Identification of testosterone and testosterone esters in human hair.

In 1974, steroids were added to the list of doping agents banned by the International Olympic Committee because of their effects on the performance of the athletes. Testosterone and its esters promote the development of secondary male sexual characteristics and accelerate muscle growth. The mandatory test to detect testosterone abuse is to measure the ratio of testosterone to epitestosterone in the urine. However, because athletes can adjust their dosage to stay within the range permitted, there is a risk of test evasion. Therefore, we developed two original procedures to determine testosterone and its esters in human hair. First, testosterone was investigated in hair obtained from 26 control subjects. After decontamination with dichloromethane, 100 mg of hair was incubated in 1 M NaOH in the presence of 1 ng of testosterone-d3. After neutralization, the extract was purified using solid-phase extraction with Isolute C18 columns followed by liquid-liquid extraction with pentane. After silylation, testosterone was analyzed by gas chromatography-mass spectrometry. Concentrations were in the range 1.2 to 11.4 pg/mg with a mean value of 3.8 pg/mg. To distinguish exogenous abuse from endogenous levels, the incorporation of testosterone esters into hair was investigated. Preparation involved methanolic incubation to avoid the cleavage of the esters. In a panel of eight esters, it was possible to identify testosterone propionate, testosterone enanthate, and testosterone decanoate in the hair of two bodybuilders and one weight lifter. This new technology may find useful applications in anabolic abuse control.