COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2012
·
IF 2.236
Tao Sun,Jian Shen,Hui Yan,Jingcheng Hao,Aiyou Hao
Methylated β-cyclodextrin and a class of phthalate esters were found to be able to form “supramolecular amphiphiles” with double-chains in aqueous solution and could further assemble into stable vesicles under variable conditions. The vesicles were fully characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), dynamic light scattering (DLS) and Cryo -transmission electron microscopy ( Cryo -TEM). The mechanism of the vesicle-formation was suggested based on the UV–vis spectrum, 1 H NMR, 2D NMR NOESY, FT-IR spectrum and X-ray diffraction (XRD) results and further simulated by molecular dynamic simulation. The vesicles’ responses to the stimuli were also studied.
研究领域:
化学
·
生物学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2012
·
IF 4.98
Zhixing He,Hailong Xiao,Lu Tang,Hang Min,Zhenmei Lu
HD-1, a stable microbial consortium capable of mineralizing di- n -butyl phthalate (DBP), was developed from activated sludge. The dominant microorganisms in the consortium, Gordonia sp., Burkholderia sp. and Achromobacter sp., were identified by denaturing gradient gel electrophoresis (DGGE). The consortium could mineralize approximately 90% of 1200 mg/L DBP after 48 h of cultivation. The optimal DBP degradation conditions were 25–30 °C and pH 8.0–9.0. The addition of yeast (0.5 g/L), sodium acetate (0.5 g/L, 1.0 g/L), Brij 35 (0.2%, 0.5%, 1.0%), or Triton X-100 (0.2%) enhanced DBP degradation. The DBP degradation rate was influenced by the presence of dimethyl phthalate (DMP) and diethyl phthalate (DEP). Only one main intermediate, phthalic acid, could be monitored by gas chromatography–mass spectrometry (GC–MS) during the degradation process. The HD-1 consortium also utilized phenol, o -dihydroxybenzene as the sole carbon and energy source. The results indicate the consortium may represent a promising application for DBP bioremediation.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
·
2020
·
IF 5.715
Pei-Pei Du,Yu-Hong Huang,Huixiong Lü,Lei Xiang,Yan-Wen Li,Hui Li,Ce-Hui Mo,Quan-Ying Cai,Qing X. Li
Phthalic acid esters (PAEs) is a class of prevalent pollutants in agricultural soil , threating food safety through crop uptake and accumulation of PAEs. Accumulation of PAEs varies largely among crop species and cultivars. Nevertheless, how root exudates affect PAE bioavailability , dissipation, uptake and accumulation is still not well understood. In the present study, desorption and pot experiments were designed to investigate how root exudates from high-( Peizataifeng ) and low-( Fengyousimiao ) PAE accumulating rice cultivars affect soil PAE bioavailability, dissipation, and accumulation variation. Rice root exudates including low molecular weight organic acids (LMWOAs) of Peizataifeng and Fengyousimiao could enhance desorption of two typical PAE compounds, di-n-butyl phthalate (DBP) and di-(2-ethylhexyl) phthalate (DEHP), from aged soil to their available fractions by increasing soil dissolved organic carbon (DOC), thus improving their bioavailability in soil. Peizataifeng produced twice higher amounts of oxalic acid , critic acid and malonic acid in root exudates, and exhibited stronger effects on enhancing desorption and bioavailability of DBP and DEHP than Fengyousimiao . Higher (by about 50%) total organic carbon contents of root exudates from Peizataifeng led to higher (by 10–30%) soil microbial biomass carbon and nitrogen than Fengyousimiao , and thus promoted more PAE dissipation from soil than Fengyousimiao . Nevertheless, higher (by 20–50%) soil DOC and significantly higher PAE bioavailability in the soils planted Peizataifeng resulted in greater (by 53–93%) PAE accumulation in roots and shoots of Peizataifeng than Fengyousimiao , confirming by higher (by 1.82–3.48 folds) shoot and root bioconcentration factors of Peizataifeng than Fengyousimiao . This study reveals that the difference in root exudate extent and LMWOAs between Peizataifeng and Fengyousimiao differentiates PAE accumulation.
