EN) Mohamed Abdel-Rehim, New trend in sample preparation: on-line microextraction in packed syringe for liquid and gas ... and solid phase microextraction techniques combined with gas chromatography-mass spectrometry analysis for a rapid screening of ... Determination of remifentanil in human plasma by liquid chromatography-tandem mass spectrometry utilizing micro extraction in ... EN) Mohammad Mahdi Moein, Abbi Abdel-Rehim e Mohamed Abdel-Rehim, Microextraction by packed sorbent (MEPS), in TrAC Trends in ...