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Ochratoxin

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https://www.readbyqxmd.com/read/28322500/liquid-chromatography-with-mass-spectrometry-analysis-of-mycotoxins-in-food-samples-using-silica-hydride-based-stationary-phases
#1
Joseph P Pesek, Maria T Matyska, Jessica F Hoffmann, Nathalia A Madruga, Rosane L Crizel, Moacir C Elias, Nathan L Vanier, Fabio C Chaves
Liquid chromatography with mass spectrometry analysis of selected food samples using silica hydride stationary phases allowed for the identification and quantification of common mycotoxins including aflatoxin B1, B2, G1, G2, ochratoxin A, and fumosinin B1. Phenyl and C18 columns showed relatively similar selectivity based on hydrophobicity but the phenyl phase provides and additional mechanism, π-π interaction. The most hydrophobic of the analyzed compounds was more strongly retained on the C18 column and also has fewer unsaturated sites, which limited the interaction with the phenyl phase...
March 21, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28318567/determination-of-ochratoxin-a-in-wine-by-packed-in-tube-solid-phase-microextraction-followed-by-high-performance-liquid-chromatography-coupled-to-tandem-mass-spectrometry
#2
Mariane A Andrade, Fernando M Lanças
Ochratoxin A (OTA), a widely studied mycotoxin, can be found in a variety of food matrices. As its concentration in food is generally low (in the order of μg kg(-1)), sample preparation techniques are necessary for the analyte purification and pre-concentration in order to achieve the required low detection limits. The separation and detection methods used for OTA analysis should also offer proper sensitivity in order to allow the adequate quantification of the analyte. This manuscript addresses the development of a methodology aiming the analysis of OTA in wine samples by packed in-tube SPME in flow through extraction mode coupled to HPLC-MS/MS...
March 1, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28300780/simultaneous-determination-of-multi-mycotoxins-in-cereal-grains-collected-from-south-korea-by-lc-ms-ms
#3
Dong-Ho Kim, Sung-Yong Hong, Jea Woo Kang, Sung Min Cho, Kyu Ri Lee, Tae Kyung An, Chan Lee, Soo Hyun Chung
An improved analytical method compared with conventional ones was developed for simultaneous determination of 13 mycotoxins (deoxynivalenol, nivalenol, 3-acetylnivalenol, aflatoxin B₁, aflatoxin B₂, aflatoxin G₁, aflatoxin G₂, fumonisin B₁, fumonisin B₂, T-2, HT-2, zearalenone, and ochratoxin A) in cereal grains by liquid chromatography-tandem mass spectrometry (LC/MS/MS) after a single immunoaffinity column clean-up. The method showed a good linearity, sensitivity, specificity, and accuracy in mycotoxin determination by LC/MS/MS...
March 16, 2017: Toxins
https://www.readbyqxmd.com/read/28299415/multi-mycotoxin-analysis-using-dried-blood-spots-and-dried-serum-spots
#4
Bernd Osteresch, Susana Viegas, Benedikt Cramer, Hans-Ulrich Humpf
In this study, a rapid multi-mycotoxin approach was developed for biomonitoring and quantification of 27 important mycotoxins and mycotoxin metabolites in human blood samples. HPLC-MS/MS detection was used for the analysis of dried serum spots (DSS) and dried blood spots (DBS). Detection of aflatoxins (AFB1, AFB2, AFG1, AFG2, AFM1), trichothecenes (deoxynivalenol, DON; DON-3-glucoronic acid, DON-3-GlcA; T-2; HT-2; and HT-2-4-GlcA), fumonisin B1 (FB1), ochratoxins (OTA and its thermal degradation product 2'R-OTA; OTα; 10-hydroxychratoxin A, 10-OH-OTA), citrinin (CIT and its urinary metabolite dihydrocitrinone, DH-CIT), zearalenone and zearalanone (ZEN, ZAN), altenuene (ALT), alternariols (AOH; alternariol monomethyl ether, AME), enniatins (EnA, EnA1, EnB, EnB1) and beauvericin (Bea) was validated for two matrices, serum (DSS), and whole blood (DBS)...
March 15, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28286205/ochratoxin-a-induced-premature-senescence-in-human-renal-proximal-tubular-cells
#5
Xuan Yang, Sheng Liu, Chuchu Huang, Haomiao Wang, Yunbo Luo, Wentao Xu, Kunlun Huang
Ochratoxin A (OTA) has many nephrotoxic effects and is a promising compound for the study of nephrotoxicity. Human renal proximal tubular cells (HKC) are an important model for the study of renal reabsorption, renal physiology and pathology. Since the induction of OTA in renal senescence is largely unknown, whether OTA can induce renal senescence, especially at a sublethal dose, and the mechanism of OTA toxicity remain unclear. In our study, a sublethal dose of OTA led to an enhanced senescent phenotype, β-galactosidase staining and senescence associated secretory phenotype (SASP)...
