Sample Pretreatment for Confirmation of 19 – Norsteroids by GC – C – IRMS in Doping Control
dc.contributor.author | Nimsoongnern S | en_US |
dc.contributor.author | Weewong C | en_US |
dc.contributor.author | Lohwithee S | en_US |
dc.contributor.author | Wiriyakosol N | en_US |
dc.contributor.author | Wilairat P | en_US |
dc.contributor.author | Kongpatanakul S | en_US |
dc.contributor.other | Mahidol University. National Doping Control Centre | en_US |
dc.date.accessioned | 2019-06-14T04:46:21Z | |
dc.date.available | 2019-06-14T04:46:21Z | |
dc.date.created | 2019-06-14 | |
dc.date.issued | 2018 | |
dc.description | Recent 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.abstract | Confirmation 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.uri | https://repository.li.mahidol.ac.th/handle/20.500.14594/44096 | |
dc.language.iso | eng | en_US |
dc.rights | Mahidol University | en_US |
dc.rights.holder | National Doping Control Centre Mahidol University | en_US |
dc.subject | 19-norsteroids | en_US |
dc.subject | IRMS measurement | en_US |
dc.title | Sample Pretreatment for Confirmation of 19 – Norsteroids by GC – C – IRMS in Doping Control | en_US |
dc.type | Proceeding Poster | en_US |
mods.location.url | https://drive.google.com/file/d/1ovTIdedyXG3aa4y0d-Y19c1zB34Bs_Gq/view | |
mods.location.url | https://op.mahidol.ac.th/ra/en/2018/08/06/dc_2561-03/ |
Files
License bundle
1 - 1 of 1
No Thumbnail Available
- Name:
- license.txt
- Size:
- 1.71 KB
- Format:
- Item-specific license agreed upon to submission
- Description: