The bench top and refrigerator stability of donepezil hydrochloride final stock solution, that is, the mobile phase of the chromatographic method developed, composed of acidified water with acetic acid 0.20% and acetonitrile (70:30 v/v) was evaluated.The stock solution was initially prepared, then, 1 mL was aliquoted and transferred to vials (n = 3) according to the type of stability evaluated, as follows:• Benchtop stability: the effects of ambient temperature isolated and associated with ambient light were evaluated using amber vials and transparent vials, respectively, during the 10-hour period at an average temperature of 22.14 ± 1.48°C. * MP: Mobile phase; ** D: Diluent.
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