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摘要 目的:建立反相高效液相色谱测定来氟米特的方法。方法:采用Hypersil ODS C18柱,流动相为甲醇-水-磷酸,检测波长为260nm,流速为1.0ml.min-1,进样量为20μl,以萘或联苯酚为内标。 结果:两峰分离完全,以萘为内标:来氟米特线性范围0.0955~7.6400μg.ml-1(r=0.9999),检测限为0.8ng,日内偏差和日间偏差分别为0.76%(n=5)和0.86%(n=5),平均回收率为99.66%(RSD=0.80%);以联苯酚为内标:来氟米特线性范围0.141~8.460μg.ml-1(r=0.9997),检测限为0.8ng,日内偏差 和日间偏差分别为0.86%(n=5)和1.06%(n=5),平均回收率为100.48%(RSD=1.60%)。 结论:方法简便,结果准确。 Determination of leflunomide by RP-HPLC Zhu Quangang (Zhu QG),Hu
Jinhong(Hu JH),Sun Huajun (Sun HJ) ABSTRACT OBJECTIVE:To establish a method
for determination of leflunomide using reversed-phase high performance liquid
chromatography.METHODS:Chromatographic conditions included Hypersil ODS C18
column and the mobile phase consisting of a mixture of methanol-water-phosphoric
acid.Detection wavelength was at 260 nm.The flow rate was 1.0 ml.min-1.Naphthalene or
p-phenylphenol was selected as the internal standard.RESULTS:When
naphthalene was used as the internal standard,the linearity between concentration and peak
area ratio was obtained from 0.0955μg.ml-1 to 7.6400μg.ml-1 (r=0.9999),the detection limit was 0.8ng,within-day and
between-day variation coefficients were 0.76% (n=5) and 0.86%(n=5),the average recovery
was 99.66% (RSD=0.80%).When p-phenylphenol was used as the internal standard,the linearity
between concentration and peak area ratio was obtained from 0.141μg.ml-1 to 8.460μg.ml-1(r=0.9997),the
detection limit was 0.8ng,within-day and between-day variation coefficients were 0.86%
(n=5) and 1.06%(n=5),the average recovery was 100.48% (RSD=1.60%).CONCLUSION:The
method was found to be simple and accurate. 来氟米特(leflunomide,简称LFM)是新型的具有抗炎及免疫抑制作用的异唑类衍生物,其作用机制不同于已知的抗炎及免疫抑制药物,对多种自身免疫性疾病有治疗作用,Ⅲ期临床试验显示治疗类风湿性关节炎效果显著,1998年由德国Hoechs Marion Roussel公司首次在美国上市[1],但其含量测定的方法未见详细报道。本实验采用的反相高效液相色谱方法,分别以萘或联苯酚为内标,定量分析来氟米特,快速准确,灵敏度高。 1 仪器和试药 高效液相色谱仪,包括Waters
Maxima 820工作站,Waters 510泵,Waters 486可变波长紫外检测器,U6K进样器(美国Waters公司);UV-2100型紫外可见分光光度计(日本岛津公司)。 2 实验方法 2.1 色谱条件 3 结 果 3.1 萘作为内标 |
图1 来氟米特和萘的HPLC图 3.2 联苯酚作为内标 |
图2 来氟米特和联苯酚的HPLC图 4 讨 论 LFM含量测定方法,国内未见报道,国外有报道采用HPLC测定[2],但都不详细。我们采用萘或联苯酚为内标,适当调整流动相的比例,两峰分离完全,无杂质干扰峰,且灵敏度高,检测限0.8ng,保留时间较理想,可以作为LFM制剂的质控方法。 *全军“九五”医学科研规划基金资助课题,项目编号98M077 参考文献 (收稿:1998-12-10) |