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Analytical Toxicology

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https://www.readbyqxmd.com/read/28719868/quantitative-meta-analytic-approaches-for-the-systematic-synthesis-of-data-and-hazard-identification-a-case-study-of-decreased-pain-sensitivity-due-to-trimethylbenzene-exposure
#1
J Allen Davis, Andrew Kraft
Traditionally, human health risk assessments have relied on qualitative approaches for hazard identification, which involves weight of evidence determinations that integrate evidence across multiple studies. Recently, the National Research Council has recommended the development of quantitative approaches for evidence integration, including the application of meta-analyses, to help summarize and evaluate the results of a systematic review. In the meta-analytic approach, a pooled effect size is calculated after consideration of multiple potential confounding factors in order to determine whether the entire database under consideration indicates a chemical is a hazard...
July 15, 2017: Environmental Research
https://www.readbyqxmd.com/read/28719747/detection-of-fumonisins-in-fresh-and-dehydrated-commercial-garlic
#2
Stefano Tonti, Mara Mandrioli, Paola Nipoti, Annamaria Pisi, Tullia Gallina Toschi, Antonio Prodi
An epidemic fungal disease caused by Fusarium proliferatum, responsible for fumonisin production (FB1, FB2, and FB3), has been reported in the main garlic-producing countries in recent years. Fumonisins are a group of structurally related toxic metabolites produced by this pathogen. The aim of this work was to establish an ELISA procedure, mostly applied to cereals, that is suitable for fumonisin detection in garlic, and compare these results with those obtained by HPLC and screening of fresh and dehydrated garlic for toxicological risk...
July 18, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28714573/assessment-of-the-dna-damaging-potential-of-environmental-chemicals-using-a-quantitative-high-throughput-screening-approach-to-measure-p53-activation
#3
Kristine L Witt, Jui-Hua Hsieh, Stephanie L Smith-Roe, Menghang Xia, Ruili Huang, Jinghua Zhao, Scott S Auerbach, Junguk Hur, Raymond R Tice
Genotoxicity potential is a critical component of any comprehensive toxicological profile. Compounds that induce DNA or chromosomal damage often activate p53, a transcription factor essential to cell cycle regulation. Thus, within the US Tox21 Program, we screened a library of ∼10,000 (∼8,300 unique) environmental compounds and drugs for activation of the p53-signaling pathway using a quantitative high-throughput screening assay employing HCT-116 cells (p53(+/+) ) containing a stably integrated β-lactamase reporter gene under control of the p53 response element (p53RE)...
July 17, 2017: Environmental and Molecular Mutagenesis
https://www.readbyqxmd.com/read/28714411/pharmacology-and-literature-review-based-on-related-death-and-non-fatal-case-reports-of-the-benzofurans-and-benzodifurans-designer-drugs
#4
Bernardino Barceló Martín, Isabel Gomila
BACKGROUND: Benzofurans and benzodifurans are two groups of psychoactive substances that had originally been synthesized for research purpose. Benzofurans' structure is quite similar to the known recreational drug 3,4-methylenedioxymethamphetamine together with its active metabolite 3,4-methylenedioxyamphetamine. Benzodifurans are closely related to phenethylamines, but have more hallucinogens effects and much longer duration of action. This study aims to review the accessible evidence-based literature on benzofurans and benzodifurans pharmacology and toxicology...
July 14, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28714407/update-of-standard-practices-for-new-method-validation-in-forensic-toxicology
#5
Sarah M R Wille, Wim Coucke, Thierry De Baere, Frank T Peters
: International agreement concerning validation guidelines is important as reporting reliable analytical data is the backbone of forensic bioanalytical research and applications. Guidelines such as those provided by the US Food and Drug Administration (FDA), the European Medicines Agency (EMA), the German speaking Gesellschaft für Toxikologie und Forensische Chemie (GTFCH) and the Scientific Working Group of Forensic Toxicology (SWGTOX) provide a standard for fundamental validation parameters such as selectivity, matrix effects, method limits, calibration, accuracy and stability, as well as other parameters such as carryover, dilution integrity and incurred sample reanalysis...
