
·4279-4286
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IF 2.5
Zhou Jianhua,Niu Zhuanli,Xiao Anguo,Li Xiang
Materials with passive daytime radiative cooling (PDRC) have drawn more attention as a result of their potential for energy savings. We prepared SiO 2 -encapsulated ZnO@ZIF-8 (ZZS) particles and a radiative cooling coating containing ZZS particles. Owing to the polyhedron structure and the phonon-polarization resonance of ZZS particles, the ZZS fabric coating could reflect sunlight with 83% and radiate heat to outer space with 0.96. Compared with the ambient air, its average temperature decreased by 6.4 °C, and the human body under direct sunlight could avoid overheating 3.9 °C. In addition, the ZZS coated fabric after rubbing still had good PDRC and its average temperature increased by 1.38℃ higher than the original ZZS coated fabric. Owing to good PDRC property, hydrophobicity, mechanical properties and simple methods, the widespread usage of ZZS coated fabric for personal thermal management appears to be promising.
研究领域:
材料科学
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能源工程
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纺织科学
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产品关联
DOI
高影响因子
ANALYST
·
2019
·Vol. 144
·期 12
·3892-3897
·
IF 4.019
Xiaobin Wang,Zhishan Fang,Zhuoyi Li,Wen Ying,Danke Chen,Haiping He,Xinsheng Peng
Mercury, as one of the most prevalent toxic metals released by various natural and anthropogenic processes, causes severe pollution of soil and groundwater. In this work, R-phycoerythrin (R-PE) proteins encapsulated into ZIF-8 composite thin films were prepared via a solid-confinement conversion process and applied as fluorescent sensors for mercury ion detection. The R-PE proteins encapsulated into ZIF-8 exhibit dual color emissions including green (518 nm) and red (602, 650 nm) fluorescence, while the original orange emission (578 nm) of pure R-PE is significantly suppressed. R-PE@ZIF-8 presents excellent selectivity and sensitivity for mercury detection in a large pH range without buffer solution. Under the optimal conditions, there is a good linear relationship between the fluorescence quenching efficiencies of R-PE@ZIF-8 and logarithmic concentrations of mercury ions in the range of 0.001–50 μM with the detection limit (LOD) of 6.7 nM much lower than the guideline value given by the World Health Organization. Furthermore, multi-peak detection of R-PE@ZIF-8 improves the detection accuracy of Hg2+ concentration.
研究领域:
环境科学
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生物化学
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DOI
PubMed
高影响因子
Polymers
·
2018
·Vol. 11
·期 1
·27
·
IF 2.935
Yuxiao Feng,Le Zhong,Muhammad Bilal,Zhilei Tan,Ying Hou,Shiru Jia,Jiandong Cui
Zeolitic imidazole framework-8 (ZIF-8) with tunable pore sizes and high surface areas have recently emerged as a promising support for immobilizing enzymes. However, the instability in the aqueous acidic environment and difficulty of recovery has limited their practical applications in some cases. In this study, catalase/ZIF-8 composites with a protective nanocoating were prepared by the controlled self-assembly of silanes or coordination complexes (tannic acid (TA) and Fe3+). The properties of the catalase (CAT)/ZIF-8 composites with a protective nanocoating were also determined. The recovered activity of CAT/ZIF-8 and CAT/ZIF-8 with protective nanocoating was 70% and 65%, respectively. Compared with the conventional CAT/ZIF-8 composites, CAT/ZIF-8 with protective nanocoating exhibited excellent acid resistance. For example, after treatment for 60 min in phosphate buffer solution (pH 3.0), CAT/ZIF-8 composites only maintained 20% of their initial activity (about 12 U/mg). However, CAT/ZIF-8 with a protective nanocoating could still retain about 50% of its initial activity (about 10 U/mg). Meanwhile, the thermostability and storage stability of the CAT/ZIF-8 composites was enhanced significantly due to the presence of nanocoating compared with conventional CAT/ZIF-8. More importantly, the CAT/ZIF-8 with a protective nanocoating retained 40% of its initial activity after 7 cycles, whereas CAT/ZIF-8 only retained 8% of the initial activity. The approach in this study could be an efficient strategy to prepare enzyme/ZIF-8 composites with both high acid resistance and excellent recyclability.Keywords:enzyme/ZIF-8 nanocomposites;nanocoating;stability;acid resistance
研究领域:
生物化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2024
·
IF 4.2
Pengpeng Zhang,Guoqi Song,Chao Wang,Zhou Chen,Xiangpeng Gao,Mingyang Li
The conventional methods of separating closely related minerals like chlorite and specularite present challenges. This study delved into the pre-adsorption effect of 8-hydroxyquinoline (8-HQ) in a reverse flotation system using dextrin as a depressant and dodecylamine as a collector through single mineral flotation experiments, contact angle tests, Zeta potential determination, Fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS). The aim was to facilitate reverse flotation by pre-introducing 8-HQ to create specific adsorption with Al/Mg elements on the chlorite surface, thereby enhancing chlorite's flotation ability. Single mineral flotation experiments demonstrated that 8-HQ effectively heightened the disparity in floatability between the two minerals. When 15 mg/L of 8-HQ was added at a pH of 8, chlorite recovered 82.15 percent, while specularite only produced 19.2 percent. Results from artificial mixed minerals substantiated the feasibility of single mineral flotation. Further investigation into adsorption mechanisms revealed that 8-HQ forms steric hindrance via chelation and hydrogen bonding, preventing dextrin from adhering to the metal elements on the chlorite surface. The inherent hydrophobicity also promotes the formation of DDA hydrophobic flocs. Conversely, there was no notable adsorption between 8-HQ and specularite. Specularite could be specifically depressed by dextrin, enabling the selective separation of the two minerals. Finally, a model depicting the potential adsorption of 8-HQ on the mineral surface was proposed.
