Chemical contaminants

Mon, 01/18/2016 - 01:44
Summary Volatile compounds from fresh and dried mango were extracted by the solvent-assisted flavour evaporation (SAFE) technique and analysed by GC-MS. Forty-one and fifty five volatile compounds were identified in fresh and dried mango, respectively. Monoterpenes, followed by sesquiterpenes, lactones and alcohols were the major compounds. Drying induced substantial losses of several compounds....
Fri, 01/15/2016 - 00:00
A fast, efficient, and simple method for determination of pesticide residues in pumpkin seeds has been developed combining QuEChERS and dispersive liquid–liquid microextraction (DLLME) followed by gas chromatography and mass spectrometry (GC-MS). Parameters affecting the DLLME performance such as solvent selection and volume of extractive and dispersive solvent, salt effect,...
Thu, 01/14/2016 - 17:00
Ivona Pandrea, Cuiling Xu, Jennifer L. Stock, Daniel N. Frank, Dongzhu Ma, Benjamin B. Policicchio, Tianyu He, Jan Kristoff, Elaine Cornell, George S. Haret-Richter, Anita Trichel, Ruy M. Ribeiro, Russell Tracy, Cara Wilson, Alan L. Landay, Cristian Apetrei Increased chronic immune activation and inflammation are hallmarks of HIV/SIV infection and are highly correlated with progression to AIDS...
Thu, 01/14/2016 - 01:28
Publication date: Available online 13 January 2016 Author(s): Sooyeon Song, Sejong Oh, Kye-Taek Lim The food and water we consume are often contaminated with a range of chemicals and heavy metals, such as lead, cadmium, arsenic, chromium, and mercury by accumulation through the food chain. Cadmium is known to be one of the major components in cigarette smoke and can cause lesions in...
Wed, 01/13/2016 - 07:21
Publication date: June 2016 , Volume 64 Author(s): Lijia Wang, Xuexi Huo Food safety certification has increasingly received much attention by Chinese consumers since the melamine milk crisis. The paper aims to determine consumers' willingness-to-pay (WTP) a price premium for fruit quality certification, and outreach strategy to monitor fresh fruit regulations. 504 fresh apple consumers...
Mon, 01/11/2016 - 17:00
Francesco Raggi, Dania Russo, Claudio Urbani, Chiara Sardella, Luca Manetti, Daniele Cappellani, Isabella Lupi, Luca Tomisti, Enio Martino, Claudio Marcocci, Fausto Bogazzi Polychlorinated biphenyls (PCBs) can disrupt the endocrine function, promote neoplasms and regulate apoptosis in some tissues; however, it is unknown whether PCBs can affect the apoptosis of pituitary cells. The study...
Sat, 01/09/2016 - 00:00
A rapid and sensitive method was established to simultaneously determine multiple pesticide residues in celery through gas chromatography-mass spectrometry (GC-MS). Samples were extracted through a modified quick, easy, cheap, effective, robust, and safe method (modified QuEChERS) and then refined and preconcentrated through dispersive liquid-liquid microextraction (DLLME) by...
Thu, 01/07/2016 - 09:20
Abstract AimsTo assess frequencies of the Aspergillus flavus atoxigenic vegetative compatibility group (VCG) YV36, to which the biocontrol agent AF36 belongs, in maize-growing regions of Mexico. Methods and ResultsOver 3,500 Aspergillus flavus isolates recovered from maize agroecosystems in four Mexican states during 2005 through 2008 were subjected to vegetative compatibility analyses based on...
Wed, 01/06/2016 - 00:00
Trace elements are commonly present as components of metabolic enzymes, hormones and antioxidants in human milk. Previous studies have reported single or few elements in relatively large volumes of human milk using complex, time-consuming and expensive methods involving microwave-assisted acid digestion and extraction using tetramethylammonium hydroxide at various temperatures...
Tue, 01/05/2016 - 09:35
Publication date: June 2016 , Volume 64 Author(s): Jangho Hong, Ayato Kawashima, Minami Okamoto, Kana Kanetsuki, Takanori Makino, Noriaki Hamada The recovery and purification characteristics of membrane filtration for pesticide analysis of agricultural products were investigated. Eight different types of membranes classified by their molecular weight cut off (MWCO) and material...
