图2 迁移时间随缓冲液pH(A)及
缓冲液浓度(B)变化图
1.咖啡因 2.氢氯噻嗪 3.依那普利 8.3 马来酸依那普利在缓冲液中解离成依那普利与马来酸,图1中的峰3为依那普利的电泳峰,本文马来酸依那普利的含量以依那普利计算。 8.4 CZE内标法用于复方药物制剂的测定时,其精密度、准确度与HPLC相当,但柱效大大高于HPLC,本文中依那普利和氢氯噻嗪的理论板数分别高达180000和120000,CZE比HPLC更适于多组分样品的分析。与HPLC相比,CZE中样品液、缓冲液均消耗极少。且毛细管清洗十分简单,本文中马来酸在24.8
min时才出峰,在连续分析样品时,当两测定组分和内标流出后,即可停止电泳分离,分别用蒸馏水、缓冲液冲洗毛细管,一并除去样品中其它未流出成分,马来酸不会干扰下一次样品分析,这也是CZE优于HPLC的一个方面。
参考文献
1 Carlucci G,et
al.Simultaneous determination of enalapril maleate and hydrochlorothiazide
in tablets by derivative UV spectrophotometry and high performance
liquid chromatography.Int J Pharmaceutics,1993,93:245
2 殷国真等.高效液相色谱法测定复方马来酸依那普利片中两组分含量.药物分析杂志,1996,16(4):227
3 Ip
D P,et al.Analytical Profiles of Drug Substances.New York:Academic
Press,vol.16.1987.207
4 Deppeler
H P.Analytical Profiles of Drug Substances.New York:Academic Press,vol.10.1981.405
(本文于1997年4月25日收到) Determination
of Two Constituents in Compound Enalapril Maleate
Tablets by Capillary Zone Electrophoresis Chen Haifeng
and Wang Jie
(Shandong Institute for Drug Control,Jinan,250012) Abstract:A simultaneous determination of two constituents in enalapril
maleate compound tablets by capillary zone electrophoresis was reported.With
caffeine as internal standard and 20 m mol/L borax —20 m mol/L NaH2PO4(4.9∶5.1,pH 8.6)as running buffer,the two
constituents were separated within 7 minutes.The linear ranges of
enalapril maleate and hydrochlorothiazide were 80~640 μg/mL(r=0.9999) and 50~400 μg/mL(r=0.9993),respectively.The
average recoveries(n=5) were 101.0 % and 101.1 %,RSD were 1.0 % and 1.7 %,respectively. Key words:capillary zone electrophoresis(CZE),enalapril maleate,hydrochlorothiazide
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