Chemical contaminants

Tue, 11/19/2019 - 03:33
Author(s): Isa Marmelo, Vera Barbosa, Ana Luísa Maulvault, Maria Paula Duarte, António MarquesAbstractDespite the bioaccessibility of nutrients and contaminants present in individual seafood products has been thoroughly studied, information is extremely limited in what concerns complete seafood-based meals, where interactions between ingredients may occur. Hence, this study aimed to evaluate the...
Tue, 11/19/2019 - 03:26
Experiments were conducted under lead (Pb), cadmium (Cd), and copper (Cu) exposure to observe germination and seedling growth of wheat (Triticum aestivum L), pea (Pisum sativum), and tomato (Solanum lycopersicum L.). Metals were applied in five concentrations (20, 65, 110, 175, and 220 ppm) and Hoagland solution was used to feed the seedlings. Irrespective of the tested crop seeds, copper...
Mon, 11/18/2019 - 03:33
Author(s): Wei-Yu Mu, Pu-Zhen Huang, Qiu-Yun Chen, Wei WangAbstractSimple and sensitive methods are required for the detection of melamine since melamine is harmful to human health. To detect the content of melamine and metal-melamine species in milk products, a new luminescent DNA silver hydrocolloid (AgNC53) was synthesized using a modified C3A-rich aptamer as the template. The emission of...
Mon, 11/18/2019 - 03:26
Soil contamination due to cadmium (Cd) is a ubiquitous environmental problem for which inexpensive remediation alternatives are required. Phytoaccumulation, the use of plants to extract and accumulate heavy metals from the contaminated environment, is such an alternative. In this study, we aimed at establishing effective plant-bacteria interplay between Brachiaria mutica and Cd-resistant...
Sat, 11/16/2019 - 03:37
by Yutaka Takaoka, Atsuko Takeuchi, Aki Sugano, Kenji Miura, Mika Ohta, Takashi Suzuki, Daisuke Kobayashi, Takuji Kimura, Juichi Sato, Nobutaro Ban, Hisahide Nishio, Toshiyuki Sakaeda UDP-glucuronosyltransferase 1A1 (UGT1A1) is an enzyme that is found in the endoplasmic reticulum membrane and can reportedly have a large number of amino acid substitutions that result in the reduction of...
Sat, 11/16/2019 - 03:26
During the summer of 2015, polycyclic aromatic hydrocarbons (PAHs) in the atmosphere were collected by passive air samplers in typical urban–rural fringe of Wuhan–Ezhou region, Central China. The results showed that 16 kinds of PAHs were ubiquitous with the concentrations of ∑16PAHs from 14.69 to 136.30 ng·m−3 and the mean concentration of 43.03 ng·m−3. Phenanthrene (Phe), fluoranthene (Fla) and...
Sat, 11/16/2019 - 03:26
In this study, a simple and reliable sample preparation method based on an efficient version of homogeneous liquid-liquid extraction combined with dispersive liquid-liquid microextraction solidification of floating organic drop has been introduced to analyze some pesticide residues in fruit and fruit juice samples with gas chromatography-flame ionization detection. Under the optimum experimental...
Sat, 11/16/2019 - 03:26
Many pesticides are used for pest control during oat production and storage, making necessary to employ multiclass methods for pesticide residue determination. In this work, an efficient QuEChERS method was established for multiresidue determination of 60 pesticides in oats by liquid chromatography with tandem mass spectrometry (LC-MS/MS). Different sorbents, such as chitosan, Forisil®, C18, PSA...
Sat, 11/16/2019 - 03:25
Throughout the US Food and Drug Administration’s routine monitoring of various juice samples for elemental contaminants, a limited number of samples exhibited unexpected behavior related to the arsenic content. Juice samples were subjected to total arsenic determination and those containing arsenic > 10 μg kg−1 were subjected to arsenic speciation analysis using FDA Elemental Analysis Manual (...
Sat, 11/16/2019 - 03:25
A method based on micellar liquid chromatography was developed to determine oxolinic acid, ciprofloxacin, enrofloxacin, and sarafloxacin in eggs and egg products. The antimicrobial drugs were obtained in a micellar solution which was directly injected. The analytes were resolved using a C18 column and a mobile phase of 0.05 M sodium dodecyl sulfate—7.5% 1-propanol—0.5% triethylamine, buffered at...
