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Analytical Toxicology

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https://www.readbyqxmd.com/read/28417172/simultaneous-determination-of-multiclass-pesticide-residues-in-human-plasma-using-a-mini-quechers-method
#1
Anshuman Srivastava, Satyajeet Rai, Ashish Kumar Sonker, Kajal Karsauliya, Chandra Prabha Pandey, Sheelendra Pratap Singh
Blood is one of the most assessable matrices for the determination of pesticide residue exposure in humans. Effective sample preparation/cleanup of biological samples is very important in the development of a sensitive, reproducible, and robust method. In the present study, a simple, cost-effective, and rapid gas chromatography-tandem mass spectrometry method has been developed and validated for simultaneous analysis of 31 multiclass (organophosphates, organochlorines, and synthetic pyrethroids) pesticide residues in human plasma by means of a mini QuEChERS (quick, easy, cheap, effective, rugged, and safe) method...
April 17, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28415884/alcohol-quantification-recent-insights-into-amperometric-enzyme-biosensors
#2
Vinita Hooda, Vikas Kumar, Anjum Gahlaut, Vikas Hooda
Biosensors are the switching channels that make sense. The biosensors have found an empirical role in health applications (e.g. clinical diagnostics) as they represent the technological counterpart of living senses. On a global scale, alcohol analysis is indispensable for criminal justice systems, monitoring medical conditions of HIV patients & pregnant women as well as public safety issues regarding pilots, metro drivers, doctors etc. For addressing the clinical and toxicological problems, much advancement in the improvement of biosensors have been witnessed in recent decades...
April 17, 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/28403803/metabolic-profile-of-flunitrazepam-clinical-and-forensic-toxicological-aspects
#3
Ricardo Jorge Dinis-Oliveira
BACKGROUND: Flunitrazepam is a potent hypnotic, sedative, and amnestic drug used to treat insomnia and as a pre-anesthetic agent. The illicit practice in drug-facilitated sexual assault has been implicating important clinical and forensic issues. OBJECTIVE: In this work the metabolism of flunitrazepam was fully reviewed. METHODS: Flunitrazepam and related known metabolizing enzymes and metabolites were searched in books and in PubMed (U.S...
April 7, 2017: Drug Metabolism Letters
https://www.readbyqxmd.com/read/28402627/strategy-for-the-quantitation-of-a-protein-conjugate-via-hybrid-immunocapture-liquid-chromatography-with-sequential-hrms-and-srm-based-lc-ms-ms-analyses
#4
Yue Zhao, Guowen Liu, Xiling Yuan, Jinping Gan, Jon E Peterson, Jim X Shen
With the development of modern instrumentation and technologies, mass spectrometry based assays have played an important role in protein bioanalysis. We have developed a novel strategy by combining the "bottom-up" and "top-down" approaches using both high-resolution (HRMS) and selected reaction monitoring (SRM) based mass spectrometric detection to quantify a positron emission tomography (PET) detection tracer for an oncology marker. Monkey plasma samples were processed by immunocapture purification, followed by liquid chromatography (LC) with HRMS full scan analysis...
April 21, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28393558/supraventricular-tachycardia-and-acute-confusion-following-ingestion-of-e-cigarette-fluid-containing-ab-fubinaca-and-adb-fubinaca-a-case-report-with-quantitative-analysis-of-serum-drug-concentrations
#5
Rex Pui Kin Lam, Magdalene Huen Yin Tang, Siu Chung Leung, Yeow Kuan Chong, Matthew Sik Hon Tsui, Tony Wing Lai Mak
BACKGROUND: AB-FUBINACA and ADB-FUBINACA are structurally similar synthetic cannabinoids with potent CB1 receptor agonistic effects. Very little is known about their pharmacology and toxicology. OBJECTIVE: To report a case of supraventricular tachycardia and acute confusion after ingestion of e-cigarette fluid containing AB-FUBINACA and ADB-FUBINACA, with quantitative analysis of the serum drug concentrations. CASE REPORT: A healthy 24-year-old man ingested two drops of e-cigarette fluid which were later found to contain AB-FUBINACA and ADB-FUBINACA...
