For the production of a reference material from caffeine solution, one of the methods of characterization was HPLC-UV since caffeine is very sensitive to the UV. In this work, a batch solution of caffeine in water ref...For the production of a reference material from caffeine solution, one of the methods of characterization was HPLC-UV since caffeine is very sensitive to the UV. In this work, a batch solution of caffeine in water reference material of 1000 mg/kg has been gravimetrically prepared using a calibrated analytical balance. A sample of this solution was diluted to 25 mg/kg for measurement by HPLC-UV in the range 10 - 50 mg/kg. The chromatographic separation was carried out by C-18 column and a mobile phase assembled of 75% water and 25% methanol (v:v). The detection was made by the UV detector at 275 nm. The validation of this analytical method was carried out in accordance with requirements of the EURACHEM and ICH guidelines. The selectivity, linearity, accuracy, precision and trueness (recovery and bias) of the method were studied. The validation results proved that the method is fit-for-purpose of measuring the caffeine concentration in water in the range 10 - 50 mg/kg using HPLC-UV.展开更多
目的建立泽泻的HPLC-UV指纹图谱,为科学评价泽泻的质量提供依据。方法使用Agilent ZORBAX Eclipse Plus C18色谱柱(250mm×4.6mm,5μm);柱温为30℃;流速为1mL·min-1;检测波长为210nm;乙腈-水为流动相进行梯度洗脱。对11批泽泻...目的建立泽泻的HPLC-UV指纹图谱,为科学评价泽泻的质量提供依据。方法使用Agilent ZORBAX Eclipse Plus C18色谱柱(250mm×4.6mm,5μm);柱温为30℃;流速为1mL·min-1;检测波长为210nm;乙腈-水为流动相进行梯度洗脱。对11批泽泻进行指纹图谱相似度研究。结果建立了泽泻的HPLC-UV指纹图谱方法,精密度、重复性和稳定性均良好,指纹图谱指认了环氧泽泻烯和23-乙酰泽泻醇B色谱峰,11批泽泻的指纹图谱相似度均大于0.85。结论该方法简便、可靠、重复性好,可为泽泻的质量控制及评价提供科学依据。展开更多
文摘For the production of a reference material from caffeine solution, one of the methods of characterization was HPLC-UV since caffeine is very sensitive to the UV. In this work, a batch solution of caffeine in water reference material of 1000 mg/kg has been gravimetrically prepared using a calibrated analytical balance. A sample of this solution was diluted to 25 mg/kg for measurement by HPLC-UV in the range 10 - 50 mg/kg. The chromatographic separation was carried out by C-18 column and a mobile phase assembled of 75% water and 25% methanol (v:v). The detection was made by the UV detector at 275 nm. The validation of this analytical method was carried out in accordance with requirements of the EURACHEM and ICH guidelines. The selectivity, linearity, accuracy, precision and trueness (recovery and bias) of the method were studied. The validation results proved that the method is fit-for-purpose of measuring the caffeine concentration in water in the range 10 - 50 mg/kg using HPLC-UV.
文摘目的建立泽泻的HPLC-UV指纹图谱,为科学评价泽泻的质量提供依据。方法使用Agilent ZORBAX Eclipse Plus C18色谱柱(250mm×4.6mm,5μm);柱温为30℃;流速为1mL·min-1;检测波长为210nm;乙腈-水为流动相进行梯度洗脱。对11批泽泻进行指纹图谱相似度研究。结果建立了泽泻的HPLC-UV指纹图谱方法,精密度、重复性和稳定性均良好,指纹图谱指认了环氧泽泻烯和23-乙酰泽泻醇B色谱峰,11批泽泻的指纹图谱相似度均大于0.85。结论该方法简便、可靠、重复性好,可为泽泻的质量控制及评价提供科学依据。
