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1.
Chemosphere ; 270: 128664, 2021 May.
Artigo em Inglês | MEDLINE | ID: mdl-33757276

RESUMO

Bisphenol A (BPA) is one of the widely detected endocrine disrupting chemicals in coastal sediment. Biodegradation is a vital pathway of BPA elimination in sediment. However, the impact of vegetation on BPA degradation in coastal sediment is still unclear. In this study, the differences of BPA biodegradation and the functional microbial community and metabolic pathway were explored between mangrove forest and mudflat sediments. A nearly complete BPA attenuation was detected in 4 days in mudflat sediment but 8 days in forest sediment. Bacterial abundance varied greatly in different sediment types. Bacterial community structure changed with BPA biodegradation, dependent on sediment type. During the degradation, the proportions of Alphaproteobacteria and Gammaproteobacteria were higher in BPA amended microcosms than in un-amended microcosms. With BPA biodegradation, a substantial increase in Novosphingobium and Croceicoccus occurred in forest sediment and mudflat sediment, respectively. Additionally, two divergent BPA biodegradation pathways were proposed based on functional annotation and KEGG pathway database. The abundance of functional genes also varied with BPA biodegradation, dependent on sediment type. Gene pcaGH decreased, while genes ligK and pcaD increased in both sediment types. Gene pcaB showed a remarkable increase in forest sediment but a decrease in mudflat sediment. Therefore, BPA degradation and the associated microbial community and metabolic pathway differed between mudflat and mangrove forest sediments.


Assuntos
Poluentes Químicos da Água , Áreas Alagadas , Compostos Benzidrílicos/análise , Biodegradação Ambiental , Sedimentos Geológicos , Fenóis , Poluentes Químicos da Água/análise
2.
Sci Total Environ ; 770: 145296, 2021 May 20.
Artigo em Inglês | MEDLINE | ID: mdl-33736423

RESUMO

A solar-driven advanced oxidation process at a lab scale was studied for the degradation and mineralization of the known endocrine disrupting chemical (EDC), bisphenol A (BPA). Preliminary tests were performed varying the irradiation source, BPA/H2O2 ratio, temperature, initial H2O2 concentration, initial solution pH, and initial BPA concentration, then, the operational conditions of the UV-solar/H2O2 were optimized by a response surface methodology (RSM), providing the following responses: UV-solar/H2O2 process at pH 3.0, [BPA]0 = 25 mg L-1, [H2O2] = 350 mg L-1, T = 50 °C, achieving BPA degradation of 77.4% and BPA mineralization of 38.2%, H2O2 consumption of 230 mg L-1. From the optimized condition, different pH ranges were tested (3.0; 5.0; 7.0; 9.0; and 11.0), where, at solution pH 5.0 the best removal rates were achieved (89.2% BPA degradation and 49.0% BPA mineralization). The BPA amount in solution was monitored by High Performance Liquid Chromatography (HPLC) and a study of the intermediate reaction by-products was performed by Gas Chromatography-Mass Spectrometry (GC-MS) analyses, highlighting the lower amount of by-products identified when the solution pH 5.0 was employed, rather than the solution pH 3.0. Genotoxicity tests with Zebrafish (Danio rerio) and cytotoxicity tests with Allium cepa were performed aiming to evaluate errors in the cells and nuclear abnormalities of the tested organisms induced by BPA raw samples, as well as by the BPA samples treated by the UV-solar/H2O2 process. Therefore, the bio-toxicity levels for an animal and a vegetal bio-indicator were reduced by applying a renewable source of energy as the irradiation source for the UV/H2O2 process, representing an efficient and eco-friendly alternative for BPA treatment in aqueous solutions.


Assuntos
Disruptores Endócrinos , Poluentes Químicos da Água , Compostos Benzidrílicos/análise , Compostos Benzidrílicos/toxicidade , Disruptores Endócrinos/análise , Disruptores Endócrinos/toxicidade , Peróxido de Hidrogênio , Oxirredução , Estresse Oxidativo , Fenóis , Raios Ultravioleta , Poluentes Químicos da Água/análise , Poluentes Químicos da Água/toxicidade
3.
Food Chem ; 352: 129313, 2021 Aug 01.
Artigo em Inglês | MEDLINE | ID: mdl-33657480

