Chemical contaminants

Thu, 10/17/2019 - 03:32
Yellowfin tuna is one of the favorite aquatic foods and possesses high economic value due to its unique pleasant flavor and good nutrition quality. Volatile and nonvolatile compounds that affect the flavor quality of tuna fish during canning process were investigated. The volatiles were analyzed by headspace solid‐phase microextraction combined with GC‐MS and the nonvolatiles were characterized...
Thu, 10/17/2019 - 03:32
Interactions of the flavoring compounds hexyl acetate (HxAc), heptyl acetate (HpAc), linalyl formate (LiFo), linalyl acetate (LiAc), geraniol, linalool, limonene, and myrcene with soy protein isolate (SPI) were estimated in pH 3.0, 6.0, and 9.0 aqueous solutions using headspace solid‐phase microextraction gas chromatography–mass spectrometry (SPME–GC–MS). The binding capacity of HxAc, HpAc, LiFo...
Thu, 10/17/2019 - 03:29
The use of leaded gasoline adversely affects cardiovascular, nervous, and immune systems. Study projects to rule out different variables of prognostic importance in lead-exposed subjects. A total of 317 traffic wardens with 5 years of outdoor experience and Hb levels < 10 µg/dl, and 100 traffic wardens with indoor duties were substituted in two groups. Levels of vitamins, cytokines, lead, iron...
Thu, 10/17/2019 - 03:29
Lake sediments are important reservoirs for polycyclic aromatic hydrocarbons (PAHs) in catchments. Knowledge of occurrence, sources, and toxicological risk of PAHs is crucial to abate their pollution and risk. We investigated the spatial and temporal occurrence, sources, and potential toxicological risks of 12 PAHs in the surface sediments and one sediment core of the largest deep lake (Lake...
Thu, 10/17/2019 - 03:28
Antimicrobial residues in milk have been discussed as a possible selector for Enterobacteriaceae that produce extended-spectrum β-lactamases (ESBL) in dairy herds. Such residues are found in waste milk after antibiotic treatment of mastitis, but antibiotic dry cow therapy might also lead to antibiotic residues in colostrum and in milk during early lactation. While it is known that feeding of...
Wed, 10/16/2019 - 03:41
ABSTRACT To further our understanding of one-carbon metabolism in the protozoan parasite Leishmania, we conducted genomic screens to study how the parasite responded to sinefungin (SNF) selection. SNF is a structural analogue of S-adenosylmethionine (AdoMet), a key methyl group donor to a number of biomolecules. One screen consisted of sequencing SNF-resistant mutants generated by stepwise...
Wed, 10/16/2019 - 03:37
Author(s): Huiyu Wang, Shanjun Song, Mingwu Shao, Yan Gao, Chen Yang, Ya Li, Weihua Wang, Yajuan He, Penghui LiAbstractFreshness protection packages and preservative films are widely used food-contact plastic made of polyethylene. Diode array detector (DAD), charged aerosol detector (CAD) and evaporative light-scattering detector (ELSD) were evaluated for determination of 6 bisphenols (bisphenol...
Wed, 10/16/2019 - 03:33
The capsaicin in hot peppers is an important biological active substance that is widely used in food and medicine. Our current study shows that capsaicin derivatives have good antioxidant and antibacterial activities, and therefore, the present study of capsaicin derivatives with good activity provides a good foundation for future applications in natural food additives and medicine. Abstract The...
Wed, 10/16/2019 - 03:32
The current research focuses on anaerobic respiration of arsenic and other toxic metals by purple nonsulfur bacteria (PNSB). Among the optimization assays performed were carbon utilization, cross metal resistance, and metal respiration, along with a comparison of each assay in photoheterotrophic and chemoheterotrophic growth. The bacteria were identified by the classification of 16S ribosomal RNA...
Wed, 10/16/2019 - 03:30
Little is known about the presence and effects of polychlorinated biphenyls (PCBs) and organochlorine pesticides (OCPs) in Puerto Rico’s waters. Four coastal aquatic systems were investigated using low-density polyethylene passive sampling for PCBs and OCPs in water and its overlying air. The highest total freely dissolved and gaseous concentrations of PCBs were found in Guánica Bay, with 4000 pg...