研究领域:
矿物加工工程
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表面化学
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产品关联
DOI
高影响因子
Polymers
·
2024
·Vol. 16
·期 8
·1150
·
IF 4.7
Xinchao Wang,Jiale Hu,Jiajia Liu,Yixin Liang,Lan Wu,Tie Geng,Shihua Liu,Yonggang Guo
Polyether ether ketone (PEEK) is esteemed as a high-performance engineering polymer renowned for its exceptional mechanical properties and thermal stability. Nonetheless, the majority of polymer-based lubricating materials fail to meet the contemporary industrial demands for motion components regarding high speed, heavy loading, temperature resistance, and precise control. Utilizing 3D printing technology to design and fabricate intricately structured components, developing high-performance polymer self-lubricating materials becomes imperative to fulfill the stringent operational requirements of motion mechanisms. This study introduces a novel approach employing 3D printing technology to produce PEEK with varying filling densities and conducting in situ synthesis of zeolitic imidazolate framework (ZIF-8) nanomaterials on its surface to enhance PEEK’s frictional performance. The research discusses the synthetic methodology, characterization techniques, and tribological performance evaluation of in situ synthesized ZIF-8 nanomaterials on PEEK surfaces. The findings demonstrate a significant enhancement in frictional performance of the composite material under low-load conditions, achieving a minimum wear rate of 4.68 × 10−6mm3/N·m compared to the non-grafted PEEK material’s wear rate of 1.091 × 10−5mm3/N·m, an approximately 1.3 times improvement. Detailed characterization and analysis of the worn surface of the steel ring unveil the lubrication mechanism of the ZIF-8 nanoparticles, thereby presenting new prospects for the diversified applications of PEEK.
研究领域:
材料科学
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表面工程
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纳米技术
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ORGANOMETALLIC CHEMISTRY
·
2025
·
IF 2.4
Ke Yang,Sisi Cheng,Shijia Li,Kun Zhu,Ziqin Yao
The influencing factors of ZIF-8 synthesis were systematically investigated by the green synthesis method and the samples were also compared with ZIF-8 synthesized in other ways, and an optimal synthesis route was found by exploring the synthesis conditions. On this basis, the synthesis mechanism of ZIF-8 was analyzed. The research results show that the key influencing factors in the reaction process are the amount of NaOH and the pH value of the system. Different amounts of NaOH will produce different intermediates, and these intermediates further affect the pH value of the entire reaction system. The pH value of the system plays a decisive role in the deprotonation process of the ligand in the reaction, and this process is the key to whether the ZIF-8 structure can be formed. It is worth mentioning that the ZIF - 8 synthesized in this study demonstrates varying removal performances for different dyes under different conditions. Under specific conditions, it exhibits the maximum removal rate for Rhodamine B (RhB), reaching 99.97 %. This excellent removal performance is closely associated with the pore - structure characteristics of the synthesized material, which fully indicates that the ZIF - 8 synthesized through the green route has certain application potential and promising application prospects in related fields.
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
CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Ting Su,Hongxia Shang,Xinru Su,Zhixian Sun,Yuehan Li,Linwen Li,Zhen Zhang,Renyong Geng,Shuisheng Chen
In this investigation, a hydrogel adsorbent featuring remarkable efficiency in dye adsorption was successfully synthesized by the integration of natural polysaccharide (pullulan) and nanoparticles (ZIF-8@PDA). The prepared natural polysaccharide nanocomposite hydrogels not only exhibit superior mechanical strength and biocompatibility, but also demonstrate adeptness in the removal of dye pollutants. The dye removal capacities were 615.4 mg/g for malachite green (MG) and 525.8 mg/g for Congo red (CR), respectively. Notably, the adsorption process exhibits minimal susceptibility to variations in water quality and the presence of co-existing ions. The pH-responsive surface charge conversion capability of the adsorbent renders it recyclable, maintaining a dye adsorption performance exceeding 88 % even after 5 cycles of repeated usage. Overall, these environmentally friendly natural polysaccharide nanocomposite hydrogels hold potential for addressing complex wastewater treatment challenges and long-term use.