Tue, 01/05/2016 - 09:35
Publication date: May 2016 , Volume 63 Author(s): Li Cheng, Shuo Jiang, Shuai Zhang, He You, Jingwen Zhang, Ziyu Zhou, Yi Xiao, Xiao Liu, Yunshan Du, Jielin Li, Xuan Wang, Yaqi Xin, Yangeng Zheng, Kexin Shang Many studies have measured the perceptions of consumers on different aspects of food safety but only a limited number of studies focused on consumer's...
Tue, 01/05/2016 - 09:35
Publication date: June 2016 , Volume 64 Author(s): Kyung-Min Lee, Timothy J. Herrman, Susie Y. Dai The statistically derived risk-based sampling plan for surveillance sample assignments of chemical and biological hazards was designed using binomial probability distribution. The binomial statistics was applied to the past 3-year data to estimate a confidence interval and a sample size...
Tue, 01/05/2016 - 09:35
Publication date: June 2016 , Volume 64 Author(s): Qin He, Junwei Huang, Xuewei Yang, Xin Yan, Jian He, Shunpeng Li, Jiandong Jiang The effect of different kinds of pesticide residues in grapes on alcoholic fermentation by Saccharomyces cerevisiae was evaluated. Among four types of pesticides added into the grape slurry, omethoate, triadimefon and cyhalothrin did not inhibit the...
Tue, 01/05/2016 - 09:35
Publication date: June 2016 , Volume 64 Author(s): Zhiqiang Kong, Minmin Li, Jieying Chen, Yuming Bao, Bei Fan, Frédéric Francis, Xiaofeng Dai Numerous studies have focused on the effects of food-processing techniques on pesticide residues. However, it remains a challenge to ensure high-quality processing and effective pesticide removal from foods. Triadimefon (TF) is a broad-...
Mon, 01/04/2016 - 07:21
Abstract Aims(i) To investigate the enzymatic characterization of α-L-arabinofuranosidase from Thermotoga thermarum DSM5069. (ii) To perform its excellent properties on converting ginsenoside Rc to ginsenoside Rd. Methods and ResultsThe thermostable α-L-arabinofuranosidase (Tt-Afs) gene from Thermotoga thermarum DSM5069 was cloned and overexpressed. Recombinant Tt-Afs was purified, and its...
Fri, 01/01/2016 - 00:00
In this study, copper(II) isonicotinate was first used as an online cleanup adsorbent in selective pressurized liquid extraction (SPLE) for determination of trace residues of polychlorinated biphenyls (PCBs) in fatty food samples. The adsorbent-to-sample ratio, extraction temperature, extraction time, recycle times, etc. were optimized. The PCBs in food samples of pork,...
Fri, 01/01/2016 - 00:00
A sensitive and reliable method was proposed for the simultaneous detection of melamine, ammeline, ammelide, and cyanuric acid in fish and shrimp by gas chromatography–mass spectrometry after fast derivatization. The analytes were derivatized using a 99:1 mixture of N,O-bis(trimethylsilyl)trifluoroacetamide (BSTFA) and trimethylchlorosilane (TMCS) under microwave irradiation...
Fri, 01/01/2016 - 00:00
The efficiency of multi-detection screening methods, based on liquid chromatography coupled with tandem mass spectrometry, has been proven in recent years. However, when simultaneously analyzing different groups of compounds with different physicochemical properties, the specificity of sample preparation has to be minimized. In mass spectrometry, this situation can lead to...
Fri, 01/01/2016 - 00:00
A sensitive molecularly imprinted electrochemical sensor was successfully constructed for the detection of acrylamide (AM). It is based on a glassy carbon electrode modified with a composites prepared from gold nanoparticles, multiwalled carbon nanotubes, and chitosan along with a sol-gel-based molecularly imprinted polymer (MIP) film. The latter was prepared using AM as the...