研究领域:
环境科学
·
农业科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD AND CHEMICAL TOXICOLOGY
·
2020
·
IF 4.679
Zengqiang Li,Yige Yu,Yang Li,Feifei Ma,Yinghui Fang,Chaobo Ni,Keyang Wu,Peipei Pan,Ren-Shan Ge
Di-n-butyl phthalate (DBP) is widely used in consumer products as a plasticizer . Here, we report a natural product taxifolin that can attenuate developmental and reproductive toxicity of DBP. Pregnant rats were daily gavaged with 500 mg/kg DBP alone or together with taxifolin (10 and 20 mg/kg) from gestational day (GD) 12–21. At GD21, sera and testes of male fetus were collected. DBP significantly lowered serum testosterone level at 500 mg/kg and taxifolin can completely reverse its action. DBP caused abnormal aggregation of fetal Leydig cells and taxifolin can reverse it. DBP down-regulated the expression of the genes of cholesterol side-chain cleavage enzyme ( Cyp11a1 ), 17β-hydroxysteroid dehydrogenase 3 ( Hsd17b3 ), and insulin-like 3 ( Insl3 ) and taxifolin can reverse its action. DBP increased malondialdehyde levels and decreased superoxide dismutase and glutathione peroxidase expression and taxifolin can reverse it. DBP increased incidence of multinucleated gonocytes and taxifolin can prevent it. Moreover, DBP lowered sirtuin 1 (SIRT1)/peroxisome proliferator-activated receptor γ coactivator 1-α (PGC-1α) and phosphorylated AMP-activated protein kinase (pAMPK) signalling and taxifolin antagonized DBP. In conclusion, in utero exposure to DBP caused developmental/reproductive toxicity of male offspring via increasing reactive oxygen species and taxifolin is an effective food component that completely reverses DBP-mediated action.
研究领域:
毒理学
·
生殖健康
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yi Hao,Yuan Gao,Luyao Gao,Yulian He,Yingying Niu,Sameer Hussain,Ruixia Gao,Lisa D. Pfefferle,M. Shahid,Sicen Wang
A new class of amphiphilic magnetic adsorbents (denoted as Fe 3 O 4 -GPS-A) is fabricated by functionalization of the Fe 3 O 4 surface with six different amphiphilic silanizing agents that are specifically tailor-made to the chemical structure of PAEs. The resulting Fe 3 O 4 -GPS-A exhibit different contact angles due to the significant changes in functional groups, as revealed by 1 H NMR and FTIR spectroscopy. Among six Fe 3 O 4 -GPS-A, Fe 3 O 4 -DOA and Fe 3 O 4 -OAN exhibit a fast adsorption process (within 60 min) and high adsorption capacity for dibutyl phthalate (DBP) and dioctyl phthalate (DOP), two commonly used phthalate esters (173.7 mg g −1 for DOP and 104.4 mg g −1 for DBP), in conjunction with fast magnetic responsiveness and good thermal stability. The adsorption performance of Fe 3 O 4 -DOA and Fe 3 O 4 -OAN were well-maintained even after ten cycles. Besides, the adsorption mechanism was investigated through adsorption fitting models and theoretical calculations, which inferred that the interactions between adsorbent and adsorbate are mainly based on hydrophobic interactions along with secondary non-covalent contacts. Finally, the adsorbents combined with GC–MS analyses were applied to monitor DBP and DOP in the lake water samples. This work not only opens up a strategy for amphiphilic modification of magnetic adsorbents, but also provides a new avenue in their application for phthalate esters detection.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Haiyuan Chi,Chengjun Li,Mei Huang,Jinquan Wan,Xiaoxia Zhou,Bing Yan
Sulfate radicals-based advanced oxidation processes are regarded as effective methods for removing organic contaminants. However, current removal technologies are often unable to achieve satisfactory results due to the low concentrations and high stability that are frequently characteristics for many types of organic contaminants. To improve the efficacy of using sulfate radicals to remove organic contaminants, we designed metal–organic frameworks (Fe(II)-MOFs) modified with enrichment and specific recognition of molecular imprinting layer (Fe(II)-MOFs@MIP). Using dibutyl phthalate (DBP) as the model target contaminant, the selectivity coefficient towards DBP was 7.28 for adsorption and 4.46 for catalytic degradation of Fe(II)-MOFs@MIP, which is excellent for most of the imprinted material. Additionally, we achieved the accurate recognition (169.25 μg × g −1 ) and efficient degradation (0.071 min −1 ) of DBP reducing levels to 100 μg × L -1 . UV–vis analysis confirmed that specific recognition of DBP was mainly through hydrogen bonding and π-π interaction, while in-situ Raman and radical quenching experiments showed that the imprinting layer could accurately adsorb and produce the spatial confinement effects on target contaminants, thereby reducing the transfer distance of free radicals. As a result, we show that Fe(II)-MOFs@MIP can achieve efficient targeted degradation of DBP, opening up a new avenue for the removal of this and other highly stable organic contaminants present at low concentrations in environmental systems.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2019
·
IF 3.571
Lei Xiang,Xiao-Dan Wang,Xiao-Hong Chen,Ce-Hui Mo,Yan-Wen Li,Hui Li,Quan-Ying Cai,Dong-Mei Zhou,Ming-Hung Wong,Qing X. Li
Di-n-butyl phthalate (DBP) is a prevalent pollutant in agricultural soils due to use of plastic film. This study focused on sorption mechanism, kinetics, and isotherms of DBP to six paddy soil particle-size fractions (i.e., coarse sand, fine sand, coarse silt, fine silt, clay, and humic acid fractions). DBP sorption involved in both boundary layer diffusion and intraparticle diffusion, following pseudo-second-order kinetics. DBP sorption was a spontaneous physical process, which fit the Freundlich model. Hydrophobic and ionic interaction relevant to the organic matter content, cation exchange capacity, surface area, and pore volume of soil fractions played key roles in DBP sorption. DBP was strongly adsorbed to humic acid and the sorption was reversely associated with soil particle sizes. DBP may exhibit higher mobility and bioavailability in a soil-crop system at lower temperature (15 °C), due to the lower log Koc values.
