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  • Title: High-performance liquid chromatographic analysis of neomycin in petrolatum-based ointments and in veterinary formulations.
    Author: Binns RB, Tsuji K.
    Journal: J Pharm Sci; 1984 Jan; 73(1):69-72. PubMed ID: 6694087.
    Abstract:
    A high-performance liquid chromatographic (HPLC) method has been developed for the assay of neomycin in petrolatum-based ophthalmic and topical ointments and in veterinary formulations. Neomycin assay interferences from drugs, such as bacitracin and polymyxin B and inactive components, e.g. wax, were eliminated by a methanol wash and/or a partitioning method. The extracted neomycin was derivatized with 2,4-dinitrofluorobenzene followed by normal-phase HPLC with detection at 254 nm. The average recovery of neomycin from spiked samples was approximately 100% with a relative standard deviation of less than 1%.
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