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摘 要 Determination of Ofloxacin and Metronidazole in Compoud of Ofloxacin Suppository by RP-HPLC LB Jin-Sheng,LIU Zhen-Dong,FU
Ruo-Qiu ABSTRACT Aim RP-HPLC was used to determine
the content of ofloxacin and metronidazole in compound of ofloxacin
suppository.Method
The
RP-HPLC system consisted of ODS C18 column(4.6mm×250mm,5μm),methanol-water-phosphoric
acid-triethylamine(30∶70∶0.39∶0.70;pH=3.15)mixture as mobile
phase,with detection at 275nm,flow rate 0.6ml/min and column temperature
at room temperature.Results Ofloxacin had a good linearity between 3.0μg.ml-1 to 26.0μg.ml-1,the regression equation was Co=2.0271Xo+0.4880,r=0.999
9(n=5);the average recovery was 98.82%,RSD=0.78%.Metronidazole
had a good linearity between 3.0μg.ml-1 to 26.0μg.ml-1,the regression equation was CM=5.1506XM+0.0312,rM =0.999 8(n=5);the average recovery was
98.87%,RSD=2.29%.The precisions of the same day and the different
day were all ideal,RSD<3%.Conclusion This method was simple,accurate
and fast. 复方氧氟沙星栓剂为我院自制制剂,含有氧氟沙星、甲硝唑等成分,临床主要用于治疗滴虫性及细菌性阴道炎,疗效显著。由于氧氟沙星和甲硝唑紫外吸收光谱重叠,采用普通紫外吸收分光度法测定较为复杂。本文建立RP-HPLC法同时精确测定这两种成分,为本栓剂提供了含量测定方法。 1 仪器与试药 System gold高效液相色谱仪、125双流泵、166可变波长紫外检测器、System
gold数据处理机(均为美国贝克曼公司)。LG10-2.4A型离心机(北京医用离心机厂);Barnstead
D7033型纯水仪(美国出品)。 2 实验方法与结果 2.1 处方 氧氟沙星30g,甲硝唑30g,硼酸50g,冰片0.4g,明胶40g,聚乙二醇52g,吐温-80
3.7g,蒸馏水46.7g,甘油82.7g,制成重3.36g栓剂100枚。 |
Cm=3.500 5Xm+0.031
2,rm =0.999 8 n=5 表1 氧氟沙星与甲硝唑的回收率测定结果 |
样品号 |
氧氟沙星 |
甲硝唑 |
||||||||
加入量(μg) |
测得量(μg) |
回收率(%) |
±s(%) |
RSD(%) |
加入量(μg) |
测得量(μg) |
回收率(%) |
±s(%) |
RSD(%) |
|
1 |
3.045 |
2.972 |
97.59 |
|
|
3.146 |
3.045 |
96.80 |
||
2 |
6.090 |
6.055 |
99.43 |
|
|
6.292 |
6.061 |
96.33 |
||
3 |
12.180 |
12.120 |
99.51 |
98.82±0.77 |
0.78 |
12.584 |
12.799 |
101.71 |
98.87±2.26 |
2.29 |
4 |
18.270 |
18.067 |
98.89 |
|
|
18.876 |
18.774 |
99.46 |
||
5 |
24.360 |
24.041 |
98.69 |
|
|
25.168 |
25.176 |
100.03 |
表2 精密度测定结果(±s,n=4) |
组 分 |
日 内 |
日 间 |
||
测得量(μg) |
RSD(%) |
测得量(μg) |
RSD(%) |
|
氧氟沙星 |
3.020±0.068 |
2.25 |
3.060±0.072 |
2.35 |
12.121±0.200 |
1.65 |
12.162±0.182 |
1.50 |
|
24.530±0.195 |
0.80 |
24.451±0.212 |
0.87 |
|
甲硝唑 |
3.169±0.084 |
2.65 |
3.125±0.068 |
2.18 |
12.799±0.368 |
2.88 |
12.376±0.370 |
2.99 |
|
25.176±0.373 |
1.48 |
25.236±0.382 |
1.51 |
表3 复方氧氟沙星栓剂含量测定结果 |
样品批号 |
氧氟沙星 |
甲硝唑 |
||
含量(%) |
RSD(%) |
含量(%) |
RSD(%) |
|
991201 |
99.25 |
1.02 |
101.20 |
1.38 |
991204 |
98.42 |
2.05 |
100.66 |
2.99 |
991208 |
99.78 |
0.92 |
98.78 |
1.56 |
3.1 由于氧氟沙星和甲硝唑均为含氮药物,在十八烷基键合硅胶柱上,与硅胶载体上未反应硅烷醇相作用,导致峰扩张,形成拖尾。这一现象在喹诺酮类抗菌药中以氧氟沙星最为突出。本文在流动相中加入胺改性剂,憎水的胺优先被吸附在硅胶载体未反应的硅烷醇上,使氧氟沙星和甲硝唑的拖尾现象减少,从而提高了测定的选择性和准确度。但如果三乙胺的浓度太高,则造成基线不稳并使氧氟沙星、甲硝唑的保留时间延长。经本实验摸索,采用RP-HPLC法测定该栓剂,宜选用0.7%(0.05mol.L-1)的三乙胺浓度。 (本文编辑 梁爱君) 吕金胜,男,1953年11月生.高级实验师. 参考文献 [1] 张守尧,吴朝晖,张忠义,等.博泰软膏中三组分的HPLC测定[J].中国医药工业杂志,1998;29(7):315 (2000-01-11收稿 2000-01-31修回) |