Fri, 11/15/2019 - 03:36
We report the complete genome sequence of cadmium-resistant Cellulomonas sp. strain Y8, isolated from farmland soil. The 4.5-Mbp genome contains 4,074 genes, with an approximate GC content of 75%. This work might help in understanding how strain Y8 survives under heavy metal stress.
Fri, 11/15/2019 - 03:32
Author(s): Yuting Chen, Yifan Wu, Weiwei Xiao, Hansi Jia, Hansruedi Glatt, Ming Shi, Yungang LiuAbstractPolychlorinated biphenyls (PCBs) are persistent organic pollutants and human carcinogens. It was reported that rat CYP1A1 and catfish CYP1A can hydroxylate 3,3',4,4',5-pentachlorobiphenyl (PCB 126) and 3,3',4,4'-tetrachlorobiphenyl (PCB 77), while potential roles of other CYP1 enzymes in the...
Fri, 11/15/2019 - 03:31
Author(s): Xia Zhao, Ling Chen, Hongrui Ma, Jianzhong Ma, Dangge GaoAbstractIn this paper, a process combining biodegradation and Fenton oxidation was proposed for the removal of polydiallyldimethylammonium chloride-acrylic-acrylamide-hydroxyethyl acrylate (PDM) in aqueous phase. Biodegradation of PDM was investigated in activated sludge systems, and the effects of the solution pH, mixed liquid...
Fri, 11/15/2019 - 03:26
Metacercariae of Clinostomum Leidy, 1856 are frequently encountered in freshwater fish. In 2015, a provisional species of Clinostomum in People’s Republic of China (PRC) was distinguished from C. complanatum (Rudolphi, 1819) in Europe based on divergent cytochrome c oxidase I (CO1). However, in subsequent studies in East Asia, the same divergent CO1 genotype was identified as C. complanatum....
Fri, 11/15/2019 - 03:25
We conducted exposure assessment using toenails from 20 fishermen living in Bodo City, a community of the Niger delta region in Nigeria. This community has been affected by over 4000 oil spills and environmental disasters. Fishing is the primary source of food and income for individuals in this community. Previous research in Bodo City found elevated metal levels in fish. Toenails were used as a...
Fri, 11/15/2019 - 03:25
Venoms are one of the most convergent of animal traits known, and encompass a much greater taxonomic and functional diversity than is commonly appreciated. This knowledge gap limits the potential of venom as a model trait in evolutionary biology. Here, we summarize the taxonomic and functional diversity of animal venoms and relate this to what is known about venom system morphology, venom...
Thu, 11/14/2019 - 03:27
Three types of molecularly imprinted solid phase microextraction fibers were fabricated through sol‐gel method using diazinon, parathion‐methyl and isocarbophos as templates, respectively, and assembled together to construct a multifiber for analysis of organophosphorus pesticides in complex matrices. The multifiber provided large extraction capacity and high imprinting factor up to 3.89. In...
Thu, 11/14/2019 - 03:25
Ethylenediaminetetraacetic acid disodium salt (EDTA) was selected among various eluents due to its highest removal efficiency for lead (Pb) (43.7%) and zinc (Zn) (57.1%) leaching from Pb–Zn contaminated soil by soil column experiment. Compared with newly prepared EDTA eluent, using recycled EDTA eluent can still leaching down 71.1% of Pb and 63.2% of Zn respectively, which showed the reusable...
Wed, 11/13/2019 - 03:37
by Marlene Belmar, Sharif Aly, Betsy M. Karle, Richard V. Pereira The objective of this study was to identify factors affecting the accuracy of four commercial tests for ceftiofur drug residue in milk samples from bulk tank waste milk (WM). WM samples were collected from 12 California dairy farms which were initially tested using liquid chromatography (LC-MS/MS) to confirm their negative status...
Wed, 11/13/2019 - 03:34
Author(s): Bille Laura, Crovato Stefania, Manfrin Amedeo, Dalla Pozza Manuela, Toson Marica, Franzago Eleonora, Pinto Anna, Mascarello Giulia, Muzzolon Orietta, Tosi Federica, Negroni Gianluigi, Cappi Gualberto, Obregon Pablo, Ravarotto Licia, Binato GiovanniAbstractPurposeof the present study was to evaluate the total Hg (THg) level in Billfish caught in the Western Central Atlantic and to...