研究领域:
环境科学
·
土壤学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Ji-Hao Zuo,Zhong-Kun Li,Chao Wei,Xi Yan,Yan Chen,Wan-Zhong Lang
The PVDF membranes were prepared via thermally induced phase separation (TIPS) method with saline water as quenching bath and applied to the separation of oil/water emulsions. Surface pore size, permeation performance and other properties of the PVDF membranes were finely tuned by adjusting salt concentration in quenching bath. The results show that with the addition of NaCl in quenching bath, the thermal transfer resistance increases in the TIPS process due to the obvious increase of bath viscosity and the slight decline of thermal conductivity of saline solution. All the PVDF membranes present bi-continuously fibrillar structure in top surfaces. The fibrils are fused together and get thicker, and leads to rougher top surfaces due to the decline of cooling rate with the addition of NaCl in quenching bath. At the same time, the PVDF membranes exhibit expanded pore size and higher permeation flux for both pure water and oil/emulsions. The PVDF membrane of S20 (prepared with 20 wt% NaCl aqueous solution as quenching bath) exhibits the largest mean pore size and the highest pure water permeation flux of 2481.1 L m −2 h −1 bar −1 . However, overhigh NaCl content leads to the inverse trend. For example, the PVDF membrane of S30 (quenching bath containing 30 wt% NaCl) exhibits a lightly decreased pore size and pure water permeation flux compared to S20. All of the PVDF membranes exhibit good oil rejections above 90.0% for surfactant-stabilized oil-in-water emulsions and above 95.0% for surfactant-free oil-in-water emulsions.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2019
·
IF 7.466
Xiao You,Jinshan Yang,Kai Huang,Mengmeng Wang,Xiangyu Zhang,Shaoming Dong
Herein, we describe the synthesis of multifunctional silicon carbide matrix composites by the in-situ growth of SiC in three-dimensionally printed graphene scaffolds by chemical vapor infiltration (CVI). Graphene-based scaffolds with various graphene contents, which are first assembled by three-dimensional (3D) printing, exhibit good adhesion and interlayer bonding. The content and morphology of the SiC matrix in the composite is controlled by optimizing the values of the CVI parameters, such as the holding time and gas pressure. The 3D graphene/SiC multifunctional composites exhibit outstanding mechanical performance, delivering a maximum compressive strength of 193 ± 15.7 MPa, which is 394% higher than that of the directly mixed product. The toughening mechanism induced by the graphene sheets , including pull-out and crack deflection, are clearly observed. The combination of 3D graphene scaffold and SiC matrix generates a larger number of conductive channels and provides a material that outperforms traditional ceramic materials in terms of electrical conductivity . It is expected that high-performance 3D graphene reinforced ceramic matrix composites with structural and functional integration will be prepared by introducing ceramic matrices into 3D graphene scaffolds.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Consumer Protection and Food Safety
·
2019
·Vol. 15
·期 2
·135-143
·
IF 0.641
Yuan Hui,Hao Qian,Su Rongxin,Qi Wei,He Zhimin
Phthalates (PAEs) are used as plasticizer for producing food contact materials. However, PAEs can contaminate foodstuff through chemical migration and present serious environmental concerns. This study aims to investigate the migration of five common PAEs (diethyl phthalate, diisobutyl phthalate, dibutyl phthalate, butyl benzyl phthalate, and di(2-ethylhexyl)phthalate) from polyvinyl chloride into fatty food simulants ( n -hexane, isooctane, and 95% ethanol). The migration levels of the five PAEs into different food simulants were compared after reaching equilibrium with the plastic additive. The migration rate was higher when the molar mass was lower, whereas K o/w and the migration temperature were higher. Key parameters (diffusion and partition coefficients) of the migration processes were calculated and compared at different temperatures using a mathematical model based on Fick’s second law. The diffusion coefficients ranged from 1.08 × 10 −11 cm 2 /s to 5.50 × 10 −10 cm 2 /s at 60 °C, 2.46 × 10 −13 cm 2 /s to 3.61 × 10 −11 cm 2 /s at 40 °C, and 8.30 × 10 −14 cm 2 /s to 3.60 × 10 −12 cm 2 /s at 20 °C. The diffusion coefficients well fit the Arrhenius relationship in the range of 20–60 °C.