RESUMO

Quantitative analysis of complex mixtures is a great challenge for spectral analysis. Bisphenol A (BpA) is a chemical predominantly used in manufacturing and is being replaced by other analogs due to its potential toxicity. Reliability methods is hence crucial for identification and quantification of bisphenol mixtures. In this study we present an attractive strategy for composition determination of BpA incorporated in its analogue mixtures. Terahertz spectra of four bisphenol components are analyzed using machine learning method (SVR) to learn the underlying model of the frequency against the target concentration of BpA in mixtures. The learned mode predicts the concentrations of the unknown samples with decision coefficient R2 = 0.98. Absorption spectra for bisphenols mixtures were successfully reconstructed by a hold-out validation scheme. The results indicate the terahertz spectroscopy in combination with SVR is robust and accurate in mixture quantitative analysis and should play a significant role for industrial applications in the future.


Assuntos
Compostos Benzidrílicos/análise , Aprendizado de Máquina , Fenóis/análise , Espectroscopia Terahertz , Reprodutibilidade dos Testes
4.
Environ Pollut ; 276: 116697, 2021 May 01.
Artigo em Inglês | MEDLINE | ID: mdl-33611200

RESUMO

Hooghly River (HR), the other name used for the lower stretch of River Ganga, is a prime freshwater source in the eastern part of India. However HR has been evidenced with a variety of emerging organic pollutants (EOPs) in the recent past. Given the extensive use of plasticizers and additive in plastic products, we have investigated seven plasticizers and bisphenol A (BPA) in the surface and storm-water of HR up to the tip of the Bay of Bengal. Further using a previously published sediment data we have estimated the fluxes for the aforementioned EOPs. Surface water and storm-water concentrations of seven plasticizers varied between 92.62 and 770 ng/L (176.1 ± 104.8; Avg ± SD) and 120.9-781.5 ng/L (355.2 ± 232.5), respectively. BPA varied between 43 and 8800 ng/L (658.3 ng/L ± 1760) and 117.9-2147 ng/L (459.3 ± 620.2) in surface and storm-water, respectively. With the increase in salinity, a decreasing trend for bis-(2-ethylhexyl) phthalate (DEHP) was evidenced. However, concentration of BPA increased with the increase in salinity. Significant and strong correlation between DEHP and BPA (R2 = 0.6; p < 0.01) in the suburban corridor might have resulted from sludge disposal of the scrap recycling activities. Using site-specific principal component analysis, unregulated disposal of plastic waste, particularly from such industrial belts and tourist spots were identified as the possible point sources for plasticizers and BPA in this region. Net diffusive flux based on fugacity fraction showed a trend depending on the pollutant's aqueous solubility and partition coefficient. However, transfer tendency from water to sediment was noticed in the sites having point source. Estimated ecotoxicological risk posed by BPA was higher for edible fishes and for lower order organisms, PAEs was the major contributor.


Assuntos
Poluentes Ambientais , Ácidos Ftálicos , Poluentes Químicos da Água , Baías , Compostos Benzidrílicos/análise , Monitoramento Ambiental , Índia , Fenóis , Ácidos Ftálicos/análise , Plastificantes/análise , Rios , Poluentes Químicos da Água/análise
5.
Chemosphere ; 271: 129786, 2021 May.
Artigo em Inglês | MEDLINE | ID: mdl-33548857

RESUMO

High rate algal ponds (HRAP) are an alternative to conventional wastewater treatment with the potential for wastewater and biomass reuse. In this study, we report the development and validation of methods for analysing 18 bisphenols (BPs) in the aqueous and biomass phase of HRAP. For aqueous phase samples, obtained LLOQ ranged from 10 to 30 ng/L, and recoveries from 78% to 106%. The relative expanded uncertainty was highest at the lowest spiking level (100 ng/L) and ranged from 27% to 66% (BPA), while for the biomass, the LLOQ ranged from 25 to 75 ng/g dw, recoveries from 84% to 103%. The uncertainty ranged from 16% to 37% (BPA). On average, the influent contained 329, 144, and 21 ng/L of BPA, BPS and 4,4'-BPF, and the effluent 69 ng/L, 94 ng/L and

Assuntos
Tanques , Purificação da Água , Compostos Benzidrílicos/análise , Biomassa , Eliminação de Resíduos Líquidos , Águas Residuárias
6.
J Prev Med Public Health ; 54(1): 37-45, 2021 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-33618498

