Stability of monoHER in an aqueous formulation for i.v. administration |
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Authors: | Abou El Hassan M A Touw D J Wilhelm A J Bast A van der Vijgh W J |
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Affiliation: | Department of Medical Oncology, Free University Hospital, P. O. Box 7057, 1007 MB, Amsterdam, The Netherlands. m.abulhassan@azvu.nl |
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Abstract: | MonoHER is a semisynthetic flavonoid used successfully in modulating the cardiotoxic effect of doxorubicin but not its antitumor activity. The oral bioavailability of monoHER is <1%. Therefore, it should be prepared as an i.v. formulation for use in clinical trials. The solubility of monoHER in water is highly pH dependent. At pH=8.3 the drug precipitates 4 h after preparation. DMSO was tested for enhancing the solubility of monoHER in aqueous solutions. In all DMSO-based aqueous solutions monoHER recrystalized again at pH<8.3 and room temperature within 4 h after preparation. Moreover, the stability of monoHER was lower in a DMSO stock solution than after dilution with an aqueous solution. The stability of monoHER was tested in alkaline solutions (pH 8.3 and 9.5) using an HPLC-DAD procedure to detect all possible degradation products within 10 min after injection. Minor degradation occurred to monoHER in alkaline solutions when exposed to daylight or 1% H(2)O(2). MonoHER intensively degraded when exposed to a high temperature (80 degrees C). The stability of monoHER was almost the same in saline or 5% glucose when kept at room temperature and an alkaline pH of 8.3 and 9.5. Under shelf-life conditions the stability of monoHER in 5% glucose (pH 8.4), decreased with about 10% during 48 h after preparation. |
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