Wed, 11/13/2019 - 03:31
Author(s): Hussain Mohammed Salem Ali Albar, Nadeem Ali, Syed Ali Musstjab Akber Shah Eqani, Nabil A. Alhakamy, Ehtisham Nazar, Muhammad Imtiaz Rashid, Khurram Shahzad, Iqbal Mohammad Ibrahim IsmailAbstractIn this study a number of heavy metals namely chromium (Cr), cadmium (Cd), zinc (Zn), barium (Ba), copper (Cu), manganese (Mn), cobalt (Co), rubidium (Rb), selenium (Se) are studied in the...
Wed, 11/13/2019 - 03:29
The identification of natural fractures and the wells they connect is crucial for the development of geological reservoirs because it may have an important impact on reservoir model construction and hydraulic fracture propagation. In this study we investigated the use of a novel data source, the microbial community composition in the reservoir formation fluids, for identification of interwell...
Tue, 11/12/2019 - 03:32
Author(s): Julian R. Golec, Brianna Hoge, James F. WalgenbachAbstractTetranychus urticae Koch management in many specialty crops relies on intensive pesticide use and has led to rapid evolution of acaricide-resistant populations. These concerns, along with public concern regarding conventional pesticide safety, has generated interest in the use of biopesticides for managing T. urticae....
Tue, 11/12/2019 - 03:26
Organochlorine pesticides (OCPs) have been used for many decades, both for the control of pests in agriculture and for the control of vectors of human and animal diseases. Several recent studies have reported significant concentrations of these compounds in multiple environmental substrates due to their persistence, as well as the effect they have on ecosystem health, human health, and wildlife...
Tue, 11/12/2019 - 03:26
Flumequine (FLU) is widely used as an antibiotic in the treatment and control of animal diseases, which may result in the presence of residues harmful to humans in food products of animal origin. A novel and fast biomimetic enzyme-linked immunosorbent assay (BELISA) was developed for the determination of FLU based on a molecularly imprinted polymer (MIP) as a selective affinity agent. With an...
Tue, 11/12/2019 - 03:26
The dissipation behaviour and left-over residues of Hexaconazole fungicide and Lambda-Cyhalothrin pesticide in potato plant and soil were analysed by gas chromatography mass spectrometry (GC-MS). At fortified levels of 10, 100 and 500 μg/kg, the recoveries of Lambda-Cyhalothrin and Hexaconazole were in the range 81.66–93.25% and 76.11–93.92% with standard deviations of 0.87–8.13% and 0.88–7.68%,...
Tue, 11/12/2019 - 03:26
The aim of this study was to investigate the impact of incorporating Walnut leaves (WL) and their biochars produced at three temperatures (200, 400, and 600 °C) on fractionation, availability and maize indices in a naturally calcareous highly contaminated soil of Central Iran. A pot experiment was conducted considering soils treated with 0, 0.5, 1, and 2% (w/w) of WL and their derived biochars....
Mon, 11/11/2019 - 03:35
Author(s): P. Quintanilla, M. Cornacchini, M.I. Hernando, M.P. Molina, I. EscricheAbstractThis study evaluated instrumental parameters (chemical composition, colour, texture and microstructure) and sensory characteristics of goat cheese (60-day maturation) made with milk spiked with oxytetracycline at different levels: 0, 50, 100 (maximum residue limit; MRL) and 200 μg kg-1. Additionally, the...
Mon, 11/11/2019 - 03:33
Author(s): Jana Tulinska, Vlasta Masanova, Aurelia Liskova, Miroslava Lehotska Mikusova, Eva Rollerova, Zora Krivosikova, Kornelia Stefikova, Iveta Uhnakova, Monika Ursinyova, Janka Babickova, Andrea Babelova, Milena Busova, Lubomira Tothova, Ladislava Wsolova, Maria Dusinska, Martin Sojka, Mira Horvathova, Radka Alacova, Zbynek Vecera, Pavel MikuskaAbstractDue to the growing number of...