April 10, 2017: Clinical Toxicology
https://www.readbyqxmd.com/read/28393481/comparative-study-of-therapeutic-antibody-candidates-derived-from-mini-pool-and-clonal-cell-lines
#6
Lianchun Fan, Giovanni Rizzi, Kathleen Bierilo, Jun Tian, Joon Chong Yee, Reb Russel, Tapan Das
The long journey of developing a drug from initial discovery target identification to regulatory approval often leaves many patients with missed window of opportunities. Both regulatory agencies and biopharmaceutical industry continue to develop creative approaches to shorten the time of new drug development in order to deliver life-saving medicine to patients. Historically, drug substance materials to support the toxicology and early phase clinical study can only be manufactured after creating the final Master Cell Bank (MCB) of the clonally-derived cell line, which normally takes 1-2 years...
April 10, 2017: Biotechnology Progress
https://www.readbyqxmd.com/read/28389456/analytic-characterization-of-biosimilars
#7
Peter M Sullivan, Lisa M DiGrazia
PURPOSE: The biosimilar development process, comparability for biological agents, and analytic characterization of biosimilars are described. SUMMARY: Healthcare providers must understand the requirements for biosimilar approval, including the science behind biosimilar development and testing that contributes to the totality of evidence. The foundation of development is to demonstrate that a biosimilar is highly similar to the reference product through analytic characterization...
April 15, 2017: American Journal of Health-system Pharmacy: AJHP
https://www.readbyqxmd.com/read/28381719/practice-of-regulatory-science-drug-development
#8
Toru Kawanishi
 The practice of regulatory science (RS) for drug development is described. In the course material for education in pharmaceutical sciences drafted by the RS Division of the Pharmaceutical Society of Japan, RS for pharmaceuticals is defined as the science of predicting, assessing, and judging the quality, efficacy, and safety of pharmaceutical products throughout their lifespan. RS is also described as an integrated science based on basic and applied biomedical sciences, including analytical chemistry, biochemistry, pharmacology, toxicology, genetics, biostatistics, epidemiology, and clinical trial methodology, and social sciences such as decision science, risk assessment, and communication science...
2017: Yakugaku Zasshi: Journal of the Pharmaceutical Society of Japan
https://www.readbyqxmd.com/read/28381359/chemical-characterisation-of-aerosols-emitted-by-electronic-cigarettes-using-thermal-desorption-gas-chromatography-time-of-flight-mass-spectrometry
#9
Christopher Rawlinson, Stuart Martin, Justin Frosina, Chris Wright
A non-targeted analytical method, using thermal desorption - gas chromatography - time of flight mass spectrometry, to detect, identify and semi-quantify volatile and semi-volatile organic constituents of e-cigarette aerosols is presented. A heart-cutting process with a Deans Switch has been applied to avoid saturation of the mass analyser by high-abundance bulk components. Between 30 and 90 compounds were detected in four aerosol samples generated by e-cigarettes, depending on the added flavourings. The method analyses in a single 80mL, 3-s puff, GC-amenable compounds with volatilities ranging between those of propane (C3) and octacosane (C28) and abundance greater than approximately 5ng...
March 25, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28379393/profiting-from-probability-combining-low-and-high-probability-isotopes-as-a-tool-extending-the-dynamic-range-of-an-assay-measuring-amphetamine-and-methamphetamine-in-urine
#10
Anna M Miller, Melissa M Goggin, An Nguyen, Stephanie D Gozum, Gregory C Janis
A wide range of concentrations are frequently observed when measuring drugs of abuse in urine toxicology samples; this is especially true for amphetamine and methamphetamine. Routine liquid chromatography-tandem mass spectrometry confirmatory methods commonly anchored at a 50 ng/mL lower limit of quantitation can span approximately a 100-fold concentration range before regions of non-linearity are reached deteriorating accurate quantitation and qualitative assessments. In our experience, approximately a quarter of amphetamine and methamphetamine positive samples are above a 5,000 ng/mL upper limit of quantitation and thus require reanalysis with dilution for accurate quantitative and acceptable qualitative results...
