Antibiotics are typically composed of various differing fractions. For example, Bleomycin has more than 12 different fractions and Gentamicin has more than 10 different fractions; G418 being one of the minor ones. Antibiotic purity has a direct and clear effect on antibiotic potency. Selecting the right antibiotic impurity profile can be very difficult and time consuming for your Active Pharmaceutical Applications DMF filing. TOKU-E has a long history of developing antibiotics as high purity Active Pharmaceutical Ingredients and can assist you in the process.