BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2019
·Vol. 103
·期 1
·199-205
·
IF 1.65
Zhang Wanying,Huang Yingnan,Gong Hua,Dang Fei,Zhou Dongmei
Metal dioxide nanoparticles (NPs) are produced in ever-increasing amounts and widely used in industrial, medical and consumer products. They may pose potential risks to the environment. In this study we quantitatively evaluated the phytoavailability of CeO 2 NPs, ZrO 2 NPs and SiO 2 NPs to wheat ( Triticum aestivum L.). Metal dioxide NPs showed distinct differences in uptake, with uptake rate constants of 90.2 ± 9.9, 12.2 ± 2.5, 0.4 ± 0.02 and 0.9 ± 0.1 L kg −1 h −1 for ZrO 2 NPs, CeO 2 NPs, SiO 2 NPs (13 nm) and SiO 2 NPs (25 nm), respectively. However, such difference cannot be generalized by single factor of NP characteristics and/or root damage. This study provides fundamental information for NP uptake by crop plants.
研究领域:
环境科学
·
植物学
✓ 已验证
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Laijin Zhong,Xin Hu,Zhaoming Cao,Hongwei Wang,Yijun Chen,Hong-zhen Lian
The increasing application of engineered nanoparticles such as silver nanoparticles (nAg) and zinc oxide nanoparticles (nZnO), results in their accumulation in environmental media. The environmental natural organic matter (NOM) adsorbed by these nanoparticles may have great effects on the aggregation and dissolution of metall ions, which are interesting and important for the assessment of the inhalation risks of these airborne suspended NOM-coated nanoparticles to humans. Therefore, the aggregation and dissolution of nAg and nZnO pretreated with citric acid (CA), tartaric acid (TA) and fulvic acid (FA) in simulated lung biological fluids (artificial lysosomal fluid (ALF) and Gamble Solution) were investigated. The surface properties, morphology and size of the NOM-treated ENPs changed, but the crystalline phase was relatively stable when observed using surface-enhanced Raman scattering , transmission electron microscope , and X-ray diffraction. NOM treatment had no significant influence on the particle size of NOM-treated nAg and nZnO except for a decrease in the size of CA-treated nAg, and it could not promote the aggregation of NOM-treated nAg and nZnO except for the aggregation of TA-treated nAg in Gamble Solution or TA-treated nZnO in ALF. CA- and FA-treatments promoted the release of Zn 2+ and Ag + , respectively, while no promotion was observed after TA-treatment. Therefore, NOM affects the release of Zn 2+ and Ag + from NOM-treated nAg and nZnO but does not promote the aggregation of NOM-treated nAg and nZnO, which influences the inhalation risk-based assessment.
研究领域:
环境科学
·
毒理学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2021
·
IF 5.706
Jin-Tao Du,Meng Qiao,Yuan Pu,Jie-Xin Wang,Jian-Feng Chen
The reduction of nitroarenes is usually catalyzed by heterogeneous catalysts. In this work, highly stable aqueous dispersions of monodisperse Pt, Pd, and Au nanoparticles stabilized by thermosensitive polymer, poly(N-isopropylacrylamide) (PNIPAM), are conveniently synthesized with the average sizes of 2.3, 3.1, and 2.3 nm, respectively. The modulation of the hydrophilic-hydrophobic nano-environments of the catalysts can be selectively provided by utilizing the temperature-responsive characteristics of PNIPAM. They are effective and thermosensitive pseudohomogeneous catalysts for nitroarenes reduction. The decreasing trend of catalytic activity is as follows: PNIPAM-Au > PNIPAM-Pd > PNIPAM-Pt. The catalytic reduction of nitrobenzene (NB), 4-nitrophenol (4-NP), and o-nitroaniline (o-NA) follow the pseudo-first-order kinetics, and the catalytic rates can be tuned by utilizing their temperature-responsive behavior. PNIPAM-Au nanocatalysts exhibit high turnover frequencies (TOF) up to 84, 12.9, and 40 min −1 for catalytic reduction of NB, 4-NP, and o-NA at 20 °C, respectively, which are one of the highest values ever reported.