Wed, 10/16/2019 - 03:29
Functional foods provide nutritional and health benefits, yet they could be contaminated with residues like pesticides and polychlorobiphenyls. These residues affect the safety, quality, and consequently the commercial value of functional foods. Therefore, the validity and efficiency of residue determination methods constitute a major analytical concern. Reduction of matrix effect (ME) has always...
Wed, 10/16/2019 - 03:29
Although many proteins possess a distinct folded structure lying at a minimum in a funneled free energy landscape, thermal energy causes any protein to continuously access lowly populated excited states. The existence of excited states is an integral part of biological function. Although transitions into the excited states may lead...
Tue, 10/15/2019 - 03:35
Dichlorvos (DDVP) is widely applied in the agricultural industry, and its residues are considered hazardous to the environment. Microbial bioremediation is an innovative technology with the potential to mitigate such pollution. Trichoderma atroviride strain T23, a filamentous fungus, is very efficient at degrading DDVP. Therefore, we used DDVP as a model organophosphate pesticide to study the...
Tue, 10/15/2019 - 03:34
Aflatoxins (AFs) as potent food contaminants are highly detrimental to human and animal health. The production of such biological toxins is influenced by environmental factors including pollutants, such as dioxins. Here, we report the biological feedback of an active AF-producer strain of A. flavus upon in vitro exposure to the most toxic congener of dioxins, the 2,3,7,8-tetrachlorinated dibenzo-...
Sun, 10/13/2019 - 03:43
Author(s): Hamdy A. Abdel-Gawwad, Mona S. Mohammed, Mohamed HeikalAbstractThe beneficial use of alkali-activation/sintering process in the fabrication of open-celled cellular materials and lead solidification/stabilization (S/S) is the biggest challenge of the present work. Waste glass (WG), red-clay brick waste (RCBW), and lead-bearing-sludge (LBS) were used as silicate-rich-wastes in the...
Sun, 10/13/2019 - 03:43
Author(s): Carla Pirozzi, Ludovico Pontoni, Massimiliano Fabbricino, Anna Bogush, Luiza C. CamposAbstractThe paper presents an experimental study aimed at investigating the mechanism responsible for Bisphenol A adsorption on natural cork, and the role played on process kinetics by the organic matter released from the cork. Obtained data show that natural cork has a good affinity toward Bisphenol...
Sun, 10/13/2019 - 03:41
Author(s): Nabi Shariatifar, Manouchehr Dadgar, Yadolah Fakhri, Saeed Shahsavari, Mojtaba Moazzen, Mahsa Ahmadloo, Amin Kiani, Saeed Aeenehvand, Shahrokh Nazmara, Amin Mousavi KhanegahAbstractAn MSPE/GC-MS method was used for the measuring of 16 PAHs and assessing of the effect of different factors on PAHs concentrations among different types of dairy products. Moreover, the probabilistic health...
Sun, 10/13/2019 - 03:38
Author(s): Jun Tan, Xianbo Lu, Lei Fu, Guoshun Yang, Jiping ChenAbstractThis study aimed at developing a simple and accurate method for determination of emerging chlorinated polycyclic aromatic hydrocarbons (Cl-PAHs) in fish by stable isotope dilution gas chromatography tandem mass spectrometry. Fish samples were extracted by improved accelerated solvent extraction (ASE) method. Matrix effects...
Sun, 10/13/2019 - 03:38
Author(s): Lixin Wang, Miaomiao Zheng, Shuping Zhang, Chuan Zhao, Weijun Kang, Ke WangAbstractCadmium, a typical heavy metal, causes serious toxicities on many organs and tissues. As the last partially controlled class of polybrominated diphenyl ethers (PBDEs), BDE209 can also induce various health issues. Although apoptosis mediated by mitochondria has been known to be a key player in inducing...
