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Featured researches published by Chris W. Chronister.


Pharmacotherapy | 2003

Putting an Ecstasy Test Kit to the Test: Harm Reduction or Harm Induction?

Rebecca A. Murray; Paul L. Doering; Lisa A. Boothby; Michele L. Merves; Rachel R. McCusker; Chris W. Chronister; Bruce A. Goldberger

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.


Journal of Analytical Toxicology | 2015

Ethylone-Related Deaths: Toxicological Findings

Dayong Lee; Chris W. Chronister; Jennifer Hoyer; Bruce A. Goldberger

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. This report presents nine postmortem cases in whom ethylone was identified. Ethylone was isolated using solid-phase extraction and detected by gas chromatography-mass spectrometry. Seven of the cases had measurable concentrations of ethylone in blood, ranging from 38 to 2,572 ng/mL; ethylone was detected in the blood sample of one case with a concentration below the assay limit of quantification (25 ng/mL), and one case did not have detectable ethylone in blood. Besides ethylone, all but one case were also positive for 11-nor-9-carboxy-Δ9-tetrahydrocannabinol; seven cases had other drugs quantified in blood, including ethanol, alprazolam, benzoylecgonine, diphenhydramine, morphine and tramadol. In five cases where ethylone was present at blood concentrations >400 ng/mL, no other drugs excluding ethanol, cannabis metabolite and doxylamine (one case) were found. The assay also tested for mephedrone, methylone and three dimethoxyamphetamine analogs; no case was positive for these analytes. The present report documents postmortem blood concentrations of ethylone, a novel synthetic cathinone, along with other concurrently identified substances. The findings provide valuable information for developing analytical assays and evaluating a toxic concentration range of ethylone.


Clinical Chemistry | 2009

Unexpected Urine Drug Testing Results in a Hospice Patient on High-Dose Morphine Therapy

Gary M. Reisfield; Chris W. Chronister; Bruce A. Goldberger; Roger L. Bertholf

A 41-year-old African-American woman was admitted to an inpatient hospice facility with advanced, inoperable cervical cancer. The patient was experiencing severe pain secondary to extensive local tumor invasion, osseous pelvic metastases, and sacral decubitus ulcers. Her pain was treated with an escalating-dose schedule of morphine sulfate until satisfactory analgesia was achieved with stable doses of a combination of controlled-release morphine sulfate (MSContin®, Purdue Pharma LP) 400 mg orally every 8 h, and immediate-release morphine sulfate (MSIR®, Purdue Pharma LP), 180 mg orally every 4 h, as needed for breakthrough pain (average 2 to 3 doses per day). The patient experienced several episodes of life-threatening vaginal bleeding for which she was hospitalized for red blood cell transfusions and bilateral hypogastric artery embolizations. She spent the final 12 weeks of her life exclusively on the inpatient hospice unit. Approximately 3 weeks before her death, the patient underwent urine specimen collection and analysis of morphine and metabolites. GC-MS analysis revealed the presence of morphine as well as small quantities of hydromorphone. During the past 2 decades, chronic opioid analgesic therapy (COAT) for chronic nonmalignant pain has gained increasing clinical acceptance. An unintended consequence of more liberal opioid prescription practices has been a dramatic increase in the abuse and diversion of these drugs. According the most recent National Survey on Drug Abuse and Health (1), the number of new, past-year abusers of prescription opioids was 2 147 000—more than the number of new abusers of any other single class …


Methods of Molecular Biology | 2010

Quantitation of Opioids in Blood and Urine Using Gas Chromatography-Mass Spectrometry (GC-MS)

Bruce A. Goldberger; Chris W. Chronister; Michele L. Merves

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. The morphine, codeine, hydromorphone, hydrocodone, and 6-acetylmorphine extracts are derivatized with N-methyl-bis(trifluoroacetamide) (MBTFA) producing trifluoroacetyl derivatives. The final extracts are then analyzed using selected ion monitoring GC-MS.


Methods of Molecular Biology | 2010

Quantitation of fentanyl in blood and urine using gas chromatography-mass spectrometry (GC-MS).

Bruce A. Goldberger; Chris W. Chronister; Michele L. Merves

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. The final extracts are reconstituted in methanol and analyzed using selected ion monitoring gas chromatography-mass spectrometry.


Methods of Molecular Biology | 2010

Quantitation of Benzodiazepines in Blood and Urine Using Gas Chromatography-Mass Spectrometry (GC-MS)

Bruce A. Goldberger; Chris W. Chronister; Michele L. Merves

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. 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. The benzodiazepine extracts are derivatized with N-methyl-N-(tert-butyldimethylsilyl)trifluoroacetamide (MTBSFTA) producing tert-butyldimethyl silyl derivatives; the alprazolam extracts are reconstituted in methanol without derivatization. The final extracts are then analyzed using selected ion monitoring GC-MS.


Methods of Molecular Biology | 2010

Quantitation of Oxycodone in Blood and Urine Using Gas Chromatography-Mass Spectrometry (GC-MS)

Bruce A. Goldberger; Chris W. Chronister; Michele L. Merves

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. Specimens are extracted using mixed-mode solid phase extraction and derivatized with N,O-bis(trimethylsilyl)trifluoroacetamide (BSTFA) producing trimethylsilyl derivatives. The final extracts are then analyzed using selected ion monitoring GC-MS.


The American Journal of Medicine | 2012

Psychoactive "Bath Salts" Intoxication with Methylenedioxypyrovalerone

Edward A. Ross; Gary M. Reisfield; Mary Watson; Chris W. Chronister; Bruce A. Goldberger


Journal of Analytical Toxicology | 1999

Analysis of Gamma-Hydroxybutyrate (GHB) in Urine by Gas Chromatography-Mass Spectrometry

Rachel R. McCusker; Helen Paget-Wilkes; Chris W. Chronister; Bruce A. Goldberger; Mahmoud A. ElSohly


Journal of Analytical Toxicology | 2001

Rapid detection of benzoylecgonine in vitreous humor by enzyme immunoassay

Chris W. Chronister; Jessica C. Walrath; Bruce A. Goldberger

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Roger L. Bertholf

University of Florida Health Science Center

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George R. Wilson

University of Florida Health Science Center

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