研究领域:
化学
·
催化科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2023
·Vol. 234
·期 4
·1-17
·
IF 2.9
Huang Juan,Qian Xiuwen,Li Xuan,Hu Qian,Cao Chong,Yan Chunni
Increasing consumption of nanoparticles (NPs) led to their accumulation in environment like soil, causing public anxiety to their hazards. In this study, dynamic impacts of three NPs (silver (Ag), zinc oxide (ZnO), and fullerene (C 60 )), and their derivatives on soil were evaluated along time. Different influences caused by category and concentration were also compared. As results demonstrated, Ag NPs and Ag + brought more evident toxicity on soil enzymes than others, in which dehydrogenase exerted the most sensitivity. Such stress to enzymes was dose-dependent in groups of Ag NPs, Ag + , and C 60 OH. Two-way ANOVA reveled the interaction of concentration and category on enzymes between different groups. More significant reduction of bacterial density and alterations of bacteria community were observed with Ag NPs treatment. Nitrogen transformation was suppressed by various NPs, via inhibition on related bacteria including Flavobacterium and Nitrospira . Existence of time effect on bacteria was also confirmed. In brief, metal NPs and their dissolved ions could pose stronger threats to soil microenvironment compared to metal oxide and carbon-based NPs, and their derivatives. These results provide comprehensive evidence for effects of NPs on soil, which could generate new leads on secure application of them.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Jia Ke,Yingnan Zhu,Jiamin Zhang,Jing Yang,Hongshuang Guo,Weiqiang Zhao,Chiyu Wen,Lei Zhang
Silk is an attractive natural fiber due to its excellent mechanical properties and biocompatibility. Xenobiotic modification of pristine silk is gaining significant attention to meet specific demands. The silk payload of xenobiotics is affected by their uptake efficiency, biodistribution, metabolism, and excretion. Herein, we systematically evaluated the effect of the nanoparticle size (20–100 nm) on the biodistribution and silk production by introducing silver nanoparticles (AgNPs) into the silkworm diet. Interestingly, the silk payload of AgNPs is highly dependent on their overall size, where 50 nm AgNPs are prone to accumulate in silk glands and reveal the highest content in the produced silk, qualifying silk antibacterial activity against both Gram-positive and Gram-negative bacteria. These findings provide new insights to understand how nanoparticle properties influence the incorporation of nanomaterials into silk and can help optimize the material design.
研究领域:
生物材料学
·
纳米生物学
·
昆虫学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2021
·Vol. 13
·期 17
·8024-8029
·
IF 7.79
Wei Bing,Faming Wang,Yuhuan Sun,Jinsong Ren,Xiaogang Qu
Herein, an environmentally friendly biomimetic strategy was proposed and validated for the catalytic hydrogenation reaction in live bacteria. First, we used a thermophilic hydrogen-producing bacterial strain to in situ prepare ultrafine gold nanoparticles (AuNPs) and palladium nanoparticles (PdNPs). Then, by utilizing AuNPs or PdNPs as catalysts and on-site hydrogen gas generated directly through living thermophilic hydrogen-producing bacteria, we realized highly efficient asymmetric hydrogenation reactions.
研究领域:
微生物学
·
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2019
·Vol. 21
·期 5
·1-15
·
IF 2.009
Wang Chao,Lv Bowen,Hou Jun,Wang Peifang,Miao Lingzhan,Ci Hanlin
The cerium dioxide nanoparticle (CeO 2 NP) (122 nm) aggregation process was investigated by nanoparticle tracking analysis (NTA), and the results were compared with those of dynamic light scattering (DLS). Unlike descriptions based on classical aggregation kinetics theory, the size distributions obtained by NTA and DLS show that aggregation of NPs in an aquatic environment is a complicated process and highly dependent on the particle number concentration, which is information that has been rarely presented in the literature. In particular, not all the particles were aggregated and there still remained some small CeO 2 NPs (< 400 nm), which has potential adverse environmental risks to the ecosystem and public health. Furthermore, the aggregate sizes are far smaller than previously shown in aggregation kinetics experiments. In addition, our findings also indicate that NTA can measure samples with mass concentrations ranging from 0.1 to 100 mg/L without dilution. In contrast, DLS cannot provide accurate information about aggregation kinetics when the mass concentration of CeO 2 NPs is lower than 1 mg/L (2.02 × 10 8 ± 1.66 × 10 7 by NTA data). Consequently, the classical aggregation kinetics experiment using DLS cannot accurately reflect the fate of NPs in aquatic environment, especially the heteroaggregation of NPs in complex water phase, and these results further demonstrate that the toxicity evaluation of NPs concerning different sizes measured by DLS need more rigorously experimental design. Therefore, our findings provide the first quantitative attempt to explore the experimental conditions and analytical methods for further study of aggregation kinetics.
研究领域:
环境科学
·
纳米生物学
✓ 已验证
产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2013
·Vol. 15
·期 46
·20140-20146
·
IF 3.829
Li Shi,Ting Yu,Luwei Sun,Xiaodong Pi,Xinsheng Peng
A free-standing fluorescent gelatin–Si nanoparticle composite thin film is facilely prepared by means of a filtration technique assisted by porous copper hydroxide nanostrands as a sacrificial layer. The as-prepared gelatin–Si nanoparticle composite film is greatly portable, flexible, transparent and free-standing. The most important advantage is its robust storage stability stored in ambient air, which make it promising for various applications. Meanwhile, a gelatin–Si–Au nanoparticle composite film is also successfully prepared by the formation of Au NPs in a gelatin–Si nanoparticle composite film through the in situ reduction of HAuCl4 at room temperature. The photoluminescence (PL) quenching and blue shift in the peak of the emission spectra occur due to the energy transfer from Si NPs to Au NPs. By varying the amount and size of Au NPs incorporated into the gelatin–Si nanoparticle composite film, the energy transfer efficiency can be controlled. This is a general method to prepare metal–semiconductor hybrid fluorescent nanomaterials, which offers the possibility of tuning the luminescence intensity and wavelength of the emitted light.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Yongshuai Jing,Jiaying Li,Yuwei Zhang,Ruijuan Zhang,Yuguang Zheng,Beibei Hu,Lanfang Wu,Danshen Zhang
A novel polysaccharide (GLP) with a molecular weight of 1.37 × 10 5 Da was purified from the roots of G. littoralis . Using monosaccharide composition, methylation analysis, GC–MS, 1D and 2D NMR , the structure of GLP was determined to be a 1 → 4)- α -D-Glc p glycoside linkage, while the terminal group of 1→)- α -D-Glc p was bonded to the main chain via O-6. Then, GLP-NPs were prepared by nano-precipitation method, the particle size of GLP-NPs was 288.4 nm and PDI was 0.340. GLP-NPs-AgNPs were prepared using GLP-NPs as reducing agent. GLP-NPs-AgNPs were characterized by ultraviolet-visible spectrophotometer (UV–Vis), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscope (TEM) and X-ray diffraction (XRD). The yield of GLP-NPs-AgNPs was 38.77%, the particle size was 12.5 nm and the chelation rate of silver nanoparticles with polysaccharides was 67.5%. GLP-NPs-AgNPs had better antioxidant and antibacterial activities than GLP and GLP-NPs. In the present work, a simple and eco-friendly approach for the synthesis of silver nanoparticles (AgNPs) using G. littoralis polysaccharides nanoparticles (GLP-NPs) as reducing agent.