Sat, 10/12/2019 - 03:39
Author(s): Hyunjeong Ju, Byungjoo Kim, Jeongkwon Kim, Song-Yee BaekAbstractWe developed an isotope-dilution gas chromatography/high-resolution mass spectrometry (ID-GC/HRMS) method for the accurate quantification of four polycyclic aromatic hydrocarbons (PAHs) in olive oil. The clean-up steps were optimized to sufficiently remove co-extracted olive oil matrix using the EZ-POP-NP dual-layer and...
Sat, 10/12/2019 - 03:37
Author(s): Huanyu Bao, Jinfeng Wang, Jiao Li, He Zhang, Fuyong WuAbstractIn order to provide a viable option for remediation of PAHs-contaminated soils, a greenhouse experiment was conducted to assess the effect of corn straw amendment (1%, 2%, 4% or 6%, w/w) on dissipation of aged polycyclic aromatic hydrocarbons (PAHs) in contaminated soils. Backpropagation artificial neural network (BP-ANN)...
Sat, 10/12/2019 - 03:29
The objective of this study was to evaluate the effect of different cooking methods on the β-carotene content of jute mallow (Corchorus olitorius) leaves. Three cooking methods have been experimented. Jute mallow raw leaves was respectively boiled for 15 and 30 minutes in water (CW), in water containing ash leachate (CWA) and frying for 5 minutes followed by cooking with water (CWF) for 15 and 30...
Fri, 10/11/2019 - 03:41
by Shan Lu, Zhongyun Dong Proliferating cell nuclear antigen (PCNA) is essential for DNA replication and repair, and cell growth and survival. Previously, we identified a novel class of small molecules that bind directly to PCNA, stabilize PCNA trimer structure, reduce chromatin-associated PCNA, selectively inhibit tumor cell growth, and induce apoptosis. The purpose of this study was to...
Fri, 10/11/2019 - 03:40
Author(s): Jesus D. Fernandez-Bayo, Emily A. Shea, Amy E. Parr, Yigal Achmon, James J. Stapleton, Jean S. VanderGheynst, Amanda K. Hodson, Christopher W. SimmonsAbstractBiosolarization utilizes organic amendments to produce biopesticide compounds in soil that can work in tandem with other stresses to inactivate agricultural pests. The prospect of using by-products from industrial almond...
Fri, 10/11/2019 - 03:37
Author(s): Diana Matos, Carina Sá, Paulo Cardoso, Adília Pires, Sílvia M. Rocha, Etelvina FigueiraAbstractRhizobia have a significant agronomic and environmental role and are eminent contributors to soil fertility. However, this group of microorganisms are affected by various environmental stresses, such as Cd contamination. High Cd concentrations change bacterial metabolism. During this...
Fri, 10/11/2019 - 03:37
Author(s): Florian Zindler, Franziska Beedgen, Diana Brandt, Madeleine Steiner, Daniel Stengel, Lisa Baumann, Thomas BraunbeckAbstractIn (eco)toxicology, there is a critical need for efficient methods to evaluate the neurotoxic potential of environmental chemicals. Recent studies proposed analysis of early coiling activity in zebrafish embryos as a powerful tool for the identification of...
Fri, 10/11/2019 - 03:29
Antimicrobial peptides (AMPs) represent the largest group of endogenous compounds and serves as a novel alternative to traditional antibiotics for the treatment of pathogenic microorganisms. Moricin is an important α-helical AMP plays a crucial role in insect humoral defense reactions. The present study was designed to identify and characterize novel AMP moricin (Px-Mor) from diamondback moth (...
Thu, 10/10/2019 - 03:37
Author(s): Ling Mo, Xiaobo Zheng, Chunyou Zhu, Yuxin Sun, Lehuan Yu, Xiaojun Luo, Bixian MaiAbstractPlenty of banned and emerging persistent organic pollutants (POPs), including dichlorodiphenyltrichloroethane and its metabolites (DDTs), polychlorinated biphenyls (PCBs), polybrominated diphenyl ethers (PBDEs), dechlorane plus (DP), and decabromodiphenyl ethane (DBDPE), were measured in oriental...