RESUMO

OBJECTIVES: Bisphenol A (BPA) is used in the electrical, mechanical, medical, and food industries. Previous studies have suggested that BPA is an endocrine disruptor. Regulation of BPA has led to increased use of bisphenol F (BPF) and bisphenol S (BPS). However, few studies have investigated the associations of BPF and BPS with thyroid dysfunction in children. Our study investigated the associations of prenatal BPA and early childhood BPA, BPF, and BPS exposure with thyroid function in 6-year-old children. METHODS: Prenatal BPA concentrations were measured during the second trimester of pregnancy in an established prospective birth cohort. We measured urinary BPA, BPF, and BPS concentrations and thyroid hormone levels (thyroid-stimulating hormone, total T3, and free T4) in 6-year-old children (n=574). We examined the associations between urinary bisphenol concentrations and percentage change of thyroid hormone concentrations using multivariate linear regression. We also compared thyroid hormone levels by dividing the cohort according to BPA, BPF, and BPS concentrations. RESULTS: The associations between prenatal BPA and total T3 levels were statistically significant in all models, except for girls when using a crude model. The associations between urinary BPA and BPS concentrations and levels of all thyroid hormones were not statistically significant. However, we observed that lower free T4 levels (-1.94%; 95% confidence interval, -3.82 to -0.03) were associated with higher urinary BPF concentrations in girls only. CONCLUSIONS: Our findings identified significant associations between prenatal BPA exposure and total T3 levels in all children and between BPF exposure and free T4 levels in girls only.


Assuntos
Compostos Benzidrílicos/análise , Fenóis/análise , Sulfonas/análise , Hormônios Tireóideos/análise , Compostos Benzidrílicos/urina , Criança , Estudos de Coortes , Feminino , Humanos , Masculino , Fenóis/urina , Estudos Prospectivos , República da Coreia , Sulfonas/urina , Hormônios Tireóideos/sangue
7.
Mar Pollut Bull ; 164: 112090, 2021 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-33529876

RESUMO

The occurrence and spatial distribution of bisphenol A (BPA) and analogues bisphenol B (BPB), bisphenol F (BPF) and bisphenol S (BPS) were investigated in microplastic on 11 beaches in Hong Kong. At 10 sites, BPA was the only detected chemical with concentrations ranged from 82.4-989 ng g-1 microplastic. BPA, BPB and BPS co-occurred at only one site, where it is located close proximity to the outfall of a sewage treatment plant. There was no significant spatial difference of BPA concentrations in microplastic when all the sites were considered, indicating that some remote and presumably cleaner beaches have been contaminated. PE, PP and PS (represented >90% of total polymers) were the most dominated polymers, but there was no correlation between polymer types and BPA concentrations. No evidence was found that the BPA and its analogues accumulate on microplastic since the concentrations were comparable to those found in the sediment.


Assuntos
Microplásticos , Plásticos , Compostos Benzidrílicos/análise , Hong Kong , Fenóis
8.
Artigo em Inglês | MEDLINE | ID: mdl-33477860

RESUMO

Bisphenol A (BPA) is a typical endocrine disruptor that causes problems in waters all around the world. In this study, the effects of submerged macrophytes (Ceratophyllum demersum and Myriophyllum spicatum) cultured in vitro on the removal of BPA at two initial concentrations (0.5 mg L-1 vs. 5.0 mg L-1) from Donghu lake water were investigated, using different biomass densities (2 g L-1 vs. 10 g L-1) under different nutrient conditions (1.85 mg L-1 and 0.039 mg L-1 vs. 8.04 mg L-1 and 0.175 mg L-1 of the total nitrogen and phosphorus concentration, respectively), together with the effect of indigenous microorganisms in the water. The results showed that indigenous microorganisms had limited capacity for BPA removal, especially at higher BPA initial concentration when its removal rate amounted to about 12% in 12 days. Addition with plant seedlings (5 cm in length) greatly enhanced the BPA removal, which reached 100% and over 50% at low and high BPA initial concentration in 3 days, respectively. Higher biomass density greatly favored the process, resulting in 100% of BPA removal at high BPA initial concentration in 3 days. However, increases in nutrient availability had little effect on the BPA removal by plants. BPA at 10.0 mg L-1 significantly inhibited the growth of M. spicatum. Therefore, C. demersum may be a candidate for phytoremediation due to greater efficiency for BPA removal and tolerance to BPA pollution. Overall, seedlings of submerged macrophytes from in vitro culture showed great potential for use in phytoremediation of BPA in natural waters, especially C. demersum.