March 9, 2017: Toxicology
https://www.readbyqxmd.com/read/28278126/impact-of-substrate-contamination-with-mycotoxins-heavy-metals-and-pesticides-on-growth-performance-and-composition-of-black-soldier-fly-larvae-hermetia-illucens-for-use-in-the-feed-and-food-value-chain
#6
Benedict Purschke, Rafaela Scheibelberger, Sonja Axmann, Andreas Adler, Henry Jäger
Edible insects have emerged as an alternative and sustainable source of high-quality, animal-derived protein and fat for livestock production or direct human nutrition. During production of insects, substrate quality is a key parameter to assure optimal insect biomass gain as well as the safety of feed and food derived from commercially reared insects. Therefore, the influence of a realistic substrate contamination scenario on growth performance and accumulation behaviour of black soldier fly larvae (BSFL, Hermetia illucens L...
February 26, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/28277792/estimation-of-ochratoxin-a-in-poultry-feed-and-its-ingredients-with-special-reference-to-temperature-conditions
#7
Z Abidin, A Khatoon, N Arooj, S Hussain, S Ali, A W Manzoor, M K Saleemi
1. The present study was designed to analyse ochratoxin A (OTA) in poultry feed samples (mixed types) along with different poultry feed ingredients collected from different farms and market of Lahore, Pakistan. The whole year (2012-13) was divided into three sub-periods depending upon environmental conditions i.e. July-October (hot and humid), November-February (winter) and March-June (moderate). During each sub-period 120 samples were collected for each feed and each ingredient constituting a total of 840 samples (120x7 of feed and feed ingredients) in each sub-period...
February 20, 2017: British Poultry Science
https://www.readbyqxmd.com/read/28274458/a-study-on-accumulation-of-volatile-organic-compounds-during-ochratoxin-a-biosynthesis-and-characterization-of-the-correlation-in-aspergillus-carbonarius-isolated-from-grape-and-dried-vine-fruit
#8
Xiaoxu Zhang, Zhan Cheng, Liyan Ma, Jingming Li
Volatile organic compounds (VOCs) and ochratoxin A (OTA) were detected in Aspergillus carbonarius strains (AF, SD26 and SD27) during a 7-day growing period, using HS-SPME-GC-MS and HPLC-MS/MS, respectively. Results showed that 33 VOCs were detected in these strains. The AF strain showed the different sesquiterpene profile compared with the other strains. Principal component analysis revealed that the AF strain was segregated from the other two strains regarding the VOC profile, especially the sesquiterpene profile...
July 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28267294/comprehensive-proteomic-analysis-of-penicillium-verrucosum
#9
Katharina Nöbauer, Karin Hummel, Corina Mayrhofer, Maike Ahrens, Francis M C Setyabudi, Martin Eisenacher, Ebrahim Razzazi-Fazeli
Mass spectrometric identification of proteins in species lacking validated sequence information is a major problem in veterinary science. In the present study we used ochratoxin A (OTA) producing Penicillium verrucosum to identify and quantitatively analyse proteins of an organism with yet no protein information available. The work presented here aimed to provide a comprehensive protein identification of P. verrucosum using shotgun proteomics. We were able to identify 3631 proteins in an "ab initio" translated database from DNA sequences of P...
March 7, 2017: Proteomics
https://www.readbyqxmd.com/read/28264472/silver-nanoparticle-based-fluorescence-quenching-lateral-flow-immunoassay-for-sensitive-detection-of-ochratoxin-a-in-grape-juice-and-wine
#10
Hu Jiang, Xiangmin Li, Ying Xiong, Ke Pei, Lijuan Nie, Yonghua Xiong
A silver nanoparticle (AgNP)-based fluorescence-quenching lateral flow immunoassay with competitive format (cLFIA) was developed for sensitive detection of ochratoxin A (OTA) in grape juice and wine samples in the present study. The Ru(phen) 3 2 + -doped silica nanoparticles (RuNPs) were sprayed on the test and control line zones as background fluorescence signals. The AgNPs were designed as the fluorescence quenchers of RuNPs because they can block the exciting light transferring to the RuNP molecules. The proposed method exhibited high sensitivity for OTA detection, with a detection limit of 0...
