Macitentan (MAC) is a pulmonary arterial hypertension (PAH) drug marketed as a tablet and often has stability issues in the final dosage form. Quantitative determination of MAC and its associated impurities in tablet ...Macitentan (MAC) is a pulmonary arterial hypertension (PAH) drug marketed as a tablet and often has stability issues in the final dosage form. Quantitative determination of MAC and its associated impurities in tablet dosage form has not been previously reported. This study quantified impurities present in Macitentan tablets using a binary solvent-based gradient elution method using reversed phase-high performance liquid chromatography.The developed method w as validated per International Conference on Harmonization (ICH) guidelines and the drug product w as subjected to forced degradation studies to evaluate stability. The developed method efficiently separated the drug and impurities (48 min) w ithout interference from solvents,excipients,or other impurities. The developed method met all guidelines in all characteristics w ith recoveries ranging from 85%-115%,linearity w ith r 2≥0. 996 6,and substantial robustness. The stability-indicating nature of the method w as evaluated using stressed conditions (hydrolysis:1 N HCl at 80℃/15 min; 1 N NaOH at 25℃/45 min; humidity stress (90%relative humidity) at 25℃for 24 h,oxidation:at 6%(v/v) H2O2,80℃/15 min,thermolysis:at105℃/16 h and photolysis:UV light at 200 Wh/m2; Fluorescent light at 1. 2 million luxh). Forced degradation experiments show ed that the developed method w as effective for impurity profiling. All stressed samples w ere assayed and mass balance w as> 96%. Forced degradation results indicated that MAC tablets w ere sensitive to hydrolysis (acid and alkali) and thermal conditions. The developed method is suitable for both assay and impurity determination,w hich is applicable to the pharmaceutical industry.展开更多
文摘目的在正相色谱条件下建立了托吡卡胺、氢溴酸后马托品、硫酸阿托品和山莨菪碱共4种阿托品类药物的对映体分离方法。方法使用Chiralpak IC[纤维素-三(3,5-二氯苯基氨基甲酸酯)共价键合硅胶]手性色谱柱,考察了不同流动相体系、烷醇体积比、酸碱添加剂、柱温以及流速对对映体分离的影响。结果 4种药物均可达到良好的分离度,通过不断优化色谱分离条件最终确定分离4种药物的最佳流动相条件:柱温为25℃,流速为1.0 m L·min-1,分离托吡卡胺对映体的流动相为正己烷-乙醇-二乙胺(体积比70∶30∶0.05),分离氢溴酸后马托品和硫酸阿托品对映体的流动相为正己烷-乙醇-二乙胺(体积比80∶20∶0.05),在最佳条件下3种药物对映体之间的分离度分别为7.73、2.36和2.67。分离山莨菪碱4个对映体的最佳流动相为正己烷-异丙醇-乙酸-二乙胺(体积比70∶30∶0.05∶0.025)。结论纤维素键合手性固定相对除山莨菪碱以外的3种抗胆碱能药物均能达到完全分离。
基金the management of Sinotherapeutics Inc. for supporting this study
文摘Macitentan (MAC) is a pulmonary arterial hypertension (PAH) drug marketed as a tablet and often has stability issues in the final dosage form. Quantitative determination of MAC and its associated impurities in tablet dosage form has not been previously reported. This study quantified impurities present in Macitentan tablets using a binary solvent-based gradient elution method using reversed phase-high performance liquid chromatography.The developed method w as validated per International Conference on Harmonization (ICH) guidelines and the drug product w as subjected to forced degradation studies to evaluate stability. The developed method efficiently separated the drug and impurities (48 min) w ithout interference from solvents,excipients,or other impurities. The developed method met all guidelines in all characteristics w ith recoveries ranging from 85%-115%,linearity w ith r 2≥0. 996 6,and substantial robustness. The stability-indicating nature of the method w as evaluated using stressed conditions (hydrolysis:1 N HCl at 80℃/15 min; 1 N NaOH at 25℃/45 min; humidity stress (90%relative humidity) at 25℃for 24 h,oxidation:at 6%(v/v) H2O2,80℃/15 min,thermolysis:at105℃/16 h and photolysis:UV light at 200 Wh/m2; Fluorescent light at 1. 2 million luxh). Forced degradation experiments show ed that the developed method w as effective for impurity profiling. All stressed samples w ere assayed and mass balance w as> 96%. Forced degradation results indicated that MAC tablets w ere sensitive to hydrolysis (acid and alkali) and thermal conditions. The developed method is suitable for both assay and impurity determination,w hich is applicable to the pharmaceutical industry.