Assuntos
Compostos Benzidrílicos/metabolismo , Biodegradação Ambiental , Lagos/química , Fenóis/metabolismo , Poluentes Químicos da Água/metabolismo , Compostos Benzidrílicos/análise , Humanos , Fenóis/análise , Plântula , Água , Poluentes Químicos da Água/análise
9.
Food Chem ; 348: 129106, 2021 Jun 30.
Artigo em Inglês | MEDLINE | ID: mdl-33516999

RESUMO

Deep eutectic solvents (DESs) are a new class of green "designer solvent"; its physicochemical properties can be easily tuned by adjusting DES' constituents, chemical ratio and water content. In this study, three hydrophobic DESs with low viscosity, low density, and melting points close to room temperature were designed and synthesized. Based on these DESs, an air-assisted liquid-liquid microextraction technique was developed based on the solidification of floating DESs for the simultaneous determination of bisphenols and polycyclic aromatic hydrocarbons (PAHs) via HPLC. The microextraction parameters were optimized via the Plackett-Burman design and response surface methodologies. The method shows satisfactory linearity (R2 ≥ 0.9928), a low limit of detection (0.16-0.75 µg L-1) and satisfactory precision (≤2.3%), and was successfully applied for the simultaneous determination of bisphenols and PAHs from tea infusions with satisfactory recoveries (82.0-116.6%). This method is simple, rapid, economical, environmentally compatible, dispersive solvent-frees and centrifugation-free, and has promising applications in food safety.


Assuntos
Ar , Compostos Benzidrílicos/análise , Microextração em Fase Líquida/métodos , Fenóis/análise , Hidrocarbonetos Policíclicos Aromáticos/análise , Solventes/química , Chá/química , Água/química , Compostos Benzidrílicos/química , Compostos Benzidrílicos/isolamento & purificação , Cromatografia Líquida de Alta Pressão , Análise de Alimentos , Contaminação de Alimentos/análise , Interações Hidrofóbicas e Hidrofílicas , Limite de Detecção , Fenóis/química , Fenóis/isolamento & purificação , Fenômenos Físicos , Hidrocarbonetos Policíclicos Aromáticos/química , Hidrocarbonetos Policíclicos Aromáticos/isolamento & purificação , Viscosidade , Poluentes Químicos da Água/análise
10.
Food Chem ; 346: 128895, 2021 Jun 01.
Artigo em Inglês | MEDLINE | ID: mdl-33421902

RESUMO

Bisphenols (BPs) are worldwide used organic compounds in plastics, belonging to the group of endocrine disrupting chemicals (EDCs) which exhibits endocrine disruption to beings. Migration of BPs from food contact materials like plastic containers, epoxy coatings in metal cans and thermal papers, would results in bioaccumulation of BPs in human beings, causing adverse health effects. Therefore, sensitive and selective determination of BPs in food is needed. Among different strategies have been explored for the detection of BPs, electrochemical sensors with relatively high sensitivity and fast response are promising. This paper is devoted to comprehensively review the developed electrochemical methods for BPs sensing in food, so that to find a direction for developing low cost, high accuracy and compatibility sensors toward the sensitive and selective detection of BPs. Different electrochemical technologies categorized by recognition agents, aptamers, enzymes, molecularly imprinted polymers and nanomaterials are discussed and summarized in their mechanisms, usages, merits and limitations. The challenges and further perspectives in the development of electrochemical sensors is also discussed.


Assuntos
Compostos Benzidrílicos/análise , Eletroquímica/métodos , Análise de Alimentos/métodos , Fenóis/análise , Disruptores Endócrinos/análise , Contaminação de Alimentos/análise , Humanos , Nanoestruturas/química
11.
Mar Pollut Bull ; 163: 111931, 2021 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-33418343

RESUMO

Endocrine disrupting compounds (EDCs) in marine environments has become a major environmental concern. Nonetheless, the biological effects of EDCs on organisms in coastal environments remain poorly characterized. In this study, biomonitoring of EDCs in male fish Sebastiscus marmoratus was carried out in the Maowei Sea, China. The results showed that the concentration of 4-nonylphenol (4-NP) was below the detection limit, the concentrations of 4-tert-octylphenol (4-t-OP) and bisphenol A (BPA) in seawater were moderate compared with those in other global regions, and the possible sources are the municipal wastewater discharge. Nested ANOVA analyses suggest significant differences of the brain aromatase activities and plasma vitellogenin (VTG) expression between the port area and the oyster farming area. A new fish expert system (FES) was developed for evaluating the biological effects of EDCs on fish. Our findings show that the FES is a potential tool to evaluate the biological effects of marine pollutants.