Mon, 11/11/2019 - 03:33
Author(s): Pei Wang, Min Zou, Dandan Li, Yulin Zhou, Dong Jiang, Runqiang Yang, Zhenxin GuAbstractTo elucidate the underlying mechanism of thermal-induced polymerization process of frozen-stored gluten, the conformational variations and polymerization behavior of fresh and frozen-stored gluten fractions during thermal treatment were comparatively tracked. The combined results of Raman spectra and...
Mon, 11/11/2019 - 03:33
Author(s): A.B. Hernández-Abreu, S. Álvarez-Torrellas, V.I. Águeda, M. Larriba, J.A. Delgado, P.A. Calvo, J. GarcíaAbstractThe removal of Bisphenol A, 2,2-bis (4-hydroxyphenyl) propane (BPA) in fixed-bed columns was investigated by breakthrough adsorption tests at different operation conditions and further prediction by a mathematical model to describe the adsorption-diffusion process onto two...
Mon, 11/11/2019 - 03:32
Author(s): Chao Zhang, Yue Tao, Shuangxi Li, Tan Ke, Panpan Wang, Sijie Wei, Lanzhou ChenAbstractSoil co-contaminated with heavy metals and organics is often difficult to remediate. In this study, pot experiments were conducted to investigate the concurrent removal of cadmium (Cd, two levels: CdL [10 mg kg−1] and CdH [50 mg kg−1]) and trichlorfon (TCF, 100 mg kg−1) from co-contaminated soil by...
Mon, 11/11/2019 - 03:32
Author(s): Xiaonan Ji, Chengbin Liu, Gang PanAbstractEutrophication can induce hypoxia/anoxia and rich organic matter at the sediment-water interface in surface waters. When eutrophic waters are impacted with mercury (Hg) pollution, methylmercury (MeHg) production ability (MPA) of surface sediment would increase and more MeHg might be produced. To tackle this risk, this study firstly collected...
Mon, 11/11/2019 - 03:32
Author(s): Yunsen Ji, Xiangling Zhang, Jingtian Gao, Shuangjie Zhao, Yankai Dou, Yu Xue, Lihong ChenAbstractTo investigate the removal mechanisms of cadmium (Cd) by Zn-layer double hydroxides-modified zeolites substrates in constructed rapid infiltration systems (CRIS), the ZnAl-LDHs and ZnFe-LDHs were synthesized and in-situ coated on the original zeolites through co-precipitation method. The...
Mon, 11/11/2019 - 03:32
Author(s): Le Song, Zezhi Zhong, Yongtao Han, Qinglin Zheng, Yuhong Qin, Qian Wu, Xiaoping He, Canping PanAbstractTwelve commercial pesticide formulations containing sixteen active ingredients were applied on greenhouse strawberries at recommended and double doses. The dynamics and dietary risk analysis were investigated. A modified QuEChERS method based on the use of multi-walled carbon...
Mon, 11/11/2019 - 03:32
Author(s): Huatao Li, Pengfei Zhang, Yong Zhao, Hongfu ZhangAbstractPesticides have been extensively produced and used to help the agricultural production which leads to the contamination of the environment, soil, groundwater sources, and even foodstuffs. Fungicides carbendazim (CBZ) and chlorothalonil (Chl) are widely applied in agriculture and other aspects. CBZ or Chl have been reported to...
Mon, 11/11/2019 - 03:32
Author(s): Hui-ling Fu, Xue-song Wang, Ying-ying Huang, Fei-yue Gong, Jing-jie Guo, Chun-tao He, Zhong-Yi YangAbstractCultivar-dependent cadmium (Cd) accumulation was principal in developing Cd-pollution safe cultivars (PSCs). Proteins related to different Cd accumulations of the low-Cd-accumulating (SJ19) and high-Cd-accumulating (CX4) cultivars were investigated by iTRAQ analysis. Higher Cd...
Mon, 11/11/2019 - 03:32
Author(s): Chenyang Xu, Jicheng Hu, Jing Wu, Baokai Wei, Zhenlei Zhu, Liwen Yang, Tingting Zhou, Jun JinAbstractSeventeen soil samples collected in an industrial park located in Ningxia Province, Northwestern China were analyzed for polychlorinated naphthalenes (PCNs), polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs), and polychlorinated biphenyls (PCBs). The PCN, PCDD/F, and PCB...
