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  1. Article ; Online: Testing the test strips: laboratory performance of fentanyl test strips.

    Halifax, John C / Lim, Lilly / Ciccarone, Daniel / Lynch, Kara L

    Harm reduction journal

    2024  Volume 21, Issue 1, Page(s) 14

    Abstract: Background: The overdose crisis driven by synthetic opioids continues to escalate in the USA. We evaluated the efficacy of multiple manufacturing lots of a fentanyl test strip (FTS) to detect fentanyl and fentanyl analogs and assessed cross-reactivity ... ...

    Abstract Background: The overdose crisis driven by synthetic opioids continues to escalate in the USA. We evaluated the efficacy of multiple manufacturing lots of a fentanyl test strip (FTS) to detect fentanyl and fentanyl analogs and assessed cross-reactivity with possible interferences.
    Methods: Drug standards were dissolved in water in a laboratory setting and serially diluted. Drug dilutions were tested using five different manufacturing lots of BTNX Rapid Response (20 ng/mL cutoff) lateral flow chromatographic immunoassay strips to assess lot-to-lot variability for FTS sensitivity and cross-reactivity for the analytes of interest.
    Results: All five manufacturing lots cross-reacted with fentanyl and eleven fentanyl analogs. Diphenhydramine, lidocaine, MDMA, and methamphetamine were found to cause false positives with the strips. There was notable lot-to-lot variability in the sensitivity of the strips for fentanyl, fentanyl analogs, and known interferences.
    Discussion: FTS remains an important overdose prevention tool, but lot-to-lot variability in performance complicates robust instructions that balance the prevention of false positives and false negatives. Continued lot-to-lot performance assessment is recommended to ensure health education for FTS remains accurate. More sophisticated drug checking technologies and services are needed in the community landscape to augment personal FTS use to facilitate informed consumption and overdose risk mitigation.
    MeSH term(s) Humans ; Fentanyl/analysis ; Analgesics, Opioid/analysis ; Drug Overdose/prevention & control
    Chemical Substances Fentanyl (UF599785JZ) ; Analgesics, Opioid
    Language English
    Publishing date 2024-01-18
    Publishing country England
    Document type Journal Article
    ZDB-ID 2146691-9
    ISSN 1477-7517 ; 1477-7517
    ISSN (online) 1477-7517
    ISSN 1477-7517
    DOI 10.1186/s12954-023-00921-8
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: The Effect of Route of Administration and Vehicle on the Pharmacokinetics of THC and CBD in Adult, Neonate, and Breastfed Sprague-Dawley Rats.

    Soni, Isha / Chinn, Gregory A / Halifax, John C / Hellman, Judith / Lynch, Kara L / Sall, Jeffrey W

    Cannabis and cannabinoid research

    2023  

    Abstract: Introduction: ...

    Abstract Introduction:
    Language English
    Publishing date 2023-10-18
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2867624-5
    ISSN 2378-8763 ; 2578-5125
    ISSN (online) 2378-8763
    ISSN 2578-5125
    DOI 10.1089/can.2023.0121
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Development and application of a High-Resolution mass spectrometry method for the detection of fentanyl analogs in urine and serum.

    Zhang, Yu / Halifax, John C / Tangsombatvisit, Christina / Yun, Cassandra / Pang, Shaokun / Hooshfar, Shirin / Wu, Alan H B / Lynch, Kara L

    Journal of mass spectrometry and advances in the clinical lab

    2022  Volume 26, Page(s) 1–6

    Abstract: Introduction: The use of illicitly manufactured synthetic opioids, specifically fentanyl and its analogs, has escalated exponentially in the United States over the last decade. Due to the targeted nature of drug detection methods in clinical ... ...

    Abstract Introduction: The use of illicitly manufactured synthetic opioids, specifically fentanyl and its analogs, has escalated exponentially in the United States over the last decade. Due to the targeted nature of drug detection methods in clinical laboratories and the ever-evolving list of synthetic opioids of concern, alternative analytical approaches are needed.
    Methods: Using the fentanyl analog screening (FAS) kit produced by the Centers for Disease Control and Prevention (CDC), we developed a liquid chromatography-high resolution mass spectrometry (LC-HRMS) synthetic opioid spectral library and data acquisition method using information dependent acquisition of product ion spectra. Chromatographic retention times, limits of detection and matrix effects, in urine and serum, for the synthetic opioids in the FAS kit (n = 150) were established. All urine and serum specimens sent to a clinical toxicology laboratory for comprehensive drug testing in 2019 (n = 856) and 2021 (n = 878) were analyzed with the FAS LC-HRMS library to determine the prevalence of fentanyl analogs and other synthetic opioids, retrospectively (2019) and prospectively (2021).
    Results: The limit of detection (LOD) of each opioid ranged from 1 to 10 ng/mL (median, 2.5 ng/mL) in urine and 0.25-2.5 ng/mL (median, 0.5 ng/mL) in serum. Matrix effects ranged from -79 % to 86 % (median, -37 %) for urine, following dilution and direct analysis, and -80 % to 400 % (median, 0 %) for serum, following protein precipitation. The prevalence of fentanyl/fentanyl analogs in serum samples increased slightly from 2019 to 2021 while it remained the same in urine. There were only 2 samples identified that contained a fentanyl analog without the co-occurrence of fentanyl or fentanyl metabolites. Analysis of the established MS/MS spectral library revealed characteristic fragmentation patterns in most fentanyl analogs, which can be used for structure elucidation and drug identification of future analogs.
    Conclusions: The LC-HRMS method was capable of detecting fentanyl analogs in routine samples sent for comprehensive drug testing. The method can be adapted to accommodate testing needs for the evolving opioid epidemic.
    Language English
    Publishing date 2022-07-22
    Publishing country Netherlands
    Document type Journal Article
    ISSN 2667-145X
    ISSN (online) 2667-145X
    DOI 10.1016/j.jmsacl.2022.07.005
    Database MEDical Literature Analysis and Retrieval System OnLINE

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