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Acetonitrile (HPLC grade), orthophosphoric acid [analytical reagent (AR) grade], sodium hydroxide (AR grade), and ammonium acetate (AR grade) were purchased from E. Merck (India) Ltd. Worli, Mumbai, India. All active pharmaceutical ingredients (APIs) RP, PP, and IP as reference standards were obtained from Medley Pharmaceuticals Limited, Mumbai, India (99.7–99.9% purity).
Copyright and License information: ©2014 Taiwan Food and Drug Administration
This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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