Thu, 11/07/2019 - 03:38
by Sheikh Mansoor, Nazeer Ahmed, Vikas Sharma, Sumira Jan, Sajad Un Nabi, Javid I. Mir, Mudasir A. Mir, Khalid Z. Masoodi Apple scab caused by Venturia inaequalis Cooke (Wint.) is one the important diseases of trade and industrial significance in apple. In present study variability studies in pathogen isolates were studied, which is one of the most important factors for devising management...
Thu, 11/07/2019 - 03:35
Author(s): Gabriela Camera Leal, Patricia Mattiazzi, Franciele Rovasi, Thaís Dal Molin, Denise Bohrer, Paulo Cícero do Nascimento, Leandro M. de Carvalho, Carine VianaAbstractA method has been developed for the determination of lead (Pb) in dietary supplements using direct solid sampling and high-resolution continuum source graphite furnace atomic absorption spectrometry. The lead concentration...
Thu, 11/07/2019 - 03:32
Author(s): Yuhang Hong, Hongmei Yin, Yi Huang, Qiang Huang, Xiaozhen YangAbstractIt is known that abamectin (ABM) inflicts oxidative damage on aquatic animals; however, knowledge about the immune response under pesticide-induced oxidative stress is incomplete. In the present study, several cellular and humoral immune parameters, including total haemocyte counts (THC), lysosomal membrane stability...
Thu, 11/07/2019 - 03:32
Author(s): Afaf.Abd El Megid, Mohammad E. Abd Al Fatah, Amel El Asely, Yakout El Senosi, Mahmoud M.A. Moustafa, Mahmoud A.O. DawoodAbstractThis study aimed to assess the levels of pyrethroids and organochlorine residues in the tissues of cultured Mugil capito and in water samples obtained from three different sites (Al-Hamol, Al-Riad and Sidi Salem; referred to as Area 1, Area 2, and Area 3,...
Thu, 11/07/2019 - 03:32
Author(s): Yiling Li, Yong-shun Huang, Bin He, Runzeng Liu, Guangbo Qu, Yongguang Yin, Jianbo Shi, Ligang Hu, Guibin JiangAbstractBlood is the transmission medium for metal contaminants to and from bodily organs; as such, it can provide useful and reliable information about their bio-kinetics as they're distributed throughout the body. Metals can interact with endogenous proteins present in the...
Thu, 11/07/2019 - 03:32
Author(s): Adil Khan, Saqib Bilal, Abdul Latif Khan, Muhammad Imran, Ahmed Al-Harrasi, Ahmed Al-Rawahi, In-Jung LeeAbstractWe investigated the physio-molecular effects of separate and combined cadmium (Cd; 200 μM) and salinity (NaCl; 100 mM) stress on date palm during silicon (Si; 1.0 mM) applications. The results showed that exogenous Si led to significant improvements in plant growth, as well...
Thu, 11/07/2019 - 03:32
Author(s): Hui-Jun Fu, Yu Wang, Zhi-Li Xiao, Hong Wang, Zhen-Feng Li, Yu-Dong Shen, Hong-Tao Lei, Yuan-Ming Sun, Zhen-Lin Xu, Bruce HammockAbstractTetrabromobisphenol A (TBBPA) is the largest brominated flame retardant which can be released to environment and cause long-term hazard. In this work, we developed a rapid and highly sensitive fluorescence enzyme-linked immunosorbent assay (FELISA) for...
Thu, 11/07/2019 - 03:29
The efficiency of a molecularly imprinted polymer as a selective packing material for solid‐phase extraction of imatinib mesylate sorption was investigated. Molecularly imprinted polymer was prepared using N, N'‐methylenebisacrylamide, as a cross‐linker agent, N‐vinylcaprolactam as a thermo‐sensitive monomer, 1‐vinyl‐2‐pyrrolidone and methyl methacrylate as functional monomers,...
Thu, 11/07/2019 - 03:29
Despite substantial developments of extraction and separation techniques, isolation of natural products from natural sources is still a challenging task. Undoubtedly hybrid methods like LC‐NMR or LC‐MS made on‐line structure elucidation possible and provided impressive examples of natural product identification without prior isolation, however, in many cases the necessity to get the purified...

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