February 28, 2017: Toxins
https://www.readbyqxmd.com/read/28264463/effects-of-electron-beam-irradiation-on-zearalenone-and-ochratoxin-a-in-naturally-contaminated-corn-and-corn-quality-parameters
#11
Xiaohu Luo, Lijun Qi, Yuntao Liu, Ren Wang, Dan Yang, Ke Li, Li Wang, Yanan Li, Yuwei Zhang, Zhengxing Chen
Zearalenone (ZEN) and ochratoxin A (OTA) are secondary toxic metabolites widely present in grains and grain products. In this study, the effects of electron beam irradiation (EBI) on ZEN and OTA in corn and the quality of irradiated corn were investigated. Results indicated that EBI significantly affected ZEN and OTA. The degradation rates of ZEN and OTA at 10 kGy in solution were 65.6% and 75.2%, respectively. The initial amounts significantly affected the degradation rate. ZEN and OTA in corn were decreased by the irradiation dose, and their degradation rates at 50 kGy were 71...
February 27, 2017: Toxins
https://www.readbyqxmd.com/read/28263864/the-need-to-revisit-ochratoxin-a-risk-in-light-of-diabetes-obesity-and-chronic-kidney-disease-prevalence
#12
Chen Chen, Felicia Wu
Ochratoxin A (OTA) is a mycotoxin, or fungal toxin, that contaminates multiple foodstuffs worldwide. Affected commodities include oats, wheat, maize, barley, raisins and other dried vine fruits, wine, beer, coffee, and cocoa. Although OTA has been shown to cause kidney disease, including kidney cancer, in multiple animal species, the impact of dietary OTA on human health from a global perspective has been less clear. Several epidemiological studies suggest an association between OTA exposure and human kidney disease, but evidence of causality has been limited...
March 2, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28251704/ochratoxin-a-cytotoxicity-on-madin-darby-canine-kidney-cells-in-the-presence-of-alpha-tocopherol-effects-on-cell-viability-and-tight-junctions
#13
E Fusi, C Giromini, R Rebucci, L Pinotti, V Caprarulo, F Cheli, F Vitari, C Domeneghini, A Baldi
Ochratoxin A (OTA) is a potent nephrotoxic fungi metabolite that affects animal and human health. At the cellular level, OTA is able to alter functions and viability by several mechanisms of action. Several strategies to counteract its toxicity have been studied. We investigated the role of α-tocopherol in counteracting OTA oxidative damage in Madin-Darby canine kidney (MDCK) cells by pre-incubating the cells for 3 hr with the antioxidant (1 nm, 10 μm) and then adding OTA (0-1.2 μg/ml) for the following 24 hr...
March 1, 2017: Journal of Animal Physiology and Animal Nutrition
https://www.readbyqxmd.com/read/28241497/is-gamma-radiation-suitable-to-preserve-phenolic-compounds-and-to-decontaminate-mycotoxins-in-aromatic-plants-a-case-study-with-aloysia-citrodora-pal%C3%A3-u
#14
Eliana Pereira, Lillian Barros, Amilcar L Antonio, Sandra Cabo Verde, Celestino Santos-Buelga, Isabel C F R Ferreira, Paula Rodrigues
This study aimed to determine the effect of gamma radiation on the preservation of phenolic compounds and on decontamination of dry herbs in terms of ochratoxin A (OTA) and aflatoxin B1 (AFB1), using Aloysia citrodora Paláu as a case study. For this purpose, artificially contaminated dry leaves were submitted to gamma radiation at different doses (1, 5, and 10 kGy; at dose rate of 1.7 kGy/h). Phenolic compounds were analysed by HPLC-DAD-ESI/MS and mycotoxin levels were determined by HPLC-fluorescence. Eleven phenolic compounds were identified in the samples and despite the apparent degradation of some compounds (namely verbasoside), 1 and 10 kGy doses point to a preservation of the majority of the compounds...
February 23, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28241411/determination-of-mycotoxin-production-of-fusarium-species-in-genetically-modified-maize-varieties-by-quantitative-flow-immunocytometry
#15
Hajnalka Bánáti, Béla Darvas, Szilvia Fehér-Tóth, Árpád Czéh, András Székács
Levels of mycotoxins produced by Fusarium species in genetically modified (GM) and near-isogenic maize, were determined using multi-analyte, microbead-based flow immunocytometry with fluorescence detection, for the parallel quantitative determination of fumonisin B1, deoxynivalenol, zearalenone, T-2, ochratoxin A, and aflatoxin B1. Maize varieties included the genetic events MON 810 and DAS-59122-7, and their isogenic counterparts. Cobs were artificially infested by F. verticillioides and F. proliferatum conidia, and contained F...
