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3 protocols using esomeprazole magnesium hydrate

1

Simultaneous Quantification of Esomeprazole, Rabeprazole, and Levosulpiride

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Reference standards of esomeprazole magnesium hydrate, rabeprazole sodium, levosulpiride and lansoprazole (internal standard, IS) were purchased from Sigma-Aldrich (Hyderabad, India). HPLC grade ammonium formate was procured from Thermo Fisher Scientific (Mumbai, India). HPLC grade methanol and acetonitrile were procured from J.T Baker (Phillipsburg, USA). Milli-Q water (18.2 mΩ and TOC≤50 ppb) generated using a Milli-Q purification system (Millipore, Bangalore, India) was used throughout the study. Methyl tert-butyl ether and ethyl acetate were purchased from Rankem (Hyderabad, India). Drug-free human plasma was procured from King George Hospital (Visakhapatnam, India).
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2

Cytotoxicity Evaluation of Pharmaceuticals

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Esomeprazole magnesium hydrate, omeprazole, N-acetylcysteine (NAC), thapsigargin (TG), RPMI-1640, MCDB-153 medium, and antibiotics were from Sigma-Aldrich (Madrid, Spain). Fetal bovine serum (FBS) and Hank's balanced salt solution (HBSS) were both from Life Technologies (Madrid, Spain). All compounds except pepstatin A, which was dissolved in 100% ethanol and NAC, which was dissolved in culture media, were dissolved in DMSO and made up with the media so that the final concentration of the vehicle was not >0.04% (v/v).
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3

Chiral LC-MS Analysis of Proton Pump Inhibitors

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Macrocyclic glycopeptides-type chiral columns with identical dimensions (100 × 4.6 mm, 5-μm particle size)ristocetin A-based Chirobiotic R, teicoplanin-based Chirobiotic T, teicoplanin aglycone-based Chirobiotic TAG, and vancomycin-based Chirobiotic V were purchased from Supelco/Astec, (Milwaukee, Wisconsin). Pantoprazole sodium hydrate (≥98%), esomeprazole magnesium hydrate (≥98%), and triethylamine (≥99%) were ordered from Sigma-Aldrich Hungary (Budapest). Gradient grade methanol (MeOH), acetonitrile (ACN), ethanol (EtOH), glacial acetic acid, ammonium acetate (≥98%), ammonium formate (≥99%), and formic acid (≥98%) were purchased from Merck (Darmstadt, Germany). Controloc 20-mg tablets were obtained from Central Pharmacy of Semmelweis University (Budapest, Hungary). Ultrapure, deionized water was prepared by a Milli-Q Direct 8 Millipore system (Milford, Massachusetts).
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