Assuntos
Disruptores Endócrinos , Perciformes , Poluentes Químicos da Água , Animais , Compostos Benzidrílicos/análise , Compostos Benzidrílicos/toxicidade , China , Disruptores Endócrinos/análise , Disruptores Endócrinos/toxicidade , Monitoramento Ambiental , Masculino , Poluentes Químicos da Água/análise , Poluentes Químicos da Água/toxicidade
12.
J Chromatogr A ; 1638: 461886, 2021 Feb 08.
Artigo em Inglês | MEDLINE | ID: mdl-33465586

RESUMO

Major type of internal can coating used for food and beverages is made from epoxy resins, which contain among their components bisphenol A (BPA) or bisphenol A diglycidyl ether (BADGE). These components can be released and contaminate the food or beverage. There is no specific European legislation for coatings, but there is legislation on specific substances setting migration limits. Many investigations have paid attention to BPA due to its classification as endocrine disruptor, however, few studies are available concerning to other bisphenol analogues that have been used in the manufacture of these resins. To evaluate the presence of this family of compounds, ten cans of beverages were taken as study samples. Firstly, the type of coating was verified using an attenuated total reflectance-FTIR spectrometer to check the type of coating presents in most of the samples examined. A screening method was also performed to investigate potential volatiles from polymeric can coatings of beverages using Purge and Trap (P&T) technique coupled to gas chromatography with mass spectrometry detection (GC-MS). Moreover, a selective analytical method based on high performance liquid chromatography with fluorescence detection (HPLC-FLD) for the simultaneous identification and quantification of thirteen compounds including bisphenol analogues (BPA, BPB, BPC, BPE, BPF, BPG) and BADGEs (BADGE, BADGE.H2O, BADGE.2H2O, BADGE.HCl, BADGE.2HCl, BADGE.H2O.HCl, cyclo-di-BADGE) in the polymeric can coatings and in the beverage samples was applied. In addition, a liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS) method was optimized for confirmation purposes. The method showed an adequate linearity (R2 >0.9994) and low detection levels down to 5 µg/L. Cyclo-di-BADGE was detected in all extracts of polymeric coatings. The concentrations ranged from 0.004 to 0.60 mg/dm2. No detectable amounts of bisphenol related compounds were found in any of the beverage samples at levels that may pose a risk to human health, suggesting a low intake of bisphenols from beverages.


Assuntos
Bebidas/análise , Cromatografia/métodos , Polímeros/química , Compostos Benzidrílicos/análise , Compostos Benzidrílicos/química , Dieta , Compostos de Epóxi/química , Resinas Epóxi/química , Cromatografia Gasosa-Espectrometria de Massas , Humanos , Fenóis/análise , Padrões de Referência , Reprodutibilidade dos Testes , Espectrofotometria Infravermelho , Espectroscopia de Infravermelho com Transformada de Fourier , Volatilização
13.
Sci Total Environ ; 767: 144286, 2021 May 01.
Artigo em Inglês | MEDLINE | ID: mdl-33429266

RESUMO

Ecosystems are facing increased pressure due to the emission of many classes of emerging contaminants. However, very little is known about the interactions of these pollutants, such as bisphenols (BPs), plasticizers or pharmaceuticals. By employing bioluminescent bacteria (Microtox assay), we were able to define interactions between selected emerging pollutants (namely BPA, BPS, BPF, BADGE, BADGE·2HCl, DEP, DBP) in ternary mixtures, at environmentally relevant concentration levels (down to as low as 1.89, 1.42, 3.08, and 0.326 µM for, respectively, BPA, BPF, BPS and BADGE·2HCl). We provide the first systematic analysis of bisphenols and phthalates in three component mixtures. Using this system, we performed toxicity modelling with concentration addition (CA) and independent action (IA) approaches, followed by data interpretation using Model Deviation Ratio (MDR) evaluation. Interestingly, we mathematically and experimentally confirmed a novel synergy between BPA, BADGE and BADGE·2HCl. The synergy of BPA, BADGE and BADGE·2HCl is distinct, with both models suggesting these analytes have a similar mode of action (MOA). Moreover, we unexpectedly found a strong antagonistic impact with DEP, in mixtures containing BPA and BADGE analogues, which is confirmed with both mathematical models. Our study also shows that the impact of BPS and BPF in many mixtures is highly concentration dependent, justifying the necessity to perform mixture studies using wide concentration ranges. Overall, this study demonstrates that bioluminescent bacteria are a relevant model for detecting the synergistic and antagonist actions of environmental pollutants in mixtures, and highlights the importance of analyzing combinations of pollutants in higher order mixtures.


