Publications by authors named "Chris W Chronister"

The emergence of new psychoactive substances (NPS) and the number of new chemically diverse substances in the global illicit drug market have significantly increased over the last few years. Designer benzodiazepines are some of the most misused NPS worldwide, contributing to both nonfatal and fatal drug overdose cases. The use of desalkylgidazepam and bromazolam has recently emerged, and their prevalence has been internationally reported.

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The purpose of this study was to develop and validate a method to quantitate the veterinary sedative xylazine as well as 4-anilino-N-phenethylpiperidine (4-ANPP), acetyl fentanyl, fentanyl, norfentanyl, and p-fluorofentanyl in blood utilizing liquid chromatography tandem mass spectrometry. This method also qualitatively monitors for the presence of o-fluorofentanyl and m-fluorofentanyl isomers. UCT Clean Screen® DAU extraction columns were utilized to isolate the analytes in postmortem blood samples.

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Synthetic cathinones emerged on the novel psychoactive substance (NPS) drug market as alternatives to controlled stimulants and entactogens such as methamphetamine and 3,4-methylenedioxymethamphetamine. The majority of synthetic cathinones can be subclassified into two groups: beta-keto amphetamines (i.e.

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Novel synthetic opioids contribute considerably to the opioid epidemic, especially with the frequent emergence of structurally similar compounds. This case report describes a fatal intoxication involving 2-methyl AP-237. A 54-year-old Caucasian male was found deceased from an apparent drug overdose.

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Laws concerning the growing, selling and consuming of cannabis and its related products have been changing considerably over the last few years. The legalization of hemp in 2018 sparked an interest in ∆9-tetrahydrocannabinol (∆9-THC) isomers and analogs that are derived from hemp and sold with minimal oversight. One example is ∆8-tetrahydrocannabinol (∆8-THC).

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Article Synopsis
  • The opioid epidemic in the USA is increasingly characterized by the rise of fentanyl, particularly its isomer para-fluorofentanyl (p-FF), which became noticeable in overdose cases starting in late 2020.
  • A study aimed to identify p-FF in postmortem samples in Florida from October 2020 to April 2021, analyzing urine and blood from suspected overdose cases using advanced chromatography and mass spectrometry techniques.
  • Out of 370 suspected overdose cases, 27 tested positive for fluorofentanyl, with 14 specifically positive for p-FF; the detected blood concentrations of p-FF ranged from <2.5 ng/mL to 30 ng/mL, showing a higher average
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Synthetic stimulants are the largest class of novel psychoactive substances identified each year by forensic laboratories internationally. While hundreds of these drugs appear in drug powders, only a few proliferate in use among forensically relevant populations and eventually emerge in postmortem and clinical investigations. Beta-keto-methylenedioxyamphetamines (i.

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Between March 2017 and November 2018, 54 prisoner fatal overdose cases submitted to the University of Florida Forensic Toxicology Laboratory involved synthetic cannabinoids including 5F-ADB, FUB-AMB, 5F-AMB, MDMB-FUBINACA and AB-CHMINACA. Analysis of blood and urine samples was performed at NMS Labs (Horsham, PA) by liquid chromatography/tandem mass spectrometry screening, confirmatory and quantitative methods validated according to Scientific Working Group for Forensic Toxicology guidelines. This work highlights the importance of effective communication between toxicologists and medical examiners/coroners, and the value of public-private partnerships to provide coverage while laboratories work to update instrumentation and validate their own new methods to keep up with the challenges of emerging substances.

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In 2013, the Centers for Disease Control and Prevention released a warning regarding a new recreational drug, acetyl fentanyl. Acetyl fentanyl is a μ-opioid receptor agonist, and its pharmacological effects include euphoria, altered mood, miosis and central nervous system depression. The objective of this report was to develop a sensitive and specific method for the quantitation of acetyl fentanyl by gas chromatography-mass spectrometry in postmortem casework.

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Fentanyl induces pharmacological effects and abuse liability comparable to other prescription opioids and heroin. A surge in fentanyl-related fatalities has been periodically reported throughout the USA. The University of Florida Forensic Toxicology Laboratory observed a significant increase in fentanyl-related deaths starting in mid-2014.

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Synthetic cathinones are an emerging class of designer drugs, frequently with deceptive labels and a multitude of analogs to circumvent drug control regulations. Research regarding the pharmacological effects and toxicity of these amphetamine derivatives is scarce, heightening the risk to the public health and safety. The composition of synthetic cathinone products continually changes and laboratories began to notice ethylone-positive products in late 2011.

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Abuse of the psychoactive "designer drug" methylenedioxypyrovalerone (MDPV) has become a serious international public health concern because of the severity of its physical and behavioral toxicities. MDPV is the primary ingredient in so-called "bath salts," labeled as such to avoid criminal prosecution and has only been classified recently as a controlled substance in the United States and some other countries. However, it remains a danger because of illegal sources, including the Internet.

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Oxycodone is a semisynthetic opioid analgesic used in pain management. In the following method, gas chromatography-mass spectrometry (GC-MS) is used to determine the presence and concentration of the drug in blood and urine. The specimens are fortified with deuterated internal standard and a five-point calibration curve is constructed.

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The opioid and 6-acetylmorphine assays utilize gas chromatography-mass spectrometry (GC-MS) for the analysis of morphine, codeine, hydromorphone, hydrocodone, and 6-acetylmorphine in blood and urine. The specimens are fortified with deuterated internal standard and a five-point calibration curve is constructed. Specimens are extracted by mixed-mode solid phase extraction.

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Fentanyl is a potent, short-acting synthetic opioid analgesic. Fentanyl is measured in blood and urine following mixed-mode solid phase extraction. The specimens are fortified with deuterated internal standard and a five-point calibration curve is constructed.

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The benzodiazepine assay utilizes gas chromatography-mass spectrometry (GC-MS) for the analysis of diazepam, nordiazepam, oxazepam, temazepam, lorazepam, alpha-hydroxyalprazolam, and alpha-hydroxytriazolam in blood and urine. A separate assay is employed for the analysis of alprazolam. Prior to solid phase extraction, urine specimens are subjected to enzyme hydrolysis.

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Comprehensive and rapid screening of specimens that enter a postmortem forensic toxicology laboratory is essential. Although blood and urine specimens are most commonly utilized for immunoassay screening, this study illustrates the use of vitreous humor for similar purpose. Over a 2-year period, 1233 out of 5471 cases submitted for drug analysis were screened for the presence of opioids in vitreous humor by the Microgenics Cloned Enzyme Donor Immunoassay (CEDIA) DAU opiate assay.

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Amoxicillin has been causally linked in the lay and medical literature to false-positive urine drug screens for cocaine metabolites. An exhaustive search of the peer-reviewed medical literature revealed no data to support this link. We hypothesized that amoxicillin does not cause false-positive urine drug screens for cocaine metabolites.

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Objective: To evaluate the DanceSafe Complete Adulterant Screening Kit for Ecstasy with regard to its accuracy in identifying 3,4-methylenedioxymeth-amphetamine (MDMA) and methylenedioxyamphetamine (MDA) derivatives and its ability to detect certain contaminants.

Methods: In part 1, 39 street-grade tablets purported to be MDMA were tested with the Marquis, Mecke, and Simon's reagents provided by the DanceSafe testing kit. The tablets then were submitted to gas chromatography-mass spectrometry for identification of active ingredients.

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