Mitoxantrone (DHAQ) is a new anti-cancer agent.The ion-pair HPLC method todetermine mitoxantrone hydrochoride in-jection was proposed. Mitoxantrone can beseparated on Zorbax-ODS collumn with me-thanol-water-formic acid (450:50:1.5) con-taining 3.605g SDS as mobile phase.The pHof mobile phase was adjusted to 2.7. Theflow rate was 1.0ml/min and detection wasat wavelength of 254 nm,providing a detec-tion limit of 1ng (r/n, 3:1) of DHAQ. DHAQ was determined by peak areameasurement with Ametantrone as internalst...