Tue, 12/29/2015 - 17:00
Jinxiang Wang, Pingping Zhang, Na Liu, Qian Wang, Jixian Luo, Lan Wang Calcium ion (Ca2+) is one of the key intracellular signals, which is implicated in the regulation of cell functions such as impregnation, cell proliferation, differentiation and death. Cadmium (Cd) is a toxic environmental pollutant that can disturb cell functions and even lead to cell death. Recently, we have found that Cd...
Mon, 12/28/2015 - 22:01
Publication date: May 2016 , Volume 115 Author(s): Amy E. Wiberley-Bradford, James S. Busse, Paul C. Bethke Regulation of sugar metabolism in potato tubers stored at low temperatures has significant ramifications for producers and consumers of potato chips and French fries. Low-temperature storage reduces losses due to sprouting and disease but induces undesirable accumulation of the...
Sat, 12/26/2015 - 22:08
Publication date: January 2016 , Volume 99, Issue 1 Author(s): T. Romero, J. Balado, R.L. Althaus, M.C. Beltrán, M.P. Molina The aim of this study was to determine whether the prophylactic use of antibiotics in intravaginal sponges used for estrus synchronization in goats may result in the presence of inhibitors in milk and, therefore, of positive results by microbial screening...
Sat, 12/26/2015 - 22:08
Publication date: January 2016 , Volume 99, Issue 1 Author(s): P.J. Gorden, M.D. Kleinhenz, L.W. Wulf, B. KuKanich, C.J. Lee, C. Wang, J.F. Coetzee Mastitis is a frequent problem among dairy cows, reducing milk yield and increasing cull rates. Systemic therapy with the cephalosporin antimicrobial ceftiofur hydrochloride (CEF) may improve therapeutic outcomes, but the incidence...
Wed, 12/23/2015 - 21:55
Publication date: May 2016 , Volume 115 Author(s): Linyan Song, Zhigang Wang, Zhimin Wang, Geng Meng, Rui Zhai, Meng Cai, Fengwang Ma, Lingfei Xu Postharvest softening is an important physiological process that influences pear fruit quality. ‘Starkrimson’ pears soften rapidly, resulting in fruits with a low tolerance for storage and transportation. To better characterize the...
Tue, 12/22/2015 - 17:00
Alessandra Cardinali, Diego Pizzeghello, Giuseppe Zanin Introduction In intensive agriculture areas the use of pesticides can alter soil properties and microbial community structure with the risk of reducing soil quality. Materials and Methods In this study the fatty acid methyl esters (FAMEs) evolution has been studied in a factorial lab experiment combining five substrates (a soil, two aged...
Tue, 12/22/2015 - 02:05
Abstract BackgroundThe challenge in developing analytical assessment of unexpected excess contaminations in infant formula has been the most significant project to address the widespread issue of food safety and security. Foodomics based on metabolomics techniques provides powerful tools for the detection of tampering cases with intentional contaminations. However, the safety and risk assessments...
Fri, 12/18/2015 - 09:59
Publication date: Available online 17 December 2015 Food and Chemical Toxicology Author(s): M. Julia Melgar, Julián Alonso, M. Angeles García Mushrooms do not constitute a significant portion of the human diet, but the consumption of wild and cultivated mushrooms has become increasingly in recent years. Some species accumulate high levels of toxic metals, both in unpolluted and polluted...
Wed, 12/16/2015 - 01:20
Poultry litter is commonly used as fertilizer in agriculture. However, this poultry litter must be processed prior to use, since poultry have a large number of pathogenic microorganisms. The aims of this study were to isolate and genotypically and phenotypically characterize Escherichia coli from avian organic fertilizer. Sixty-four E. coli isolates were identified from avian organic fertilizer...
Tue, 12/15/2015 - 16:13
Journal of Agricultural and Food ChemistryDOI: 10.1021/acs.jafc.5b04164
Sat, 12/12/2015 - 07:24
Publication date: Available online 11 December 2015 Food and Chemical Toxicology Author(s): Vasily N. Dobrovolsky, Monserrat M. Pacheco-Martinez, Patrice L. McDaniel, Mason G. Pearce, Wei Ding Acrylamide (ACR) and glycidyl methacrylate (GMA) are structurally related compounds used for making polymers with various properties. Both chemicals can be present in food either as a...