July 14, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28710970/validation-of-a-probe-for-assessing-deconjugation-of-glucuronide-and-sulfate-phase-ii-metabolites-assayed-through-lc-ms-ms-in-biological-matrices
#6
Claire Grignon, Antoine Dupuis, Marion Albouy-Llaty, Maxime Condylis, Laurence Barrier, Pascal Carato, Bertrand Brunet, Virginie Migeot, Nicolas Venisse
LC-MS/MS has been proposed in various areas such as Therapeutic Drug Monitoring (TDM), Human Biomonitoring (HBM), disease diagnosis, clinical toxicology and doping control to identify and quantify chemical parents and their metabolites in biological matrices. To determine the total content of a xenobiotic (unconjugated+conjugated forms), an enzymatic hydrolysis step is required. Most studies in the literature have not controlled the effectiveness of the deconjugation process because no method has been described for that purpose...
July 10, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28710844/reliable-hplc-separation-vibrational-circular-dichroism-spectra-and-absolute-configurations-of-isoborneol-enantiomers
#7
Rui-Qi Gao, Jun Fan, Qi Tan, Dong Guo, Tao Chen, Ru-Jian He, Dan Li, Hui Zhang, Wei-Guang Zhang
Resolution of chiral compounds has played an important role in the pharmaceutical field, involving detailed studies of pharmacokinetics, physiological, toxicological, and metabolic activities of enantiomers. Herein, a reliable method by high-performance liquid chromatography (HPLC) coupled with an optical rotation detector was developed to separate isoborneol enantiomers. A cellulose tris(3, 5-dimethylphenylcarbamate)-coated chiral stationary phase showed the best separation performance for isoborneol enantiomers in the normal phase among four polysaccharide chiral packings...
July 15, 2017: Chirality
https://www.readbyqxmd.com/read/28710651/intoxication-caused-by-new-psychostimulants-analytical-methods-to-disclose-acute-and-chronic-use-of-benzofurans-and-ethylphenidate
#8
Bernardino Barceló, Isabel Gomila, Maria Concetta Rotolo, Emilia Marchei, Chrystalla Kyriakou, Simona Pichini, Carolina Roset, Miguel Ángel Elorza, Francesco Paolo Busardò
The acute and chronic toxicity of several new psychoactive substances (NPS) is unknown, and only little information is available on the pharmacology and toxicology, toxicokinetics, and detectability in body samples of such new compounds. We here propose analytical methods to disclose acute and chronic use of two types of new psychostimulants: benzofurans and ethylphenidate and we applied them to a real case of a subject attending Emergency Department with signs of acute intoxication due to psychotropic drug(s)...
July 15, 2017: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/28698155/in-silico-approach-to-safety-of-botanical-dietary-supplement-ingredients-utilizing-constituent-level-characterization
#9
Jason G Little, Daniel S Marsman, Timothy R Baker, Catherine Mahony
Botanicals used in dietary supplements industry can have toxicology concerns related to endpoint gaps that cannot be fully resolved by a history of use, or existence of conflicting safety data. However, traditional toxicological studies on botanicals are scientifically and pragmatically challenging due to testing of complex mixtures of constituents, cost, time, and animal usage. Alternatively, we developed an in silico decision-tree approach to address data gaps and inform need for further studies by toxicologically evaluating the chemical composition of botanicals...
July 8, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28691766/detection-of-metabolites-of-the-new-synthetic-cannabinoid-cumyl-4cn-binaca-in-authentic-urine-samples-and-human-liver-microsomes-using-high-resolution-mass-spectrometry
#10
Yeter Erol Ozturk, Oya Yeter, Serkan Ozturk, Goksun Karakus, Ismail Ates, Yalçın Buyuk, Turkan Yurdun
CUMYL-4CN-BINACA(1-(4-cyanobutyl)-N-(2-phenylpropan-2-yl)-1H-indazole-3-carboxamide) is a recently introduced indazole-3-carboxamide type synthetic cannabinoid (SC) that was detected in herbal incense seized by of the Council of Forensic Medicine Istanbul Narcotics Department in May 2016 in Turkey. Recently introduced SCs are not detected in routine toxicological analysis; therefore, analytical methods to measure these compounds are in demand. The present study aims to identify urinary marker metabolites of CUMYL-4CN-BINACA by investigating its metabolism in human liver microsomes and to confirm the results in authentic urine samples (n=80)...
