The related substances to be limited in Sertaconazole Nitrate as per BP 2010 are Impurities A,B and C along with total impurities. However, I have found no reference to Impurities A, B and C; their relative retention times are not given in the monograph and these impurities do not seem to be available any where.
How do we analyse these impurities in Sertaconazole Nitrate in absence of this information? Can some one please guide me?
Siddharth Sanghvi