Fri, 12/11/2015 - 17:00
Mohd Raihan Taha, Shariat Mobasser This paper presents the findings of a study on adsorption of dichlorodiphenythreechloroethen (DDT) and polychlorinated biphenyls (PCBs) on three nanomaterials including Multi walled Carbon Nanotube (MWNT), nano-clay and nano-alumina. DDT and PCBs are of significant concern due their high toxicity and long environmental half-lives. Experiments were conducted...
Thu, 12/10/2015 - 07:20
Publication date: Available online 10 December 2015 Food and Chemical Toxicology Author(s): Grazia Barone, Roberto Giacominelli-Stuffler, Maria M. Storelli The objectives of this study were to investigate the trace element (Hg, Cd, Pb, Cu, Zn, Ni, Fe, Cr and Se) and polychlorinated biphenyl (PCBs) content of several commercially available brands of green and black tea marketed in Italy...
Mon, 12/07/2015 - 11:37
Na+-translocating NADH:quinone oxidoreductase (Na+-NQR) catalyzes electron transfer from NADH to ubiquinone in the bacterial respiratory chain, coupled with Na+ translocation across the membrane. Na+-NQR maturation involves covalent attachment of FMN residues, catalyzed by flavin transferase encoded by the nqr-associated apbE gene. Analysis of complete bacterial genomes has revealed another...
Wed, 12/02/2015 - 19:14
Publication date: Available online 2 December 2015 Author(s): Margarita Andreadou, Emmanouil Liandris, Maria Gazouli, Antonia Mataragka, Ilias Tachtsidis, Nikolaοs Goutas, Dimitrios Vlachodimitropoulos, John Ikonomopoulos Leishmaniosis is a zoonotic disease that affects millions of people especially in resource-poor setting. The development of reliable diagnostic assays that...
Wed, 12/02/2015 - 15:07
Abstract Lead (Pb) is an environmental pollutant that can get entry into human body through contaminated foods, drinks, and inhaled air leading to severe biological consequences, and has been responsible for many deaths worldwide. The objectives of this study were 1st to investigate the modulatory effects of environmentally relevant concentrations of Pb on AhR gene battery, which is controlling...
Wed, 12/02/2015 - 11:49
Journal of Agricultural and Food ChemistryDOI: 10.1021/acs.jafc.5b04337
Wed, 12/02/2015 - 02:51
Publication date: Available online 1 December 2015 Food and Chemical Toxicology Author(s): Jie Gao, Yunfeng Zhao, Feng Zhu, Yongjian Ma, Xiaowei Li, Hong Miao, Yongning Wu The levels of acrylamide in 240 food composite samples from the 5th Chinese Total Diet Study (TDS) were measured using an LC-MS/MS method and the exposure estimates for the general population were evaluated....
Sat, 11/28/2015 - 00:00
In this study, a screening method was developed using ultra-high performance liquid chromatography time-of-flight mass spectrometry (UHPLC-TOFMS) for multiclass pesticide analysis in jam samples. The method was based on an experimental database with retention time/accurate mass data for the 353 selected analytes. Compound identification was based on retention time and the...
Thu, 11/26/2015 - 00:00
A new method was developed for the determination of four acrylamide compounds (acrylamide, methacrylamide, N-methylol acrylamide, N-(Methoxymethyl)methacrylamide) in food contact paper products, three kinds of water-based food simulants, and dry food simulant (modified polyphenylene oxide, MPPO) by using ultra-high performance liquid chromatography tandem mass spectrometry (...
Wed, 11/25/2015 - 00:00
Polychlorinated biphenyl (PCB) residues in food are an important food safety concern. Simple and sensitive analytical methods are needed to monitor PCB residues and ensure that food is safe for consumption. The aim of this study was to adapt a selective, sensitive, quick, and easy sample treatment for purification of animal fat matrices and to measure the level of PCB28, PCB52...

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