April 4, 2017: Journal of Analytical Toxicology
https://www.readbyqxmd.com/read/28372226/multiresidue-determination-of-veterinary-medicines-in-lyophilized-egg-albumen-with-subsequent-consumer-exposure-evaluation
#11
Marta Piątkowska, Małgorzata Gbylik-Sikorska, Anna Gajda, Piotr Jedziniak, Tomasz Błądek, Jan Żmudzki, Andrzej Posyniak
The process of lyophilization causes that the veterinary drugs residues present in egg albumen do not decompose, as it takes place during the process of high-temperature drying. Thus, lyophilized albumen may be a potential source of their residues for consumers. As a consequence, reliable methods for the determination of veterinary medicinal products from egg albumen are needed. The method for the determination of 85 analytes in lyophilized egg albumen was developed and successfully validated. The recoveries were between 84 and 110%, within laboratory repeatability and reproducibility - in the range of 3...
August 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28366215/liquid-chromatography-high-resolution-tandem-mass-spectrometry-using-orbitrap-technology-for-comprehensive-screening-to-detect-drugs-and-their-metabolites-in-blood-plasma
#12
Andreas G Helfer, Julian A Michely, Armin A Weber, Markus R Meyer, Hans H Maurer
Orbitrap technology was successfully applied for broad metabolite-based LC-high resolution (HR)-MS screening of drugs in clinical and forensic toxicology. This paper aims to elucidate whether this technology can also be used for a corresponding blood plasma screening after simple precipitation without or with consecutive on-line extraction using turbulent flow chromatography (TurboFlow). The analytes were separated within 10 min and detected by a Q-Exactive mass spectrometer in full scan mode after positive/negative switching...
May 1, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28365515/pharmacokinetic-properties-of-the-synthetic-cannabinoid-jwh-018-and-of-its-metabolites-in-serum-after-inhalation
#13
Stefan W Toennes, Anna Geraths, Werner Pogoda, Alexander Paulke, Cora Wunder, Eef L Theunissen, Johannes G Ramaekers
Each year, synthetic cannabinoids are occurring in high numbers in the illicit drug market, but data on their pharmacology and toxicology are scarcely available. Therefore, a pilot study was performed to assess adverse effects of JWH-018, which is one of the oldest and best known synthetic cannabinoids. Six subjects inhaled smoke from 2 and 3mg JWH-018. The drug and nine of its metabolites were analyzed in their blood samples taken during the following 12h by liquid chromatography-mass spectrometry (LC-MSMS)...
June 5, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28359849/a-review-on-traditional-uses-phytochemistry-pharmacology-pharmacokinetics-and-toxicology-of-the-genus-peganum
#14
REVIEW
Shuping Li, Xuemei Cheng, Changhong Wang
ETHNOPHARMACOLOGICAL RELEVANCE: The plants of the genus Peganum have a long history as a Chinese traditional medicine for the treatment of cough, hypertension, diabetes, asthma, jaundice, colic, lumbago, and many other human ailments. Additionally, the plants can be used as an amulet against evil-eye, dye and so on, which have become increasingly popular in Asia, Iran, Northwest India, and North Africa. AIM OF THE REVIEW: The present paper reviewed the ethnopharmacology, phytochemistry, analytical methods, biological activities, metabolism, pharmacokinetics, toxicology, and drug interaction of the genus Peganum in order to assess the ethnopharmacological use and to explore therapeutic potentials and future opportunities for research...
May 5, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/28342304/rapid-profiling-and-pharmacokinetic-studies-of-major-compounds-in-crude-extract-from-polygonum-multiflorum-by-uhplc-q-tof-ms-and-uplc-ms-ms
#15
Linlin Wang, Mangmang Sang, Erwei Liu, Prince Osei Banahene, Yi Zhang, Tao Wang, Lifeng Han, Xiumei Gao
A reliable, rapid analytical method was established for characterization of constituents in the ethanol extract of Polygonum multiflorum by combining an ultra-high performance liquid chromatography with quadrupole time-of-flight mass spectrometry (UHPLC-Q-TOF-MS). 131 constituents which including phenolic acids, stilbenes, flavones, anthraquinones, naphthalenes and their derivatives were identified or tentatively identified by using characteristic diagnostic fragment ions and references. The established method was further applied to analyze blood samples, and successfully identified 41 compounds which were absorbed through the gastrointestine in rats after administration the extract of P...