Assuntos
Poluentes Ambientais , Compostos Benzidrílicos/análise , Bioensaio , Ecossistema , Poluentes Ambientais/toxicidade , Plastificantes
14.
Food Chem ; 346: 128975, 2021 Jun 01.
Artigo em Inglês | MEDLINE | ID: mdl-33429296

RESUMO

As bisphenol A (BPA) is harmful to human health, it is of great significance to develop a new method for BPA detection. Herein, we designed a BPA biosensor by integrating an amplifying DNA circuit with Mg2+-dependent DNAzyme into the sensing system. The BPA-aptamer binding activated a DNA circuit for signal amplification based on toehold-mediated strand displacement. A catalytic Mg2+-dependent DNAzyme was formed through synergistically DNA hybridization, which can cleave the dual-labeled substrate DNA into two segments. The separation of the fluorophore and quencher produces a high fluorescence response for BPA detection. This biosensor exhibited a superior sensitivity with a detection limit of 50 fM. The method is selective and robust, which can work even in milk samples with satisfactory accuracy. The biosensor analytical results were also verified by liquid chromatography coupled with mass spectrometry (LC-MS) and no obvious difference existed between the two methods.


Assuntos
Compostos Benzidrílicos/análise , Técnicas Biossensoriais/métodos , DNA Catalítico/química , Leite/química , Fenóis/análise , Animais , DNA/química , DNA/metabolismo , DNA Catalítico/metabolismo , Corantes Fluorescentes/química , Limite de Detecção , Magnésio/química , Técnicas de Amplificação de Ácido Nucleico , Hibridização de Ácido Nucleico , Espectrometria de Fluorescência
15.
Chemosphere ; 262: 128073, 2021 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-33182155

RESUMO

Due to the multi-catalysis of the WO3 and excellent properties of the graphene (GO), a series of rGO-WO3 nanocomposites were prepared through the hydrothermal synthesis procedure by changing the material ratio, the reaction temperature and the reaction time in this paper, and then added it into a dielectric barrier discharge plasma (DBDP) system for investigating the bisphenol A (BPA)'s degradation and corresponding catalytic mechanism of the rGO-WO3 in the DBDP system. The obtained results show that there was an optimum dosage of the rGO-WO3 (40 mg/L) as well as the preparation conditions (5:1000 mass ratio of the GO and the WO3, 18 h reaction time and 120 °C reaction temperature) for achieving the highest catalytic effect, and the highest degradation rate constant of the BPA was 0.03129 min-1. The determined higher TOC removal, higher COD removal as well as UV-Vis analysis also demonstrated the catalysis of the rGO-WO3. The measurement of the change of the O3 and the H2O2 concentrations in the reaction system with or without the rGO-WO3 and with or without the BPA proved the catalysis of the rGO-WO3 on the ·OH formation, while the combination of the GO had the positive effect for enhancing the catalytic effect. A figure on the catalysis and degradation procedure of the BPA in the DBDP/rGO-WO3 system was provided in the paper.


Assuntos
Compostos Benzidrílicos/análise , Grafite/química , Nanocompostos/química , Óxidos/química , Fenóis/análise , Tungstênio/química , Poluentes Químicos da Água/análise , Purificação da Água/métodos , Catálise , Peróxido de Hidrogênio/química , Modelos Teóricos , Oxirredução , Ozônio/química
16.
Food Chem ; 345: 128627, 2021 May 30.
Artigo em Inglês | MEDLINE | ID: mdl-33348135

