were purchased from Dr. Ehrenstorfer Gmbh (Augsburg, Germany). The purities of the standards were all greater than 97%. Acetonitrile (ACN), methanol (MeOH) and formic acid (HPLC/MSgrade) were purchased from ROE Scientific Inc., (Newark, USA).
were purchased from Dr. Ehrenstorfer Gmbh (Augsburg, Germany).The purities of the standards were all greater than 97%. Acetonitrile(ACN), methanol (MeOH) and formic acid (HPLC/MSgrade)were purchased from ROE Scientific Inc., (Newark, USA).