adsorbents were purchased from Agilent Technologies ® (West Lothan, UK). Stock and working solutions were prepared in acetonitrile (ACN) HPLC grade purchased from Merck (Darmstadt, Germany) and stored at −20˚C.
adsorbents were purchased from Agilent Technologies® (West Lothan, UK). Stock and working solutions were prepared in acetonitrile (ACN) HPLC gradepurchased from Merck (Darmstadt, Germany) and stored at −20˚C.