RESUMO

Current study is focusing mainly on the development of simple, novel, and cost-effective optical sensor to detect and quantify Bisphenol A (BPA) contamination. We designed a very selective and sensitive colorimetric sensor using synthesized 3', 6'- bis(diethylamino) -2- ((3,4,5 trimethyl benzylidene) amino)spiro [isoindoline-1,9'-xanthen] -3-one (BTSIXO) conjugated with Fe3+-ions via very simple eco- friendly synthetic protocol. The sensor has an excellent wide detection range for BPA from 0.1 to 150 ppm with LODs of 0.02 ppm. Finally, the applicability of the sensor was demonstrated in fish samples especially in the organs of Oreochromis mossambicus fingerlings and contaminated industrial water samples. The sensor was also applied for the quantification of BPA present drinking water stored in the plastic bottles. The developed sensor has shown a good agreement and accuracy when compared with ESI-Mass techniques.


Assuntos
Compostos Benzidrílicos/análise , Bioacumulação , Colorimetria/métodos , Peixes , Ferro/química , Compostos Organometálicos/química , Fenóis/análise , Compostos de Espiro/química , Animais , Compostos Benzidrílicos/metabolismo , Colorimetria/economia , Análise Custo-Benefício , Contaminação de Alimentos/análise , Limite de Detecção , Fenóis/metabolismo , Fatores de Tempo , Água/química
17.
Food Chem ; 345: 128841, 2021 May 30.
Artigo em Inglês | MEDLINE | ID: mdl-33360062

RESUMO

In this study, a novel porous composite (Fe3O4@TAPB-COF@ZIF-8) consisting of metal-organic and covalent organic frameworks was developed and applied to the magnetic solid-phase extraction (MSPE) of bisphenols. The extraction parameters such as the extraction time, solution pH, amounts of adsorbent, and ionic strength were investigated to obtain the best extraction conditions. By optimizing the MSPE, a convenient and sensitive analytical method was established in combination with high-performance liquid chromatography. The method achieved low detection limits (0.04-0.05 ng mL-1), wide linear range (0.25-1000 ng mL-1), good repeatability (1.20-4.30%), good reproducibility (1.34-4.03%), and satisfactory recoveries of four functional beverages (66.2-116.6%).


Assuntos
Compostos Benzidrílicos/análise , Compostos Benzidrílicos/isolamento & purificação , Bebidas/análise , Limite de Detecção , Fenômenos Magnéticos , Estruturas Metalorgânicas/química , Fenóis/análise , Fenóis/isolamento & purificação , Extração em Fase Sólida/métodos , Adsorção , Compostos Benzidrílicos/química , Cromatografia Líquida de Alta Pressão , Óxido Ferroso-Férrico/química , Concentração Osmolar , Fenóis/química , Porosidade , Reprodutibilidade dos Testes
18.
J Chromatogr A ; 1637: 461828, 2021 Jan 25.
Artigo em Inglês | MEDLINE | ID: mdl-33373795

RESUMO

A novel double-microextraction approach, combining dispersive liquid-liquid microextraction (DLLME) and vortex-assisted micro-solid-phase extraction (VA-µ-SPE) was developed. The procedure was applied to extract endocrine disrupting chemicals (EDCs) consisting of three phthalate esters (PEs) and bisphenol A (BPA) associated with PM2.5 (airborne particulate matter with aerodynamic diameter ≤ 2.5 µm). Gas chromatography-tandem mass spectrometry (GC-MS/MS) was used for determination of the analytes. These analytes were first ultrasonically desorbed from PM2.5 in a 10% acetone aqueous solution. DLLME was used to first preconcentrate the analytes; the sample solution, still in the same vial, was then subjected to VA-µ-SPE. The synergistic effects provided by the combination of the microextraction techniques provided advantages such as high enrichment factors and good cleanup performance. Various extraction parameters such as type and volume of extractant solvent (for DLLME), and type of sorbent, extraction time, desorption solvent, volume of desorption solvent and desorption time (for µ-SPE) were evaluated. Multi-walled carbon nanotubes were found to be the most suitable sorbent. This procedure achieved good precision with intra- and inter-day relative standard deviations of between 1.93 and 9.95%. Good linearity ranges (0.3-100 ng/mL and 0.5-100 ng/mL, depending on analytes), and limits of detection (LODs) of between 0.07 and 0.15 ng/mL were obtained. The method was used to determine the levels of PEs and BPA in ambient air, with concentrations ranging between below the limits of quantification and 0.48 ng/m3. DLLME-VA-µ-SPE-GC-MS/MS was demonstrated to be suitable for the determination of these EDCs present in PM2.5.


