Summary of the invention
The objective of the invention is to provide a kind of method for detecting impurities of freeze-dried powder injection of nedaplatin to above weak point; Can prolong the retention time of active component peak in the chromatogram checking system in the freeze-dried powder injection of nedaplatin through this method; Impurity is better separated; Reduce of the influence of factors vary such as moving phase, solvent, column temperature and chromatographic column for testing result; Shorten chromatogram checking system equilibration time, improve the durability of chromatographic column, thereby in that reduce can easy, quick, stable detection Nedaplatin impurities in raw materials when detecting cost; So that control product quality effectively, avoided objectionable impurities not detect the hidden danger that to bring for patient's clinical drug safety.
The chemical name of Nedaplatin is: (Z)-diamino (glycolic acid-O1 ,-O2) platinum, structural formula is:
Molecular formula: C
2H
8N
2O
3Pt
Molecular weight: 303.18.
The present invention detects the impurity in the freeze-dried powder injection of nedaplatin through high performance liquid chromatography; Adopting octyl silane group silica gel is filling agent; Can prolong the retention time of active component peak in the chromatogram checking system in the freeze-dried powder injection of nedaplatin, impurity is better separated.
Moving phase has very big influence to separate impurities degree and peak shape in the experimental result, and in traditional colour spectral test system, the slight variation of moving phase ratio or pH value will produce very big influence for testing result, even can not be applicable to detecting of related impurities.Through inventor's research experiment, find that (volume ratio is that 60:40~99:1) is that the impurity effect of moving phase detection freeze-dried powder injection of nedaplatin is fine with water and acetonitrile or methanol mixture.Research experiment is further found; When the volume ratio of water and acetonitrile or carbinol mixture is that 70:30~99:1) is the moving phase better effects if; Adding diethylamine or triethylamine can improve the separate impurities degree and improve peak shape in moving phase, and diethylamine or the triethylamine measured with interpolation moving phase cumulative volume 0.005%~0.1% are good.Adopt such chromatographic condition; Factors vary such as moving phase, solvent, column temperature and chromatographic column are minimum for the influence of testing result; Chromatogram checking system equilibration time is shortened greatly; Improved the durability of chromatographic column simultaneously, can be easy, quick when reduce detecting cost, the impurity in the stable detection freeze-dried powder injection of nedaplatin.
The Nedaplatin stability of solution is relatively poor, adopts traditional colour spectral test system, adopts water or moving phase as solvent no matter be; Along with the prolongation impurity of standing time obviously increases, even if preservation also is so under 2~8 ℃ cryogenic conditions, in addition; Used dextran as the skeleton agent in the freeze-dried powder injection of nedaplatin, dextran is the blended polymer in the certain molecular weight scope, in chromatographic detection system, shows as a plurality of assorted peaks; And the dextran of different batches goes out the peak position and difference in size is bigger, is difficult to separate with the main peak and the impurity peaks of freeze-dried powder injection of nedaplatin, in order to guarantee the accuracy of testing result; Through inventor's research experiment; Find to adopt water of the present invention and methanol mixed solvent (volume ratio is 50:50, and with the phosphoric acid adjusting pH to 5.6 of 0.05mol/L) that the freeze-dried powder injection of nedaplatin sample ligand is processed the Nedaplatin solution of debita spissitudo, concrete is exactly to contain the solution that Nedaplatin concentration is 0.5~2mg/ml; Filter and put under 2~8 ℃ of conditions and keep in Dark Place; Since filtering be insoluble to the auxiliary material of this mixed solvent, can well eliminate skeleton agent dextran to the interference that impurity detects, significantly improved its stability simultaneously; Impurity does not have obvious increase; This provides convenience for continuous detecting of a large amount of samples, such as can adopting the auto injection liquid chromatographic system that can control sample temperature, thereby realizes a large amount of sample continuous sample introductions under the unmanned.