July 10, 2017: Drug Testing and Analysis
https://www.readbyqxmd.com/read/28681613/the-toxicological-significance-of-post-mortem-drug-concentrations-in-bile
#11
Robin E Ferner, Jeffrey K Aronson
CONTEXT: Some authors have proposed that post-mortem drug concentrations in bile are useful in estimating concentrations in blood. Both The International Association of Forensic Toxicologists (TIAFT) and the US Federal Aviation Administration recommend that samples of bile should be obtained in some circumstances. Furthermore, standard toxicological texts compare blood and bile concentrations, implying that concentrations in bile are of forensic value. AIM: To review the evidence on simultaneous measurements of blood and bile drug concentrations reported in the medical literature...
July 6, 2017: Clinical Toxicology
https://www.readbyqxmd.com/read/28677500/good-practices-in-forensic-toxicology
#12
Olaf H Drummer
This manuscript provides an overview for analysts, medical and scientific investigators, and laboratory administrators, the range of factors that should be considered to implement best practice forensic toxicology. These include laboratory influence over the collection of specimens, their proper transport and chain-of-custody before arrival in the laboratory. In addition, the laboratory needs to ensure properly trained staff use suitably validated and documented analytical procedures that meet the intended purpose and type of case in an accredited or suitably quality oriented management system...
July 4, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28677498/nails-in-forensic-toxicology-an-update
#13
Renata Solimini, Adele Minutillo, Chrystalla Kyriakou, Simona Pichini, Roberta Pacifici, Francesco Paolo Busardò
BACKGROUND: The analysis of nails as a keratinized matrix to detect drugs or illicit substances has been increasingly used in forensic and clinical toxicology as a complementary test, especially for the specific characteristics of stably accumulating substances for long periods of time. This allows a retrospective investigation of chronic drug abuse, monitoring continuous drug or pharmaceutical use, reveal in utero drug exposure or environmental exposures. METHODS: We herein review the recent literature investigating drug incorporation mechanisms and drug detection in nails for forensic toxicological purposes...
July 4, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28676265/ultrafine-particles-ufps-from-domestic-wood-stoves-genotoxicity-in-human-lung-carcinoma-a549-cells
#14
Marabini Laura, Ozgen Senem, Turacchi Silvia, Aminti Stefania, Arnaboldi Francesca, Lonati Giovanni, Fermo Paola, Corbella Lorenza, Valli Gianluigi, Bernardoni Vera, Dell'Acqua Manuela, Vecchi Roberta, Becagli Silvia, Caruso Donatella, Corrado L Galli, Marinovich Marina
In this paper, results on the potential toxicity of ultrafine particles (UFPs d<100nm) emitted by the combustion of logwood and pellet (hardwood and softwood) are reported. The data were collected during the TOBICUP (TOxicity of BIomass COmbustion generated Ultrafine Particles) project, carried out by a team composed of interdisciplinary research groups. The genotoxic evaluation was performed on A549 cells (human lung carcinomacells) using UFPs whose chemical composition was assessed by a suite of analytical techniques...
August 2017: Mutation Research
https://www.readbyqxmd.com/read/28671569/influence-of-environmental-factors-on-the-production-of-penitrems-a-f-by-penicillium-crustosum
#15
Svetlana A Kalinina, Annika Jagels, Benedikt Cramer, Rolf Geisen, Hans-Ulrich Humpf
Filamentous fungi produce a multitude of secondary metabolites, some of them known as mycotoxins, which are toxic to vertebrates and other animal groups in low concentrations. Among them, penitrems, which belong to the group of indole-diterpene mycotoxins, are synthesized by Penicillium and Aspergillus genera and exhibit potent tremorgenic effects. This is the first complex study of the penitrems A-F production under the influence of different abiotic factors, e.g., media, incubation time, temperature, pH, light, water activity, and carbon and nitrogen source as well as oxidative and salt stress...
