Universität zu Köln

Putz, Marlen, Piper, Thomas, Casilli, Alessandro, de Aquino Neto, Francisco Radler, Pigozzo, Fausto and Thevis, Mario (2018). Development and validation of a multidimensional gas chromatography/combustion/isotope ratio mass spectrometry-based test method for analyzing urinary steroids in doping controls. Anal. Chim. Acta, 1030. S. 105 - 115. AMSTERDAM: ELSEVIER SCIENCE BV. ISSN 1873-4324

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Abstract

The misuse of the steroid hormone testosterone for performance enhancement has been frequently reported in the past, and its administration is prohibited in sports according to the regulations of the World Anti-Doping Agency (WADA). Testosterone is produced endogenously in human. Endogenous and exogenous testosterone together with their metabolites can be unambiguously distinguished by means of their carbon isotope ratios if compared to endogenous reference compounds. Established isotope ratio mass spectrometry methods for analyzing urinary steroids for doping control purposes consist of up to two time-consuming HPLC purification steps to achieve the required purity of all analytes. In order to accelerate the sample preparation, multidimensional gas chromatography was applied. This technique is known to be suitable for the separation of complex matrices. Multidimensional gas chromatography consists of two gas chromatographs connected by a pressure-controlled heart-cutting device. In the first dimension, a less polar capillary column was installed for peak purification. In the second dimension, separation was achieved employing a column of medium polarity. Retention time stability and transfer windows were monitored by a flame ionization detector. Detection was performed simultaneously by isotope ratio mass spectrometry and a single quadrupole mass spectrometer for analyte identity confirmation and assessment of peak purity. Instead of two working days required for the HPLC-based routine method, the sample preparation is shortened by the herein presented approach to one working day. For glucuronic acid-conjugated steroids, sample pretreatment is based on solid-phase extraction, liquid-liquid extraction, enzymatic hydrolysis, and derivatization of the target analytes to their corresponding acetates. These steroid acetates are divided according to their polarity into two fractions by solid phase extraction. Further, sulfoconjugated steroids are processed by Pseudomonas aeruginosa arylsulfatase and extracted following a recently established procedure. Following WADA guidelines, the method was validated by determining the parameters linear range, limit of quantification, intra-and interday precision, accuracy and specificity utilizing linear mixing models. Additionally, a reference population (n = 74) was investigated and the obtained data were compared to the established method. An excretion study was also conducted with 4-androstenedione to prove the fit for purpose of the methodology. The results demonstrate that the method is suitable for an application in routine doping control analysis. (C) 2018 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Putz, Marlen UNSPECIFIED UNSPECIFIED UNSPECIFIED Piper, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Casilli, Alessandro UNSPECIFIED UNSPECIFIED UNSPECIFIED de Aquino Neto, Francisco Radler UNSPECIFIED UNSPECIFIED UNSPECIFIED Pigozzo, Fausto UNSPECIFIED UNSPECIFIED UNSPECIFIED Thevis, Mario UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-165928
DOI:	10.1016/j.aca.2018.05.016
Journal or Publication Title:	Anal. Chim. Acta
Volume:	1030
Page Range:	S. 105 - 115
Date:	2018
Publisher:	ELSEVIER SCIENCE BV
Place of Publication:	AMSTERDAM
ISSN:	1873-4324
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language CARBON-ISOTOPE RATIO; REFERENCE-POPULATION; C-13/C-12 RATIOS; CONTROL PURPOSES; CHROMATOGRAPHY; TESTOSTERONE; ONLINE; IRMS; ANDROSTENEDIONE; AUTHENTICATION Multiple languages Chemistry, Analytical Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/16592