The method for detecting impurities of a kind of freeze-dried powder injection of nedaplatin provided by the invention, specific as follows:
1) adopt high performance liquid chromatography, its chromatographic condition is: with octyl silane group silica gel is filling agent; Moving phase is water and the acetonitrile or the methanol mixture of having added diethylamine or triethylamine; The volume ratio of water and acetonitrile or methyl alcohol is 60:40~99:1, and the addition of diethylamine or triethylamine is 0.005%~0.1% of water and acetonitrile or a carbinol mixture cumulative volume; The detection wavelength is 205~222nm; Column temperature is 20~45 ℃; Flow rate of mobile phase is 0.5~2.0ml/min;
2) preparation of sample solution: adopt water and methanol mixed solvent (volume ratio is 50:50, and regulates pH to 5.6 with the phosphoric acid of 0.05mol/L) that sample ligand is made for the solution that contains Nedaplatin 0.5~2mg/ml, filter and put under 2~8 ℃ of conditions and keep in Dark Place;
3) measure: the sample solution of 5 μ L~20 μ L is injected high performance liquid chromatograph, and the record chromatogram is also analyzed.
A kind of method for detecting impurities of freeze-dried powder injection of nedaplatin, the volume ratio of said moving phase water and acetonitrile or methyl alcohol is 70:30~99:1.
A kind of method for detecting impurities of freeze-dried powder injection of nedaplatin, said moving phase have added the diethylamine or the triethylamine of water and acetonitrile or carbinol mixture cumulative volume 0.01%~0.1%.
A kind of method for detecting impurities of freeze-dried powder injection of nedaplatin, said detection wavelength is 210~222nm.
A kind of method for detecting impurities of freeze-dried powder injection of nedaplatin, said detection wavelength is 220nm.
A kind of method for detecting impurities of freeze-dried powder injection of nedaplatin, said column temperature are 30~45 ℃.
A kind of method for detecting impurities of freeze-dried powder injection of nedaplatin, said column temperature are 40 ℃.
A kind of method for detecting impurities of freeze-dried powder injection of nedaplatin, said flow rate of mobile phase are 0.8~1.2ml/min.
A kind of method for detecting impurities of freeze-dried powder injection of nedaplatin, said flow rate of mobile phase are 1.0ml/min.
A kind of method for detecting impurities of freeze-dried powder injection of nedaplatin is made as the solution that contains Nedaplatin 1mg/ml with the freeze-dried powder injection of nedaplatin sample ligand, filters and put under 2~8 ℃ of conditions to keep in Dark Place.
The method for detecting impurities of a kind of freeze-dried powder injection of nedaplatin of the present invention; Can prolong the retention time of active component peak in the chromatogram checking system in the freeze-dried powder injection of nedaplatin through this method; Well eliminate of the interference of skeleton agent dextran to impurity is detected; Can impurity better be separated, reduce of the influence of factors vary such as moving phase, solvent, column temperature and chromatographic column, shorten chromatogram checking system equilibration time for testing result; Improve the durability of chromatographic column; Thereby can be easy, quick when reduce detecting cost, the impurity in the stable detection freeze-dried powder injection of nedaplatin, so that control product quality effectively, avoided objectionable impurities not detect the hidden danger that possibly bring for patient's clinical drug safety.
Embodiment
Further specify the present invention through embodiment below.Should correct understanding be: embodiments of the invention are only used for the present invention is described and provide, rather than limitation of the present invention, so, under method prerequisite of the present invention, simple modifications of the present invention is all belonged to the present invention and requires the scope protected.
Detecting used freeze-dried powder injection of nedaplatin sample in following examples provides by Jiangsu Aosaikang Pharmaceutical Co., Ltd, and lot number is 20080501S.
Embodiment 1:
Instrument: SHIMADZU LC-20AT high performance liquid chromatograph;
Chromatographic column: octyl silane group silicagel column (4.6 * 250mm, 5 μ m);
Moving phase:, in potpourri, add the diethylamine of potpourri cumulative volume 0.1% with water-acetonitrile (volume ratio 80:20) preparating mixture;
Column temperature: 45 ℃;
Flow velocity: 0.5ml/min;
Detect wavelength: 220nm.
The preparation of sample solution: (volume ratio is 50:50 to adopt water and methanol mixed solvent; And regulate pH to 5.6 with the phosphoric acid of 0.05mol/L) the freeze-dried powder injection of nedaplatin sample ligand is made for the solution that contains Nedaplatin 1mg/ml, filter and put under 8 ℃ of conditions and keep in Dark Place;
Measure: the sample solution of 5 μ L is injected high performance liquid chromatograph, and the record chromatogram is also analyzed, and chromatogram is seen Fig. 1.It is good that testing result shows that each item impurity separates.
Embodiment 2:
Instrument: SHIMADZU LC-20AT high performance liquid chromatograph;
Chromatographic column: octyl silane group silicagel column (4.6 * 250mm, 5 μ m);
Moving phase:, in potpourri, add the triethylamine of potpourri cumulative volume 0.005% with water-acetonitrile (volume ratio 90:10) preparating mixture;
Column temperature: 40 ℃;
Flow velocity: 1.0ml/min;
Detect wavelength: 210nm.
The preparation of sample solution: (volume ratio is 50:50 to adopt water and methanol mixed solvent; And regulate pH to 5.6 with the phosphoric acid of 0.05mol/L) the freeze-dried powder injection of nedaplatin sample ligand is made for the solution that contains Nedaplatin 0.5mg/ml, filter and put under 8 ℃ of conditions and keep in Dark Place;
Measure: the sample solution of 20 μ L is injected high performance liquid chromatograph, and the record chromatogram is also analyzed, and it is good that testing result shows that each item impurity separates.
Embodiment 3:
Instrument: SHIMADZU LC-20AT high performance liquid chromatograph;
Chromatographic column: octyl silane group silicagel column (4.6 * 250mm, 5 μ m);
Moving phase:, in potpourri, add the diethylamine of potpourri cumulative volume 0.05% with water-methanol (volume ratio 70:30) preparating mixture;
Column temperature: 30 ℃;
Flow velocity: 0.8ml/min;
Detect wavelength: 205nm.
The preparation of sample solution: (volume ratio is 50:50 to adopt water and methanol mixed solvent; And regulate pH to 5.6 with the phosphoric acid of 0.05mol/L) the freeze-dried powder injection of nedaplatin sample ligand is made for the solution that contains Nedaplatin 2mg/ml, filter and put under 2 ℃ of conditions and keep in Dark Place;
Measure: the sample solution of 5 μ L is injected high performance liquid chromatograph, and the record chromatogram is also analyzed, and it is good that testing result shows that each item impurity separates.
Embodiment 4:
Instrument: SHIMADZU LC-20AT high performance liquid chromatograph;
Chromatographic column: octyl silane group silicagel column (4.6 * 250mm, 5 μ m);
Moving phase:, in potpourri, add the triethylamine of potpourri cumulative volume 0.05% with water-acetonitrile (volume ratio 70:30) preparating mixture;
Column temperature: 45 ℃;
Flow velocity: 2.0ml/min;
Detect wavelength: 222nm.
The preparation of sample solution: (volume ratio is 50:50 to adopt water and methanol mixed solvent; And regulate pH to 5.6 with the phosphoric acid of 0.05mol/L) the freeze-dried powder injection of nedaplatin sample ligand is made for the solution that contains Nedaplatin 2mg/ml, filter and put under 8 ℃ of conditions and keep in Dark Place;
Measure: the sample solution of 5 μ L is injected high performance liquid chromatograph, and the record chromatogram is also analyzed, and it is good that testing result shows that each item impurity separates.
Embodiment 5:
Instrument: SHIMADZU LC-10AT high performance liquid chromatograph;
Chromatographic column: octyl silane group silicagel column (4.6 * 250mm, 5 μ m);
Moving phase:, in potpourri, add the triethylamine of potpourri cumulative volume 0.005% with water-methanol (volume ratio 65:35) preparating mixture;
Column temperature: 35 ℃;
Flow velocity: 1.0ml/min;
Detect wavelength: 220nm.
The preparation of sample solution: (volume ratio is 50:50 to adopt water and methanol mixed solvent; And regulate pH to 5.6 with the phosphoric acid of 0.05mol/L) the freeze-dried powder injection of nedaplatin sample ligand is made for the solution that contains Nedaplatin 1mg/ml, filter and put under 8 ℃ of conditions and keep in Dark Place;
Measure: the sample solution of 5 μ L is injected high performance liquid chromatograph, and the record chromatogram is also analyzed, and it is good that testing result shows that each item impurity separates.
Embodiment 6:
Instrument: SHIMADZU LC-10AT high performance liquid chromatograph;
Chromatographic column: octyl silane group silicagel column (4.6 * 250mm, 5 μ m);
Moving phase:, in potpourri, add the diethylamine of potpourri cumulative volume 0.005% with water-acetonitrile (volume ratio 60:40) preparating mixture;
Column temperature: 45 ℃;
Flow velocity: 1.2ml/min;
Detect wavelength: 220nm.
The preparation of sample solution: (volume ratio is 50:50 to adopt water and methanol mixed solvent; And regulate pH to 5.6 with the phosphoric acid of 0.05mol/L) the freeze-dried powder injection of nedaplatin sample ligand is made for the solution that contains Nedaplatin 1mg/ml, filter and put under 6 ℃ of conditions and keep in Dark Place;
Measure: the sample solution of 10 μ L is injected high performance liquid chromatograph, and the record chromatogram is also analyzed, and it is good that testing result shows that each item impurity separates.
Embodiment 7:
Instrument: SHIMADZU LC-20AT high performance liquid chromatograph;
Chromatographic column: octyl silane group silicagel column (4.6 * 250mm, 5 μ m);
Moving phase:, in potpourri, add the triethylamine of potpourri cumulative volume 0.1% with water-methanol (volume ratio 80:20) preparating mixture;
Column temperature: 45 ℃;
Flow velocity: 2.0ml/min;
Detect wavelength: 222nm.
The preparation of sample solution: (volume ratio is 50:50 to adopt water and methanol mixed solvent; And regulate pH to 5.6 with the phosphoric acid of 0.05mol/L) the freeze-dried powder injection of nedaplatin sample ligand is made for the solution that contains Nedaplatin 1.5mg/ml, filter and put under 4 ℃ of conditions and keep in Dark Place;
Measure: the sample solution of 10 μ L is injected high performance liquid chromatograph, and the record chromatogram is also analyzed, and it is good that testing result shows that each item impurity separates.
Embodiment 8:
Instrument: SHIMADZU LC-20AT high performance liquid chromatograph;
Chromatographic column: octyl silane group silicagel column (4.6 * 250mm, 5 μ m);
Moving phase:, in potpourri, add the diethylamine of potpourri cumulative volume 0.1% with water-methanol (volume ratio 60:40) preparating mixture;
Column temperature: 45 ℃;
Flow velocity: 1.2ml/min;
Detect wavelength: 210nm.
The preparation of sample solution: (volume ratio is 50:50 to adopt water and methanol mixed solvent; And regulate pH to 5.6 with the phosphoric acid of 0.05mol/L) the freeze-dried powder injection of nedaplatin sample ligand is made for the solution that contains Nedaplatin 2mg/ml, filter and put under 6 ℃ of conditions and keep in Dark Place;
Measure: the sample solution of 5 μ L is injected high performance liquid chromatograph, and the record chromatogram is also analyzed, and it is good that testing result shows that each item impurity separates.
Embodiment 9:
Instrument: SHIMADZU LC-20AT high performance liquid chromatograph;
Chromatographic column: octyl silane group silicagel column (4.6 * 250mm, 5 μ m);
Moving phase:, in potpourri, add the diethylamine of potpourri cumulative volume 0.01% with water-methanol (volume ratio 80:20) preparating mixture;
Column temperature: 20 ℃;
Flow velocity: 0.5ml/min;
Detect wavelength: 215nm.
The preparation of sample solution: (volume ratio is 50:50 to adopt water and methanol mixed solvent; And regulate pH to 5.6 with the phosphoric acid of 0.05mol/L) the freeze-dried powder injection of nedaplatin sample ligand is made for the solution that contains Nedaplatin 1mg/ml, filter and put under 8 ℃ of conditions and keep in Dark Place;
Measure: the sample solution of 10 μ L is injected high performance liquid chromatograph, and the record chromatogram is also analyzed, and it is good that testing result shows that each item impurity separates.
Embodiment 10:
Instrument: SHIMADZU LC-20AT high performance liquid chromatograph;
Chromatographic column: octyl silane group silicagel column (4.6 * 250mm, 5 μ m);
Moving phase:, in potpourri, add the triethylamine of potpourri cumulative volume 0.01% with water-acetonitrile (volume ratio 99:1) preparating mixture;
Column temperature: 30 ℃;
Flow velocity: 0.8ml/min;
Detect wavelength: 220nm.
The preparation of sample solution: (volume ratio is 50:50 to adopt water and methanol mixed solvent; And regulate pH to 5.6 with the phosphoric acid of 0.05mol/L) the freeze-dried powder injection of nedaplatin sample ligand is made for the solution that contains Nedaplatin 0.5mg/ml, filter and put under 8 ℃ of conditions and keep in Dark Place;
Measure: the sample solution of 5 μ L is injected high performance liquid chromatograph, and the record chromatogram is also analyzed, and it is good that testing result shows that each item impurity separates.
Embodiment 11:
Instrument: SHIMADZU LC-20AT high performance liquid chromatograph;
Chromatographic column: octyl silane group silicagel column (4.6 * 250mm, 5 μ m);
Moving phase:, in potpourri, add the diethylamine of potpourri cumulative volume 0.01% with water-acetonitrile (volume ratio 70:30) preparating mixture;
Column temperature: 45 ℃;
Flow velocity: 2.0ml/min;
Detect wavelength: 220nm.
The preparation of sample solution: (volume ratio is 50:50 to adopt water and methanol mixed solvent; And regulate pH to 5.6 with the phosphoric acid of 0.05mol/L) the freeze-dried powder injection of nedaplatin sample ligand is made for the solution that contains Nedaplatin 1mg/ml, filter and put under 4 ℃ of conditions and keep in Dark Place;
Measure: the sample solution of 5 μ L is injected high performance liquid chromatograph, and the record chromatogram is also analyzed, and it is good that testing result shows that each item impurity separates.
Embodiment 12:
Instrument: SHIMADZU LC-10AT high performance liquid chromatograph;
Chromatographic column: octyl silane group silicagel column (4.6 * 250mm, 5 μ m);
Moving phase:, in potpourri, add the triethylamine of potpourri cumulative volume 0.05% with water-methanol (volume ratio 80:20) preparating mixture;
Column temperature: 40 ℃;
Flow velocity: 2.0ml/min;
Detect wavelength: 222nm.
The preparation of sample solution: (volume ratio is 50:50 to adopt water and methanol mixed solvent; And regulate pH to 5.6 with the phosphoric acid of 0.05mol/L) the freeze-dried powder injection of nedaplatin sample ligand is made for the solution that contains Nedaplatin 0.8mg/ml, filter and put under 4 ℃ of conditions and keep in Dark Place;
Measure: the sample solution of 10 μ L is injected high performance liquid chromatograph, and the record chromatogram is also analyzed, and it is good that testing result shows that each item impurity separates.
Embodiment 13:
Instrument: SHIMADZU LC-20AT high performance liquid chromatograph;
Chromatographic column: octyl silane group silicagel column (4.6 * 250mm, 5 μ m);
Moving phase:, in potpourri, add the triethylamine of potpourri cumulative volume 0.01% with water-methanol (volume ratio 60:40) preparating mixture;
Column temperature: 25 ℃;
Flow velocity: 0.5ml/min;
Detect wavelength: 220nm.
The preparation of sample solution: (volume ratio is 50:50 to adopt water and methanol mixed solvent; And regulate pH to 5.6 with the phosphoric acid of 0.05mol/L) the freeze-dried powder injection of nedaplatin sample ligand is made for the solution that contains Nedaplatin 1mg/ml, filter and put under 6 ℃ of conditions and keep in Dark Place;
Measure: the sample solution of 20 μ L is injected high performance liquid chromatograph, and the record chromatogram is also analyzed, and it is good that testing result shows that each item impurity separates.
Embodiment 14:
Instrument: SHIMADZU LC-20AT high performance liquid chromatograph;
Chromatographic column: octyl silane group silicagel column (4.6 * 250mm, 5 μ m);
Moving phase:, in potpourri, add the diethylamine of potpourri cumulative volume 0.05% with water-acetonitrile (volume ratio 85:15) preparating mixture;
Column temperature: 20 ℃;
Flow velocity: 0.5ml/min;
Detect wavelength: 222nm.
The preparation of sample solution: (volume ratio is 50:50 to adopt water and methanol mixed solvent; And regulate pH to 5.6 with the phosphoric acid of 0.05mol/L) the freeze-dried powder injection of nedaplatin sample ligand is made for the solution that contains Nedaplatin 0.8mg/ml, filter and put under 6 ℃ of conditions and keep in Dark Place;
Measure: the sample solution of 20 μ L is injected high performance liquid chromatograph, and the record chromatogram is also analyzed, and it is good that testing result shows that each item impurity separates.
Embodiment 15:
Instrument: SHIMADZU LC-20AT high performance liquid chromatograph;
Chromatographic column: octyl silane group silicagel column (4.6 * 250mm, 5 μ m);
Moving phase:, in potpourri, add the triethylamine of potpourri cumulative volume 0.1% with water-acetonitrile (volume ratio 60:40) preparating mixture;
Column temperature: 30 ℃;
Flow velocity: 0.5ml/min;
Detect wavelength: 215nm.
The preparation of sample solution: (volume ratio is 50:50 to adopt water and methanol mixed solvent; And regulate pH to 5.6 with the phosphoric acid of 0.05mol/L) the freeze-dried powder injection of nedaplatin sample ligand is made for the solution that contains Nedaplatin 0.5mg/ml, filter and put under 8 ℃ of conditions and keep in Dark Place;
Measure: the sample solution of 20 μ L is injected high performance liquid chromatograph, and the record chromatogram is also analyzed, and it is good that testing result shows that each item impurity separates.
Embodiment 16:
Instrument: SHIMADZU LC-10AT high performance liquid chromatograph;
Chromatographic column: octyl silane group silicagel column (4.6 * 250mm, 5 μ m);
Moving phase:, in potpourri, add the diethylamine of potpourri cumulative volume 0.005% with water-methanol (volume ratio 99:1) preparating mixture;
Column temperature: 30 ℃;
Flow velocity: 1.0ml/min;
Detect wavelength: 220nm.
The preparation of sample solution: (volume ratio is 50:50 to adopt water and methanol mixed solvent; And regulate pH to 5.6 with the phosphoric acid of 0.05mol/L) the freeze-dried powder injection of nedaplatin sample ligand is made for the solution that contains Nedaplatin 1mg/ml, filter and put under 8 ℃ of conditions and keep in Dark Place;
Measure: the sample solution of 10 μ L is injected high performance liquid chromatograph, and the record chromatogram is also analyzed, and it is good that testing result shows that each item impurity separates.
Embodiment 17:
The Nedaplatin method for detecting impurities that CN200710020326.0 provides.
Instrument: SHIMADZU LC-10AT high performance liquid chromatograph;
Chromatographic column: octadecylsilane chemically bonded silica post (4.6 * 250mm, 5 μ m);
Moving phase: with methyl alcohol-0.01mol/L citric acid soln (volume ratio 30:70) (regulating pH value to 6.0 with triethylamine) is moving phase;
Column temperature: 40 ℃;
Flow velocity: 1.0ml/min;
Detect wavelength: 220nm.
The preparation of sample solution: adopt moving phase the freeze-dried powder injection of nedaplatin sample ligand to be made for the solution that contains Nedaplatin 1mg/ml;
Measure: the sample solution of 20 μ L is injected high performance liquid chromatograph; The record chromatogram is also analyzed; Find in the detection that the Nedaplatin retention time is shorter; Impurity separates undesirable, and chromatogram checking system stability is not good, and factors such as moving phase, solvent, column temperature and chromatographic column are bigger for the testing result influence.
Embodiment 18:
" 2008 1 phases of Pharmaceutical Analysis journal, 131~133 pages of methods that provide with RP-HPLC method mensuration Nedaplatin impurity.
Instrument: SHIMADZU LC-10AT high performance liquid chromatograph;
Chromatographic column: the stainless steel column of Shim-pack CLC-ODS (4.6 * 150mm, 5 μ m);
Moving phase: with methyl alcohol-0.01mol/L citric acid soln (volume ratio 30:70) (regulating pH value to 6.0 with triethylamine) is moving phase;
Column temperature: 30 ℃;
Flow velocity: 0.7ml/min;
Detect wavelength: 220nm.
The preparation of sample solution: adopt moving phase the freeze-dried powder injection of nedaplatin sample ligand to be made for the solution that contains Nedaplatin 1mg/ml;
Measure: the sample solution of 20 μ L is injected high performance liquid chromatograph, and the record chromatogram is also analyzed, and discovery Nedaplatin retention time is lacked (about 4min) in the detection; Impurity separates not ideal enough; Owing to added the citric acid of more amount, the chromatogram checking system needs long equilibration time, and balance needs 2 hours; And stability is not good, and factors such as moving phase, solvent, column temperature and chromatographic column are bigger for the testing result influence.
Embodiment 19:
The method of the mensuration Nedaplatin impurity that " Chinese Journal of Pharmaceuticals " 2000 31 10 phases 457~458 of volume provide.
Instrument: SHIMADZU LC-10AT high performance liquid chromatograph;
Chromatographic column: Spherisorb NH2 post (4.0 * 300mm, 10 μ m);
Moving phase: with 40mmol/L potassium dihydrogen phosphate-acetonitrile (volume ratio 8:2) is moving phase;
Column temperature: 30 ℃;
Flow velocity: 0.8ml/min;
Detect wavelength: 210nm.
The preparation of sample solution: adopt moving phase the freeze-dried powder injection of nedaplatin sample ligand to be made for the solution that contains Nedaplatin 20 μ g/ml;
Measure: the sample solution of 20 μ L is injected high performance liquid chromatograph, and the record chromatogram is also analyzed, though find the retention time of Nedaplatin in the detection prolongation is arranged; But Nedaplatin and related substance (being impurity) only can initial gross separations; It is less that impurity detects number, and the chromatogram checking system needs very long equilibration time, and balance needs 3 hours; This moving phase and very big to the damage of NH2 post, it is bigger to expend cost.
Embodiment 20:
Embodiment 1~embodiment 20 testing results are relatively seen table 1.
Table 1 embodiment 1~embodiment 20 testing result comparison sheets
Can find out that from table 1 technical scheme of the present invention (embodiment 1~16) is longer than prior art (embodiment 17~19) retention time, thereby is more conducive to separate impurities, detect at impurity on the stability of number and detected level and have clear superiority.Add up from the time of process of the test, technical scheme of the present invention (embodiment 1~16) is short a lot of than prior art (embodiment 17~19) chromatographic system equilibration time, more helps the fast and stable test sample.