Analysis and enantioresolution of donepezil by capillary electrophoresis.
The analysis of donepezil, a centrally acting acetylcholine esterase inhibitor, is described by a CZE method suitable for applications in pharmaceutical field. A rapid migration of the analyte was obtained under acidic conditions (pH 3.0); with detection wavelength of 320 nm a LOD of 0.8 x 10(-3) mg/ml was provided. Applications on real sample (pharmaceuticals) were carried out using two different instruments with comparable results in terms of reproducibility and accuracy. The use of chiral selectors in the running buffer allowed the enantioseparation of donepezil; charged cyclodextrins (carboxymethyl-beta-cyclodextrin and sulfated-beta-cyclodextrin) were suitable for the chiral resolution of the analyte. Interesting results were also obtained using human serum albumin. The protein-based CE enantioseparation was carried out at pH 7.4 avoiding the partial filling technique due to the good absorptivity of donepezil at 320 nm. Interestingly, the use of bicine as BGE provided a significative improvement in the enantioresolution compared to that obtained by phosphate buffer.
Gotti
R
R
Dipartimento di Scienze Farmaceutiche, Università degli Studi di Bologna, Via Belmeloro 6, 40126 Bologna, Italy. gottir@alma.unibo.it
Cavrini
V
V
Pomponio
R
R
Andrisano
V
V
D002800:Cholinesterase Inhibitors / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification; D000077265:Donepezil; D019075:Electrophoresis, Capillary / Q000379:methods*; D007189:Indans / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification; D010880:Piperidines / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013237:Stereoisomerism
D002800:Cholinesterase Inhibitors; D007189:Indans; D010880:Piperidines; D000077265:Donepezil