研究领域:
材料科学
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环境科学
·
生物材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2020
·Vol. 12
·期 32
·4058-4063
·
IF 2.596
Hao Guo,Xiaoqiong Wang,Ning Wu,Mengni Xu,Mingyue Wang,Longwen Zhang,Wu Yang
A novel composite (CDs@ZIF-8) based on carbon dots (CDs) and zeolitic imidazolate framework (ZIF-8) was successfully synthesized by encapsulating CDs into the pores of ZIF-8 through a simple one-pot solvothermal method. The as-synthesized CDs@ZIF-8 inherited simultaneously the strong adsorption capacity of ZIF-8 and the excellent optical properties of CDs. The composite exhibited excellent dispersibility and high structural and fluorescence stability in aqueous solution, which could be employed as an excellent turn-off mode fluorescent probe to detect Cu2+. The large specific surface area and strong adsorption properties of ZIF-8 enabled the resultant composite to effectively enrich Cu2+ for further improving the analytical sensitivity. The possible fluorescence quenching mechanism has also been discussed in detail and it was found that the effective fluorescence quenching of Cu2+ to CDs@ZIF-8 could be attributed to the strong ability of Cu2+ to combine with the carboxyl group or amino group on the CD surface and the strong adsorption capacity of ZIF-8; their synergistic effect resulted in effective fluorescence quenching.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Xiu Dai,Xu Li,Xinlong Wang
In this work, the nanoparticles of zeolitic imidazolate framework-8 (ZIF-8) are incorporated into poly (lactic acid) (PLA) to prepare porous electrospun membranes. The morphology, mechanical property as well as the PM capture process and capacity of the membranes are studied using scanning electron microscopy (SEM), BET test, X-ray diffraction (XRD), tensile test, Fourier infrared spectra (FT-IR), UV–visible spectra, thermogravimetric analyses (TGA) and photoelectron spectroscope (XPS), systematically. The results demonstrate that the diameter and nanoscale porous structure of fibres can be successfully controlled by changing the content ZIF-8. The PLA/ZIF-8 membranes show better mechanical property compared with pure PLA membrane. The PM capture measurement demonstrates that the PLA/ZIF-8 porous membranes exhibit significantly enhanced PM2.5 removal efficiency compared to that of the pure PLA membrane. The prepared porous membranes also show low pressure drops and good recycling performance.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
JOURNAL OF FOOD SCIENCE
·
2021
·Vol. 86
·期 8
·3550-3562
·
IF 3.167
Ying Cai,Jingwei Guan,Wen Wang,Li Wang,Jianyu Su,Liming Fang
Food packaging materials, especially biodegradable polymer composites incorporated with natural antimicrobial agents with excellent antibacterial activities, are in high demand and attracted immense attention. Herein, a polycaprolactone/curcumin@zeolitic imidazolate framework-8 (PCL/Cur@ZIF-8) composite film with enhanced antibacterial activity was developed. Curcumin, a natural photosensitizer, was loaded in the highly porous nanocrystals ZIF-8 to improve its poor water solubility and stability. The integral structure of Cur@ZIF-8 was maintained well in the PCL matrix even at the highest loading of 35% (w/w), and all composite films had good light transmittance at 420–430 nm. The PCL/Cur@ZIF-8 composite films responded to the acidic growth environment of bacteria by releasing zinc ions and curcumin molecules. Furthermore, upon blue light irradiation (420–430 nm, 2.2 mW/cm 2 ), curcumin molecules generated singlet oxygen. With the synergistic effects of zinc ions and singlet oxygen, the composite films exhibited a 99.9% reduction of Escherichia coli and Staphylococcus aureus strains when the amount of Cur@ZIF-8 loading was more than 15% (w/w), as well as a strong anti-adhesion effect on bacteria. Moreover, bacterial resuscitation tests indicated that the composite films exhibited 99.9% reduction in the adhered bacteria population through treatment with photodynamic sterilization. This is the first study presenting that the incorporated curcumin ZIF-8 nanoparticles in the matrix of polymer are pH and light responsive for anti-adhesion of bacteria, which is of great potential application as antibacterial packaging material for the food industry. Practical Application A novel, biodegradable, pH, and light-responsive composite film was developed for antibacterial activity. Natural photosensitizer curcumin was encapsulated in ZIF-8 nanocrystals (Cur@ZIF-8) as the antimicrobial agent. With the synergistic effects of Zn 2+ and singlet oxygen, the composite film exhibited a 99.9% reduction of Escherichia coli and Staphylococcus aureus strains, and a strong anti-adhesion property toward bacteria. This composite film is of great potential application as an antibacterial packaging material that enhances the shelf life of fruits, meat, and so on.
研究领域:
食品科学
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材料科学
·
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）