Related compounds
Mobile phase, System suitability solution, Standard solution, and Diluted standard solution
Proceed as directed in the test for 
Related compounds under 
Vinorelbine Tartrate. 
 
Chromatographic system
Proceed as directed in the Assay.
Test solution
Dilute a portion of Injection with Mobile phase to obtain a solution containing 1.0 mg of vinorelbine per mL. 
Procedure
Proceed as directed for 
Procedure in the test for 
Related compounds under 
Vinorelbine Tartrate. Not more than 1.0% of the photodegradation product is found; not more than 0.3% of vinorelbine related compound A is found; not more than 0.2% of any other individual impurity is found; and the sum of all impurities, excluding any peaks that are below the limit of quantitation (0.02%), is not more than 2.0%.
 
 
Assay
Phosphate buffer, Mobile phase, and System suitability solution
Proceed as directed in the test for 
Related compounds under 
Vinorelbine Tartrate.
 
Standard preparation
Dissolve an accurately weighed quantity of 
USP Vinorelbine Tartrate RS in water to obtain a solution having a known concentration of about 0.10 mg of vinorelbine (base) per mL.
 
Assay preparation
Transfer an accurately measured volume of Injection, equivalent to about 10 mg of vinorelbine, to a 100-mL volumetric flask, dilute with water to volume, and mix.
Chromatographic system (see Chromatography 
621
)
The liquid chromatograph is equipped with a diode-array detector and a 3.9-mm × 15-cm column that contains packing L1. The column temperature is maintained at 40

. The flow rate is about 1.0 mL per minute. Chromatograph the 
System suitability solution, and record the peak responses as directed for 
Procedure: the relative retention times are about 0.8 for the photodegradation product, 1.0 for vinorelbine, and about 1.2 for vinorelbine related compound A; and the relative retention, 

, between vinorelbine tartrate and vinorelbine related compound A is not less than 1.1.
 
Procedure
Separately inject equal volumes (about 20 µL) of the 
Standard preparation and the 
Assay preparation into the chromatograph, record the chromatograms, and measure the responses for the vinorelbine peaks, using a diode-array detector. Calculate the quantity, in mg, of vinorelbine (C
45H
54N
4O
8) in each mL of the Injection taken by the formula: 
C(L/D)(rU / rS),
in which 
C is the concentration, in mg per mL, of 
USP Vinorelbine Tartrate RS in the 
Standard preparation; L is the labeled quantity, in mg, of vinorelbine in each mL of Injection taken; 
D is the concentration, in mg per mL, of vinorelbine in the 
Assay preparation; and 
rU and 
rS are the peak responses at 267 nm obtained from the 
Assay preparation and the 
Standard preparation, respectively.