Abstract
In this thesis, we develop a method of using headspace solid-phase microextraction (HS-SPME) combined with gas chromatograph-ion trap mass spectrometer (GC-ITMS) to detect a β-agonist : clenbuterol.We discuss and optimize eight parameters of extraction and desertion procedure, including types of fibers, extraction temperature, extraction time, desorption temperature, desorption time, stir rate, ionic strength, pH of sample and cooling system.The method show good linearity over the concentration range 1–1000 ng/mL and gives detection limits below ng/mL level. Precision is also good (3.89%). Finally, the method is successfully applied to analyze clenbuterol in urine.