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Phosphate buffer pH 7.6¡ª Dissolve 0.725 g of monobasic sodium phosphate and 4.472 g of anhydrous dibasic sodium phosphate in 300 mL of water, dilute with water to 1000 mL, and mix. Dilute 250 mL of this solution with water to 1000 mL. If necessary, adjust with phosphoric acid to a pH of 7.6.
Mobile phase¡ª Prepare a filtered and degassed mixture of Phosphate buffer pH 7.6 and acetonitrile (72.5:27.5). Make adjustments if necessary (see System Suitability under Chromatography 621). [NOTE¡ªTo improve the resolution, the composition may be changed to 75:25, if necessary.]
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