Assuntos
Compostos Benzidrílicos/isolamento & purificação , Disruptores Endócrinos/isolamento & purificação , Cromatografia Gasosa-Espectrometria de Massas/métodos , Material Particulado/isolamento & purificação , Fenóis/isolamento & purificação , Ácidos Ftálicos/isolamento & purificação , Espectrometria de Massas em Tandem/métodos , Compostos Benzidrílicos/análise , Disruptores Endócrinos/análise , Ésteres , Limite de Detecção , Nanotubos de Carbono/química , Material Particulado/análise , Fenóis/análise , Ácidos Ftálicos/análise , Reprodutibilidade dos Testes , Solventes/química
19.
Chemosphere ; 268: 129342, 2021 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-33352519

RESUMO

Recently, contamination of water resources with various organics such as bisphenols is a problem worldwide. Here, we developed nitrogen-enriched porous carbons (N-PDCs) from pyrolysis of melamine-loaded polyaniline (PANI), for the first time. The N-PDCs and PANI-derived carbons (PDCs, without using melamine) were characterized and applied in adsorptive removal of two typical bisphenols, such as bisphenol A and S (BPA and BPS, respectively), from water under a wide range of conditions. Via this research, we found that one N-PDC (N-PDC-700, obtained at 700 °C) showed very remarkable performances in adsorption of BPA (Q0: 961 mg/g) and BPS (Q0: 971 mg/g) under pH of 7.0. In other words, N-PDC-700 has Q0 value for BPS around 2 times as much as that of the most effective adsorbent, MIL-101-NH2. Moreover, the Q0 value of N-PDC-700 for BPA is the second highest, after the sp2 C dominant N-doped carbon. The plausible adsorption mechanism could be suggested based on the adsorption of BPA under a wide range of pH values. Finally, the N-PDC-700 was easily recycled for several uses, suggesting the potential application in adsorption of bisphenols from water.


Assuntos
Carbono , Poluentes Químicos da Água , Adsorção , Compostos de Anilina , Compostos Benzidrílicos/análise , Fenóis , Porosidade , Triazinas , Água , Poluentes Químicos da Água/análise
20.
Ecotoxicol Environ Saf ; 207: 111521, 2021 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-33254396

RESUMO

Phthalates (PAEs), bisphenol A (BPA), and oestrogenic compounds have become major concerns due to their endocrine-disrupting effect. However, few studies related to the occurrence of PAEs, BPA, and oestrogen in food and compost from different growth age livestock have been conducted. In this study, faeces, urine and food samples were collected from a typical livestock (cow) and a special livestock (pigeon) from concentrated animal feeding operations (CAFOs). The daily total oestrogen excretion of a single cow ranged from 192 µg/day to 671 µg/day, which was significantly higher than that of a single pigeon (0-0.01 µg/day). Conjugated oestrogens represented 22.0-46.0% of the total oestrogens excreted from cow faeces and 80.7-91.8% of those from cow urine, indicating that the form of the excreted oestrogens depends on the livestock species and type of excrement. BPA was all detected in all livestock manure and food, and the concentration in pigeon was 9.2-40.2 ng/g and 23.1 ng/g respectively, while that in cattle was 50.5-72.0 ng/g and 41.1 ng/g respectively. The results indicated that the food is significant sources of BPA entering the process of cow and pigeon breeding. Diethyl phthalate (DEP) was detected at high frequency in pigeon faeces samples, suggesting that pigeons were highly exposed to these plasticisers. The total oestradiol equivalent quantity (EEQt) of livestock origin in aquatic environments was estimated to be 2.99 ng/L, which was higher than the baseline hazard value (1 ng/L) (Xu et al., 2018). The study provides data on the emissions and sources of PAEs, BPA, and oestrogenic compounds from different livestock in CAFOs and demonstrates that food is a significant source of BPA entering livestock.


Assuntos
Ração Animal/análise , Compostos Benzidrílicos/análise , Poluentes Ambientais/análise , Estrogênios/análise , Contaminação de Alimentos/análise , Fenóis/análise , Ácidos Ftálicos/análise , Animais , Bovinos , China , Fezes/química , Feminino , Contaminação de Alimentos/estatística & dados numéricos , Humanos , Gado , Esterco/análise , Plastificantes
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