February 22, 2017: Toxins
https://www.readbyqxmd.com/read/28240164/effects-of-dietary-mycotoxins-on-gut-microbiome
#16
Kexin Du, C Wang, Ping Liu, Yuan Li, Xi Ma
The harmful effects of mycotoxins on intestinal health have received worldwide attention. Mycotoxins are toxic secondary metabolites produced by filamentous fungi, and include aflatoxins, ochratoxins, patulin, fumonisins, zearalenone, trichothecenes, and ergot alkaloids. Insuring the absence or low levels of mycotoxins is critical for food and feed safety. Currently, the studies in this field have illuminated the adverse effects of mycotoxins on gut health including intestinal integrity and the gut-associated immune system...
February 22, 2017: Protein and Peptide Letters
https://www.readbyqxmd.com/read/28221957/ochratoxin-a-concentrations-in-a-variety-of-grain-based-and-non-grain-based-foods-on-the-canadian-retail-market-from-2009-to-2014
#17
Beata Kolakowski, Sarah M O'Rourke, Henri P Bietlot, Karl Kurz, Barbara Aweryn
The extent of ochratoxin A (OTA) contamination of domestically produced foods sold across Canada was determined from 2009 to 2014 with sampling and testing occurring each fiscal year. Cereal-based, fruit-based, and soy-based food samples (n = 6,857) were analyzed. Almost half of the samples (3,200; 47%) did not contain detectable concentrations of OTA. The remaining 3,657 samples contained OTA at 0.040 to 631 ng/g. Wheat, oats, milled products of other grains (such as rye and buckwheat), and to a lesser extent corn products and their derived foods were the most significant potential sources of OTA exposure for the Canadian population...
December 2016: Journal of Food Protection
https://www.readbyqxmd.com/read/28221942/effect-of-fungicides-on-growth-and-ochratoxin-a-production-by-aspergillus-carbonarius-from-brazilian-wine-grapes
#18
Michelle F Terra, Nathasha de A Lira, Fabiana R F Passamani, Wilder Douglas Santiago, Maria das Graças Cardoso, Luís Roberto Batista
Prevention in the field of mycotoxin-producing fungi is the most effective strategy for controlling the presence of mycotoxins in foods. Chemical fungicides are widely used to protect crops, so their implications on mycotoxin production need to be considered. Therefore, the aim of this study was to evaluate the effect in vitro and on grapes of five fungicides commonly used on grape cultures in Brazil on Aspergillus carbonarius growth and ochratoxin A (OTA) production. At the doses recommended by manufacturers, most fungicides significantly reduced A...
September 2016: Journal of Food Protection
https://www.readbyqxmd.com/read/28221848/heat-stability-of-ochratoxin-a-in-an-aqueous-buffered-model-system
#19
Samjhana Dahal, Hyun Jung Lee, Kejia Gu, Dojin Ryu
Ochratoxin A (OTA) represents one of the most widespread mycotoxins in agricultural commodities in the world and is considered a possible human carcinogen with its potent nephrotoxicity. OTA is stable under most food processing conditions; however, higher-temperature treatment may reduce OTA content in foods. Since OTA can be found in processed products destined for both human and animal consumption, factors affecting its stability or reduction during thermal processes were investigated here. The reduction of OTA was measured during various heating times (up to 60 min) at different temperatures (100, 125, 150, 175, and 200°C) in aqueous buffer solutions at different pHs (pH 4, 7, and 10)...
October 2016: Journal of Food Protection
https://www.readbyqxmd.com/read/28218865/occurrence-of-ochratoxin-a-in-infant-foods-in-the-united-states
#20
Jack Cappozzo, Lauren Jackson, Hyun Jung Lee, Wei Zhou, Fadwa Al-Taher, Jerry Zweigenbaum, Dojin Ryu
Ochratoxin A (OTA) is a possible human carcinogen and occurs frequently in cereal grain, soy, and other agricultural commodities. Infants and young children may be more susceptible to contaminants than adults because of their lower body weight, higher metabolic rate, reduced ability to detoxify food toxicants, and more restricted diet. The purpose of this study was to investigate the occurrence and levels of OTA in infant formula and infant cereal products available in the U.S. market. In the present study, 98 powdered infant formula (milk- and soy-based) samples and 155 infant cereal (barley-, rice-, oat-, wheat-, and mixed grain-based) products were collected from different retail locations in the United States over a 2-year period...
February 2017: Journal of Food Protection
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