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2019 (Engelska)Ingår i: Molecules, ISSN 1420-3049, E-ISSN 1420-3049, Vol. 24, nr 7, artikel-id 1191Artikel i tidskrift (Refereegranskat) Published
Abstract [en]
In this study, a novel sort of sample preparation sorbent was developed, by preparing thin layer graphene oxide tablets (GO-Tabs) utilizing a mixture of graphene oxide and polyethylene glycol on a polyethylene substrate. The GO-Tabs were used for extraction and concentration of omeprazole (OME) in human saliva samples. The determination of OME was carried out using liquid chromatography-tandem mass spectrometry (LC-MS/MS) under gradient LC conditions and in the positive ion mode (ESI+) with mass transitions of m/z 346.3 -> 198.0 for OME and m/z 369.98 -> 252.0 for the internal standard. Standard calibration for the saliva samples was in the range of 2.0-2000 nmol L-1. Limits of detection and quantification were 0.05 and 2.0 nmol L-1, respectively. Method validation showed good method accuracy and precision; the inter-day precision values ranged from 5.7 to 8.3 (%RSD), and the accuracy of determinations varied from -11.8% to 13.3% (% deviation from nominal values). The extraction recovery was 60%, and GO-Tabs could be re-used for more than ten extractions without deterioration in recovery. In this study, the determination of OME in real human saliva samples using GO-Tab extraction was validated.
Ort, förlag, år, upplaga, sidor
MDPI, 2019
Nyckelord
graphene oxide, omeprazole, liquid chromatography, tandem mass spectrometry, saliva, GO-Tabs
Nationell ämneskategori
Biofysik
Identifikatorer
urn:nbn:se:kth:diva-251343 (URN)10.3390/molecules24071191 (DOI)000464946300002 ()30934659 (PubMedID)2-s2.0-85063759590 (Scopus ID)
Anmärkning
QC 20190521
2019-05-212019-05-212019-05-21Bibliografiskt granskad