Sample Pretreatment for Confirmation of 19 – Norsteroids by GC – C – IRMS in Doping Control

dc.contributor.authorNimsoongnern Sen_US
dc.contributor.authorWeewong Cen_US
dc.contributor.authorLohwithee Sen_US
dc.contributor.authorWiriyakosol Nen_US
dc.contributor.authorWilairat Pen_US
dc.contributor.authorKongpatanakul Sen_US
dc.contributor.otherMahidol University. National Doping Control Centreen_US
dc.date.accessioned2019-06-14T04:46:21Z
dc.date.available2019-06-14T04:46:21Z
dc.date.created2019-06-14
dc.date.issued2018
dc.descriptionRecent Advances in Doping Analysis (25) Proceeding of the Manfred Donike Workshop 35th Cologne Workshop on Dope Analysis. 5th to 10th March 2017, page 136-139.en_US
dc.description.abstractConfirmation of the use of 19-norsteroids requires the identification of the exogenous origin of the main metabolite, 19-norandrosterone (1g-NA), when found in the urine at concentrations between 2.5 ng/ml and 15 ng/ml. An effective pretreatment procedure is necessary prior to the IRMS measurement. Two HPLC clean up steps were employed to isolate the fractions of 19-NA, '19-noretiocholanolone (19-NE) and two endogenous reference compounds (ERCs), pregnandiol (PD) and androsterone (Andro). Validation followed the WADA requirements as specified in TD2017NA and TD2016|RMS. Blank urine, 20-30 mL, spiked with 19-NA and 19- NE at 2.5-15 ng/ml, were used for method validation-regarding intra and inter-assay precision. The accuracy and isotopic fractionation were evaluated using standard 19-NA, 19-NE and certified standard USADA34-1 spiked in steroid stripfed urine. The results show no interference peak close to the target compounds. The difference between the 613C (%d of pure certified standard and spiked steroid stripped urine of less than 0.5 %. verified the accuracy of 613C (%.) measurement and the absence of isotopic fractionation during sample prep.aratipn. This method is fit for the determination of 6l3C (%.) of 19-NA and 19-NE for anti-doping purposes.en_US
dc.identifier.urihttps://repository.li.mahidol.ac.th/handle/20.500.14594/44096
dc.language.isoengen_US
dc.rightsMahidol Universityen_US
dc.rights.holderNational Doping Control Centre Mahidol Universityen_US
dc.subject19-norsteroidsen_US
dc.subjectIRMS measurementen_US
dc.titleSample Pretreatment for Confirmation of 19 – Norsteroids by GC – C – IRMS in Doping Controlen_US
dc.typeProceeding Posteren_US
mods.location.urlhttps://drive.google.com/file/d/1ovTIdedyXG3aa4y0d-Y19c1zB34Bs_Gq/view
mods.location.urlhttps://op.mahidol.ac.th/ra/en/2018/08/06/dc_2561-03/

Files

License bundle

Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description: