Separation,determination of six impurities in methotrexate drug substance using ultra-performance liquid chromatography |
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Authors: | Cai-Sheng Wu Cai-Hong Wang Jin-Lan Zhang Dong-Mei Wang Yuan-Feng Tong Song Wu Hai-Wei Huang Bao-Ming Ning |
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Institution: | a State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China;
b Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China;
c National Institutes for Food and Drug Control, Beijing 100050, China |
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Abstract: | Methotrexate(MTX) is an antineoplastic therapeutic medicine as antimetabolite of folic acid. In this paper, a sensitive and rapid ultra-performance liquid chromatographic(UPLC) method was developed and validated for the separation and determination of impurities in MTX drug substances. The UPLC method was accomplished on an Agilent Zorbax Extend C-18(50 mm 4.6 mm, 1.8 mm) with a gradient elution system composed of sodium dihydrogen phosphate in water(20 mmol/L, pH 3.0) and acetonitrile. The flow rate was 2.2 mL/min. The method was validated. The calibration curves displayed good linearity(r 0.999) within the tested concentration ranges. The limit of detection(LOD) and limit of quantification(LOQ) of the six analytes were all less than 0.774 mg/mL and 1.03 mg/mL. The relative standard deviation(RSD) for intra- and inter-day precision of the six analytes was less than 9.8%, including at the LOQ. The average recovery ranged from 95.2% to 103% except at the LOQ, where recovery ranged from 82.7% to 117%. The validated method was successfully used to determine the relative abundance of six impurities in the MTX drug substances. |
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Keywords: | MethotrexateUltra-performanceLiquid chromatographyImpurity |
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