July 1, 2017: Toxins
https://www.readbyqxmd.com/read/28668760/effect-of-contaminants-of-emerging-concern-on-liver-mitochondrial-function-in-chinook-salmon
#16
Andrew Yeh, David J Marcinek, James P Meador, Evan P Gallagher
We previously reported the bioaccumulation of contaminants of emerging concern (CECs), including pharmaceuticals and personal care products (PPCPs) and perfluorinated compounds, in field-collected juvenile Chinook salmon from urban estuaries of Puget Sound, WA (Meador et al., 2016). Although the toxicological impacts of CECs on salmon are poorly understood, several of the detected contaminants disrupt mitochondrial function in other species. Here, we sought to determine whether environmental exposures to CECs are associated with hepatic mitochondrial dysfunction in juvenile Chinook...
June 16, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28668480/a-new-challenge-in-forensic-toxicology-exemplified-by-a-case-of-murder-under-the-influence-of-a-synthetic-cannabinoid-am-2201
#17
Sebastian Rojek, Małgorzata Kłys, Martyna Maciów-Głąb, Karol Kula
Among new psychoactive substances (NPS) available on the narcotic market, a significant number consists of synthetic cannabinoids commonly known as smokable herbal "spice" and "K2", and which are legally treated as a legal alternative to marijuana. The dearth of information on the pharmacology of these intoxicants as they are introduced into the market has created the urgent need among healthcare providers for case studies on the substances belonging to this group, both in terms of the consequences of using such intoxicants, and in methods of detection...
June 24, 2017: Legal Medicine
https://www.readbyqxmd.com/read/28654780/development-and-validation-of-an-icp-ms-method-for-the-determination-of-elemental-impurities-in-tp-6076-active-pharmaceutical-ingredient-api-according-to-usp-%C3%A2-232%C3%A2-%C2%AA-%C3%A2-233%C3%A2-%C2%AA
#18
Osama Chahrour, John Malone, Mark Collins, Vrushali Salmon, Catherine Greenan, Amy Bombardier, Zhongze Ma, Nick Dunwoody
The new guidelines of the United States pharmacopeia (USP), European pharmacopeia (EP) and international conference on harmonization (ICH) regulating elemental impurities limits in pharmaceuticals signify the end of unspecific analysis of metals as outlined in USP 〈231〉. The new guidelines specify both daily doses and concentration/limits of elemental impurities in pharmaceutical final products, active pharmaceutical ingredients (API) and excipients. In chapter USP 〈233〉 method implementation, validation and quality control during the analytical process are described...
June 20, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28650900/a-high-throughput-hplc-ms-ms-assay-for-the-detection-quantification-and-simultaneous-structural-confirmation-of-136-drugs-and-metabolites-in-human-urine
#19
Jacek Klepacki, Baharak Davari, Marion Boulet, Ryan Lizarraga, Uwe Christians
BACKGROUND: Due to its superior sensitivity and specificity, multi-analyte high-performance liquid chromatography coupled with tandem mass spectrometry (HPLC-MS/MS) has become the gold standard in clinical toxicology. Although several qualitative and quantitative LC-MS/MS assays on various mass spectrometry platforms have been described in the literature, the majority of these methods either analyze only a limited number of compounds, and/or require tedious and time-consuming sample preparation...
June 22, 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/28650149/rplc-hilic-and-sfc-with-mass-spectrometry-polarity-extended-organic-molecule-screening-in-environmental-water-samples
#20
Stefan Bieber, Giorgia Greco, Sylvia Grosse, Thomas Letzel
Trace organic compounds are important in environmental analysis, because they impact water quality and introduce potential (eco)toxicological effects. Current analytical methods mostly rely on gas chromatography (GC) or reversed-phase liquid chromatography (RPLC) coupled with (tandem) mass spectrometry. However, neither method can easily separate very polar molecules. This study presents, two chromatographic separation strategies, a serial RPLC- hydrophilic interaction liquid chromatography (RPLC-HILIC) coupling and an analytical scale supercritical fluid chromatography (SFC) system, and validates their separation effectiveness as polarity-extended chromatographic methods for 274 environmentally relevant compounds...
June 26, 2017: Analytical Chemistry
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