Thu, 10/10/2019 - 03:37
Author(s): Surbhi Dabral, Yashaswee, Ajit Varma, Devendra Kumar Choudhary, Rajeev Nayan Bahuguna, Manoj NathAbstractPiriformospora indica is known for plant growth promotion and abiotic stress alleviation potential in several agricultural crops. However, a systemic analysis is warranted to explore potential application of this important fungus to augment heavy metal tolerance in rice. The present...
Wed, 10/09/2019 - 03:32
In this study, we have developed a method to assess adenosine 5ʹ‐triphosphate by adsorptive extraction using surface adenosine 5'‐triphosphate‐imprinted polymer over polystyrene nanoparticles (412 ± 16 nm) for selective recognition/separation from urine. Molecularly imprinted polymer was synthesized by emulsion copolymerization reaction using adenosine 5'‐triphosphate as a template, functional...
Wed, 10/09/2019 - 03:29
In this study, a binary mixture in dispersive liquid-liquid microextraction was used for the preconcentration and determination of selected pesticides, pharmaceutical and hormone by GC–MS. A Box–Behnken experimental design was used to optimize the amounts of binary mixture, dispersive solvent and salt. The optimum parameters obtained were dichloromethane/1,2-dichloroethane binary mixture (200 µL...
Wed, 10/09/2019 - 03:29
A hydroponic experiment was carried out to study the accumulation characteristics of copper (Cu) and lead (Pb) combined pollution in three ornamental plants. The results showed that these tested ornamental plants had higher tolerance to Cu–Pb combined pollution and could effectively accumulate the heavy metals. The Cu and Pb concentrations were higher in the roots of the ornamental plants than...
Wed, 10/09/2019 - 03:29
Abstract Presence of bacterial contaminants at levels > 107 colony forming units per milliliter (CFU/mL) during ethanol production processes reduces the alcoholic fermentation yield by 30%. Antibiotics are currently used to control contamination, but their residues may be detected in yeast extract, restricting this by-product trade to several countries. Thus, the objective of this study was...
Wed, 10/09/2019 - 03:29
To maintain self-sufficiency in rice production and national food security, the Chinese government strongly supports research that aims at increasing the productivity of rice cultivation. Rice with genetic material from Bacillus thuringiensis (Bt rice) is transgenic rice that can reduce lepidopteran pest damage and the use of insecticides. It was developed in the 1990s and earned biosafety...
Wed, 10/09/2019 - 03:29
Detoxification of the highly toxic cadmium element is essential for the survival of living organisms. Pseudomonas putida CadR, a MerR family transcriptional regulator, has been reported to exhibit an ultraspecific response to the cadmium ion. Our crystallographic and spectroscopic studies reveal that the extra cadmium selectivity of CadR is mediated...
Mon, 10/07/2019 - 03:35
Author(s): Yinqing Zhang, Kunkun Wang, Yi Yang, Jinliang Xu, Binbin Sun, Lingyan ZhuAbstractSilver nanowires (AgNWs) are widely produced in many electronic and optical products, and could be inevitably discharged into the aquatic environments. Sulfidation is one of the most important transformation processes of AgNWs, and could significantly affect their fate and interactions with other...
Mon, 10/07/2019 - 03:35
Author(s): Yakui Chen, Qifa Zhu, Xiangzhou Dong, Weiwei Huang, Chenyu Du, Diannan LuAbstractA novel strain Serratia marcescens HB-4 with high Cadmium adsorption capacity was isolated from heavy metal contaminated soil in Hunan province, China. S. marcescens HB-4 reduced the concentration of Cd present in wastewater to less than 0.1 mg/L when the inlet stream contained no higher than 5.0 mg/L Cd....
Mon, 10/07/2019 - 03:35
Author(s): M.O. Ibiwoye, Q. Matthews, K. Travers, J.D. FosterSummaryClinical and experimental studies have demonstrated the neurotoxic and behavioural effects of cadmium. However, the exact pathophysiological mechanism(s) of cadmium neurotoxicity on the human central nervous system (CNS) is not completely understood. A rat blood–brain barrier (BBB) endothelial marker, the endothelial barrier...
