“…Drug determinations have been accomplished in plasma [117,138,141,142], urine [60,68,81], serum [79,117,[143][144][145], cerebral spinal fluid [141], and cell lines [125]. Impurity (and purity) analysis of drugs [18,59], preparations [146], and tablets [102,[147][148][149] have also been demonstrated with MEKC. Other reports have demonstrated means of determining metabolites [60,68,81,117,125], degradation products [92] and constituent analysis [65,94,150,151].…”