June 5, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28342178/return-of-the-lysergamides-part-iii-analytical-characterization-of-n-6-ethyl-6-norlysergic-acid-diethylamide-eth-lad-and-1-propionyl-eth-lad-1p-eth-lad
#16
Simon D Brandt, Pierce V Kavanagh, Folker Westphal, Simon P Elliott, Jason Wallach, Alexander Stratford, David E Nichols, Adam L Halberstadt
The psychoactive properties of lysergic acid diethylamide (LSD) have fascinated scientists across disciplines and the exploration of other analogs and derivatives has been motivated by deepening the understanding of ligand-receptor interactions at the molecular level as well as by the search for new therapeutics. Several LSD congeners have appeared on the new psychoactive substances (NPS) market in the form of blotters or powders. Examples include 1-propionyl-LSD (1P-LSD), AL-LAD and LSZ. The absence of analytical data for novel compounds is a frequent challenge encountered in clinical and toxicological investigations...
March 24, 2017: Drug Testing and Analysis
https://www.readbyqxmd.com/read/28338527/a-slight-smell-of-lemon%C3%A2-a-case-report
#17
Catherine Feliu, Yoann Cazaubon, Aurélie Fouley, Hélène Guillemin, Claire Gozalo, Zoubir Djerada
We present here an example of urine substituted with a yellow cleaning product that leads us to develop the main risks to consider in urine toxicology analysis, i.e., adulteration and analytical interferences, and how to deal with them. This grand round highlights the importance of the dialogue between the clinician and a TDM consultant for optimal care of the patient.
March 23, 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/28336469/a-review-of-the-ethnopharmacology-phytochemistry-and-pharmacology-of-notopterygium-incisum
#18
REVIEW
John Teye Azietaku, Huifen Ma, Xie-An Yu, Jin Li, Mahmood Brobbey Oppong, Jun Cao, Mingrui An, Yan-Xu Chang
ETHNOPHARMACOLOGICAL RELEVANCE: Notopterygium incisum Ting ex H.T. Chang, known in Chinese as 'Qianghuo' is a traditional Chinese medicinal herb with the rhizome and roots associated with meridians of the kidney and urinary bladder. It is pungent, bitter and warm in nature. It has been used over the years to disperse cold, prevent painful obstructions from wind, damp and warm pain. It has also been used with other herbs to treat wind-cold exterior syndrome and wind-cold-damp bi-syndromes and has been known to grow well in regions of high altitude such as Gansu, Tibet etc...
March 20, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/28335036/validated-method-for-the-screening-and-quantification-of-baclofen-gabapentin-and-pregabalin-in-human-post-mortem-whole-blood-using-protein-precipitation-and-liquid-chromatography-tandem-mass-spectrometry
#19
Limon Nahar, Amy Smith, Rajan Patel, Rebecca Andrews, Sue Paterson
There has been a rapid increase in the number of prescriptions for baclofen (BLF), gabapentin (GBP) and pregabalin (PGL) in the UK since their introduction to therapy. Recent studies across the European Union and USA have shown the illicit abuse potential of these drugs and deaths have been observed. A simple, reliable and fully validated method was developed for the screening and quantification of BLF, GBP and PGL in human post-mortem (PM) blood. The analytes and their deuterated analogs as internal standard were extracted from blood using a single addition acetonitrile protein precipitation reaction followed by analysis using liquid chromatography-tandem mass spectrometry (LC-MS-MS) with triggered dynamic multiple reaction monitoring mode for simultaneous confirmation and quantification...
March 10, 2017: Journal of Analytical Toxicology
https://www.readbyqxmd.com/read/28334957/quechers-based-method-for-pesticides-analysis-in-adipose-tissue-associated-with-rat-ovaries
#20
Nathalie Zamariola, Pedro Toledo Netto, Carla Adriene da Silva Franchi, João Lauro Viana de Camargo, Mary Rosa Rodrigues de Marchi
The concomitant exposure to low doses of various pesticides is one of the most relevant issues in human toxicology today. An experimental toxicology study was developed to evaluate the effects of this type of exposure on the reproductive capacity of females of three species of rats that were exposed to mixtures of dicofol, dieldrin, endosulfan and permethrin at low doses (LOAEL and NOAEL). In this context, we have developed a method for determining pesticides in adipose tissue (0.5 g, 49% lipid) associated with the ovaries, based on the QuEChERS (quick, easy, cheap, effective, rugged and safe) strategy...
March 14, 2017: Journal of Analytical Toxicology
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