Sammendrag/informasjon

Target and Non-target Techniques for the Quantitation of Drugs of Abuse, Identification of Transformation Products, and Characterization of Contaminants of Emergent Concern by High Resolution Mass Spectrometry

Heuett, Nubia Vanesa.   Florida International University ProQuest Dissertations Publishing,  2015. 10002866.

Abstrakt (sammendrag)

Development and application of target and non-target techniques for routine analysis, identification of transformation products, and characterization of unknown compounds in water matrices using liquid-chromatography high-resolution mass spectrometry (HRMS) were explored in this dissertation. A novel analytical method based on online-SPE-LC-HRMS was developed for the detection of 18 drugs of abuse (DOAs) in raw sewage water from a college campus. Results showed the presence of 14 DOAs for which amphetamine and 11-nor-9-carcoxy-THC (THC metabolite) were the most prevalent and had the highest potential consumption rates.

A second study dedicated to the identification of transformation products (TPs) generated from DOAs was conducted using a combination of HR-MS/MS and metabolic identification and structural elucidation software. Findings confirmed the presence of multiple phase I and II DOA TPs (n=35) in raw sewage influents. Concentrations of all TPs were estimated based on the parent DOAs response factors, and used to calculate the percent mole fraction contributions of each TP to the parent concentrations. High abundance and frequency (compared to the parent drug) was determined for 9 of the TPs coming from drugs like oxycodone, morphine, codeine, methadone, LSD, cocaine, and MDEA.

Non-target analysis using HRMS was explored as a tool to characterize, and compare a series of interconnected water matrices along a river system. Several thousands of formulae were generated using automated heuristic rules from the full-scan acquisition at 140,000 resolution. Samples were part of a trajectory covering upstream, effluent, effluent mixing zone, downstream, drinking water intake, and treated drinking water locations. Graphical representations of the data were used to evaluate commonalities among the system. Using this approach, a total of 64 recalcitrant components were identified throughout the samples downstream of the effluent release point. Using a combination of MS/MS and computer-aid software techniques 4 out of the 64 compounds were tentatively confirmed. In addition, comparison of drinking water intake and finalized treated drinking water sites showed the presence of 1,152 chemical entities that were common to both locations; and 1,857 that were unique to the treated drinking water. Therefore, this non-target technique could be used to identify the potential formation of treatment byproducts.

Indeksering (informasjon)


Emne
Analytical chemistry
Klassifisering
0486: Analytical chemistry
Identifikator/nøkkelord
Pure sciences; Drugs of abuse; Mass spectrometry; Surface water characterization; Transformation products
Tittel
Target and Non-target Techniques for the Quantitation of Drugs of Abuse, Identification of Transformation Products, and Characterization of Contaminants of Emergent Concern by High Resolution Mass Spectrometry
Forfatter
Heuett, Nubia Vanesa
Antall sider
185
Gradsdato
2015
Skolens kode
1023
Kilde
DAI-B 77/06(E), Dissertation Abstracts International
Utgivelsessted
Ann Arbor
Utgivelsesland
United States
ISBN
978-1-339-42229-9
Rådgiver
Gardinali, Piero R.
Komitemédlem
Almirall, Jose; DeCaprio, Anthony; Landrum, John; Tansel, Berrin
Universitet/institusjon
Florida International University
Avdeling
Chemistry
Universitetssted
United States -- Florida
Grad
Ph.D.
Kildetype
Avhandling eller doktorgradsavhandling
Språk
Engelsk
Dokumenttype
Dissertation/Thesis
Avhandlingsnummer
10002866
ProQuest-dokument-ID
1761184911
Opphavsrett
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
https://www.proquest.com/unauthdocview/1761184911