采用HILIC色谱柱,利用高效液相色谱分离L-抗坏血酸和D-异抗坏血酸,考察了流动相的组成、柱温和流速对分离L-抗坏血酸和D-异抗坏血酸的影响.结果表明:流动相为乙腈-0.1%磷酸(93∶7),流速为0.8 m L·min^(-1),柱温为20℃,检测波长为24...采用HILIC色谱柱,利用高效液相色谱分离L-抗坏血酸和D-异抗坏血酸,考察了流动相的组成、柱温和流速对分离L-抗坏血酸和D-异抗坏血酸的影响.结果表明:流动相为乙腈-0.1%磷酸(93∶7),流速为0.8 m L·min^(-1),柱温为20℃,检测波长为243 nm的条件下,分离效果最优,分离度为7.79.该方法进一步应用于3种维生素C实际样品中抗坏血酸含量的测定,3种样品中均仅有L-抗坏血酸检出,其含量在96.62~985.8 mg·g^(-1)之间,相对标准偏差在0.65%~0.94%之间.展开更多
Aryloxypropanolamine is an essential structural scaffold for a variety of b-adrenergic receptor antagonists such as metoprolol.Molecules with such a structural motif tend to degrade into α,β ehydroxypropanolamine im...Aryloxypropanolamine is an essential structural scaffold for a variety of b-adrenergic receptor antagonists such as metoprolol.Molecules with such a structural motif tend to degrade into α,β ehydroxypropanolamine impurities via a radicaleinitiated oxidation pathway.These impurities are typically polar and nonchromophoric,and are thus often overlooked using traditional reversed phase chromatography and UV detection.In this work,stress testing of metoprolol confirmed the generation of 3-isopropylamino-1,2-propanediol as a degradation product,which is a specified impurity of metoprolol in the European Pharmacopoeia(impurity N).To ensure the safety and quality of metoprolol drug products,hydrophilic interaction chromatography(HILIC)methods using Halo Penta HILIC column(150mm×4.6 mm,5 μm)coupled with charged aerosol detection(CAD)were developed and optimized for the separation and quantitation of metoprolol impurity N in metoprolol drug products including metoprolol tartrate injection,metoprolol tartrate tablets,and metoprolol succinate extended-release tablets.These HILIC-CAD methods were validated per USP validation guidelines with respect to specificity,linearity,accuracy,and precision,and have been successfully applied to determine impurity N in metoprolol drug products.展开更多
文摘采用HILIC色谱柱,利用高效液相色谱分离L-抗坏血酸和D-异抗坏血酸,考察了流动相的组成、柱温和流速对分离L-抗坏血酸和D-异抗坏血酸的影响.结果表明:流动相为乙腈-0.1%磷酸(93∶7),流速为0.8 m L·min^(-1),柱温为20℃,检测波长为243 nm的条件下,分离效果最优,分离度为7.79.该方法进一步应用于3种维生素C实际样品中抗坏血酸含量的测定,3种样品中均仅有L-抗坏血酸检出,其含量在96.62~985.8 mg·g^(-1)之间,相对标准偏差在0.65%~0.94%之间.
文摘Aryloxypropanolamine is an essential structural scaffold for a variety of b-adrenergic receptor antagonists such as metoprolol.Molecules with such a structural motif tend to degrade into α,β ehydroxypropanolamine impurities via a radicaleinitiated oxidation pathway.These impurities are typically polar and nonchromophoric,and are thus often overlooked using traditional reversed phase chromatography and UV detection.In this work,stress testing of metoprolol confirmed the generation of 3-isopropylamino-1,2-propanediol as a degradation product,which is a specified impurity of metoprolol in the European Pharmacopoeia(impurity N).To ensure the safety and quality of metoprolol drug products,hydrophilic interaction chromatography(HILIC)methods using Halo Penta HILIC column(150mm×4.6 mm,5 μm)coupled with charged aerosol detection(CAD)were developed and optimized for the separation and quantitation of metoprolol impurity N in metoprolol drug products including metoprolol tartrate injection,metoprolol tartrate tablets,and metoprolol succinate extended-release tablets.These HILIC-CAD methods were validated per USP validation guidelines with respect to specificity,linearity,accuracy,and precision,and have been successfully applied to determine impurity N in metoprolol drug products.