研究领域:
食品安全
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACTA BIOCHIMICA ET BIOPHYSICA SINICA
·
2020
·Vol. 52
·期 12
·1382-1393
·
IF 2.836
Xiong Ze,Zeng Yuyao,Zhou Jiafeng,Shu Ruonan,Xie Xiaoxian,Fu Zhengwei
Dibutyl phthalate (DBP), a kind of typical environmental pollutant, is widely used as plasticizers, and its neurotoxicity and developmental toxicity have been found in recent years. However, whether oral DBP exposure will affect the homeostasis of gut microbiota and its adverse response in liver of mammalians remain unclear. In the present study, 10-week experimental cycles of vehicle or DBP (0.1 and 1 mg/kg) were given to 6-week-old C57BL/6J mice by oral gavage. Our results revealed that the body weight of mice was increased after exposure to both low and high doses of DBP. The serum levels of hepatic triglyceride and total cholesterol were significantly increased in response to both doses of DBP. In addition, some pivotal genes related to lipogenesis were also increased in liver at the mRNA level. Evaluation of gut microbiota by 16S rRNA sequencing technology showed that 0.1 mg/kg DBP exposure significantly affected gut microbiota at the phylum and genus levels. Moreover, DBP exposure decreased mucus secretion and caused inflammation in the gut, leading to the impairment of intestinal barrier function. Exposure to DBP inhibited the expression of peroxisome proliferator-activated receptor-γ and activated the expression of nuclear factor kappa B. In addition, DBP exposure increased the level of lipopolysaccharide in serum, and increased the expression of toll-like receptor 4 and the levels of inflammatory cytokines, such as interleukin (IL)-1β, IL-6, and tumor necrosis factor alpha, in the liver. These results indicated that exposure to DBP disturbed the homeostasis of gut microbiota, induced hepatic lipid metabolism disorder, and caused liver inflammation in mice via the related gut–liver axis signaling pathways.
研究领域:
毒理学
·
微生物学
·
肝病学
·
免疫学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Xuejun Wang,Hao Wu,Xiaoyu Wang,Haixia Wang,Kankan Zhao,Bin Ma,Zhenmei Lu
Dibutyl phthalate (DBP), widely used as plasticizer , is a typical soil contaminant. A new isolate, Arthrobacter nicotianae ZM05, is efficient at degrading DBP but lacks stress resistance to adverse environments. In this study, to isolate effective cooperators of strain ZM05 under pH stress and explore the effects of DBP on the bacterial community structure and interaction between bacteria, a microcosm experiment was conducted by supplying the exogenous DBP-degrading bacteria ZM05. 16S rRNA gene sequencing analysis showed that DBP contamination decreased microbial community diversity and weakened potential interactions between microorganisms , evidenced by fewer links, lower average degree, and lower average clustering coefficients in the cooccurrence network. Furthermore, the subnetworks showed that DBP shifted the interactions between strain ZM05 and other microbes. Based on the prediction of the network, the nondegrading bacterium Pseudomonas aeruginosa ZM03 was isolated and proven through coculture experiments to have a positive interaction with strain ZM05 during DBP degradation under pH stress. Strain ZM03 could utilize downstream acidic metabolites to alleviate acid inhibition and accelerate degradation. This study provides solid evidence that bacterial communities adjust their interactions to adapt to DBP stress and provides new insight into the prediction of microbes that are cooperative with degrading bacteria.
研究领域:
环境科学
·
微生物学
✓ 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）