A scheme for the detection of synthetic steroids which could be used in the "doping" of race-horses is described. The method involves extraction from urine into ethyl acetate : ether (1 : 1) followed by initial two-dimensional thin-layer chromatography using (1) ethyl acetate (2) methylene chloride : dioxan :water (100: 50 : 50). Elution of the ultraviolet absorbing spots for extinction measurements is followed by further one way thin-layer chromatography as free alcohols in amyl acetate : acetone (1 : 1). Further chromatography of the steroid alcohols in chloroform : ether : water (80 : 20 : 0.5) on formamide-impregnated plates and chromatography of the acetates in ether helps to identify the unknown steroid. Additional identification is made by colour reactions with (1) a tetrazolium reagent (2) vanillin : perchloric acid.
NTI-INFLAMMATORY steroids are now widely used both inA veterinary and human medicine. Their possible use to influence the performance of racehorses caused us to investigate methods for their detection. We report a method for the detection of the steroids most likely to be used in this way. The method enables a separation to be made between any of these synthetic steroids and the naturally occurring steroids in horse urine. For the purpose of identifying the presence of "dope", we developed a method which would detect unchanged drug because (i) this was easier than looking for conjugated forms of drug which would need to be hydrolysed ; (ii) it made the diagnosis of "doping" more certain in cases where metabolites might be the same as those from endogenous steroids, e.g. metabolites from prednisolone and hydrocortisone ; (iii) detailed metabolism studies were not necessary (although work on this aspect has already commenced). For speed, we considered a method based on thin-layer chromatography would be preferable to any based on paper chromatography. From our attempts to obtain samples, we found that the only accessible anti-inflammatory steroids were : betamethasone, dexamethasone, fludrocortisone, 6a-methylhydrocortisone, 6a-methylprednisolone, prednisolone, prednisone and triamcinolone. These were used as the alcohols since their 21-esters would be hydrolysed to the parent alcohols in the body (Voigt, 1959;Melby & St. Cyr, 1961). These steroids, and hydrocortisone and cortisone, and their separation, form the subject of this paper.
Experiment a1
MATERIALS