研究领域:
植物化学
·
生物技术
·
药理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2019
·Vol. 30
·期 41
·415602
·
IF 3.399
Na Wang,Min Zhang,Libin Liu,Jing Zheng,Jingli Xu,Tasawar Hayat,Njud S. Alharbi
A unique nanostructure of Fe3O4 nanoparticles (NPs)-in/carbon layer/out-Ni NPs was developed and proved to be an efficient catalyst and protein adsorbent. This kind of nanostructure was formed through a space-confined pyrolysis procedure using polydopamine-Ni2+ coated Fe-NTA nanowires as the precursor. A N-doped carbon interlayer derived from polydopamine (PDA) supported a large amount of Ni NPs and entrapped well-defined Fe3O4 NPs, which were obtained through reduction of Ni2+, Fe3+ by carbonized NTA groups and a PDA layer. The contributions of the unique configuration along with the high density of Ni NPs in Fe3O4@C-Ni are significant for improving catalysis and protein adsorption performance, which is expected to be a promising alternative to other conventional catalysts and protein adsorbents. Due to the unique novel nanostructure, this nanocomposite possesses a wide range of applications, not only for catalytic reactions but also for other inhomogeneous reactions.
研究领域:
材料科学
·
催化化学
·
生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Environmental Science & Technology Letters
·
2016
·
IF 4.839
Xiaoru Guo,Yongguang Yin,Zhiqiang Tan,Zongmian Zhang,Yongsheng Chen,Jingfu Liu
Water surface microlayer (SML), as the interface between water and the atmosphere, shows distinct physicochemical properties that differ from those of underlying water. Herein, for the first time, we demonstrate the SML enrichment of nanoparticles (NPs) by using silver nanoparticles (AgNPs) as a model via indoor experiments. The occurrence of SML enrichment of AgNPs was confirmed by the increased concentration of NPs in the SML relative to that in the bulk phase, and the in situ recording of the enhanced Raman spectroscopy intensity of a probe adsorbed on AgNPs in the SML. The significant enrichment of NPs is strongly influenced by environmentally relevant factors such as the solution pH, ionic strength, and natural organic matter. Additionally, the SML enrichment factor was estimated to be 14.6–26.5 for AgNPs in natural waters. Our findings indicate that NPs are inclined to accumulate in the SML, which could cause environmental effects that are differential to the bulk phase.
研究领域:
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF DAIRY SCIENCE
·
2017
·
IF 2.474
Kai Luo,Liming Hu,Qi Guo,Chenghui Wu,Songsong Wu,Daofeng Liu,Yonghua Xiong,Weihua Lai
ABSTRACT Immunochromatographic assays (ICA) are widely used to detect pathogens. In this study, we used traditional gold nanoparticles (GNP), quantum dots (QD), fluorescent nanoparticles (FNP), and europium (Eu) (III) chelate nanoparticles (EuNP) as ICA labels. We first compared the ability of the 4 ICA test strips to quantitatively detect Escherichia coli O157:H7 in milk. We then optimized various parameters influencing the ICA. The sensitivity to E. coli O157:H7 of the GNP-ICA, QD-ICA, FNP-ICA, and EuNP-ICA was 2.5 × 10 4 , 5 × 10 3 , 1.0 × 10 3 , and 5.0 × 10 2 cfu mL −1 , respectively. The EuNP-ICA exhibited the highest sensitivity. The amounts of monoclonal antibodies (mAb) per GNP-ICA, QD-ICA, FNP-ICA, and EuNP-ICA test strip were 0.16, 0.37, 0.04, and 0.10 μg, respectively. The corresponding coefficients of variation were 7.4 to 15.8%, 10.4 to 18.6%, 2.7 to 7.8%, and 6.9 to 10.5%, respectively. The FNP-ICA required the least mAb per test strip and had the best coefficient of variation. The linear ranges of GNP-ICA, QD-ICA, FNP-ICA, and EuNP-ICA were 1.0 × 10 4 to 1.0 × 10 6 , 2.5 × 10 3 to 1.0 × 10 6 , 2.5 × 10 2 to 2.5 × 10 5 , and 2.5 × 10 2 to 2.5 × 10 5 cfu mL −1 , respectively. The FNP-ICA and EuNP-ICA had wider linear ranges than GNP-ICA and QD-ICA. Additionally, the FNP-ICA and EuNP-ICA showed better tolerance than GNP-ICA and QD-ICA in the milk samples. The FNP-ICA and EuNP-ICA showed remarkable potential for detection of pathogens in milk.
研究领域:
食品安全检测
·
微生物学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）