Mon, 10/07/2019 - 03:31
Molecular imprinted polymers prepared by Pickering emulsion method with lignin as stable particle were used as dispersants in matrix solid phase dispersion, followed by ultra performance liquid chromatography‐tandem mass spectrometry analysis to research the degradation behavior of matrine in soil. The molecular imprinted polymers have regularly morphology and uniformly particles. Moreover, the...
Sat, 10/05/2019 - 03:41
by Karina Orlowska, Sylwia Swigonska, Agnieszka Sadowska, Monika Ruszkowska, Anna Nynca, Tomasz Molcan, Agata Zmijewska, Renata E. Ciereszko 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) is a toxic man-made chemical compound contaminating the environment and affecting human/animal health and reproduction. Intracellular TCDD action usually involves the activation of aryl hydrocarbon receptor (AhR)....
Sat, 10/05/2019 - 03:36
Author(s): Amira M. Hegazy, Rehab M. Abdelfatah, Hamada M. Mahmoud, Mohamed A. ElsayedAbstractCombination of pesticides; acetamiprid, flutolanil and etofenprox are usually used for tomato fruits for protecting them against pest infection. Generally, pesticides, residues could be one of the health hazard sources. Two specific simple sensitive chromatographic methods are developed for simultaneous...
Sat, 10/05/2019 - 03:30
The use of pedunculate oak (Quercus robur L.), along with other tree species, for the afforestation of heavy metal contaminated lands is an attractive prospect. Little, however, is known of Q. robur tolerance and its antioxidative system response to heavy metal exposure. The main objective of the study was to determine the cadmium-induced changes in antioxidative system of pedunculate oak in an...
Sat, 10/05/2019 - 03:30
In this study, ambient PM2.5 samples were collected from October 2014 to August 2015 in urban area of Luoyang (LY) and Pingdingshan (PDS), two medium-size industrial cities in central China. Sixteen priority polycyclic aromatic hydrocarbons (PAHs) were analyzed to investigate the seasonal variation, potential pollution sources, and health risk of PAHs bound to PM2.5 (PM2.5-bound PAHs). The...
Fri, 10/04/2019 - 03:40
Author(s): Cristina García-Florentino, Maite Maguregui, Chiara Ciantelli, Alessandro Sardella, Alessandra Bonazza, Ignasi Queralt, Jose Antonio Carrero, Claudio Natali, Héctor Morillas, Juan Manuel Madariaga, Gorka AranaAbstractConstruction materials affected by black crusts (BCs) can be subjected to restoration, demolition, recycling or even to their management as waste products. Therefore, the...
Fri, 10/04/2019 - 03:37
Author(s): Wenhao Li, Kaikai Mao, Chaoya Liu, Peipan Gong, Pengfei Xu, Gang Wu, Wei Le, Hu Wan, Hong You, Jianhong LiAbstractSogatella furcifera (Horváth) is a major threat to rice production in China. Insecticides are a key component of typical pest management schemes, but few studies have quantitatively identified insecticide control failures due to insecticide resistance. Therefore, we...
Fri, 10/04/2019 - 03:32
ABSTRACT In this study, quick, easy, cheap, effective, rugged and safe combined with dispersive liquid‐liquid microextraction is developed for extraction of ten pesticides in complex sample matrices of water and milk. In this regard, effective factors of proposed extraction technique combined with gas chromatography‐flame ionization detector were designed, modeled and optimized using central...
Thu, 10/03/2019 - 03:37
Author(s): Xiaoxia Dong, Fan Yang, Shuping Yang, Changzhou YanAbstractCanna indica L. is a promising species for heavy metal phytoremediation due to its fast growth rate and large biomass. However, few studies have investigated cadmium (Cd) tolerance mechanisms. In the present study, Canna plants were cultivated under hydroponic conditions with increasing Cd concentrations (0, 5, 10, 15 mg/L). We...

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