Screening of amphetamines by gradient microbore liquid chromatography and pre-column technology.

The study explores the use of a gradient microbore liquid chromatography method for on-line pre-concentration and screening of amphetamine-type drugs in human and horse urine. The research suggests that this technique may be useful for automated detection processes of these substances, such as in doping control.

Research Objective

• This study aimed to devise an efficient method for the detection of amphetamine-type drugs in urinary samples. The authors specifically focused on developing a way to screen these substances in a broad polarity range present in both human and horse urine.

Methodology

• The researchers utilized two techniques: on-line pre-concentration on pre-columns and gradient microbore high-performance liquid chromatography.
• The pre-columns were packed with substances known as hydrophobic and cation-exchange sorbents, which effectively concentrated the amphetamines in the urine samples before screening.

Process of Identification

• Using the aforementioned techniques, the researchers managed to identify the amphetamines without having to modify them chemically (underivatization).
• The identification was carried out by ultraviolet (UV) detection at 210 nm, a wavelength that allows the identification of amphetamines specifically.

Potential Applications

• These findings indicate that the developed method could be useful for the automated liquid chromatographic screening of amphetamines in urine. This has significant implications for doping control as it offers a fast and reliable way to detect these substances in both human and animal samples.
• Given that the screening does not require the prior chemical modification of the samples, and with its potential for automation, this procedure can be seen as highly feasible and practical in real-world applications.